Thomas Garnier
2018-May-23 19:53 UTC
[PATCH v3 00/27] x86: PIE support and option to extend KASLR randomization
Changes:
- patch v3:
- Update on message to describe longer term PIE goal.
- Minor change on ftrace if condition.
- Changed code using xchgq.
- patch v2:
- Adapt patch to work post KPTI and compiler changes
- Redo all performance testing with latest configs and compilers
- Simplify mov macro on PIE (MOVABS now)
- Reduce GOT footprint
- patch v1:
- Simplify ftrace implementation.
- Use gcc mstack-protector-guard-reg=%gs with PIE when possible.
- rfc v3:
- Use --emit-relocs instead of -pie to reduce dynamic relocation space on
mapped memory. It also simplifies the relocation process.
- Move the start the module section next to the kernel. Remove the need for
-mcmodel=large on modules. Extends module space from 1 to 2G maximum.
- Support for XEN PVH as 32-bit relocations can be ignored with
--emit-relocs.
- Support for GOT relocations previously done automatically with -pie.
- Remove need for dynamic PLT in modules.
- Support dymamic GOT for modules.
- rfc v2:
- Add support for global stack cookie while compiler default to fs without
mcmodel=kernel
- Change patch 7 to correctly jump out of the identity mapping on kexec load
preserve.
These patches make the changes necessary to build the kernel as Position
Independent Executable (PIE) on x86_64. A PIE kernel can be relocated below
the top 2G of the virtual address space. It allows to optionally extend the
KASLR randomization range from 1G to 3G. The chosen range is the one currently
available, future changes will allow the kernel module to have a wider
randomization range.
Thanks a lot to Ard Biesheuvel & Kees Cook on their feedback on compiler
changes, PIE support and KASLR in general. Thanks to Roland McGrath on his
feedback for using -pie versus --emit-relocs and details on compiler code
generation.
The patches:
- 1-3, 5-13, 18-19: Change in assembly code to be PIE compliant.
- 4: Add a new _ASM_MOVABS macro to fetch a symbol address generically.
- 14: Adapt percpu design to work correctly when PIE is enabled.
- 15: Provide an option to default visibility to hidden except for key symbols.
It removes errors between compilation units.
- 16: Add PROVIDE_HIDDEN replacement on the linker script for weak symbols to
reduce GOT footprint.
- 17: Adapt relocation tool to handle PIE binary correctly.
- 20: Add support for global cookie.
- 21: Support ftrace with PIE (used on Ubuntu config).
- 22: Add option to move the module section just after the kernel.
- 23: Adapt module loading to support PIE with dynamic GOT.
- 24: Make the GOT read-only.
- 25: Add the CONFIG_X86_PIE option (off by default).
- 26: Adapt relocation tool to generate a 64-bit relocation table.
- 27: Add the CONFIG_RANDOMIZE_BASE_LARGE option to increase relocation range
from 1G to 3G (off by default).
Performance/Size impact:
Size of vmlinux (Default configuration):
File size:
- PIE disabled: +0.18%
- PIE enabled: -1.977% (less relocations)
.text section:
- PIE disabled: same
- PIE enabled: same
Size of vmlinux (Ubuntu configuration):
File size:
- PIE disabled: +0.21%
- PIE enabled: +10%
.text section:
- PIE disabled: same
- PIE enabled: +0.001%
The size increase is mainly due to not having access to the 32-bit signed
relocation that can be used with mcmodel=kernel. A small part is due to reduced
optimization for PIE code. This bug [1] was opened with gcc to provide a better
code generation for kernel PIE.
Hackbench (50% and 1600% on thread/process for pipe/sockets):
- PIE disabled: no significant change (avg -/+ 0.5% on latest test).
- PIE enabled: between -1% to +1% in average (default and Ubuntu config).
Kernbench (average of 10 Half and Optimal runs):
Elapsed Time:
- PIE disabled: no significant change (avg -0.5%)
- PIE enabled: average -0.5% to +0.5%
System Time:
- PIE disabled: no significant change (avg -0.1%)
- PIE enabled: average -0.4% to +0.4%.
[1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82303
diffstat:
Documentation/x86/x86_64/mm.txt | 3
arch/x86/Kconfig | 45 ++++++
arch/x86/Makefile | 58 ++++++++
arch/x86/boot/boot.h | 2
arch/x86/boot/compressed/Makefile | 5
arch/x86/boot/compressed/misc.c | 10 +
arch/x86/crypto/aes-x86_64-asm_64.S | 45 ++++--
arch/x86/crypto/aesni-intel_asm.S | 8 -
arch/x86/crypto/aesni-intel_avx-x86_64.S | 6
arch/x86/crypto/camellia-aesni-avx-asm_64.S | 42 +++---
arch/x86/crypto/camellia-aesni-avx2-asm_64.S | 44 +++---
arch/x86/crypto/camellia-x86_64-asm_64.S | 8 -
arch/x86/crypto/cast5-avx-x86_64-asm_64.S | 50 ++++---
arch/x86/crypto/cast6-avx-x86_64-asm_64.S | 44 +++---
arch/x86/crypto/des3_ede-asm_64.S | 96 +++++++++-----
arch/x86/crypto/ghash-clmulni-intel_asm.S | 4
arch/x86/crypto/glue_helper-asm-avx.S | 4
arch/x86/crypto/glue_helper-asm-avx2.S | 6
arch/x86/crypto/sha256-avx2-asm.S | 23 ++-
arch/x86/entry/calling.h | 2
arch/x86/entry/entry_32.S | 3
arch/x86/entry/entry_64.S | 25 ++-
arch/x86/include/asm/asm.h | 1
arch/x86/include/asm/bug.h | 2
arch/x86/include/asm/ftrace.h | 6
arch/x86/include/asm/jump_label.h | 8 -
arch/x86/include/asm/kvm_host.h | 8 -
arch/x86/include/asm/module.h | 11 +
arch/x86/include/asm/page_64_types.h | 9 +
arch/x86/include/asm/paravirt_types.h | 12 +
arch/x86/include/asm/percpu.h | 25 ++-
arch/x86/include/asm/pgtable_64_types.h | 6
arch/x86/include/asm/pm-trace.h | 2
arch/x86/include/asm/processor.h | 16 +-
arch/x86/include/asm/sections.h | 8 +
arch/x86/include/asm/setup.h | 2
arch/x86/include/asm/stackprotector.h | 19 ++
arch/x86/kernel/Makefile | 6
arch/x86/kernel/acpi/wakeup_64.S | 31 ++--
arch/x86/kernel/asm-offsets.c | 3
arch/x86/kernel/asm-offsets_32.c | 3
arch/x86/kernel/asm-offsets_64.c | 3
arch/x86/kernel/cpu/common.c | 3
arch/x86/kernel/cpu/microcode/core.c | 4
arch/x86/kernel/ftrace.c | 42 +++++-
arch/x86/kernel/head64.c | 23 ++-
arch/x86/kernel/head_32.S | 3
arch/x86/kernel/head_64.S | 41 +++++-
arch/x86/kernel/kvm.c | 6
arch/x86/kernel/module.c | 181 ++++++++++++++++++++++++++-
arch/x86/kernel/module.lds | 3
arch/x86/kernel/process.c | 5
arch/x86/kernel/relocate_kernel_64.S | 16 +-
arch/x86/kernel/setup_percpu.c | 5
arch/x86/kernel/vmlinux.lds.S | 13 +
arch/x86/kvm/svm.c | 4
arch/x86/lib/cmpxchg16b_emu.S | 8 -
arch/x86/mm/dump_pagetables.c | 3
arch/x86/power/hibernate_asm_64.S | 4
arch/x86/tools/relocs.c | 169 +++++++++++++++++++++++--
arch/x86/tools/relocs.h | 4
arch/x86/tools/relocs_common.c | 15 +-
arch/x86/xen/xen-asm.S | 12 -
arch/x86/xen/xen-head.S | 11 -
arch/x86/xen/xen-pvh.S | 13 +
drivers/base/firmware_loader/main.c | 4
include/asm-generic/sections.h | 6
include/asm-generic/vmlinux.lds.h | 12 +
include/linux/compiler.h | 7 +
init/Kconfig | 16 ++
kernel/kallsyms.c | 16 +-
kernel/trace/trace.h | 4
lib/dynamic_debug.c | 4
scripts/link-vmlinux.sh | 14 ++
74 files changed, 1070 insertions(+), 315 deletions(-)
Thomas Garnier
2018-May-23 19:53 UTC
[PATCH v3 01/27] x86/crypto: Adapt assembly for PIE support
Change the assembly code to use only relative references of symbols for the kernel to be PIE compatible. Position Independent Executable (PIE) support will allow to extended the KASLR randomization range below the -2G memory limit. Signed-off-by: Thomas Garnier <thgarnie at google.com> --- arch/x86/crypto/aes-x86_64-asm_64.S | 45 +++++---- arch/x86/crypto/aesni-intel_asm.S | 8 +- arch/x86/crypto/aesni-intel_avx-x86_64.S | 6 +- arch/x86/crypto/camellia-aesni-avx-asm_64.S | 42 ++++----- arch/x86/crypto/camellia-aesni-avx2-asm_64.S | 44 ++++----- arch/x86/crypto/camellia-x86_64-asm_64.S | 8 +- arch/x86/crypto/cast5-avx-x86_64-asm_64.S | 50 +++++----- arch/x86/crypto/cast6-avx-x86_64-asm_64.S | 44 +++++---- arch/x86/crypto/des3_ede-asm_64.S | 96 +++++++++++++------- arch/x86/crypto/ghash-clmulni-intel_asm.S | 4 +- arch/x86/crypto/glue_helper-asm-avx.S | 4 +- arch/x86/crypto/glue_helper-asm-avx2.S | 6 +- arch/x86/crypto/sha256-avx2-asm.S | 23 +++-- 13 files changed, 221 insertions(+), 159 deletions(-) diff --git a/arch/x86/crypto/aes-x86_64-asm_64.S b/arch/x86/crypto/aes-x86_64-asm_64.S index 8739cf7795de..86fa068e5e81 100644 --- a/arch/x86/crypto/aes-x86_64-asm_64.S +++ b/arch/x86/crypto/aes-x86_64-asm_64.S @@ -48,8 +48,12 @@ #define R10 %r10 #define R11 %r11 +/* Hold global for PIE suport */ +#define RBASE %r12 + #define prologue(FUNC,KEY,B128,B192,r1,r2,r5,r6,r7,r8,r9,r10,r11) \ ENTRY(FUNC); \ + pushq RBASE; \ movq r1,r2; \ leaq KEY+48(r8),r9; \ movq r10,r11; \ @@ -74,54 +78,63 @@ movl r6 ## E,4(r9); \ movl r7 ## E,8(r9); \ movl r8 ## E,12(r9); \ + popq RBASE; \ ret; \ ENDPROC(FUNC); +#define round_mov(tab_off, reg_i, reg_o) \ + leaq tab_off(%rip), RBASE; \ + movl (RBASE,reg_i,4), reg_o; + +#define round_xor(tab_off, reg_i, reg_o) \ + leaq tab_off(%rip), RBASE; \ + xorl (RBASE,reg_i,4), reg_o; + #define round(TAB,OFFSET,r1,r2,r3,r4,r5,r6,r7,r8,ra,rb,rc,rd) \ movzbl r2 ## H,r5 ## E; \ movzbl r2 ## L,r6 ## E; \ - movl TAB+1024(,r5,4),r5 ## E;\ + round_mov(TAB+1024, r5, r5 ## E)\ movw r4 ## X,r2 ## X; \ - movl TAB(,r6,4),r6 ## E; \ + round_mov(TAB, r6, r6 ## E) \ roll $16,r2 ## E; \ shrl $16,r4 ## E; \ movzbl r4 ## L,r7 ## E; \ movzbl r4 ## H,r4 ## E; \ xorl OFFSET(r8),ra ## E; \ xorl OFFSET+4(r8),rb ## E; \ - xorl TAB+3072(,r4,4),r5 ## E;\ - xorl TAB+2048(,r7,4),r6 ## E;\ + round_xor(TAB+3072, r4, r5 ## E)\ + round_xor(TAB+2048, r7, r6 ## E)\ movzbl r1 ## L,r7 ## E; \ movzbl r1 ## H,r4 ## E; \ - movl TAB+1024(,r4,4),r4 ## E;\ + round_mov(TAB+1024, r4, r4 ## E)\ movw r3 ## X,r1 ## X; \ roll $16,r1 ## E; \ shrl $16,r3 ## E; \ - xorl TAB(,r7,4),r5 ## E; \ + round_xor(TAB, r7, r5 ## E) \ movzbl r3 ## L,r7 ## E; \ movzbl r3 ## H,r3 ## E; \ - xorl TAB+3072(,r3,4),r4 ## E;\ - xorl TAB+2048(,r7,4),r5 ## E;\ + round_xor(TAB+3072, r3, r4 ## E)\ + round_xor(TAB+2048, r7, r5 ## E)\ movzbl r1 ## L,r7 ## E; \ movzbl r1 ## H,r3 ## E; \ shrl $16,r1 ## E; \ - xorl TAB+3072(,r3,4),r6 ## E;\ - movl TAB+2048(,r7,4),r3 ## E;\ + round_xor(TAB+3072, r3, r6 ## E)\ + round_mov(TAB+2048, r7, r3 ## E)\ movzbl r1 ## L,r7 ## E; \ movzbl r1 ## H,r1 ## E; \ - xorl TAB+1024(,r1,4),r6 ## E;\ - xorl TAB(,r7,4),r3 ## E; \ + round_xor(TAB+1024, r1, r6 ## E)\ + round_xor(TAB, r7, r3 ## E) \ movzbl r2 ## H,r1 ## E; \ movzbl r2 ## L,r7 ## E; \ shrl $16,r2 ## E; \ - xorl TAB+3072(,r1,4),r3 ## E;\ - xorl TAB+2048(,r7,4),r4 ## E;\ + round_xor(TAB+3072, r1, r3 ## E)\ + round_xor(TAB+2048, r7, r4 ## E)\ movzbl r2 ## H,r1 ## E; \ movzbl r2 ## L,r2 ## E; \ xorl OFFSET+8(r8),rc ## E; \ xorl OFFSET+12(r8),rd ## E; \ - xorl TAB+1024(,r1,4),r3 ## E;\ - xorl TAB(,r2,4),r4 ## E; + round_xor(TAB+1024, r1, r3 ## E)\ + round_xor(TAB, r2, r4 ## E) #define move_regs(r1,r2,r3,r4) \ movl r3 ## E,r1 ## E; \ diff --git a/arch/x86/crypto/aesni-intel_asm.S b/arch/x86/crypto/aesni-intel_asm.S index e762ef417562..4df029aa5fc1 100644 --- a/arch/x86/crypto/aesni-intel_asm.S +++ b/arch/x86/crypto/aesni-intel_asm.S @@ -2610,7 +2610,7 @@ ENDPROC(aesni_cbc_dec) */ .align 4 _aesni_inc_init: - movaps .Lbswap_mask, BSWAP_MASK + movaps .Lbswap_mask(%rip), BSWAP_MASK movaps IV, CTR PSHUFB_XMM BSWAP_MASK CTR mov $1, TCTR_LOW @@ -2738,12 +2738,12 @@ ENTRY(aesni_xts_crypt8) cmpb $0, %cl movl $0, %ecx movl $240, %r10d - leaq _aesni_enc4, %r11 - leaq _aesni_dec4, %rax + leaq _aesni_enc4(%rip), %r11 + leaq _aesni_dec4(%rip), %rax cmovel %r10d, %ecx cmoveq %rax, %r11 - movdqa .Lgf128mul_x_ble_mask, GF128MUL_MASK + movdqa .Lgf128mul_x_ble_mask(%rip), GF128MUL_MASK movups (IVP), IV mov 480(KEYP), KLEN diff --git a/arch/x86/crypto/aesni-intel_avx-x86_64.S b/arch/x86/crypto/aesni-intel_avx-x86_64.S index faecb1518bf8..488605b19fe8 100644 --- a/arch/x86/crypto/aesni-intel_avx-x86_64.S +++ b/arch/x86/crypto/aesni-intel_avx-x86_64.S @@ -454,7 +454,8 @@ _get_AAD_rest0\@: vpshufb and an array of shuffle masks */ movq %r12, %r11 salq $4, %r11 - movdqu aad_shift_arr(%r11), \T1 + leaq aad_shift_arr(%rip), %rax + movdqu (%rax,%r11,), \T1 vpshufb \T1, reg_i, reg_i _get_AAD_rest_final\@: vpshufb SHUF_MASK(%rip), reg_i, reg_i @@ -1761,7 +1762,8 @@ _get_AAD_rest0\@: vpshufb and an array of shuffle masks */ movq %r12, %r11 salq $4, %r11 - movdqu aad_shift_arr(%r11), \T1 + leaq aad_shift_arr(%rip), %rax + movdqu (%rax,%r11,), \T1 vpshufb \T1, reg_i, reg_i _get_AAD_rest_final\@: vpshufb SHUF_MASK(%rip), reg_i, reg_i diff --git a/arch/x86/crypto/camellia-aesni-avx-asm_64.S b/arch/x86/crypto/camellia-aesni-avx-asm_64.S index a14af6eb09cb..f94ec9a5552b 100644 --- a/arch/x86/crypto/camellia-aesni-avx-asm_64.S +++ b/arch/x86/crypto/camellia-aesni-avx-asm_64.S @@ -53,10 +53,10 @@ /* \ * S-function with AES subbytes \ */ \ - vmovdqa .Linv_shift_row, t4; \ - vbroadcastss .L0f0f0f0f, t7; \ - vmovdqa .Lpre_tf_lo_s1, t0; \ - vmovdqa .Lpre_tf_hi_s1, t1; \ + vmovdqa .Linv_shift_row(%rip), t4; \ + vbroadcastss .L0f0f0f0f(%rip), t7; \ + vmovdqa .Lpre_tf_lo_s1(%rip), t0; \ + vmovdqa .Lpre_tf_hi_s1(%rip), t1; \ \ /* AES inverse shift rows */ \ vpshufb t4, x0, x0; \ @@ -69,8 +69,8 @@ vpshufb t4, x6, x6; \ \ /* prefilter sboxes 1, 2 and 3 */ \ - vmovdqa .Lpre_tf_lo_s4, t2; \ - vmovdqa .Lpre_tf_hi_s4, t3; \ + vmovdqa .Lpre_tf_lo_s4(%rip), t2; \ + vmovdqa .Lpre_tf_hi_s4(%rip), t3; \ filter_8bit(x0, t0, t1, t7, t6); \ filter_8bit(x7, t0, t1, t7, t6); \ filter_8bit(x1, t0, t1, t7, t6); \ @@ -84,8 +84,8 @@ filter_8bit(x6, t2, t3, t7, t6); \ \ /* AES subbytes + AES shift rows */ \ - vmovdqa .Lpost_tf_lo_s1, t0; \ - vmovdqa .Lpost_tf_hi_s1, t1; \ + vmovdqa .Lpost_tf_lo_s1(%rip), t0; \ + vmovdqa .Lpost_tf_hi_s1(%rip), t1; \ vaesenclast t4, x0, x0; \ vaesenclast t4, x7, x7; \ vaesenclast t4, x1, x1; \ @@ -96,16 +96,16 @@ vaesenclast t4, x6, x6; \ \ /* postfilter sboxes 1 and 4 */ \ - vmovdqa .Lpost_tf_lo_s3, t2; \ - vmovdqa .Lpost_tf_hi_s3, t3; \ + vmovdqa .Lpost_tf_lo_s3(%rip), t2; \ + vmovdqa .Lpost_tf_hi_s3(%rip), t3; \ filter_8bit(x0, t0, t1, t7, t6); \ filter_8bit(x7, t0, t1, t7, t6); \ filter_8bit(x3, t0, t1, t7, t6); \ filter_8bit(x6, t0, t1, t7, t6); \ \ /* postfilter sbox 3 */ \ - vmovdqa .Lpost_tf_lo_s2, t4; \ - vmovdqa .Lpost_tf_hi_s2, t5; \ + vmovdqa .Lpost_tf_lo_s2(%rip), t4; \ + vmovdqa .Lpost_tf_hi_s2(%rip), t5; \ filter_8bit(x2, t2, t3, t7, t6); \ filter_8bit(x5, t2, t3, t7, t6); \ \ @@ -444,7 +444,7 @@ ENDPROC(roundsm16_x4_x5_x6_x7_x0_x1_x2_x3_y4_y5_y6_y7_y0_y1_y2_y3_ab) transpose_4x4(c0, c1, c2, c3, a0, a1); \ transpose_4x4(d0, d1, d2, d3, a0, a1); \ \ - vmovdqu .Lshufb_16x16b, a0; \ + vmovdqu .Lshufb_16x16b(%rip), a0; \ vmovdqu st1, a1; \ vpshufb a0, a2, a2; \ vpshufb a0, a3, a3; \ @@ -483,7 +483,7 @@ ENDPROC(roundsm16_x4_x5_x6_x7_x0_x1_x2_x3_y4_y5_y6_y7_y0_y1_y2_y3_ab) #define inpack16_pre(x0, x1, x2, x3, x4, x5, x6, x7, y0, y1, y2, y3, y4, y5, \ y6, y7, rio, key) \ vmovq key, x0; \ - vpshufb .Lpack_bswap, x0, x0; \ + vpshufb .Lpack_bswap(%rip), x0, x0; \ \ vpxor 0 * 16(rio), x0, y7; \ vpxor 1 * 16(rio), x0, y6; \ @@ -534,7 +534,7 @@ ENDPROC(roundsm16_x4_x5_x6_x7_x0_x1_x2_x3_y4_y5_y6_y7_y0_y1_y2_y3_ab) vmovdqu x0, stack_tmp0; \ \ vmovq key, x0; \ - vpshufb .Lpack_bswap, x0, x0; \ + vpshufb .Lpack_bswap(%rip), x0, x0; \ \ vpxor x0, y7, y7; \ vpxor x0, y6, y6; \ @@ -1017,7 +1017,7 @@ ENTRY(camellia_ctr_16way) subq $(16 * 16), %rsp; movq %rsp, %rax; - vmovdqa .Lbswap128_mask, %xmm14; + vmovdqa .Lbswap128_mask(%rip), %xmm14; /* load IV and byteswap */ vmovdqu (%rcx), %xmm0; @@ -1066,7 +1066,7 @@ ENTRY(camellia_ctr_16way) /* inpack16_pre: */ vmovq (key_table)(CTX), %xmm15; - vpshufb .Lpack_bswap, %xmm15, %xmm15; + vpshufb .Lpack_bswap(%rip), %xmm15, %xmm15; vpxor %xmm0, %xmm15, %xmm0; vpxor %xmm1, %xmm15, %xmm1; vpxor %xmm2, %xmm15, %xmm2; @@ -1134,7 +1134,7 @@ camellia_xts_crypt_16way: subq $(16 * 16), %rsp; movq %rsp, %rax; - vmovdqa .Lxts_gf128mul_and_shl1_mask, %xmm14; + vmovdqa .Lxts_gf128mul_and_shl1_mask(%rip), %xmm14; /* load IV */ vmovdqu (%rcx), %xmm0; @@ -1210,7 +1210,7 @@ camellia_xts_crypt_16way: /* inpack16_pre: */ vmovq (key_table)(CTX, %r8, 8), %xmm15; - vpshufb .Lpack_bswap, %xmm15, %xmm15; + vpshufb .Lpack_bswap(%rip), %xmm15, %xmm15; vpxor 0 * 16(%rax), %xmm15, %xmm0; vpxor %xmm1, %xmm15, %xmm1; vpxor %xmm2, %xmm15, %xmm2; @@ -1265,7 +1265,7 @@ ENTRY(camellia_xts_enc_16way) */ xorl %r8d, %r8d; /* input whitening key, 0 for enc */ - leaq __camellia_enc_blk16, %r9; + leaq __camellia_enc_blk16(%rip), %r9; jmp camellia_xts_crypt_16way; ENDPROC(camellia_xts_enc_16way) @@ -1283,7 +1283,7 @@ ENTRY(camellia_xts_dec_16way) movl $24, %eax; cmovel %eax, %r8d; /* input whitening key, last for dec */ - leaq __camellia_dec_blk16, %r9; + leaq __camellia_dec_blk16(%rip), %r9; jmp camellia_xts_crypt_16way; ENDPROC(camellia_xts_dec_16way) diff --git a/arch/x86/crypto/camellia-aesni-avx2-asm_64.S b/arch/x86/crypto/camellia-aesni-avx2-asm_64.S index b66bbfa62f50..11bbaa1cd4a7 100644 --- a/arch/x86/crypto/camellia-aesni-avx2-asm_64.S +++ b/arch/x86/crypto/camellia-aesni-avx2-asm_64.S @@ -70,12 +70,12 @@ /* \ * S-function with AES subbytes \ */ \ - vbroadcasti128 .Linv_shift_row, t4; \ - vpbroadcastd .L0f0f0f0f, t7; \ - vbroadcasti128 .Lpre_tf_lo_s1, t5; \ - vbroadcasti128 .Lpre_tf_hi_s1, t6; \ - vbroadcasti128 .Lpre_tf_lo_s4, t2; \ - vbroadcasti128 .Lpre_tf_hi_s4, t3; \ + vbroadcasti128 .Linv_shift_row(%rip), t4; \ + vpbroadcastd .L0f0f0f0f(%rip), t7; \ + vbroadcasti128 .Lpre_tf_lo_s1(%rip), t5; \ + vbroadcasti128 .Lpre_tf_hi_s1(%rip), t6; \ + vbroadcasti128 .Lpre_tf_lo_s4(%rip), t2; \ + vbroadcasti128 .Lpre_tf_hi_s4(%rip), t3; \ \ /* AES inverse shift rows */ \ vpshufb t4, x0, x0; \ @@ -121,8 +121,8 @@ vinserti128 $1, t2##_x, x6, x6; \ vextracti128 $1, x1, t3##_x; \ vextracti128 $1, x4, t2##_x; \ - vbroadcasti128 .Lpost_tf_lo_s1, t0; \ - vbroadcasti128 .Lpost_tf_hi_s1, t1; \ + vbroadcasti128 .Lpost_tf_lo_s1(%rip), t0; \ + vbroadcasti128 .Lpost_tf_hi_s1(%rip), t1; \ vaesenclast t4##_x, x2##_x, x2##_x; \ vaesenclast t4##_x, t6##_x, t6##_x; \ vinserti128 $1, t6##_x, x2, x2; \ @@ -137,16 +137,16 @@ vinserti128 $1, t2##_x, x4, x4; \ \ /* postfilter sboxes 1 and 4 */ \ - vbroadcasti128 .Lpost_tf_lo_s3, t2; \ - vbroadcasti128 .Lpost_tf_hi_s3, t3; \ + vbroadcasti128 .Lpost_tf_lo_s3(%rip), t2; \ + vbroadcasti128 .Lpost_tf_hi_s3(%rip), t3; \ filter_8bit(x0, t0, t1, t7, t6); \ filter_8bit(x7, t0, t1, t7, t6); \ filter_8bit(x3, t0, t1, t7, t6); \ filter_8bit(x6, t0, t1, t7, t6); \ \ /* postfilter sbox 3 */ \ - vbroadcasti128 .Lpost_tf_lo_s2, t4; \ - vbroadcasti128 .Lpost_tf_hi_s2, t5; \ + vbroadcasti128 .Lpost_tf_lo_s2(%rip), t4; \ + vbroadcasti128 .Lpost_tf_hi_s2(%rip), t5; \ filter_8bit(x2, t2, t3, t7, t6); \ filter_8bit(x5, t2, t3, t7, t6); \ \ @@ -483,7 +483,7 @@ ENDPROC(roundsm32_x4_x5_x6_x7_x0_x1_x2_x3_y4_y5_y6_y7_y0_y1_y2_y3_ab) transpose_4x4(c0, c1, c2, c3, a0, a1); \ transpose_4x4(d0, d1, d2, d3, a0, a1); \ \ - vbroadcasti128 .Lshufb_16x16b, a0; \ + vbroadcasti128 .Lshufb_16x16b(%rip), a0; \ vmovdqu st1, a1; \ vpshufb a0, a2, a2; \ vpshufb a0, a3, a3; \ @@ -522,7 +522,7 @@ ENDPROC(roundsm32_x4_x5_x6_x7_x0_x1_x2_x3_y4_y5_y6_y7_y0_y1_y2_y3_ab) #define inpack32_pre(x0, x1, x2, x3, x4, x5, x6, x7, y0, y1, y2, y3, y4, y5, \ y6, y7, rio, key) \ vpbroadcastq key, x0; \ - vpshufb .Lpack_bswap, x0, x0; \ + vpshufb .Lpack_bswap(%rip), x0, x0; \ \ vpxor 0 * 32(rio), x0, y7; \ vpxor 1 * 32(rio), x0, y6; \ @@ -573,7 +573,7 @@ ENDPROC(roundsm32_x4_x5_x6_x7_x0_x1_x2_x3_y4_y5_y6_y7_y0_y1_y2_y3_ab) vmovdqu x0, stack_tmp0; \ \ vpbroadcastq key, x0; \ - vpshufb .Lpack_bswap, x0, x0; \ + vpshufb .Lpack_bswap(%rip), x0, x0; \ \ vpxor x0, y7, y7; \ vpxor x0, y6, y6; \ @@ -1113,7 +1113,7 @@ ENTRY(camellia_ctr_32way) vmovdqu (%rcx), %xmm0; vmovdqa %xmm0, %xmm1; inc_le128(%xmm0, %xmm15, %xmm14); - vbroadcasti128 .Lbswap128_mask, %ymm14; + vbroadcasti128 .Lbswap128_mask(%rip), %ymm14; vinserti128 $1, %xmm0, %ymm1, %ymm0; vpshufb %ymm14, %ymm0, %ymm13; vmovdqu %ymm13, 15 * 32(%rax); @@ -1159,7 +1159,7 @@ ENTRY(camellia_ctr_32way) /* inpack32_pre: */ vpbroadcastq (key_table)(CTX), %ymm15; - vpshufb .Lpack_bswap, %ymm15, %ymm15; + vpshufb .Lpack_bswap(%rip), %ymm15, %ymm15; vpxor %ymm0, %ymm15, %ymm0; vpxor %ymm1, %ymm15, %ymm1; vpxor %ymm2, %ymm15, %ymm2; @@ -1243,13 +1243,13 @@ camellia_xts_crypt_32way: subq $(16 * 32), %rsp; movq %rsp, %rax; - vbroadcasti128 .Lxts_gf128mul_and_shl1_mask_0, %ymm12; + vbroadcasti128 .Lxts_gf128mul_and_shl1_mask_0(%rip), %ymm12; /* load IV and construct second IV */ vmovdqu (%rcx), %xmm0; vmovdqa %xmm0, %xmm15; gf128mul_x_ble(%xmm0, %xmm12, %xmm13); - vbroadcasti128 .Lxts_gf128mul_and_shl1_mask_1, %ymm13; + vbroadcasti128 .Lxts_gf128mul_and_shl1_mask_1(%rip), %ymm13; vinserti128 $1, %xmm0, %ymm15, %ymm0; vpxor 0 * 32(%rdx), %ymm0, %ymm15; vmovdqu %ymm15, 15 * 32(%rax); @@ -1326,7 +1326,7 @@ camellia_xts_crypt_32way: /* inpack32_pre: */ vpbroadcastq (key_table)(CTX, %r8, 8), %ymm15; - vpshufb .Lpack_bswap, %ymm15, %ymm15; + vpshufb .Lpack_bswap(%rip), %ymm15, %ymm15; vpxor 0 * 32(%rax), %ymm15, %ymm0; vpxor %ymm1, %ymm15, %ymm1; vpxor %ymm2, %ymm15, %ymm2; @@ -1384,7 +1384,7 @@ ENTRY(camellia_xts_enc_32way) xorl %r8d, %r8d; /* input whitening key, 0 for enc */ - leaq __camellia_enc_blk32, %r9; + leaq __camellia_enc_blk32(%rip), %r9; jmp camellia_xts_crypt_32way; ENDPROC(camellia_xts_enc_32way) @@ -1402,7 +1402,7 @@ ENTRY(camellia_xts_dec_32way) movl $24, %eax; cmovel %eax, %r8d; /* input whitening key, last for dec */ - leaq __camellia_dec_blk32, %r9; + leaq __camellia_dec_blk32(%rip), %r9; jmp camellia_xts_crypt_32way; ENDPROC(camellia_xts_dec_32way) diff --git a/arch/x86/crypto/camellia-x86_64-asm_64.S b/arch/x86/crypto/camellia-x86_64-asm_64.S index 95ba6956a7f6..ef1137406959 100644 --- a/arch/x86/crypto/camellia-x86_64-asm_64.S +++ b/arch/x86/crypto/camellia-x86_64-asm_64.S @@ -92,11 +92,13 @@ #define RXORbl %r9b #define xor2ror16(T0, T1, tmp1, tmp2, ab, dst) \ + leaq T0(%rip), tmp1; \ movzbl ab ## bl, tmp2 ## d; \ + xorq (tmp1, tmp2, 8), dst; \ + leaq T1(%rip), tmp2; \ movzbl ab ## bh, tmp1 ## d; \ - rorq $16, ab; \ - xorq T0(, tmp2, 8), dst; \ - xorq T1(, tmp1, 8), dst; + xorq (tmp2, tmp1, 8), dst; \ + rorq $16, ab; /********************************************************************** 1-way camellia diff --git a/arch/x86/crypto/cast5-avx-x86_64-asm_64.S b/arch/x86/crypto/cast5-avx-x86_64-asm_64.S index 86107c961bb4..64eb5c87d04a 100644 --- a/arch/x86/crypto/cast5-avx-x86_64-asm_64.S +++ b/arch/x86/crypto/cast5-avx-x86_64-asm_64.S @@ -98,16 +98,20 @@ #define lookup_32bit(src, dst, op1, op2, op3, interleave_op, il_reg) \ - movzbl src ## bh, RID1d; \ - movzbl src ## bl, RID2d; \ - shrq $16, src; \ - movl s1(, RID1, 4), dst ## d; \ - op1 s2(, RID2, 4), dst ## d; \ - movzbl src ## bh, RID1d; \ - movzbl src ## bl, RID2d; \ - interleave_op(il_reg); \ - op2 s3(, RID1, 4), dst ## d; \ - op3 s4(, RID2, 4), dst ## d; + movzbl src ## bh, RID1d; \ + leaq s1(%rip), RID2; \ + movl (RID2, RID1, 4), dst ## d; \ + movzbl src ## bl, RID2d; \ + leaq s2(%rip), RID1; \ + op1 (RID1, RID2, 4), dst ## d; \ + shrq $16, src; \ + movzbl src ## bh, RID1d; \ + leaq s3(%rip), RID2; \ + op2 (RID2, RID1, 4), dst ## d; \ + movzbl src ## bl, RID2d; \ + leaq s4(%rip), RID1; \ + op3 (RID1, RID2, 4), dst ## d; \ + interleave_op(il_reg); #define dummy(d) /* do nothing */ @@ -166,15 +170,15 @@ subround(l ## 3, r ## 3, l ## 4, r ## 4, f); #define enc_preload_rkr() \ - vbroadcastss .L16_mask, RKR; \ + vbroadcastss .L16_mask(%rip), RKR; \ /* add 16-bit rotation to key rotations (mod 32) */ \ vpxor kr(CTX), RKR, RKR; #define dec_preload_rkr() \ - vbroadcastss .L16_mask, RKR; \ + vbroadcastss .L16_mask(%rip), RKR; \ /* add 16-bit rotation to key rotations (mod 32) */ \ vpxor kr(CTX), RKR, RKR; \ - vpshufb .Lbswap128_mask, RKR, RKR; + vpshufb .Lbswap128_mask(%rip), RKR, RKR; #define transpose_2x4(x0, x1, t0, t1) \ vpunpckldq x1, x0, t0; \ @@ -251,9 +255,9 @@ __cast5_enc_blk16: movq %rdi, CTX; - vmovdqa .Lbswap_mask, RKM; - vmovd .Lfirst_mask, R1ST; - vmovd .L32_mask, R32; + vmovdqa .Lbswap_mask(%rip), RKM; + vmovd .Lfirst_mask(%rip), R1ST; + vmovd .L32_mask(%rip), R32; enc_preload_rkr(); inpack_blocks(RL1, RR1, RTMP, RX, RKM); @@ -287,7 +291,7 @@ __cast5_enc_blk16: popq %rbx; popq %r15; - vmovdqa .Lbswap_mask, RKM; + vmovdqa .Lbswap_mask(%rip), RKM; outunpack_blocks(RR1, RL1, RTMP, RX, RKM); outunpack_blocks(RR2, RL2, RTMP, RX, RKM); @@ -325,9 +329,9 @@ __cast5_dec_blk16: movq %rdi, CTX; - vmovdqa .Lbswap_mask, RKM; - vmovd .Lfirst_mask, R1ST; - vmovd .L32_mask, R32; + vmovdqa .Lbswap_mask(%rip), RKM; + vmovd .Lfirst_mask(%rip), R1ST; + vmovd .L32_mask(%rip), R32; dec_preload_rkr(); inpack_blocks(RL1, RR1, RTMP, RX, RKM); @@ -358,7 +362,7 @@ __cast5_dec_blk16: round(RL, RR, 1, 2); round(RR, RL, 0, 1); - vmovdqa .Lbswap_mask, RKM; + vmovdqa .Lbswap_mask(%rip), RKM; popq %rbx; popq %r15; @@ -521,8 +525,8 @@ ENTRY(cast5_ctr_16way) vpcmpeqd RKR, RKR, RKR; vpaddq RKR, RKR, RKR; /* low: -2, high: -2 */ - vmovdqa .Lbswap_iv_mask, R1ST; - vmovdqa .Lbswap128_mask, RKM; + vmovdqa .Lbswap_iv_mask(%rip), R1ST; + vmovdqa .Lbswap128_mask(%rip), RKM; /* load IV and byteswap */ vmovq (%rcx), RX; diff --git a/arch/x86/crypto/cast6-avx-x86_64-asm_64.S b/arch/x86/crypto/cast6-avx-x86_64-asm_64.S index 7f30b6f0d72c..da1b7e4a23e4 100644 --- a/arch/x86/crypto/cast6-avx-x86_64-asm_64.S +++ b/arch/x86/crypto/cast6-avx-x86_64-asm_64.S @@ -98,16 +98,20 @@ #define lookup_32bit(src, dst, op1, op2, op3, interleave_op, il_reg) \ - movzbl src ## bh, RID1d; \ - movzbl src ## bl, RID2d; \ - shrq $16, src; \ - movl s1(, RID1, 4), dst ## d; \ - op1 s2(, RID2, 4), dst ## d; \ - movzbl src ## bh, RID1d; \ - movzbl src ## bl, RID2d; \ - interleave_op(il_reg); \ - op2 s3(, RID1, 4), dst ## d; \ - op3 s4(, RID2, 4), dst ## d; + movzbl src ## bh, RID1d; \ + leaq s1(%rip), RID2; \ + movl (RID2, RID1, 4), dst ## d; \ + movzbl src ## bl, RID2d; \ + leaq s2(%rip), RID1; \ + op1 (RID1, RID2, 4), dst ## d; \ + shrq $16, src; \ + movzbl src ## bh, RID1d; \ + leaq s3(%rip), RID2; \ + op2 (RID2, RID1, 4), dst ## d; \ + movzbl src ## bl, RID2d; \ + leaq s4(%rip), RID1; \ + op3 (RID1, RID2, 4), dst ## d; \ + interleave_op(il_reg); #define dummy(d) /* do nothing */ @@ -190,10 +194,10 @@ qop(RD, RC, 1); #define shuffle(mask) \ - vpshufb mask, RKR, RKR; + vpshufb mask(%rip), RKR, RKR; #define preload_rkr(n, do_mask, mask) \ - vbroadcastss .L16_mask, RKR; \ + vbroadcastss .L16_mask(%rip), RKR; \ /* add 16-bit rotation to key rotations (mod 32) */ \ vpxor (kr+n*16)(CTX), RKR, RKR; \ do_mask(mask); @@ -275,9 +279,9 @@ __cast6_enc_blk8: movq %rdi, CTX; - vmovdqa .Lbswap_mask, RKM; - vmovd .Lfirst_mask, R1ST; - vmovd .L32_mask, R32; + vmovdqa .Lbswap_mask(%rip), RKM; + vmovd .Lfirst_mask(%rip), R1ST; + vmovd .L32_mask(%rip), R32; inpack_blocks(RA1, RB1, RC1, RD1, RTMP, RX, RKRF, RKM); inpack_blocks(RA2, RB2, RC2, RD2, RTMP, RX, RKRF, RKM); @@ -301,7 +305,7 @@ __cast6_enc_blk8: popq %rbx; popq %r15; - vmovdqa .Lbswap_mask, RKM; + vmovdqa .Lbswap_mask(%rip), RKM; outunpack_blocks(RA1, RB1, RC1, RD1, RTMP, RX, RKRF, RKM); outunpack_blocks(RA2, RB2, RC2, RD2, RTMP, RX, RKRF, RKM); @@ -323,9 +327,9 @@ __cast6_dec_blk8: movq %rdi, CTX; - vmovdqa .Lbswap_mask, RKM; - vmovd .Lfirst_mask, R1ST; - vmovd .L32_mask, R32; + vmovdqa .Lbswap_mask(%rip), RKM; + vmovd .Lfirst_mask(%rip), R1ST; + vmovd .L32_mask(%rip), R32; inpack_blocks(RA1, RB1, RC1, RD1, RTMP, RX, RKRF, RKM); inpack_blocks(RA2, RB2, RC2, RD2, RTMP, RX, RKRF, RKM); @@ -349,7 +353,7 @@ __cast6_dec_blk8: popq %rbx; popq %r15; - vmovdqa .Lbswap_mask, RKM; + vmovdqa .Lbswap_mask(%rip), RKM; outunpack_blocks(RA1, RB1, RC1, RD1, RTMP, RX, RKRF, RKM); outunpack_blocks(RA2, RB2, RC2, RD2, RTMP, RX, RKRF, RKM); diff --git a/arch/x86/crypto/des3_ede-asm_64.S b/arch/x86/crypto/des3_ede-asm_64.S index 8e49ce117494..4bbd3ec78df5 100644 --- a/arch/x86/crypto/des3_ede-asm_64.S +++ b/arch/x86/crypto/des3_ede-asm_64.S @@ -138,21 +138,29 @@ movzbl RW0bl, RT2d; \ movzbl RW0bh, RT3d; \ shrq $16, RW0; \ - movq s8(, RT0, 8), RT0; \ - xorq s6(, RT1, 8), to; \ + leaq s8(%rip), RW1; \ + movq (RW1, RT0, 8), RT0; \ + leaq s6(%rip), RW1; \ + xorq (RW1, RT1, 8), to; \ movzbl RW0bl, RL1d; \ movzbl RW0bh, RT1d; \ shrl $16, RW0d; \ - xorq s4(, RT2, 8), RT0; \ - xorq s2(, RT3, 8), to; \ + leaq s4(%rip), RW1; \ + xorq (RW1, RT2, 8), RT0; \ + leaq s2(%rip), RW1; \ + xorq (RW1, RT3, 8), to; \ movzbl RW0bl, RT2d; \ movzbl RW0bh, RT3d; \ - xorq s7(, RL1, 8), RT0; \ - xorq s5(, RT1, 8), to; \ - xorq s3(, RT2, 8), RT0; \ + leaq s7(%rip), RW1; \ + xorq (RW1, RL1, 8), RT0; \ + leaq s5(%rip), RW1; \ + xorq (RW1, RT1, 8), to; \ + leaq s3(%rip), RW1; \ + xorq (RW1, RT2, 8), RT0; \ load_next_key(n, RW0); \ xorq RT0, to; \ - xorq s1(, RT3, 8), to; \ + leaq s1(%rip), RW1; \ + xorq (RW1, RT3, 8), to; \ #define load_next_key(n, RWx) \ movq (((n) + 1) * 8)(CTX), RWx; @@ -364,65 +372,89 @@ ENDPROC(des3_ede_x86_64_crypt_blk) movzbl RW0bl, RT3d; \ movzbl RW0bh, RT1d; \ shrq $16, RW0; \ - xorq s8(, RT3, 8), to##0; \ - xorq s6(, RT1, 8), to##0; \ + leaq s8(%rip), RT2; \ + xorq (RT2, RT3, 8), to##0; \ + leaq s6(%rip), RT2; \ + xorq (RT2, RT1, 8), to##0; \ movzbl RW0bl, RT3d; \ movzbl RW0bh, RT1d; \ shrq $16, RW0; \ - xorq s4(, RT3, 8), to##0; \ - xorq s2(, RT1, 8), to##0; \ + leaq s4(%rip), RT2; \ + xorq (RT2, RT3, 8), to##0; \ + leaq s2(%rip), RT2; \ + xorq (RT2, RT1, 8), to##0; \ movzbl RW0bl, RT3d; \ movzbl RW0bh, RT1d; \ shrl $16, RW0d; \ - xorq s7(, RT3, 8), to##0; \ - xorq s5(, RT1, 8), to##0; \ + leaq s7(%rip), RT2; \ + xorq (RT2, RT3, 8), to##0; \ + leaq s5(%rip), RT2; \ + xorq (RT2, RT1, 8), to##0; \ movzbl RW0bl, RT3d; \ movzbl RW0bh, RT1d; \ load_next_key(n, RW0); \ - xorq s3(, RT3, 8), to##0; \ - xorq s1(, RT1, 8), to##0; \ + leaq s3(%rip), RT2; \ + xorq (RT2, RT3, 8), to##0; \ + leaq s1(%rip), RT2; \ + xorq (RT2, RT1, 8), to##0; \ xorq from##1, RW1; \ movzbl RW1bl, RT3d; \ movzbl RW1bh, RT1d; \ shrq $16, RW1; \ - xorq s8(, RT3, 8), to##1; \ - xorq s6(, RT1, 8), to##1; \ + leaq s8(%rip), RT2; \ + xorq (RT2, RT3, 8), to##1; \ + leaq s6(%rip), RT2; \ + xorq (RT2, RT1, 8), to##1; \ movzbl RW1bl, RT3d; \ movzbl RW1bh, RT1d; \ shrq $16, RW1; \ - xorq s4(, RT3, 8), to##1; \ - xorq s2(, RT1, 8), to##1; \ + leaq s4(%rip), RT2; \ + xorq (RT2, RT3, 8), to##1; \ + leaq s2(%rip), RT2; \ + xorq (RT2, RT1, 8), to##1; \ movzbl RW1bl, RT3d; \ movzbl RW1bh, RT1d; \ shrl $16, RW1d; \ - xorq s7(, RT3, 8), to##1; \ - xorq s5(, RT1, 8), to##1; \ + leaq s7(%rip), RT2; \ + xorq (RT2, RT3, 8), to##1; \ + leaq s5(%rip), RT2; \ + xorq (RT2, RT1, 8), to##1; \ movzbl RW1bl, RT3d; \ movzbl RW1bh, RT1d; \ do_movq(RW0, RW1); \ - xorq s3(, RT3, 8), to##1; \ - xorq s1(, RT1, 8), to##1; \ + leaq s3(%rip), RT2; \ + xorq (RT2, RT3, 8), to##1; \ + leaq s1(%rip), RT2; \ + xorq (RT2, RT1, 8), to##1; \ xorq from##2, RW2; \ movzbl RW2bl, RT3d; \ movzbl RW2bh, RT1d; \ shrq $16, RW2; \ - xorq s8(, RT3, 8), to##2; \ - xorq s6(, RT1, 8), to##2; \ + leaq s8(%rip), RT2; \ + xorq (RT2, RT3, 8), to##2; \ + leaq s6(%rip), RT2; \ + xorq (RT2, RT1, 8), to##2; \ movzbl RW2bl, RT3d; \ movzbl RW2bh, RT1d; \ shrq $16, RW2; \ - xorq s4(, RT3, 8), to##2; \ - xorq s2(, RT1, 8), to##2; \ + leaq s4(%rip), RT2; \ + xorq (RT2, RT3, 8), to##2; \ + leaq s2(%rip), RT2; \ + xorq (RT2, RT1, 8), to##2; \ movzbl RW2bl, RT3d; \ movzbl RW2bh, RT1d; \ shrl $16, RW2d; \ - xorq s7(, RT3, 8), to##2; \ - xorq s5(, RT1, 8), to##2; \ + leaq s7(%rip), RT2; \ + xorq (RT2, RT3, 8), to##2; \ + leaq s5(%rip), RT2; \ + xorq (RT2, RT1, 8), to##2; \ movzbl RW2bl, RT3d; \ movzbl RW2bh, RT1d; \ do_movq(RW0, RW2); \ - xorq s3(, RT3, 8), to##2; \ - xorq s1(, RT1, 8), to##2; + leaq s3(%rip), RT2; \ + xorq (RT2, RT3, 8), to##2; \ + leaq s1(%rip), RT2; \ + xorq (RT2, RT1, 8), to##2; #define __movq(src, dst) \ movq src, dst; diff --git a/arch/x86/crypto/ghash-clmulni-intel_asm.S b/arch/x86/crypto/ghash-clmulni-intel_asm.S index f94375a8dcd1..d56a281221fb 100644 --- a/arch/x86/crypto/ghash-clmulni-intel_asm.S +++ b/arch/x86/crypto/ghash-clmulni-intel_asm.S @@ -97,7 +97,7 @@ ENTRY(clmul_ghash_mul) FRAME_BEGIN movups (%rdi), DATA movups (%rsi), SHASH - movaps .Lbswap_mask, BSWAP + movaps .Lbswap_mask(%rip), BSWAP PSHUFB_XMM BSWAP DATA call __clmul_gf128mul_ble PSHUFB_XMM BSWAP DATA @@ -114,7 +114,7 @@ ENTRY(clmul_ghash_update) FRAME_BEGIN cmp $16, %rdx jb .Lupdate_just_ret # check length - movaps .Lbswap_mask, BSWAP + movaps .Lbswap_mask(%rip), BSWAP movups (%rdi), DATA movups (%rcx), SHASH PSHUFB_XMM BSWAP DATA diff --git a/arch/x86/crypto/glue_helper-asm-avx.S b/arch/x86/crypto/glue_helper-asm-avx.S index 02ee2308fb38..8a49ab1699ef 100644 --- a/arch/x86/crypto/glue_helper-asm-avx.S +++ b/arch/x86/crypto/glue_helper-asm-avx.S @@ -54,7 +54,7 @@ #define load_ctr_8way(iv, bswap, x0, x1, x2, x3, x4, x5, x6, x7, t0, t1, t2) \ vpcmpeqd t0, t0, t0; \ vpsrldq $8, t0, t0; /* low: -1, high: 0 */ \ - vmovdqa bswap, t1; \ + vmovdqa bswap(%rip), t1; \ \ /* load IV and byteswap */ \ vmovdqu (iv), x7; \ @@ -99,7 +99,7 @@ #define load_xts_8way(iv, src, dst, x0, x1, x2, x3, x4, x5, x6, x7, tiv, t0, \ t1, xts_gf128mul_and_shl1_mask) \ - vmovdqa xts_gf128mul_and_shl1_mask, t0; \ + vmovdqa xts_gf128mul_and_shl1_mask(%rip), t0; \ \ /* load IV */ \ vmovdqu (iv), tiv; \ diff --git a/arch/x86/crypto/glue_helper-asm-avx2.S b/arch/x86/crypto/glue_helper-asm-avx2.S index a53ac11dd385..e04c80467bd2 100644 --- a/arch/x86/crypto/glue_helper-asm-avx2.S +++ b/arch/x86/crypto/glue_helper-asm-avx2.S @@ -67,7 +67,7 @@ vmovdqu (iv), t2x; \ vmovdqa t2x, t3x; \ inc_le128(t2x, t0x, t1x); \ - vbroadcasti128 bswap, t1; \ + vbroadcasti128 bswap(%rip), t1; \ vinserti128 $1, t2x, t3, t2; /* ab: le0 ; cd: le1 */ \ vpshufb t1, t2, x0; \ \ @@ -124,13 +124,13 @@ tivx, t0, t0x, t1, t1x, t2, t2x, t3, \ xts_gf128mul_and_shl1_mask_0, \ xts_gf128mul_and_shl1_mask_1) \ - vbroadcasti128 xts_gf128mul_and_shl1_mask_0, t1; \ + vbroadcasti128 xts_gf128mul_and_shl1_mask_0(%rip), t1; \ \ /* load IV and construct second IV */ \ vmovdqu (iv), tivx; \ vmovdqa tivx, t0x; \ gf128mul_x_ble(tivx, t1x, t2x); \ - vbroadcasti128 xts_gf128mul_and_shl1_mask_1, t2; \ + vbroadcasti128 xts_gf128mul_and_shl1_mask_1(%rip), t2; \ vinserti128 $1, tivx, t0, tiv; \ vpxor (0*32)(src), tiv, x0; \ vmovdqu tiv, (0*32)(dst); \ diff --git a/arch/x86/crypto/sha256-avx2-asm.S b/arch/x86/crypto/sha256-avx2-asm.S index 1420db15dcdd..2ced4b2f6c76 100644 --- a/arch/x86/crypto/sha256-avx2-asm.S +++ b/arch/x86/crypto/sha256-avx2-asm.S @@ -588,37 +588,42 @@ last_block_enter: mov INP, _INP(%rsp) ## schedule 48 input dwords, by doing 3 rounds of 12 each - xor SRND, SRND + leaq K256(%rip), SRND + ## loop1 upper bound + leaq K256+3*4*32(%rip), INP .align 16 loop1: - vpaddd K256+0*32(SRND), X0, XFER + vpaddd 0*32(SRND), X0, XFER vmovdqa XFER, 0*32+_XFER(%rsp, SRND) FOUR_ROUNDS_AND_SCHED _XFER + 0*32 - vpaddd K256+1*32(SRND), X0, XFER + vpaddd 1*32(SRND), X0, XFER vmovdqa XFER, 1*32+_XFER(%rsp, SRND) FOUR_ROUNDS_AND_SCHED _XFER + 1*32 - vpaddd K256+2*32(SRND), X0, XFER + vpaddd 2*32(SRND), X0, XFER vmovdqa XFER, 2*32+_XFER(%rsp, SRND) FOUR_ROUNDS_AND_SCHED _XFER + 2*32 - vpaddd K256+3*32(SRND), X0, XFER + vpaddd 3*32(SRND), X0, XFER vmovdqa XFER, 3*32+_XFER(%rsp, SRND) FOUR_ROUNDS_AND_SCHED _XFER + 3*32 add $4*32, SRND - cmp $3*4*32, SRND + cmp INP, SRND jb loop1 + ## loop2 upper bound + leaq K256+4*4*32(%rip), INP + loop2: ## Do last 16 rounds with no scheduling - vpaddd K256+0*32(SRND), X0, XFER + vpaddd 0*32(SRND), X0, XFER vmovdqa XFER, 0*32+_XFER(%rsp, SRND) DO_4ROUNDS _XFER + 0*32 - vpaddd K256+1*32(SRND), X1, XFER + vpaddd 1*32(SRND), X1, XFER vmovdqa XFER, 1*32+_XFER(%rsp, SRND) DO_4ROUNDS _XFER + 1*32 add $2*32, SRND @@ -626,7 +631,7 @@ loop2: vmovdqa X2, X0 vmovdqa X3, X1 - cmp $4*4*32, SRND + cmp INP, SRND jb loop2 mov _CTX(%rsp), CTX -- 2.17.0.441.gb46fe60e1d-goog
Thomas Garnier
2018-May-23 19:53 UTC
[PATCH v3 02/27] x86: Use symbol name on bug table for PIE support
Replace the %c constraint with %P. The %c is incompatible with PIE
because it implies an immediate value whereas %P reference a symbol.
Position Independent Executable (PIE) support will allow to extended the
KASLR randomization range below the -2G memory limit.
Signed-off-by: Thomas Garnier <thgarnie at google.com>
---
arch/x86/include/asm/bug.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/include/asm/bug.h b/arch/x86/include/asm/bug.h
index 6804d6642767..3d690a4abf50 100644
--- a/arch/x86/include/asm/bug.h
+++ b/arch/x86/include/asm/bug.h
@@ -35,7 +35,7 @@ do { \
asm volatile("1:\t" ins "\n" \
".pushsection __bug_table,\"aw\"\n" \
"2:\t" __BUG_REL(1b) "\t# bug_entry::bug_addr\n" \
- "\t" __BUG_REL(%c0) "\t# bug_entry::file\n" \
+ "\t" __BUG_REL(%P0) "\t# bug_entry::file\n" \
"\t.word %c1" "\t# bug_entry::line\n" \
"\t.word %c2" "\t# bug_entry::flags\n" \
"\t.org 2b+%c3\n" \
--
2.17.0.441.gb46fe60e1d-goog
Thomas Garnier
2018-May-23 19:53 UTC
[PATCH v3 03/27] x86: Use symbol name in jump table for PIE support
Replace the %c constraint with %P. The %c is incompatible with PIE because it implies an immediate value whereas %P reference a symbol. Position Independent Executable (PIE) support will allow to extended the KASLR randomization range below the -2G memory limit. Signed-off-by: Thomas Garnier <thgarnie at google.com> --- arch/x86/include/asm/jump_label.h | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/arch/x86/include/asm/jump_label.h b/arch/x86/include/asm/jump_label.h index 8c0de4282659..dfdcdc39604a 100644 --- a/arch/x86/include/asm/jump_label.h +++ b/arch/x86/include/asm/jump_label.h @@ -37,9 +37,9 @@ static __always_inline bool arch_static_branch(struct static_key *key, bool bran ".byte " __stringify(STATIC_KEY_INIT_NOP) "\n\t" ".pushsection __jump_table, \"aw\" \n\t" _ASM_ALIGN "\n\t" - _ASM_PTR "1b, %l[l_yes], %c0 + %c1 \n\t" + _ASM_PTR "1b, %l[l_yes], %P0 \n\t" ".popsection \n\t" - : : "i" (key), "i" (branch) : : l_yes); + : : "X" (&((char *)key)[branch]) : : l_yes); return false; l_yes: @@ -53,9 +53,9 @@ static __always_inline bool arch_static_branch_jump(struct static_key *key, bool "2:\n\t" ".pushsection __jump_table, \"aw\" \n\t" _ASM_ALIGN "\n\t" - _ASM_PTR "1b, %l[l_yes], %c0 + %c1 \n\t" + _ASM_PTR "1b, %l[l_yes], %P0 \n\t" ".popsection \n\t" - : : "i" (key), "i" (branch) : : l_yes); + : : "X" (&((char *)key)[branch]) : : l_yes); return false; l_yes: -- 2.17.0.441.gb46fe60e1d-goog
Thomas Garnier
2018-May-23 19:53 UTC
[PATCH v3 04/27] x86: Add macro to get symbol address for PIE support
Add a new _ASM_MOVABS macro to fetch a symbol address. It will be used to replace "_ASM_MOV $<symbol>, %dst" code construct that are not compatible with PIE. Signed-off-by: Thomas Garnier <thgarnie at google.com> --- arch/x86/include/asm/asm.h | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/x86/include/asm/asm.h b/arch/x86/include/asm/asm.h index 219faaec51df..4492a35fad69 100644 --- a/arch/x86/include/asm/asm.h +++ b/arch/x86/include/asm/asm.h @@ -30,6 +30,7 @@ #define _ASM_ALIGN __ASM_SEL(.balign 4, .balign 8) #define _ASM_MOV __ASM_SIZE(mov) +#define _ASM_MOVABS __ASM_SEL(movl, movabsq) #define _ASM_INC __ASM_SIZE(inc) #define _ASM_DEC __ASM_SIZE(dec) #define _ASM_ADD __ASM_SIZE(add) -- 2.17.0.441.gb46fe60e1d-goog
Thomas Garnier
2018-May-23 19:53 UTC
[PATCH v3 05/27] x86: relocate_kernel - Adapt assembly for PIE support
Change the assembly code to use only relative references of symbols for the kernel to be PIE compatible. Position Independent Executable (PIE) support will allow to extended the KASLR randomization range below the -2G memory limit. Signed-off-by: Thomas Garnier <thgarnie at google.com> --- arch/x86/kernel/relocate_kernel_64.S | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/arch/x86/kernel/relocate_kernel_64.S b/arch/x86/kernel/relocate_kernel_64.S index 11eda21eb697..a7227dfe1a2b 100644 --- a/arch/x86/kernel/relocate_kernel_64.S +++ b/arch/x86/kernel/relocate_kernel_64.S @@ -208,9 +208,11 @@ identity_mapped: movq %rax, %cr3 lea PAGE_SIZE(%r8), %rsp call swap_pages - movq $virtual_mapped, %rax - pushq %rax - ret + jmp *virtual_mapped_addr(%rip) + + /* Absolute value for PIE support */ +virtual_mapped_addr: + .quad virtual_mapped virtual_mapped: movq RSP(%r8), %rsp -- 2.17.0.441.gb46fe60e1d-goog
Thomas Garnier
2018-May-23 19:54 UTC
[PATCH v3 06/27] x86/entry/64: Adapt assembly for PIE support
Change the assembly code to use only relative references of symbols for the kernel to be PIE compatible. Position Independent Executable (PIE) support will allow to extended the KASLR randomization range below the -2G memory limit. Signed-off-by: Thomas Garnier <thgarnie at google.com> --- arch/x86/entry/entry_64.S | 18 ++++++++++++------ arch/x86/kernel/relocate_kernel_64.S | 8 +++----- 2 files changed, 15 insertions(+), 11 deletions(-) diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S index c9648b287d7f..8638dca78191 100644 --- a/arch/x86/entry/entry_64.S +++ b/arch/x86/entry/entry_64.S @@ -191,7 +191,7 @@ ENTRY(entry_SYSCALL_64_trampoline) * spill RDI and restore it in a second-stage trampoline. */ pushq %rdi - movq $entry_SYSCALL_64_stage2, %rdi + movabsq $entry_SYSCALL_64_stage2, %rdi JMP_NOSPEC %rdi END(entry_SYSCALL_64_trampoline) @@ -1279,7 +1279,8 @@ ENTRY(error_entry) movl %ecx, %eax /* zero extend */ cmpq %rax, RIP+8(%rsp) je .Lbstep_iret - cmpq $.Lgs_change, RIP+8(%rsp) + leaq .Lgs_change(%rip), %rcx + cmpq %rcx, RIP+8(%rsp) jne .Lerror_entry_done /* @@ -1484,10 +1485,10 @@ ENTRY(nmi) * resume the outer NMI. */ - movq $repeat_nmi, %rdx + leaq repeat_nmi(%rip), %rdx cmpq 8(%rsp), %rdx ja 1f - movq $end_repeat_nmi, %rdx + leaq end_repeat_nmi(%rip), %rdx cmpq 8(%rsp), %rdx ja nested_nmi_out 1: @@ -1541,7 +1542,8 @@ nested_nmi: pushq %rdx pushfq pushq $__KERNEL_CS - pushq $repeat_nmi + leaq repeat_nmi(%rip), %rdx + pushq %rdx /* Put stack back */ addq $(6*8), %rsp @@ -1580,7 +1582,11 @@ first_nmi: addq $8, (%rsp) /* Fix up RSP */ pushfq /* RFLAGS */ pushq $__KERNEL_CS /* CS */ - pushq $1f /* RIP */ + pushq $0 /* Futur return address */ + pushq %rax /* Save RAX */ + leaq 1f(%rip), %rax /* RIP */ + movq %rax, 8(%rsp) /* Put 1f on return address */ + popq %rax /* Restore RAX */ iretq /* continues at repeat_nmi below */ UNWIND_HINT_IRET_REGS 1: diff --git a/arch/x86/kernel/relocate_kernel_64.S b/arch/x86/kernel/relocate_kernel_64.S index a7227dfe1a2b..0c0fc259a4e2 100644 --- a/arch/x86/kernel/relocate_kernel_64.S +++ b/arch/x86/kernel/relocate_kernel_64.S @@ -208,11 +208,9 @@ identity_mapped: movq %rax, %cr3 lea PAGE_SIZE(%r8), %rsp call swap_pages - jmp *virtual_mapped_addr(%rip) - - /* Absolute value for PIE support */ -virtual_mapped_addr: - .quad virtual_mapped + movabsq $virtual_mapped, %rax + pushq %rax + ret virtual_mapped: movq RSP(%r8), %rsp -- 2.17.0.441.gb46fe60e1d-goog
Thomas Garnier
2018-May-23 19:54 UTC
[PATCH v3 07/27] x86: pm-trace - Adapt assembly for PIE support
Change assembly to use the new _ASM_MOVABS macro instead of _ASM_MOV for
the assembly to be PIE compatible.
Position Independent Executable (PIE) support will allow to extended the
KASLR randomization range below the -2G memory limit.
Signed-off-by: Thomas Garnier <thgarnie at google.com>
---
arch/x86/include/asm/pm-trace.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/include/asm/pm-trace.h b/arch/x86/include/asm/pm-trace.h
index bfa32aa428e5..972070806ce9 100644
--- a/arch/x86/include/asm/pm-trace.h
+++ b/arch/x86/include/asm/pm-trace.h
@@ -8,7 +8,7 @@
do { \
if (pm_trace_enabled) { \
const void *tracedata; \
- asm volatile(_ASM_MOV " $1f,%0\n" \
+ asm volatile(_ASM_MOVABS " $1f,%0\n" \
".section .tracedata,\"a\"\n" \
"1:\t.word %c1\n\t" \
_ASM_PTR " %c2\n" \
--
2.17.0.441.gb46fe60e1d-goog
Thomas Garnier
2018-May-23 19:54 UTC
[PATCH v3 08/27] x86/CPU: Adapt assembly for PIE support
Change the assembly code to use only relative references of symbols for the
kernel to be PIE compatible. Use the new _ASM_MOVABS macro instead of
the 'mov $symbol, %dst' construct.
Position Independent Executable (PIE) support will allow to extended the
KASLR randomization range below the -2G memory limit.
Signed-off-by: Thomas Garnier <thgarnie at google.com>
---
arch/x86/include/asm/processor.h | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index c119d423eacb..81ae6877df29 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -50,7 +50,7 @@ static inline void *current_text_addr(void)
{
void *pc;
- asm volatile("mov $1f, %0; 1:":"=r" (pc));
+ asm volatile(_ASM_MOVABS " $1f, %0; 1:":"=r" (pc));
return pc;
}
@@ -718,6 +718,7 @@ static inline void sync_core(void)
: ASM_CALL_CONSTRAINT : : "memory");
#else
unsigned int tmp;
+ unsigned long tmp2;
asm volatile (
UNWIND_HINT_SAVE
@@ -728,11 +729,13 @@ static inline void sync_core(void)
"pushfq\n\t"
"mov %%cs, %0\n\t"
"pushq %q0\n\t"
- "pushq $1f\n\t"
+ "leaq 1f(%%rip), %1\n\t"
+ "pushq %1\n\t"
"iretq\n\t"
UNWIND_HINT_RESTORE
"1:"
- : "=&r" (tmp), ASM_CALL_CONSTRAINT : : "cc",
"memory");
+ : "=&r" (tmp), "=&r" (tmp2), ASM_CALL_CONSTRAINT
+ : : "cc", "memory");
#endif
}
--
2.17.0.441.gb46fe60e1d-goog
Thomas Garnier
2018-May-23 19:54 UTC
[PATCH v3 09/27] x86/acpi: Adapt assembly for PIE support
Change the assembly code to use only relative references of symbols for the kernel to be PIE compatible. Position Independent Executable (PIE) support will allow to extended the KASLR randomization range below the -2G memory limit. Signed-off-by: Thomas Garnier <thgarnie at google.com> --- arch/x86/kernel/acpi/wakeup_64.S | 31 ++++++++++++++++--------------- 1 file changed, 16 insertions(+), 15 deletions(-) diff --git a/arch/x86/kernel/acpi/wakeup_64.S b/arch/x86/kernel/acpi/wakeup_64.S index 50b8ed0317a3..472659c0f811 100644 --- a/arch/x86/kernel/acpi/wakeup_64.S +++ b/arch/x86/kernel/acpi/wakeup_64.S @@ -14,7 +14,7 @@ * Hooray, we are in Long 64-bit mode (but still running in low memory) */ ENTRY(wakeup_long64) - movq saved_magic, %rax + movq saved_magic(%rip), %rax movq $0x123456789abcdef0, %rdx cmpq %rdx, %rax jne bogus_64_magic @@ -25,14 +25,14 @@ ENTRY(wakeup_long64) movw %ax, %es movw %ax, %fs movw %ax, %gs - movq saved_rsp, %rsp + movq saved_rsp(%rip), %rsp - movq saved_rbx, %rbx - movq saved_rdi, %rdi - movq saved_rsi, %rsi - movq saved_rbp, %rbp + movq saved_rbx(%rip), %rbx + movq saved_rdi(%rip), %rdi + movq saved_rsi(%rip), %rsi + movq saved_rbp(%rip), %rbp - movq saved_rip, %rax + movq saved_rip(%rip), %rax jmp *%rax ENDPROC(wakeup_long64) @@ -45,7 +45,7 @@ ENTRY(do_suspend_lowlevel) xorl %eax, %eax call save_processor_state - movq $saved_context, %rax + leaq saved_context(%rip), %rax movq %rsp, pt_regs_sp(%rax) movq %rbp, pt_regs_bp(%rax) movq %rsi, pt_regs_si(%rax) @@ -64,13 +64,14 @@ ENTRY(do_suspend_lowlevel) pushfq popq pt_regs_flags(%rax) - movq $.Lresume_point, saved_rip(%rip) + leaq .Lresume_point(%rip), %rax + movq %rax, saved_rip(%rip) - movq %rsp, saved_rsp - movq %rbp, saved_rbp - movq %rbx, saved_rbx - movq %rdi, saved_rdi - movq %rsi, saved_rsi + movq %rsp, saved_rsp(%rip) + movq %rbp, saved_rbp(%rip) + movq %rbx, saved_rbx(%rip) + movq %rdi, saved_rdi(%rip) + movq %rsi, saved_rsi(%rip) addq $8, %rsp movl $3, %edi @@ -82,7 +83,7 @@ ENTRY(do_suspend_lowlevel) .align 4 .Lresume_point: /* We don't restore %rax, it must be 0 anyway */ - movq $saved_context, %rax + leaq saved_context(%rip), %rax movq saved_context_cr4(%rax), %rbx movq %rbx, %cr4 movq saved_context_cr3(%rax), %rbx -- 2.17.0.441.gb46fe60e1d-goog
Thomas Garnier
2018-May-23 19:54 UTC
[PATCH v3 10/27] x86/boot/64: Adapt assembly for PIE support
Change the assembly code to use only relative references of symbols for the kernel to be PIE compatible. Early at boot, the kernel is mapped at a temporary address while preparing the page table. To know the changes needed for the page table with KASLR, the boot code calculate the difference between the expected address of the kernel and the one chosen by KASLR. It does not work with PIE because all symbols in code are relatives. Instead of getting the future relocated virtual address, you will get the current temporary mapping. The solution is using global variables that will be relocated as expected. Position Independent Executable (PIE) support will allow to extended the KASLR randomization range below the -2G memory limit. Signed-off-by: Thomas Garnier <thgarnie at google.com> --- arch/x86/kernel/head_64.S | 26 ++++++++++++++++++++------ 1 file changed, 20 insertions(+), 6 deletions(-) diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S index 8344dd2f310a..7c8f7ce93b9e 100644 --- a/arch/x86/kernel/head_64.S +++ b/arch/x86/kernel/head_64.S @@ -89,8 +89,9 @@ startup_64: popq %rsi /* Form the CR3 value being sure to include the CR3 modifier */ - addq $(early_top_pgt - __START_KERNEL_map), %rax + addq _early_top_pgt_offset(%rip), %rax jmp 1f + ENTRY(secondary_startup_64) UNWIND_HINT_EMPTY /* @@ -119,7 +120,7 @@ ENTRY(secondary_startup_64) popq %rsi /* Form the CR3 value being sure to include the CR3 modifier */ - addq $(init_top_pgt - __START_KERNEL_map), %rax + addq _init_top_offset(%rip), %rax 1: /* Enable PAE mode, PGE and LA57 */ @@ -137,7 +138,7 @@ ENTRY(secondary_startup_64) movq %rax, %cr3 /* Ensure I am executing from virtual addresses */ - movq $1f, %rax + movabs $1f, %rax ANNOTATE_RETPOLINE_SAFE jmp *%rax 1: @@ -234,11 +235,12 @@ ENTRY(secondary_startup_64) * REX.W + FF /5 JMP m16:64 Jump far, absolute indirect, * address given in m16:64. */ - pushq $.Lafter_lret # put return address on stack for unwinder + leaq .Lafter_lret(%rip), %rax + pushq %rax # put return address on stack for unwinder xorq %rbp, %rbp # clear frame pointer - movq initial_code(%rip), %rax + leaq initial_code(%rip), %rax pushq $__KERNEL_CS # set correct cs - pushq %rax # target address in negative space + pushq (%rax) # target address in negative space lretq .Lafter_lret: END(secondary_startup_64) @@ -342,6 +344,18 @@ END(early_idt_handler_common) GLOBAL(early_recursion_flag) .long 0 + /* + * Position Independent Code takes only relative references in code + * meaning a global variable address is relative to RIP and not its + * future virtual address. Global variables can be used instead as they + * are still relocated on the expected kernel mapping address. + */ + .align 8 +_early_top_pgt_offset: + .quad early_top_pgt - __START_KERNEL_map +_init_top_offset: + .quad init_top_pgt - __START_KERNEL_map + #define NEXT_PAGE(name) \ .balign PAGE_SIZE; \ GLOBAL(name) -- 2.17.0.441.gb46fe60e1d-goog
Thomas Garnier
2018-May-23 19:54 UTC
[PATCH v3 11/27] x86/power/64: Adapt assembly for PIE support
Change the assembly code to use only relative references of symbols for the kernel to be PIE compatible. Position Independent Executable (PIE) support will allow to extended the KASLR randomization range below the -2G memory limit. Signed-off-by: Thomas Garnier <thgarnie at google.com> --- arch/x86/power/hibernate_asm_64.S | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/x86/power/hibernate_asm_64.S b/arch/x86/power/hibernate_asm_64.S index ce8da3a0412c..6fdd7bbc3c33 100644 --- a/arch/x86/power/hibernate_asm_64.S +++ b/arch/x86/power/hibernate_asm_64.S @@ -24,7 +24,7 @@ #include <asm/frame.h> ENTRY(swsusp_arch_suspend) - movq $saved_context, %rax + leaq saved_context(%rip), %rax movq %rsp, pt_regs_sp(%rax) movq %rbp, pt_regs_bp(%rax) movq %rsi, pt_regs_si(%rax) @@ -115,7 +115,7 @@ ENTRY(restore_registers) movq %rax, %cr4; # turn PGE back on /* We don't restore %rax, it must be 0 anyway */ - movq $saved_context, %rax + leaq saved_context(%rip), %rax movq pt_regs_sp(%rax), %rsp movq pt_regs_bp(%rax), %rbp movq pt_regs_si(%rax), %rsi -- 2.17.0.441.gb46fe60e1d-goog
Thomas Garnier
2018-May-23 19:54 UTC
[PATCH v3 12/27] x86/paravirt: Adapt assembly for PIE support
if PIE is enabled, switch the paravirt assembly constraints to be compatible. The %c/i constrains generate smaller code so is kept by default. Position Independent Executable (PIE) support will allow to extended the KASLR randomization range below the -2G memory limit. Signed-off-by: Thomas Garnier <thgarnie at google.com> --- arch/x86/include/asm/paravirt_types.h | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/arch/x86/include/asm/paravirt_types.h b/arch/x86/include/asm/paravirt_types.h index 180bc0bff0fb..140747a98d94 100644 --- a/arch/x86/include/asm/paravirt_types.h +++ b/arch/x86/include/asm/paravirt_types.h @@ -337,9 +337,17 @@ extern struct pv_lock_ops pv_lock_ops; #define PARAVIRT_PATCH(x) \ (offsetof(struct paravirt_patch_template, x) / sizeof(void *)) +#ifdef CONFIG_X86_PIE +#define paravirt_opptr_call "a" +#define paravirt_opptr_type "p" +#else +#define paravirt_opptr_call "c" +#define paravirt_opptr_type "i" +#endif + #define paravirt_type(op) \ [paravirt_typenum] "i" (PARAVIRT_PATCH(op)), \ - [paravirt_opptr] "i" (&(op)) + [paravirt_opptr] paravirt_opptr_type (&(op)) #define paravirt_clobber(clobber) \ [paravirt_clobber] "i" (clobber) @@ -395,7 +403,7 @@ int paravirt_disable_iospace(void); */ #define PARAVIRT_CALL \ ANNOTATE_RETPOLINE_SAFE \ - "call *%c[paravirt_opptr];" + "call *%" paravirt_opptr_call "[paravirt_opptr];" /* * These macros are intended to wrap calls through one of the paravirt -- 2.17.0.441.gb46fe60e1d-goog
Thomas Garnier
2018-May-23 19:54 UTC
[PATCH v3 13/27] x86/boot/64: Build head64.c as mcmodel large when PIE is enabled
The __startup_64 function assumes all symbols have relocated addresses
instead of the current boot virtual address. PIE generated code favor
relative addresses making all virtual and physical address math incorrect.
If PIE is enabled, build head64.c as mcmodel large instead to ensure absolute
references on all memory access. Add a global __force_order variable required
when using a large model with read_cr* functions.
To build head64.c as mcmodel=large, disable the retpoline gcc flags.
This code is used at early boot and removed later, it doesn't need
retpoline mitigation.
Position Independent Executable (PIE) support will allow to extended the
KASLR randomization range below the -2G memory limit.
Signed-off-by: Thomas Garnier <thgarnie at google.com>
---
arch/x86/kernel/Makefile | 6 ++++++
arch/x86/kernel/head64.c | 3 +++
2 files changed, 9 insertions(+)
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile
index 02d6f5cf4e70..0f6da4b216e0 100644
--- a/arch/x86/kernel/Makefile
+++ b/arch/x86/kernel/Makefile
@@ -22,6 +22,12 @@ CFLAGS_REMOVE_early_printk.o = -pg
CFLAGS_REMOVE_head64.o = -pg
endif
+ifdef CONFIG_X86_PIE
+# Remove PIE and retpoline flags that are incompatible with mcmodel=large
+CFLAGS_REMOVE_head64.o += -fPIE -mindirect-branch=thunk-extern
-mindirect-branch-register
+CFLAGS_head64.o = -mcmodel=large
+endif
+
KASAN_SANITIZE_head$(BITS).o := n
KASAN_SANITIZE_dumpstack.o := n
KASAN_SANITIZE_dumpstack_$(BITS).o := n
diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index 2d29e47c056e..fa661fb97127 100644
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -64,6 +64,9 @@ EXPORT_SYMBOL(vmemmap_base);
#define __head __section(.head.text)
+/* Required for read_cr3 when building as PIE */
+unsigned long __force_order;
+
static void __head *fixup_pointer(void *ptr, unsigned long physaddr)
{
return ptr - (void *)_text + (void *)physaddr;
--
2.17.0.441.gb46fe60e1d-goog
Thomas Garnier
2018-May-23 19:54 UTC
[PATCH v3 14/27] x86/percpu: Adapt percpu for PIE support
Perpcu uses a clever design where the .percu ELF section has a virtual
address of zero and the relocation code avoid relocating specific
symbols. It makes the code simple and easily adaptable with or without
SMP support.
This design is incompatible with PIE because generated code always try to
access the zero virtual address relative to the default mapping address.
It becomes impossible when KASLR is configured to go below -2G. This
patch solves this problem by removing the zero mapping and adapting the GS
base to be relative to the expected address. These changes are done only
when PIE is enabled. The original implementation is kept as-is
by default.
The assembly and PER_CPU macros are changed to use relative references
when PIE is enabled.
The KALLSYMS_ABSOLUTE_PERCPU configuration is disabled with PIE given
percpu symbols are not absolute in this case.
Position Independent Executable (PIE) support will allow to extended the
KASLR randomization range below the -2G memory limit.
Signed-off-by: Thomas Garnier <thgarnie at google.com>
---
arch/x86/entry/calling.h | 2 +-
arch/x86/entry/entry_64.S | 4 ++--
arch/x86/include/asm/percpu.h | 25 +++++++++++++++++++------
arch/x86/include/asm/processor.h | 4 +++-
arch/x86/kernel/head_64.S | 4 ++++
arch/x86/kernel/setup_percpu.c | 5 ++++-
arch/x86/kernel/vmlinux.lds.S | 13 +++++++++++--
arch/x86/lib/cmpxchg16b_emu.S | 8 ++++----
arch/x86/xen/xen-asm.S | 12 ++++++------
init/Kconfig | 2 +-
10 files changed, 55 insertions(+), 24 deletions(-)
diff --git a/arch/x86/entry/calling.h b/arch/x86/entry/calling.h
index 43c79e78770c..56d403366c5e 100644
--- a/arch/x86/entry/calling.h
+++ b/arch/x86/entry/calling.h
@@ -218,7 +218,7 @@ For 32-bit we have the following conventions - kernel is
built with
.endm
#define THIS_CPU_user_pcid_flush_mask \
- PER_CPU_VAR(cpu_tlbstate) + TLB_STATE_user_pcid_flush_mask
+ PER_CPU_VAR(cpu_tlbstate + TLB_STATE_user_pcid_flush_mask)
.macro SWITCH_TO_USER_CR3_NOSTACK scratch_reg:req scratch_reg2:req
ALTERNATIVE "jmp .Lend_\@", "", X86_FEATURE_PTI
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index 8638dca78191..c1700b00b1b6 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -361,7 +361,7 @@ ENTRY(__switch_to_asm)
#ifdef CONFIG_CC_STACKPROTECTOR
movq TASK_stack_canary(%rsi), %rbx
- movq %rbx, PER_CPU_VAR(irq_stack_union)+stack_canary_offset
+ movq %rbx, PER_CPU_VAR(irq_stack_union + stack_canary_offset)
#endif
#ifdef CONFIG_RETPOLINE
@@ -900,7 +900,7 @@ apicinterrupt IRQ_WORK_VECTOR irq_work_interrupt
smp_irq_work_interrupt
/*
* Exception entry points.
*/
-#define CPU_TSS_IST(x) PER_CPU_VAR(cpu_tss_rw) + (TSS_ist + ((x) - 1) * 8)
+#define CPU_TSS_IST(x) PER_CPU_VAR(cpu_tss_rw + (TSS_ist + ((x) - 1) * 8))
.macro idtentry sym do_sym has_error_code:req paranoid=0 shift_ist=-1
ENTRY(\sym)
diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h
index a06b07399d17..7d1271b536ea 100644
--- a/arch/x86/include/asm/percpu.h
+++ b/arch/x86/include/asm/percpu.h
@@ -5,9 +5,11 @@
#ifdef CONFIG_X86_64
#define __percpu_seg gs
#define __percpu_mov_op movq
+#define __percpu_rel (%rip)
#else
#define __percpu_seg fs
#define __percpu_mov_op movl
+#define __percpu_rel
#endif
#ifdef __ASSEMBLY__
@@ -28,10 +30,14 @@
#define PER_CPU(var, reg) \
__percpu_mov_op %__percpu_seg:this_cpu_off, reg; \
lea var(reg), reg
-#define PER_CPU_VAR(var) %__percpu_seg:var
+/* Compatible with Position Independent Code */
+#define PER_CPU_VAR(var) %__percpu_seg:(var)##__percpu_rel
+/* Rare absolute reference */
+#define PER_CPU_VAR_ABS(var) %__percpu_seg:var
#else /* ! SMP */
#define PER_CPU(var, reg) __percpu_mov_op $var, reg
-#define PER_CPU_VAR(var) var
+#define PER_CPU_VAR(var) (var)##__percpu_rel
+#define PER_CPU_VAR_ABS(var) var
#endif /* SMP */
#ifdef CONFIG_X86_64_SMP
@@ -209,27 +215,34 @@ do { \
pfo_ret__; \
})
+/* Position Independent code uses relative addresses only */
+#ifdef CONFIG_X86_PIE
+#define __percpu_stable_arg __percpu_arg(a1)
+#else
+#define __percpu_stable_arg __percpu_arg(P1)
+#endif
+
#define percpu_stable_op(op, var) \
({ \
typeof(var) pfo_ret__; \
switch (sizeof(var)) { \
case 1: \
- asm(op "b "__percpu_arg(P1)",%0" \
+ asm(op "b "__percpu_stable_arg ",%0" \
: "=q" (pfo_ret__) \
: "p" (&(var))); \
break; \
case 2: \
- asm(op "w "__percpu_arg(P1)",%0" \
+ asm(op "w "__percpu_stable_arg ",%0" \
: "=r" (pfo_ret__) \
: "p" (&(var))); \
break; \
case 4: \
- asm(op "l "__percpu_arg(P1)",%0" \
+ asm(op "l "__percpu_stable_arg ",%0" \
: "=r" (pfo_ret__) \
: "p" (&(var))); \
break; \
case 8: \
- asm(op "q "__percpu_arg(P1)",%0" \
+ asm(op "q "__percpu_stable_arg ",%0" \
: "=r" (pfo_ret__) \
: "p" (&(var))); \
break; \
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 81ae6877df29..5cf36fa30254 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -24,6 +24,7 @@ struct vm86;
#include <asm/special_insns.h>
#include <asm/fpu/types.h>
#include <asm/unwind_hints.h>
+#include <asm/sections.h>
#include <linux/personality.h>
#include <linux/cache.h>
@@ -400,7 +401,8 @@ DECLARE_INIT_PER_CPU(irq_stack_union);
static inline unsigned long cpu_kernelmode_gs_base(int cpu)
{
- return (unsigned long)per_cpu(irq_stack_union.gs_base, cpu);
+ return (unsigned long)per_cpu(irq_stack_union.gs_base, cpu) -
+ (unsigned long)__per_cpu_start;
}
DECLARE_PER_CPU(char *, irq_stack_ptr);
diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S
index 7c8f7ce93b9e..f44b259b26d3 100644
--- a/arch/x86/kernel/head_64.S
+++ b/arch/x86/kernel/head_64.S
@@ -266,7 +266,11 @@ ENDPROC(start_cpu0)
GLOBAL(initial_code)
.quad x86_64_start_kernel
GLOBAL(initial_gs)
+#ifdef CONFIG_X86_PIE
+ .quad 0
+#else
.quad INIT_PER_CPU_VAR(irq_stack_union)
+#endif
GLOBAL(initial_stack)
/*
* The SIZEOF_PTREGS gap is a convention which helps the in-kernel
diff --git a/arch/x86/kernel/setup_percpu.c b/arch/x86/kernel/setup_percpu.c
index ea554f812ee1..d61ecc3d2b6f 100644
--- a/arch/x86/kernel/setup_percpu.c
+++ b/arch/x86/kernel/setup_percpu.c
@@ -26,7 +26,7 @@
DEFINE_PER_CPU_READ_MOSTLY(int, cpu_number);
EXPORT_PER_CPU_SYMBOL(cpu_number);
-#ifdef CONFIG_X86_64
+#if defined(CONFIG_X86_64) && !defined(CONFIG_X86_PIE)
#define BOOT_PERCPU_OFFSET ((unsigned long)__per_cpu_load)
#else
#define BOOT_PERCPU_OFFSET 0
@@ -40,6 +40,9 @@ unsigned long __per_cpu_offset[NR_CPUS] __ro_after_init = {
};
EXPORT_SYMBOL(__per_cpu_offset);
+/* Used to calculate gs_base for each CPU */
+EXPORT_SYMBOL(__per_cpu_start);
+
/*
* On x86_64 symbols referenced from code should be reachable using
* 32bit relocations. Reserve space for static percpu variables in
diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
index 5e1458f609a1..f582fc4776dd 100644
--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/arch/x86/kernel/vmlinux.lds.S
@@ -211,9 +211,14 @@ SECTIONS
/*
* percpu offsets are zero-based on SMP. PERCPU_VADDR() changes the
* output PHDR, so the next output section - .init.text - should
- * start another segment - init.
+ * start another segment - init. For Position Independent Code, the
+ * per-cpu section cannot be zero-based because everything is relative.
*/
+#ifdef CONFIG_X86_PIE
+ PERCPU_SECTION(INTERNODE_CACHE_BYTES)
+#else
PERCPU_VADDR(INTERNODE_CACHE_BYTES, 0, :percpu)
+#endif
ASSERT(SIZEOF(.data..percpu) < CONFIG_PHYSICAL_START,
"per-CPU data too large - increase CONFIG_PHYSICAL_START")
#endif
@@ -389,7 +394,11 @@ SECTIONS
* Per-cpu symbols which need to be offset from __per_cpu_load
* for the boot processor.
*/
+#ifdef CONFIG_X86_PIE
+#define INIT_PER_CPU(x) init_per_cpu__##x = x
+#else
#define INIT_PER_CPU(x) init_per_cpu__##x = x + __per_cpu_load
+#endif
INIT_PER_CPU(gdt_page);
INIT_PER_CPU(irq_stack_union);
@@ -399,7 +408,7 @@ INIT_PER_CPU(irq_stack_union);
. = ASSERT((_end - _text <= KERNEL_IMAGE_SIZE),
"kernel image bigger than KERNEL_IMAGE_SIZE");
-#ifdef CONFIG_SMP
+#if defined(CONFIG_SMP) && !defined(CONFIG_X86_PIE)
. = ASSERT((irq_stack_union == 0),
"irq_stack_union is not at start of per-cpu area");
#endif
diff --git a/arch/x86/lib/cmpxchg16b_emu.S b/arch/x86/lib/cmpxchg16b_emu.S
index 9b330242e740..254950604ae4 100644
--- a/arch/x86/lib/cmpxchg16b_emu.S
+++ b/arch/x86/lib/cmpxchg16b_emu.S
@@ -33,13 +33,13 @@ ENTRY(this_cpu_cmpxchg16b_emu)
pushfq
cli
- cmpq PER_CPU_VAR((%rsi)), %rax
+ cmpq PER_CPU_VAR_ABS((%rsi)), %rax
jne .Lnot_same
- cmpq PER_CPU_VAR(8(%rsi)), %rdx
+ cmpq PER_CPU_VAR_ABS(8(%rsi)), %rdx
jne .Lnot_same
- movq %rbx, PER_CPU_VAR((%rsi))
- movq %rcx, PER_CPU_VAR(8(%rsi))
+ movq %rbx, PER_CPU_VAR_ABS((%rsi))
+ movq %rcx, PER_CPU_VAR_ABS(8(%rsi))
popfq
mov $1, %al
diff --git a/arch/x86/xen/xen-asm.S b/arch/x86/xen/xen-asm.S
index 8019edd0125c..a5d73d3218be 100644
--- a/arch/x86/xen/xen-asm.S
+++ b/arch/x86/xen/xen-asm.S
@@ -21,7 +21,7 @@
ENTRY(xen_irq_enable_direct)
FRAME_BEGIN
/* Unmask events */
- movb $0, PER_CPU_VAR(xen_vcpu_info) + XEN_vcpu_info_mask
+ movb $0, PER_CPU_VAR(xen_vcpu_info + XEN_vcpu_info_mask)
/*
* Preempt here doesn't matter because that will deal with any
@@ -30,7 +30,7 @@ ENTRY(xen_irq_enable_direct)
*/
/* Test for pending */
- testb $0xff, PER_CPU_VAR(xen_vcpu_info) + XEN_vcpu_info_pending
+ testb $0xff, PER_CPU_VAR(xen_vcpu_info + XEN_vcpu_info_pending)
jz 1f
call check_events
@@ -45,7 +45,7 @@ ENTRY(xen_irq_enable_direct)
* non-zero.
*/
ENTRY(xen_irq_disable_direct)
- movb $1, PER_CPU_VAR(xen_vcpu_info) + XEN_vcpu_info_mask
+ movb $1, PER_CPU_VAR(xen_vcpu_info + XEN_vcpu_info_mask)
ret
ENDPROC(xen_irq_disable_direct)
@@ -59,7 +59,7 @@ ENDPROC(xen_irq_disable_direct)
* x86 use opposite senses (mask vs enable).
*/
ENTRY(xen_save_fl_direct)
- testb $0xff, PER_CPU_VAR(xen_vcpu_info) + XEN_vcpu_info_mask
+ testb $0xff, PER_CPU_VAR(xen_vcpu_info + XEN_vcpu_info_mask)
setz %ah
addb %ah, %ah
ret
@@ -80,7 +80,7 @@ ENTRY(xen_restore_fl_direct)
#else
testb $X86_EFLAGS_IF>>8, %ah
#endif
- setz PER_CPU_VAR(xen_vcpu_info) + XEN_vcpu_info_mask
+ setz PER_CPU_VAR(xen_vcpu_info + XEN_vcpu_info_mask)
/*
* Preempt here doesn't matter because that will deal with any
* pending interrupts. The pending check may end up being run
@@ -88,7 +88,7 @@ ENTRY(xen_restore_fl_direct)
*/
/* check for unmasked and pending */
- cmpw $0x0001, PER_CPU_VAR(xen_vcpu_info) + XEN_vcpu_info_pending
+ cmpw $0x0001, PER_CPU_VAR(xen_vcpu_info + XEN_vcpu_info_pending)
jnz 1f
call check_events
1:
diff --git a/init/Kconfig b/init/Kconfig
index 44e62e0dc51f..8915a3ce5f0c 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1391,7 +1391,7 @@ config KALLSYMS_ALL
config KALLSYMS_ABSOLUTE_PERCPU
bool
depends on KALLSYMS
- default X86_64 && SMP
+ default X86_64 && SMP && !X86_PIE
config KALLSYMS_BASE_RELATIVE
bool
--
2.17.0.441.gb46fe60e1d-goog
Thomas Garnier
2018-May-23 19:54 UTC
[PATCH v3 15/27] compiler: Option to default to hidden symbols
Provide an option to default visibility to hidden except for key
symbols. This option is disabled by default and will be used by x86_64
PIE support to remove errors between compilation units.
The default visibility is also enabled for external symbols that are
compared as they maybe equals (start/end of sections). In this case,
older versions of GCC will remove the comparison if the symbols are
hidden. This issue exists at least on gcc 4.9 and before.
Signed-off-by: Thomas Garnier <thgarnie at google.com>
---
arch/x86/boot/boot.h | 2 +-
arch/x86/include/asm/setup.h | 2 +-
arch/x86/kernel/cpu/microcode/core.c | 4 ++--
drivers/base/firmware_loader/main.c | 4 ++--
include/asm-generic/sections.h | 6 ++++++
include/linux/compiler.h | 7 +++++++
init/Kconfig | 7 +++++++
kernel/kallsyms.c | 16 ++++++++--------
kernel/trace/trace.h | 4 ++--
lib/dynamic_debug.c | 4 ++--
10 files changed, 38 insertions(+), 18 deletions(-)
diff --git a/arch/x86/boot/boot.h b/arch/x86/boot/boot.h
index ef5a9cc66fb8..d726c35bdd96 100644
--- a/arch/x86/boot/boot.h
+++ b/arch/x86/boot/boot.h
@@ -193,7 +193,7 @@ static inline bool memcmp_gs(const void *s1, addr_t s2,
size_t len)
}
/* Heap -- available for dynamic lists. */
-extern char _end[];
+extern char _end[] __default_visibility;
extern char *HEAP;
extern char *heap_end;
#define RESET_HEAP() ((void *)( HEAP = _end ))
diff --git a/arch/x86/include/asm/setup.h b/arch/x86/include/asm/setup.h
index ae13bc974416..083a6e99b884 100644
--- a/arch/x86/include/asm/setup.h
+++ b/arch/x86/include/asm/setup.h
@@ -68,7 +68,7 @@ static inline void x86_ce4100_early_setup(void) { }
* This is set up by the setup-routine at boot-time
*/
extern struct boot_params boot_params;
-extern char _text[];
+extern char _text[] __default_visibility;
static inline bool kaslr_enabled(void)
{
diff --git a/arch/x86/kernel/cpu/microcode/core.c
b/arch/x86/kernel/cpu/microcode/core.c
index 77e201301528..6a4f5d9d7eb6 100644
--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -149,8 +149,8 @@ static bool __init check_loader_disabled_bsp(void)
return *res;
}
-extern struct builtin_fw __start_builtin_fw[];
-extern struct builtin_fw __end_builtin_fw[];
+extern struct builtin_fw __start_builtin_fw[] __default_visibility;
+extern struct builtin_fw __end_builtin_fw[] __default_visibility;
bool get_builtin_firmware(struct cpio_data *cd, const char *name)
{
diff --git a/drivers/base/firmware_loader/main.c
b/drivers/base/firmware_loader/main.c
index 0943e7065e0e..2ffd019af2d4 100644
--- a/drivers/base/firmware_loader/main.c
+++ b/drivers/base/firmware_loader/main.c
@@ -94,8 +94,8 @@ static struct firmware_cache fw_cache;
#ifdef CONFIG_FW_LOADER
-extern struct builtin_fw __start_builtin_fw[];
-extern struct builtin_fw __end_builtin_fw[];
+extern struct builtin_fw __start_builtin_fw[] __default_visibility;
+extern struct builtin_fw __end_builtin_fw[] __default_visibility;
static void fw_copy_to_prealloc_buf(struct firmware *fw,
void *buf, size_t size)
diff --git a/include/asm-generic/sections.h b/include/asm-generic/sections.h
index 849cd8eb5ca0..0a0e23405ddd 100644
--- a/include/asm-generic/sections.h
+++ b/include/asm-generic/sections.h
@@ -32,6 +32,9 @@
* __softirqentry_text_start, __softirqentry_text_end
* __start_opd, __end_opd
*/
+#ifdef CONFIG_DEFAULT_HIDDEN
+#pragma GCC visibility push(default)
+#endif
extern char _text[], _stext[], _etext[];
extern char _data[], _sdata[], _edata[];
extern char __bss_start[], __bss_stop[];
@@ -49,6 +52,9 @@ extern char __start_once[], __end_once[];
/* Start and end of .ctors section - used for constructor calls. */
extern char __ctors_start[], __ctors_end[];
+#ifdef CONFIG_DEFAULT_HIDDEN
+#pragma GCC visibility pop
+#endif
/* Start and end of .opd section - used for function descriptors. */
extern char __start_opd[], __end_opd[];
diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index 341b6cf8c029..81a9986cad78 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -278,6 +278,13 @@ unsigned long read_word_at_a_time(const void *addr)
__u.__val; \
})
+#ifdef CONFIG_DEFAULT_HIDDEN
+#pragma GCC visibility push(hidden)
+#define __default_visibility __attribute__((visibility ("default")))
+#else
+#define __default_visibility
+#endif
+
#endif /* __KERNEL__ */
#endif /* __ASSEMBLY__ */
diff --git a/init/Kconfig b/init/Kconfig
index 8915a3ce5f0c..0fc3a58d9f2f 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1694,6 +1694,13 @@ config PROFILING
config TRACEPOINTS
bool
+#
+# Default to hidden visibility for all symbols.
+# Useful for Position Independent Code to reduce global references.
+#
+config DEFAULT_HIDDEN
+ bool
+
source "arch/Kconfig"
endmenu # General setup
diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c
index a23e21ada81b..f4e58b7a6daf 100644
--- a/kernel/kallsyms.c
+++ b/kernel/kallsyms.c
@@ -29,24 +29,24 @@
* These will be re-linked against their real values
* during the second link stage.
*/
-extern const unsigned long kallsyms_addresses[] __weak;
-extern const int kallsyms_offsets[] __weak;
-extern const u8 kallsyms_names[] __weak;
+extern const unsigned long kallsyms_addresses[] __weak __default_visibility;
+extern const int kallsyms_offsets[] __weak __default_visibility;
+extern const u8 kallsyms_names[] __weak __default_visibility;
/*
* Tell the compiler that the count isn't in the small data section if the
arch
* has one (eg: FRV).
*/
extern const unsigned long kallsyms_num_syms
-__attribute__((weak, section(".rodata")));
+__attribute__((weak, section(".rodata"))) __default_visibility;
extern const unsigned long kallsyms_relative_base
-__attribute__((weak, section(".rodata")));
+__attribute__((weak, section(".rodata"))) __default_visibility;
-extern const u8 kallsyms_token_table[] __weak;
-extern const u16 kallsyms_token_index[] __weak;
+extern const u8 kallsyms_token_table[] __weak __default_visibility;
+extern const u16 kallsyms_token_index[] __weak __default_visibility;
-extern const unsigned long kallsyms_markers[] __weak;
+extern const unsigned long kallsyms_markers[] __weak __default_visibility;
/*
* Expand a compressed symbol data into the resulting uncompressed string,
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 6fb46a06c9dc..e659f452cf8c 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -1746,8 +1746,8 @@ extern int trace_event_enable_disable(struct
trace_event_file *file,
int enable, int soft_disable);
extern int tracing_alloc_snapshot(void);
-extern const char *__start___trace_bprintk_fmt[];
-extern const char *__stop___trace_bprintk_fmt[];
+extern const char *__start___trace_bprintk_fmt[] __default_visibility;
+extern const char *__stop___trace_bprintk_fmt[] __default_visibility;
extern const char *__start___tracepoint_str[];
extern const char *__stop___tracepoint_str[];
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index c7c96bc7654a..40b752b53627 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -37,8 +37,8 @@
#include <linux/device.h>
#include <linux/netdevice.h>
-extern struct _ddebug __start___verbose[];
-extern struct _ddebug __stop___verbose[];
+extern struct _ddebug __start___verbose[] __default_visibility;
+extern struct _ddebug __stop___verbose[] __default_visibility;
struct ddebug_table {
struct list_head link;
--
2.17.0.441.gb46fe60e1d-goog
Thomas Garnier
2018-May-23 19:54 UTC
[PATCH v3 16/27] compiler: Option to add PROVIDE_HIDDEN replacement for weak symbols
Provide an option to have a PROVIDE_HIDDEN (linker script) entry for
each weak symbol. This option solve an error in x86_64 where the linker
optimizes pie generate code to be non-pie because --emit-relocs was used
instead of -pie (to reduce dynamic relocations).
Signed-off-by: Thomas Garnier <thgarnie at google.com>
---
init/Kconfig | 7 +++++++
scripts/link-vmlinux.sh | 14 ++++++++++++++
2 files changed, 21 insertions(+)
diff --git a/init/Kconfig b/init/Kconfig
index 0fc3a58d9f2f..2866cca86b4a 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -1954,6 +1954,13 @@ config ASN1
inform it as to what tags are to be expected in a stream and what
functions to call on what tags.
+config WEAK_PROVIDE_HIDDEN
+ bool
+ help
+ Generate linker script PROVIDE_HIDDEN entries for all weak symbols. It
+ allows to prevent non-pie code being replaced by the linker if the
+ emit-relocs option is used instead of pie (useful for x86_64 pie).
+
source "kernel/Kconfig.locks"
config ARCH_HAS_SYNC_CORE_BEFORE_USERMODE
diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
index 4bf811c09f59..f5d31119b9d7 100755
--- a/scripts/link-vmlinux.sh
+++ b/scripts/link-vmlinux.sh
@@ -142,6 +142,17 @@ kallsyms()
${CC} ${aflags} -c -o ${2} ${afile}
}
+gen_weak_provide_hidden()
+{
+ if [ -n "${CONFIG_WEAK_PROVIDE_HIDDEN}" ]; then
+ local pattern="s/^\s\+ w \(\w\+\)$/PROVIDE_HIDDEN(\1 =
.);/gp"
+ echo -e "SECTIONS {\n. = _end;" >
.tmp_vmlinux_hiddenld
+ ${NM} ${1} | sed -n "${pattern}" >>
.tmp_vmlinux_hiddenld
+ echo "}" >> .tmp_vmlinux_hiddenld
+ LDFLAGS_vmlinux="${LDFLAGS_vmlinux} -T
.tmp_vmlinux_hiddenld"
+ fi
+}
+
# Create map file with all symbols from ${1}
# See mksymap for additional details
mksysmap()
@@ -226,6 +237,9 @@ modpost_link vmlinux.o
# modpost vmlinux.o to check for section mismatches
${MAKE} -f "${srctree}/scripts/Makefile.modpost" vmlinux.o
+# Generate weak linker script
+gen_weak_provide_hidden vmlinux.o
+
kallsymso=""
kallsyms_vmlinux=""
if [ -n "${CONFIG_KALLSYMS}" ]; then
--
2.17.0.441.gb46fe60e1d-goog
Change the relocation tool to correctly handle relocations generated by
-fPIE option:
- Add relocation for each entry of the .got section given the linker does not
generate R_X86_64_GLOB_DAT on a simple link.
- Ignore R_X86_64_GOTPCREL.
Signed-off-by: Thomas Garnier <thgarnie at google.com>
---
arch/x86/tools/relocs.c | 93 ++++++++++++++++++++++++++++++++++++++++-
1 file changed, 92 insertions(+), 1 deletion(-)
diff --git a/arch/x86/tools/relocs.c b/arch/x86/tools/relocs.c
index 220e97841e49..a35cc337f883 100644
--- a/arch/x86/tools/relocs.c
+++ b/arch/x86/tools/relocs.c
@@ -32,6 +32,7 @@ struct section {
Elf_Sym *symtab;
Elf_Rel *reltab;
char *strtab;
+ Elf_Addr *got;
};
static struct section *secs;
@@ -293,6 +294,35 @@ static Elf_Sym *sym_lookup(const char *symname)
return 0;
}
+static Elf_Sym *sym_lookup_addr(Elf_Addr addr, const char **name)
+{
+ int i;
+ for (i = 0; i < ehdr.e_shnum; i++) {
+ struct section *sec = &secs[i];
+ long nsyms;
+ Elf_Sym *symtab;
+ Elf_Sym *sym;
+
+ if (sec->shdr.sh_type != SHT_SYMTAB)
+ continue;
+
+ nsyms = sec->shdr.sh_size/sizeof(Elf_Sym);
+ symtab = sec->symtab;
+
+ for (sym = symtab; --nsyms >= 0; sym++) {
+ if (sym->st_value == addr) {
+ if (name) {
+ *name = sym_name(sec->link->strtab,
+ sym);
+ }
+ return sym;
+ }
+ }
+ }
+ return 0;
+}
+
+
#if BYTE_ORDER == LITTLE_ENDIAN
#define le16_to_cpu(val) (val)
#define le32_to_cpu(val) (val)
@@ -513,6 +543,33 @@ static void read_relocs(FILE *fp)
}
}
+static void read_got(FILE *fp)
+{
+ int i;
+ for (i = 0; i < ehdr.e_shnum; i++) {
+ struct section *sec = &secs[i];
+ sec->got = NULL;
+ if (sec->shdr.sh_type != SHT_PROGBITS ||
+ strcmp(sec_name(i), ".got")) {
+ continue;
+ }
+ sec->got = malloc(sec->shdr.sh_size);
+ if (!sec->got) {
+ die("malloc of %d bytes for got failed\n",
+ sec->shdr.sh_size);
+ }
+ if (fseek(fp, sec->shdr.sh_offset, SEEK_SET) < 0) {
+ die("Seek to %d failed: %s\n",
+ sec->shdr.sh_offset, strerror(errno));
+ }
+ if (fread(sec->got, 1, sec->shdr.sh_size, fp)
+ != sec->shdr.sh_size) {
+ die("Cannot read got: %s\n",
+ strerror(errno));
+ }
+ }
+}
+
static void print_absolute_symbols(void)
{
@@ -643,6 +700,32 @@ static void add_reloc(struct relocs *r, uint32_t offset)
r->offset[r->count++] = offset;
}
+/*
+ * The linker does not generate relocations for the GOT for the kernel.
+ * If a GOT is found, simulate the relocations that should have been included.
+ */
+static void walk_got_table(int (*process)(struct section *sec, Elf_Rel *rel,
+ Elf_Sym *sym, const char *symname),
+ struct section *sec)
+{
+ int i;
+ Elf_Addr entry;
+ Elf_Sym *sym;
+ const char *symname;
+ Elf_Rel rel;
+
+ for (i = 0; i < sec->shdr.sh_size/sizeof(Elf_Addr); i++) {
+ entry = sec->got[i];
+ sym = sym_lookup_addr(entry, &symname);
+ if (!sym)
+ die("Could not found got symbol for entry %d\n", i);
+ rel.r_offset = sec->shdr.sh_addr + i * sizeof(Elf_Addr);
+ rel.r_info = ELF_BITS == 64 ? R_X86_64_GLOB_DAT
+ : R_386_GLOB_DAT;
+ process(sec, &rel, sym, symname);
+ }
+}
+
static void walk_relocs(int (*process)(struct section *sec, Elf_Rel *rel,
Elf_Sym *sym, const char *symname))
{
@@ -656,6 +739,8 @@ static void walk_relocs(int (*process)(struct section *sec,
Elf_Rel *rel,
struct section *sec = &secs[i];
if (sec->shdr.sh_type != SHT_REL_TYPE) {
+ if (sec->got)
+ walk_got_table(process, sec);
continue;
}
sec_symtab = sec->link;
@@ -765,6 +850,7 @@ static int do_reloc64(struct section *sec, Elf_Rel *rel,
ElfW(Sym) *sym,
offset += per_cpu_load_addr;
switch (r_type) {
+ case R_X86_64_GOTPCREL:
case R_X86_64_NONE:
/* NONE can be ignored. */
break;
@@ -809,7 +895,7 @@ static int do_reloc64(struct section *sec, Elf_Rel *rel,
ElfW(Sym) *sym,
* the relocations are processed.
* Make sure that the offset will fit.
*/
- if ((int32_t)offset != (int64_t)offset)
+ if (r_type != R_X86_64_64 && (int32_t)offset != (int64_t)offset)
die("Relocation offset doesn't fit in 32 bits\n");
if (r_type == R_X86_64_64)
@@ -818,6 +904,10 @@ static int do_reloc64(struct section *sec, Elf_Rel *rel,
ElfW(Sym) *sym,
add_reloc(&relocs32, offset);
break;
+ case R_X86_64_GLOB_DAT:
+ add_reloc(&relocs64, offset);
+ break;
+
default:
die("Unsupported relocation type: %s (%d)\n",
rel_type(r_type), r_type);
@@ -1087,6 +1177,7 @@ void process(FILE *fp, int use_real_mode, int as_text,
read_strtabs(fp);
read_symtabs(fp);
read_relocs(fp);
+ read_got(fp);
if (ELF_BITS == 64)
percpu_init();
if (show_absolute_syms) {
--
2.17.0.441.gb46fe60e1d-goog
Change the assembly code to use the new _ASM_MOVABS macro which get a
symbol reference while being PIE compatible. Adapt the relocation tool
to ignore 32-bit Xen code.
Position Independent Executable (PIE) support will allow to extended the
KASLR randomization range below the -2G memory limit.
Signed-off-by: Thomas Garnier <thgarnie at google.com>
---
arch/x86/tools/relocs.c | 16 +++++++++++++++-
arch/x86/xen/xen-head.S | 11 ++++++-----
arch/x86/xen/xen-pvh.S | 13 +++++++++----
3 files changed, 30 insertions(+), 10 deletions(-)
diff --git a/arch/x86/tools/relocs.c b/arch/x86/tools/relocs.c
index a35cc337f883..29283ad3950f 100644
--- a/arch/x86/tools/relocs.c
+++ b/arch/x86/tools/relocs.c
@@ -832,6 +832,16 @@ static int is_percpu_sym(ElfW(Sym) *sym, const char
*symname)
strncmp(symname, "init_per_cpu_", 13);
}
+/*
+ * Check if the 32-bit relocation is within the xenpvh 32-bit code.
+ * If so, ignores it.
+ */
+static int is_in_xenpvh_assembly(ElfW(Addr) offset)
+{
+ ElfW(Sym) *sym = sym_lookup("pvh_start_xen");
+ return sym && (offset >= sym->st_value) &&
+ (offset < (sym->st_value + sym->st_size));
+}
static int do_reloc64(struct section *sec, Elf_Rel *rel, ElfW(Sym) *sym,
const char *symname)
@@ -895,8 +905,12 @@ static int do_reloc64(struct section *sec, Elf_Rel *rel,
ElfW(Sym) *sym,
* the relocations are processed.
* Make sure that the offset will fit.
*/
- if (r_type != R_X86_64_64 && (int32_t)offset != (int64_t)offset)
+ if (r_type != R_X86_64_64 &&
+ (int32_t)offset != (int64_t)offset) {
+ if (is_in_xenpvh_assembly(offset))
+ break;
die("Relocation offset doesn't fit in 32 bits\n");
+ }
if (r_type == R_X86_64_64)
add_reloc(&relocs64, offset);
diff --git a/arch/x86/xen/xen-head.S b/arch/x86/xen/xen-head.S
index 5077ead5e59c..4418ff0a1d96 100644
--- a/arch/x86/xen/xen-head.S
+++ b/arch/x86/xen/xen-head.S
@@ -28,14 +28,15 @@ ENTRY(startup_xen)
/* Clear .bss */
xor %eax,%eax
- mov $__bss_start, %_ASM_DI
- mov $__bss_stop, %_ASM_CX
+ _ASM_MOVABS $__bss_start, %_ASM_DI
+ _ASM_MOVABS $__bss_stop, %_ASM_CX
sub %_ASM_DI, %_ASM_CX
shr $__ASM_SEL(2, 3), %_ASM_CX
rep __ASM_SIZE(stos)
- mov %_ASM_SI, xen_start_info
- mov $init_thread_union+THREAD_SIZE, %_ASM_SP
+ _ASM_MOVABS $xen_start_info, %_ASM_AX
+ _ASM_MOV %_ASM_SI, (%_ASM_AX)
+ _ASM_MOVABS $init_thread_union+THREAD_SIZE, %_ASM_SP
#ifdef CONFIG_X86_64
/* Set up %gs.
@@ -46,7 +47,7 @@ ENTRY(startup_xen)
* init data section till per cpu areas are set up.
*/
movl $MSR_GS_BASE,%ecx
- movq $INIT_PER_CPU_VAR(irq_stack_union),%rax
+ movabsq $INIT_PER_CPU_VAR(irq_stack_union),%rax
cdq
wrmsr
#endif
diff --git a/arch/x86/xen/xen-pvh.S b/arch/x86/xen/xen-pvh.S
index e1a5fbeae08d..43e234c7c2de 100644
--- a/arch/x86/xen/xen-pvh.S
+++ b/arch/x86/xen/xen-pvh.S
@@ -101,8 +101,8 @@ ENTRY(pvh_start_xen)
call xen_prepare_pvh
/* startup_64 expects boot_params in %rsi. */
- mov $_pa(pvh_bootparams), %rsi
- mov $_pa(startup_64), %rax
+ movabs $_pa(pvh_bootparams), %rsi
+ movabs $_pa(startup_64), %rax
jmp *%rax
#else /* CONFIG_X86_64 */
@@ -137,10 +137,15 @@ END(pvh_start_xen)
.section ".init.data","aw"
.balign 8
+ /*
+ * Use a quad for _pa(gdt_start) because PIE does not understand a
+ * long is enough. The resulting value will still be in the lower long
+ * part.
+ */
gdt:
.word gdt_end - gdt_start
- .long _pa(gdt_start)
- .word 0
+ .quad _pa(gdt_start)
+ .balign 8
gdt_start:
.quad 0x0000000000000000 /* NULL descriptor */
.quad 0x0000000000000000 /* reserved */
--
2.17.0.441.gb46fe60e1d-goog
Change the assembly code to use only relative references of symbols for the
kernel to be PIE compatible. The new __ASM_MOVABS macro is used to
get the address of a symbol on both 32 and 64-bit with PIE support.
Position Independent Executable (PIE) support will allow to extended the
KASLR randomization range below the -2G memory limit.
Signed-off-by: Thomas Garnier <thgarnie at google.com>
---
arch/x86/include/asm/kvm_host.h | 8 ++++++--
arch/x86/kernel/kvm.c | 6 ++++--
arch/x86/kvm/svm.c | 4 ++--
3 files changed, 12 insertions(+), 6 deletions(-)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index b27de80f5870..312a398465e8 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1389,9 +1389,13 @@ asmlinkage void kvm_spurious_fault(void);
".pushsection .fixup, \"ax\" \n" \
"667: \n\t" \
cleanup_insn "\n\t" \
- "cmpb $0, kvm_rebooting \n\t" \
+ "cmpb $0, kvm_rebooting" __ASM_SEL(,(%%rip)) " \n\t" \
"jne 668b \n\t" \
- __ASM_SIZE(push) " $666b \n\t" \
+ __ASM_SIZE(push) "$0 \n\t" \
+ __ASM_SIZE(push) "%%" _ASM_AX " \n\t" \
+ _ASM_MOVABS " $666b, %%" _ASM_AX "\n\t" \
+ _ASM_MOV " %%" _ASM_AX ", " __ASM_SEL(4,8) "(%%"
_ASM_SP ") \n\t" \
+ __ASM_SIZE(pop) "%%" _ASM_AX " \n\t" \
"call kvm_spurious_fault \n\t" \
".popsection \n\t" \
_ASM_EXTABLE(666b, 667b)
diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
index 7867417cfaff..394c00f21f05 100644
--- a/arch/x86/kernel/kvm.c
+++ b/arch/x86/kernel/kvm.c
@@ -726,8 +726,10 @@ asm(
".global __raw_callee_save___kvm_vcpu_is_preempted;"
".type __raw_callee_save___kvm_vcpu_is_preempted, @function;"
"__raw_callee_save___kvm_vcpu_is_preempted:"
-"movq __per_cpu_offset(,%rdi,8), %rax;"
-"cmpb $0, " __stringify(KVM_STEAL_TIME_preempted)
"+steal_time(%rax);"
+"leaq __per_cpu_offset(%rip), %rax;"
+"movq (%rax,%rdi,8), %rax;"
+"addq " __stringify(KVM_STEAL_TIME_preempted)
"+steal_time(%rip), %rax;"
+"cmpb $0, (%rax);"
"setne %al;"
"ret;"
".popsection");
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 220e5a89465a..2b0b25be5236 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -701,12 +701,12 @@ static u32 svm_msrpm_offset(u32 msr)
static inline void clgi(void)
{
- asm volatile (__ex(SVM_CLGI));
+ asm volatile (__ex(SVM_CLGI) : :);
}
static inline void stgi(void)
{
- asm volatile (__ex(SVM_STGI));
+ asm volatile (__ex(SVM_STGI) : :);
}
static inline void invlpga(unsigned long addr, u32 asid)
--
2.17.0.441.gb46fe60e1d-goog
Add an off-by-default configuration option to use a global stack cookie
instead of the default TLS. This configuration option will only be used
with PIE binaries.
For kernel stack cookie, the compiler uses the mcmodel=kernel to switch
between the fs segment to gs segment. A PIE binary does not use
mcmodel=kernel because it can be relocated anywhere, therefore the
compiler will default to the fs segment register. This is fixed on the
latest version of gcc.
If the segment selector is available, it will be automatically added. If
the automatic configuration was selected, a warning is written and the
global variable stack cookie is used. If a specific stack mode was
selected (regular or strong) and the compiler does not support selecting
the segment register, an error is emitted.
Signed-off-by: Thomas Garnier <thgarnie at google.com>
---
arch/x86/Kconfig | 12 ++++++++++++
arch/x86/Makefile | 9 +++++++++
arch/x86/entry/entry_32.S | 3 ++-
arch/x86/entry/entry_64.S | 3 ++-
arch/x86/include/asm/processor.h | 3 ++-
arch/x86/include/asm/stackprotector.h | 19 ++++++++++++++-----
arch/x86/kernel/asm-offsets.c | 3 ++-
arch/x86/kernel/asm-offsets_32.c | 3 ++-
arch/x86/kernel/asm-offsets_64.c | 3 ++-
arch/x86/kernel/cpu/common.c | 3 ++-
arch/x86/kernel/head_32.S | 3 ++-
arch/x86/kernel/process.c | 5 +++++
12 files changed, 56 insertions(+), 13 deletions(-)
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index dda87a331a7e..0fc2e981458d 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2199,6 +2199,18 @@ config RANDOMIZE_MEMORY_PHYSICAL_PADDING
If unsure, leave at the default value.
+config X86_GLOBAL_STACKPROTECTOR
+ bool "Stack cookie using a global variable"
+ depends on CC_STACKPROTECTOR_AUTO
+ default n
+ ---help---
+ This option turns on the "stack-protector" GCC feature using a
global
+ variable instead of a segment register. It is useful when the
+ compiler does not support custom segment registers when building a
+ position independent (PIE) binary.
+
+ If unsure, say N
+
config HOTPLUG_CPU
bool "Support for hot-pluggable CPUs"
depends on SMP
diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index 60135cbd905c..277ffc57ae13 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -141,6 +141,15 @@ else
KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)
endif
+ifdef CONFIG_X86_GLOBAL_STACKPROTECTOR
+ ifeq ($(call cc-option, -mstack-protector-guard=global),)
+ $(error Cannot use CONFIG_X86_GLOBAL_STACKPROTECTOR: \
+ -mstack-protector-guard=global not supported \
+ by compiler)
+ endif
+ KBUILD_CFLAGS += -mstack-protector-guard=global
+endif
+
ifdef CONFIG_X86_X32
x32_ld_ok := $(call try-run,\
/bin/echo -e '1: .quad 1b' | \
diff --git a/arch/x86/entry/entry_32.S b/arch/x86/entry/entry_32.S
index bb4f540be234..2f9bdbc6be6d 100644
--- a/arch/x86/entry/entry_32.S
+++ b/arch/x86/entry/entry_32.S
@@ -241,7 +241,8 @@ ENTRY(__switch_to_asm)
movl %esp, TASK_threadsp(%eax)
movl TASK_threadsp(%edx), %esp
-#ifdef CONFIG_CC_STACKPROTECTOR
+#if defined(CONFIG_CC_STACKPROTECTOR) && \
+ !defined(CONFIG_X86_GLOBAL_STACKPROTECTOR)
movl TASK_stack_canary(%edx), %ebx
movl %ebx, PER_CPU_VAR(stack_canary)+stack_canary_offset
#endif
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index c1700b00b1b6..c8b4e8a7d1e1 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -359,7 +359,8 @@ ENTRY(__switch_to_asm)
movq %rsp, TASK_threadsp(%rdi)
movq TASK_threadsp(%rsi), %rsp
-#ifdef CONFIG_CC_STACKPROTECTOR
+#if defined(CONFIG_CC_STACKPROTECTOR) && \
+ !defined(CONFIG_X86_GLOBAL_STACKPROTECTOR)
movq TASK_stack_canary(%rsi), %rbx
movq %rbx, PER_CPU_VAR(irq_stack_union + stack_canary_offset)
#endif
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 5cf36fa30254..6e5d9ac3bf17 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -414,7 +414,8 @@ extern asmlinkage void ignore_sysret(void);
void save_fsgs_for_kvm(void);
#endif
#else /* X86_64 */
-#ifdef CONFIG_CC_STACKPROTECTOR
+#if defined(CONFIG_CC_STACKPROTECTOR) && \
+ !defined(CONFIG_X86_GLOBAL_STACKPROTECTOR)
/*
* Make sure stack canary segment base is cached-aligned:
* "For Intel Atom processors, avoid non zero segment base address
diff --git a/arch/x86/include/asm/stackprotector.h
b/arch/x86/include/asm/stackprotector.h
index 371b3a4af000..5063f57d99f5 100644
--- a/arch/x86/include/asm/stackprotector.h
+++ b/arch/x86/include/asm/stackprotector.h
@@ -52,6 +52,10 @@
#define GDT_STACK_CANARY_INIT \
[GDT_ENTRY_STACK_CANARY] = GDT_ENTRY_INIT(0x4090, 0, 0x18),
+#ifdef CONFIG_X86_GLOBAL_STACKPROTECTOR
+extern unsigned long __stack_chk_guard;
+#endif
+
/*
* Initialize the stackprotector canary value.
*
@@ -63,7 +67,7 @@ static __always_inline void boot_init_stack_canary(void)
u64 canary;
u64 tsc;
-#ifdef CONFIG_X86_64
+#if defined(CONFIG_X86_64) &&
!defined(CONFIG_X86_GLOBAL_STACKPROTECTOR)
BUILD_BUG_ON(offsetof(union irq_stack_union, stack_canary) != 40);
#endif
/*
@@ -77,17 +81,22 @@ static __always_inline void boot_init_stack_canary(void)
canary += tsc + (tsc << 32UL);
canary &= CANARY_MASK;
+#ifdef CONFIG_X86_GLOBAL_STACKPROTECTOR
+ if (__stack_chk_guard == 0)
+ __stack_chk_guard = canary ?: 1;
+#else /* !CONFIG_X86_GLOBAL_STACKPROTECTOR */
current->stack_canary = canary;
#ifdef CONFIG_X86_64
this_cpu_write(irq_stack_union.stack_canary, canary);
-#else
+#else /* CONFIG_X86_32 */
this_cpu_write(stack_canary.canary, canary);
#endif
+#endif
}
static inline void setup_stack_canary_segment(int cpu)
{
-#ifdef CONFIG_X86_32
+#if defined(CONFIG_X86_32) &&
!defined(CONFIG_X86_GLOBAL_STACKPROTECTOR)
unsigned long canary = (unsigned long)&per_cpu(stack_canary, cpu);
struct desc_struct *gdt_table = get_cpu_gdt_rw(cpu);
struct desc_struct desc;
@@ -100,7 +109,7 @@ static inline void setup_stack_canary_segment(int cpu)
static inline void load_stack_canary_segment(void)
{
-#ifdef CONFIG_X86_32
+#if defined(CONFIG_X86_32) &&
!defined(CONFIG_X86_GLOBAL_STACKPROTECTOR)
asm("mov %0, %%gs" : : "r" (__KERNEL_STACK_CANARY) :
"memory");
#endif
}
@@ -116,7 +125,7 @@ static inline void setup_stack_canary_segment(int cpu)
static inline void load_stack_canary_segment(void)
{
-#ifdef CONFIG_X86_32
+#if defined(CONFIG_X86_32) &&
!defined(CONFIG_X86_GLOBAL_STACKPROTECTOR)
asm volatile ("mov %0, %%gs" : : "r" (0));
#endif
}
diff --git a/arch/x86/kernel/asm-offsets.c b/arch/x86/kernel/asm-offsets.c
index 76417a9aab73..4c9e1b667bda 100644
--- a/arch/x86/kernel/asm-offsets.c
+++ b/arch/x86/kernel/asm-offsets.c
@@ -32,7 +32,8 @@
void common(void) {
BLANK();
OFFSET(TASK_threadsp, task_struct, thread.sp);
-#ifdef CONFIG_CC_STACKPROTECTOR
+#if defined(CONFIG_CC_STACKPROTECTOR) && \
+ !defined(CONFIG_X86_GLOBAL_STACKPROTECTOR)
OFFSET(TASK_stack_canary, task_struct, stack_canary);
#endif
diff --git a/arch/x86/kernel/asm-offsets_32.c b/arch/x86/kernel/asm-offsets_32.c
index f91ba53e06c8..cf8ef55a8b82 100644
--- a/arch/x86/kernel/asm-offsets_32.c
+++ b/arch/x86/kernel/asm-offsets_32.c
@@ -50,7 +50,8 @@ void foo(void)
DEFINE(TSS_sysenter_sp0, offsetof(struct cpu_entry_area, tss.x86_tss.sp0) -
offsetofend(struct cpu_entry_area, entry_stack_page.stack));
-#ifdef CONFIG_CC_STACKPROTECTOR
+#if defined(CONFIG_CC_STACKPROTECTOR) && \
+ !defined(CONFIG_X86_GLOBAL_STACKPROTECTOR)
BLANK();
OFFSET(stack_canary_offset, stack_canary, canary);
#endif
diff --git a/arch/x86/kernel/asm-offsets_64.c b/arch/x86/kernel/asm-offsets_64.c
index bf51e51d808d..a3c7e14f6434 100644
--- a/arch/x86/kernel/asm-offsets_64.c
+++ b/arch/x86/kernel/asm-offsets_64.c
@@ -69,7 +69,8 @@ int main(void)
OFFSET(TSS_sp1, tss_struct, x86_tss.sp1);
BLANK();
-#ifdef CONFIG_CC_STACKPROTECTOR
+#if defined(CONFIG_CC_STACKPROTECTOR) && \
+ !defined(CONFIG_X86_GLOBAL_STACKPROTECTOR)
DEFINE(stack_canary_offset, offsetof(union irq_stack_union, stack_canary));
BLANK();
#endif
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 39ed2e6ff8a0..d279a7df5018 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -1540,7 +1540,8 @@ DEFINE_PER_CPU(unsigned long, cpu_current_top_of_stack)
(unsigned long)&init_thread_union + THREAD_SIZE;
EXPORT_PER_CPU_SYMBOL(cpu_current_top_of_stack);
-#ifdef CONFIG_CC_STACKPROTECTOR
+#if defined(CONFIG_CC_STACKPROTECTOR) && \
+ !defined(CONFIG_X86_GLOBAL_STACKPROTECTOR)
DEFINE_PER_CPU_ALIGNED(struct stack_canary, stack_canary);
#endif
diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S
index b59e4fb40fd9..0e849242de91 100644
--- a/arch/x86/kernel/head_32.S
+++ b/arch/x86/kernel/head_32.S
@@ -375,7 +375,8 @@ ENDPROC(startup_32_smp)
*/
__INIT
setup_once:
-#ifdef CONFIG_CC_STACKPROTECTOR
+#if defined(CONFIG_CC_STACKPROTECTOR) && \
+ !defined(CONFIG_X86_GLOBAL_STACKPROTECTOR)
/*
* Configure the stack canary. The linker can't handle this by
* relocation. Manually set base address in stack canary
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 03408b942adb..ebe21d258a82 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -86,6 +86,11 @@ EXPORT_PER_CPU_SYMBOL(cpu_tss_rw);
DEFINE_PER_CPU(bool, __tss_limit_invalid);
EXPORT_PER_CPU_SYMBOL_GPL(__tss_limit_invalid);
+#ifdef CONFIG_X86_GLOBAL_STACKPROTECTOR
+unsigned long __stack_chk_guard __read_mostly;
+EXPORT_SYMBOL(__stack_chk_guard);
+#endif
+
/*
* this gets called so that we can store lazy state into memory and copy the
* current task into the new thread.
--
2.17.0.441.gb46fe60e1d-goog
Thomas Garnier
2018-May-23 19:54 UTC
[PATCH v3 21/27] x86/ftrace: Adapt function tracing for PIE support
When using -fPIE/PIC with function tracing, the compiler generates a
call through the GOT (call *__fentry__ at GOTPCREL). This instruction
takes 6 bytes instead of 5 on the usual relative call.
If PIE is enabled, replace the 6th byte of the GOT call by a 1-byte nop
so ftrace can handle the previous 5-bytes as before.
Position Independent Executable (PIE) support will allow to extended the
KASLR randomization range below the -2G memory limit.
Signed-off-by: Thomas Garnier <thgarnie at google.com>
---
arch/x86/include/asm/ftrace.h | 6 +++--
arch/x86/include/asm/sections.h | 4 ++++
arch/x86/kernel/ftrace.c | 42 +++++++++++++++++++++++++++++++--
3 files changed, 48 insertions(+), 4 deletions(-)
diff --git a/arch/x86/include/asm/ftrace.h b/arch/x86/include/asm/ftrace.h
index c18ed65287d5..8f2decce38d8 100644
--- a/arch/x86/include/asm/ftrace.h
+++ b/arch/x86/include/asm/ftrace.h
@@ -25,9 +25,11 @@ extern void __fentry__(void);
static inline unsigned long ftrace_call_adjust(unsigned long addr)
{
/*
- * addr is the address of the mcount call instruction.
- * recordmcount does the necessary offset calculation.
+ * addr is the address of the mcount call instruction. PIE has always a
+ * byte added to the start of the function.
*/
+ if (IS_ENABLED(CONFIG_X86_PIE))
+ addr -= 1;
return addr;
}
diff --git a/arch/x86/include/asm/sections.h b/arch/x86/include/asm/sections.h
index 5c019d23d06b..da3d98bb2bcb 100644
--- a/arch/x86/include/asm/sections.h
+++ b/arch/x86/include/asm/sections.h
@@ -13,4 +13,8 @@ extern char __end_rodata_hpage_align[];
extern char __entry_trampoline_start[], __entry_trampoline_end[];
#endif
+#if defined(CONFIG_X86_PIE)
+extern char __start_got[], __end_got[];
+#endif
+
#endif /* _ASM_X86_SECTIONS_H */
diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c
index 01ebcb6f263e..73b3c30cb7a3 100644
--- a/arch/x86/kernel/ftrace.c
+++ b/arch/x86/kernel/ftrace.c
@@ -102,7 +102,7 @@ static const unsigned char *ftrace_nop_replace(void)
static int
ftrace_modify_code_direct(unsigned long ip, unsigned const char *old_code,
- unsigned const char *new_code)
+ unsigned const char *new_code)
{
unsigned char replaced[MCOUNT_INSN_SIZE];
@@ -135,6 +135,44 @@ ftrace_modify_code_direct(unsigned long ip, unsigned const
char *old_code,
return 0;
}
+/* Bytes before call GOT offset */
+const unsigned char got_call_preinsn[] = { 0xff, 0x15 };
+
+static int
+ftrace_modify_initial_code(unsigned long ip, unsigned const char *old_code,
+ unsigned const char *new_code)
+{
+ unsigned char replaced[MCOUNT_INSN_SIZE + 1];
+
+ ftrace_expected = old_code;
+
+ /*
+ * If PIE is not enabled or no GOT call was found, default to the
+ * original approach to code modification.
+ */
+ if (!IS_ENABLED(CONFIG_X86_PIE) ||
+ probe_kernel_read(replaced, (void *)ip, sizeof(replaced)) ||
+ memcmp(replaced, got_call_preinsn, sizeof(got_call_preinsn)))
+ return ftrace_modify_code_direct(ip, old_code, new_code);
+
+ /*
+ * Build a nop slide with a 5-byte nop and 1-byte nop to keep the ftrace
+ * hooking algorithm working with the expected 5 bytes instruction.
+ */
+ memcpy(replaced, new_code, MCOUNT_INSN_SIZE);
+ replaced[MCOUNT_INSN_SIZE] = ideal_nops[1][0];
+
+ ip = text_ip_addr(ip);
+
+ if (probe_kernel_write((void *)ip, replaced, sizeof(replaced)))
+ return -EPERM;
+
+ sync_core();
+
+ return 0;
+
+}
+
int ftrace_make_nop(struct module *mod,
struct dyn_ftrace *rec, unsigned long addr)
{
@@ -153,7 +191,7 @@ int ftrace_make_nop(struct module *mod,
* just modify the code directly.
*/
if (addr == MCOUNT_ADDR)
- return ftrace_modify_code_direct(rec->ip, old, new);
+ return ftrace_modify_initial_code(rec->ip, old, new);
ftrace_expected = NULL;
--
2.17.0.441.gb46fe60e1d-goog
Thomas Garnier
2018-May-23 19:54 UTC
[PATCH v3 22/27] x86/modules: Add option to start module section after kernel
Add an option so the module section is just after the mapped kernel. It
will ensure position independent modules are always at the right
distance from the kernel and do not require mcmodule=large. It also
optimize the available size for modules by getting rid of the empty
space on kernel randomization range.
Signed-off-by: Thomas Garnier <thgarnie at google.com>
---
Documentation/x86/x86_64/mm.txt | 3 +++
arch/x86/Kconfig | 4 ++++
arch/x86/include/asm/pgtable_64_types.h | 6 ++++++
arch/x86/kernel/head64.c | 5 ++++-
arch/x86/mm/dump_pagetables.c | 3 ++-
5 files changed, 19 insertions(+), 2 deletions(-)
diff --git a/Documentation/x86/x86_64/mm.txt b/Documentation/x86/x86_64/mm.txt
index 600bc2afa27d..e3810a1db74b 100644
--- a/Documentation/x86/x86_64/mm.txt
+++ b/Documentation/x86/x86_64/mm.txt
@@ -79,3 +79,6 @@ Their order is preserved but their base will be offset early
at boot time.
Be very careful vs. KASLR when changing anything here. The KASLR address
range must not overlap with anything except the KASAN shadow area, which is
correct as KASAN disables KASLR.
+
+If CONFIG_DYNAMIC_MODULE_BASE is enabled, the module section follows the end of
+the mapped kernel.
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 0fc2e981458d..28eb2b3757bf 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2199,6 +2199,10 @@ config RANDOMIZE_MEMORY_PHYSICAL_PADDING
If unsure, leave at the default value.
+# Module section starts just after the end of the kernel module
+config DYNAMIC_MODULE_BASE
+ bool
+
config X86_GLOBAL_STACKPROTECTOR
bool "Stack cookie using a global variable"
depends on CC_STACKPROTECTOR_AUTO
diff --git a/arch/x86/include/asm/pgtable_64_types.h
b/arch/x86/include/asm/pgtable_64_types.h
index adb47552e6bb..3ab25b908879 100644
--- a/arch/x86/include/asm/pgtable_64_types.h
+++ b/arch/x86/include/asm/pgtable_64_types.h
@@ -7,6 +7,7 @@
#ifndef __ASSEMBLY__
#include <linux/types.h>
#include <asm/kaslr.h>
+#include <asm/sections.h>
/*
* These are used to make use of C type-checking..
@@ -126,7 +127,12 @@ extern unsigned int ptrs_per_p4d;
#define VMALLOC_END (VMALLOC_START + (VMALLOC_SIZE_TB << 40) - 1)
+#ifdef CONFIG_DYNAMIC_MODULE_BASE
+#define MODULES_VADDR ALIGN(((unsigned long)_end + PAGE_SIZE), PMD_SIZE)
+#else
#define MODULES_VADDR (__START_KERNEL_map + KERNEL_IMAGE_SIZE)
+#endif
+
/* The module sections ends with the start of the fixmap */
#define MODULES_END _AC(0xffffffffff000000, UL)
#define MODULES_LEN (MODULES_END - MODULES_VADDR)
diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index fa661fb97127..3a1ce822e1c0 100644
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -394,12 +394,15 @@ asmlinkage __visible void __init x86_64_start_kernel(char
* real_mode_data)
* Build-time sanity checks on the kernel image and module
* area mappings. (these are purely build-time and produce no code)
*/
+#ifndef CONFIG_DYNAMIC_MODULE_BASE
BUILD_BUG_ON(MODULES_VADDR < __START_KERNEL_map);
BUILD_BUG_ON(MODULES_VADDR - __START_KERNEL_map < KERNEL_IMAGE_SIZE);
- BUILD_BUG_ON(MODULES_LEN + KERNEL_IMAGE_SIZE > 2*PUD_SIZE);
+ BUILD_BUG_ON(!IS_ENABLED(CONFIG_RANDOMIZE_BASE_LARGE) &&
+ MODULES_LEN + KERNEL_IMAGE_SIZE > 2*PUD_SIZE);
BUILD_BUG_ON((__START_KERNEL_map & ~PMD_MASK) != 0);
BUILD_BUG_ON((MODULES_VADDR & ~PMD_MASK) != 0);
BUILD_BUG_ON(!(MODULES_VADDR > __START_KERNEL));
+#endif
MAYBE_BUILD_BUG_ON(!(((MODULES_END - 1) & PGDIR_MASK) =
(__START_KERNEL & PGDIR_MASK)));
BUILD_BUG_ON(__fix_to_virt(__end_of_fixed_addresses) <= MODULES_END);
diff --git a/arch/x86/mm/dump_pagetables.c b/arch/x86/mm/dump_pagetables.c
index cc7ff5957194..dca4098ce4fd 100644
--- a/arch/x86/mm/dump_pagetables.c
+++ b/arch/x86/mm/dump_pagetables.c
@@ -105,7 +105,7 @@ static struct addr_marker address_markers[] = {
[EFI_END_NR] = { EFI_VA_END, "EFI Runtime Services" },
#endif
[HIGH_KERNEL_NR] = { __START_KERNEL_map, "High Kernel Mapping" },
- [MODULES_VADDR_NR] = { MODULES_VADDR, "Modules" },
+ [MODULES_VADDR_NR] = { 0/*MODULES_VADDR*/, "Modules" },
[MODULES_END_NR] = { MODULES_END, "End Modules" },
[FIXADDR_START_NR] = { FIXADDR_START, "Fixmap Area" },
[END_OF_SPACE_NR] = { -1, NULL }
@@ -600,6 +600,7 @@ static int __init pt_dump_init(void)
address_markers[KASAN_SHADOW_START_NR].start_address = KASAN_SHADOW_START;
address_markers[KASAN_SHADOW_END_NR].start_address = KASAN_SHADOW_END;
#endif
+ address_markers[MODULES_VADDR_NR].start_address = MODULES_VADDR;
#endif
#ifdef CONFIG_X86_32
address_markers[VMALLOC_START_NR].start_address = VMALLOC_START;
--
2.17.0.441.gb46fe60e1d-goog
Thomas Garnier
2018-May-23 19:54 UTC
[PATCH v3 23/27] x86/modules: Adapt module loading for PIE support
Adapt module loading to support PIE relocations. Generate dynamic GOT if
a symbol requires it but no entry exist in the kernel GOT.
Position Independent Executable (PIE) support will allow to extended the
KASLR randomization range below the -2G memory limit.
Signed-off-by: Thomas Garnier <thgarnie at google.com>
---
arch/x86/Makefile | 4 +
arch/x86/include/asm/module.h | 11 ++
arch/x86/include/asm/sections.h | 4 +
arch/x86/kernel/module.c | 181 +++++++++++++++++++++++++++++++-
arch/x86/kernel/module.lds | 3 +
5 files changed, 198 insertions(+), 5 deletions(-)
create mode 100644 arch/x86/kernel/module.lds
diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index 277ffc57ae13..20bb6cbd8938 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -134,7 +134,11 @@ else
KBUILD_CFLAGS += $(cflags-y)
KBUILD_CFLAGS += -mno-red-zone
+ifdef CONFIG_X86_PIE
+ KBUILD_LDFLAGS_MODULE += -T $(srctree)/arch/x86/kernel/module.lds
+else
KBUILD_CFLAGS += -mcmodel=kernel
+endif
# -funit-at-a-time shrinks the kernel .text considerably
# unfortunately it makes reading oopses harder.
diff --git a/arch/x86/include/asm/module.h b/arch/x86/include/asm/module.h
index 7948a17febb4..68ff05e14288 100644
--- a/arch/x86/include/asm/module.h
+++ b/arch/x86/include/asm/module.h
@@ -5,12 +5,23 @@
#include <asm-generic/module.h>
#include <asm/orc_types.h>
+#ifdef CONFIG_X86_PIE
+struct mod_got_sec {
+ struct elf64_shdr *got;
+ int got_num_entries;
+ int got_max_entries;
+};
+#endif
+
struct mod_arch_specific {
#ifdef CONFIG_UNWINDER_ORC
unsigned int num_orcs;
int *orc_unwind_ip;
struct orc_entry *orc_unwind;
#endif
+#ifdef CONFIG_X86_PIE
+ struct mod_got_sec core;
+#endif
};
#ifdef CONFIG_X86_64
diff --git a/arch/x86/include/asm/sections.h b/arch/x86/include/asm/sections.h
index da3d98bb2bcb..89b3a95c8d11 100644
--- a/arch/x86/include/asm/sections.h
+++ b/arch/x86/include/asm/sections.h
@@ -17,4 +17,8 @@ extern char __entry_trampoline_start[],
__entry_trampoline_end[];
extern char __start_got[], __end_got[];
#endif
+#if defined(CONFIG_X86_PIE)
+extern char __start_got[], __end_got[];
+#endif
+
#endif /* _ASM_X86_SECTIONS_H */
diff --git a/arch/x86/kernel/module.c b/arch/x86/kernel/module.c
index f58336af095c..88895f3d474b 100644
--- a/arch/x86/kernel/module.c
+++ b/arch/x86/kernel/module.c
@@ -30,6 +30,7 @@
#include <linux/gfp.h>
#include <linux/jump_label.h>
#include <linux/random.h>
+#include <linux/sort.h>
#include <asm/text-patching.h>
#include <asm/page.h>
@@ -77,6 +78,173 @@ static unsigned long int get_module_load_offset(void)
}
#endif
+#ifdef CONFIG_X86_PIE
+static u64 find_got_kernel_entry(Elf64_Sym *sym, const Elf64_Rela *rela)
+{
+ u64 *pos;
+
+ for (pos = (u64*)__start_got; pos < (u64*)__end_got; pos++) {
+ if (*pos == sym->st_value)
+ return (u64)pos + rela->r_addend;
+ }
+
+ return 0;
+}
+
+static u64 module_emit_got_entry(struct module *mod, void *loc,
+ const Elf64_Rela *rela, Elf64_Sym *sym)
+{
+ struct mod_got_sec *gotsec = &mod->arch.core;
+ u64 *got = (u64*)gotsec->got->sh_addr;
+ int i = gotsec->got_num_entries;
+ u64 ret;
+
+ /* Check if we can use the kernel GOT */
+ ret = find_got_kernel_entry(sym, rela);
+ if (ret)
+ return ret;
+
+ got[i] = sym->st_value;
+
+ /*
+ * Check if the entry we just created is a duplicate. Given that the
+ * relocations are sorted, this will be the last entry we allocated.
+ * (if one exists).
+ */
+ if (i > 0 && got[i] == got[i - 2]) {
+ ret = (u64)&got[i - 1];
+ } else {
+ gotsec->got_num_entries++;
+ BUG_ON(gotsec->got_num_entries > gotsec->got_max_entries);
+ ret = (u64)&got[i];
+ }
+
+ return ret + rela->r_addend;
+}
+
+#define cmp_3way(a,b) ((a) < (b) ? -1 : (a) > (b))
+
+static int cmp_rela(const void *a, const void *b)
+{
+ const Elf64_Rela *x = a, *y = b;
+ int i;
+
+ /* sort by type, symbol index and addend */
+ i = cmp_3way(ELF64_R_TYPE(x->r_info), ELF64_R_TYPE(y->r_info));
+ if (i == 0)
+ i = cmp_3way(ELF64_R_SYM(x->r_info), ELF64_R_SYM(y->r_info));
+ if (i == 0)
+ i = cmp_3way(x->r_addend, y->r_addend);
+ return i;
+}
+
+static bool duplicate_rel(const Elf64_Rela *rela, int num)
+{
+ /*
+ * Entries are sorted by type, symbol index and addend. That means
+ * that, if a duplicate entry exists, it must be in the preceding
+ * slot.
+ */
+ return num > 0 && cmp_rela(rela + num, rela + num - 1) == 0;
+}
+
+static unsigned int count_gots(Elf64_Sym *syms, Elf64_Rela *rela, int num)
+{
+ unsigned int ret = 0;
+ Elf64_Sym *s;
+ int i;
+
+ for (i = 0; i < num; i++) {
+ switch (ELF64_R_TYPE(rela[i].r_info)) {
+ case R_X86_64_GOTPCREL:
+ s = syms + ELF64_R_SYM(rela[i].r_info);
+
+ /*
+ * Use the kernel GOT when possible, else reserve a
+ * custom one for this module.
+ */
+ if (!duplicate_rel(rela, i) &&
+ !find_got_kernel_entry(s, rela + i))
+ ret++;
+ break;
+ }
+ }
+ return ret;
+}
+
+/*
+ * Generate GOT entries for GOTPCREL relocations that do not exists in the
+ * kernel GOT. Based on arm64 module-plts implementation.
+ */
+int module_frob_arch_sections(Elf_Ehdr *ehdr, Elf_Shdr *sechdrs,
+ char *secstrings, struct module *mod)
+{
+ unsigned long gots = 0;
+ Elf_Shdr *symtab = NULL;
+ Elf64_Sym *syms = NULL;
+ char *strings, *name;
+ int i;
+
+ /*
+ * Find the empty .got section so we can expand it to store the PLT
+ * entries. Record the symtab address as well.
+ */
+ for (i = 0; i < ehdr->e_shnum; i++) {
+ if (!strcmp(secstrings + sechdrs[i].sh_name, ".got")) {
+ mod->arch.core.got = sechdrs + i;
+ } else if (sechdrs[i].sh_type == SHT_SYMTAB) {
+ symtab = sechdrs + i;
+ syms = (Elf64_Sym *)symtab->sh_addr;
+ }
+ }
+
+ if (!mod->arch.core.got) {
+ pr_err("%s: module GOT section missing\n", mod->name);
+ return -ENOEXEC;
+ }
+ if (!syms) {
+ pr_err("%s: module symtab section missing\n", mod->name);
+ return -ENOEXEC;
+ }
+
+ for (i = 0; i < ehdr->e_shnum; i++) {
+ Elf64_Rela *rels = (void *)ehdr + sechdrs[i].sh_offset;
+ int numrels = sechdrs[i].sh_size / sizeof(Elf64_Rela);
+
+ if (sechdrs[i].sh_type != SHT_RELA)
+ continue;
+
+ /* sort by type, symbol index and addend */
+ sort(rels, numrels, sizeof(Elf64_Rela), cmp_rela, NULL);
+
+ gots += count_gots(syms, rels, numrels);
+ }
+
+ mod->arch.core.got->sh_type = SHT_NOBITS;
+ mod->arch.core.got->sh_flags = SHF_ALLOC;
+ mod->arch.core.got->sh_addralign = L1_CACHE_BYTES;
+ mod->arch.core.got->sh_size = (gots + 1) * sizeof(u64);
+ mod->arch.core.got_num_entries = 0;
+ mod->arch.core.got_max_entries = gots;
+
+ /*
+ * If a _GLOBAL_OFFSET_TABLE_ symbol exists, make it absolute for
+ * modules to correctly reference it. Similar to s390 implementation.
+ */
+ strings = (void *) ehdr + sechdrs[symtab->sh_link].sh_offset;
+ for (i = 0; i < symtab->sh_size/sizeof(Elf_Sym); i++) {
+ if (syms[i].st_shndx != SHN_UNDEF)
+ continue;
+ name = strings + syms[i].st_name;
+ if (!strcmp(name, "_GLOBAL_OFFSET_TABLE_")) {
+ syms[i].st_shndx = SHN_ABS;
+ break;
+ }
+ }
+ return 0;
+}
+#endif
+
void *module_alloc(unsigned long size)
{
void *p;
@@ -190,16 +358,20 @@ int apply_relocate_add(Elf64_Shdr *sechdrs,
if ((s64)val != *(s32 *)loc)
goto overflow;
break;
+#ifdef CONFIG_X86_PIE
+ case R_X86_64_GOTPCREL:
+ val = module_emit_got_entry(me, loc, rel + i, sym);
+ /* fallthrough */
+#endif
case R_X86_64_PC32:
case R_X86_64_PLT32:
if (*(u32 *)loc != 0)
goto invalid_relocation;
val -= (u64)loc;
*(u32 *)loc = val;
-#if 0
- if ((s64)val != *(s32 *)loc)
+ if (IS_ENABLED(CONFIG_X86_PIE) &&
+ (s64)val != *(s32 *)loc)
goto overflow;
-#endif
break;
default:
pr_err("%s: Unknown rela relocation: %llu\n",
@@ -217,8 +389,7 @@ int apply_relocate_add(Elf64_Shdr *sechdrs,
overflow:
pr_err("overflow in relocation type %d val %Lx\n",
(int)ELF64_R_TYPE(rel[i].r_info), val);
- pr_err("`%s' likely not compiled with -mcmodel=kernel\n",
- me->name);
+ pr_err("`%s' likely too far from the kernel\n", me->name);
return -ENOEXEC;
}
#endif
diff --git a/arch/x86/kernel/module.lds b/arch/x86/kernel/module.lds
new file mode 100644
index 000000000000..fd6e95a4b454
--- /dev/null
+++ b/arch/x86/kernel/module.lds
@@ -0,0 +1,3 @@
+SECTIONS {
+ .got (NOLOAD) : { BYTE(0) }
+}
--
2.17.0.441.gb46fe60e1d-goog
The GOT is changed during early boot when relocations are applied. Make
it read-only directly. This table exists only for PIE binary.
Position Independent Executable (PIE) support will allow to extended the
KASLR randomization range below the -2G memory limit.
Signed-off-by: Thomas Garnier <thgarnie at google.com>
---
include/asm-generic/vmlinux.lds.h | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/include/asm-generic/vmlinux.lds.h
b/include/asm-generic/vmlinux.lds.h
index e373e2e10f6a..e5b0710fe693 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -314,6 +314,17 @@
__end_ro_after_init = .;
#endif
+#ifdef CONFIG_X86_PIE
+#define RO_GOT_X86 \
+ .got : AT(ADDR(.got) - LOAD_OFFSET) { \
+ VMLINUX_SYMBOL(__start_got) = .; \
+ *(.got); \
+ VMLINUX_SYMBOL(__end_got) = .; \
+ }
+#else
+#define RO_GOT_X86
+#endif
+
/*
* Read only Data
*/
@@ -370,6 +381,7 @@
__end_builtin_fw = .; \
} \
\
+ RO_GOT_X86 \
TRACEDATA \
\
/* Kernel symbol table: Normal symbols */ \
--
2.17.0.441.gb46fe60e1d-goog
Thomas Garnier
2018-May-23 19:54 UTC
[PATCH v3 25/27] x86/pie: Add option to build the kernel as PIE
Add the CONFIG_X86_PIE option which builds the kernel as a Position
Independent Executable (PIE). The kernel is currently build with the
mcmodel=kernel option which forces it to stay on the top 2G of the
virtual address space. With PIE, the kernel will be able to move below
the current limit.
The --emit-relocs linker option was kept instead of using -pie to limit
the impact on mapped sections. Any incompatible relocation will be
catch by the arch/x86/tools/relocs binary at compile time.
If segment based stack cookies are enabled, try to use the compiler
option to select the segment register. If not available, automatically
enabled global stack cookie in auto mode. Otherwise, recommend
compiler update or global stack cookie option.
Performance/Size impact:
Size of vmlinux (Default configuration):
File size:
- PIE disabled: +0.18%
- PIE enabled: -1.977% (less relocations)
.text section:
- PIE disabled: same
- PIE enabled: same
Size of vmlinux (Ubuntu configuration):
File size:
- PIE disabled: +0.21%
- PIE enabled: +10%
.text section:
- PIE disabled: same
- PIE enabled: +0.001%
The size increase is mainly due to not having access to the 32-bit signed
relocation that can be used with mcmodel=kernel. A small part is due to reduced
optimization for PIE code. This bug [1] was opened with gcc to provide a better
code generation for kernel PIE.
Hackbench (50% and 1600% on thread/process for pipe/sockets):
- PIE disabled: no significant change (avg -/+ 0.5% on latest test).
- PIE enabled: between -1% to +1% in average (default and Ubuntu config).
Kernbench (average of 10 Half and Optimal runs):
Elapsed Time:
- PIE disabled: no significant change (avg -0.5%)
- PIE enabled: average -0.5% to +0.5%
System Time:
- PIE disabled: no significant change (avg -0.1%)
- PIE enabled: average -0.4% to +0.4%.
[1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82303
Signed-off-by: Thomas Garnier <thgarnie at google.com>
merge pie
---
arch/x86/Kconfig | 8 ++++++++
arch/x86/Makefile | 45 ++++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 52 insertions(+), 1 deletion(-)
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 28eb2b3757bf..26d5d4942777 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2215,6 +2215,14 @@ config X86_GLOBAL_STACKPROTECTOR
If unsure, say N
+config X86_PIE
+ bool
+ depends on X86_64
+ select DEFAULT_HIDDEN
+ select WEAK_PROVIDE_HIDDEN
+ select DYNAMIC_MODULE_BASE
+ select MODULE_REL_CRCS if MODVERSIONS
+
config HOTPLUG_CPU
bool "Support for hot-pluggable CPUs"
depends on SMP
diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index 20bb6cbd8938..c92bcca4400c 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -60,6 +60,8 @@ endif
KBUILD_CFLAGS += -mno-sse -mno-mmx -mno-sse2 -mno-3dnow
KBUILD_CFLAGS += $(call cc-option,-mno-avx,)
+stackglobal := $(call cc-option-yn, -mstack-protector-guard=global)
+
ifeq ($(CONFIG_X86_32),y)
BITS := 32
UTS_MACHINE := i386
@@ -135,7 +137,48 @@ else
KBUILD_CFLAGS += -mno-red-zone
ifdef CONFIG_X86_PIE
+ KBUILD_CFLAGS += -fPIE
KBUILD_LDFLAGS_MODULE += -T $(srctree)/arch/x86/kernel/module.lds
+
+ # Relax relocation in both CFLAGS and LDFLAGS to support older
compilers
+ KBUILD_CFLAGS += $(call cc-option,-Wa$(comma)-mrelax-relocations=no)
+ LDFLAGS_vmlinux += $(call ld-option,--no-relax)
+ KBUILD_LDFLAGS_MODULE += $(call ld-option,--no-relax)
+
+ # Stack validation is not yet support due to self-referenced switches
+ifdef CONFIG_STACK_VALIDATION
+ $(warning CONFIG_STACK_VALIDATION is not yet supported for x86_64 pie \
+ build.)
+ SKIP_STACK_VALIDATION := 1
+ export SKIP_STACK_VALIDATION
+endif
+
+ifndef CONFIG_CC_STACKPROTECTOR_NONE
+ifndef CONFIG_X86_GLOBAL_STACKPROTECTOR
+ stackseg-flag := -mstack-protector-guard-reg=%gs
+ ifeq ($(call cc-option-yn,$(stackseg-flag)),n)
+ # Try to enable global stack cookie if possible
+ ifeq ($(stackglobal), y)
+ $(warning Cannot use CONFIG_CC_STACKPROTECTOR_* while \
+ building a position independent kernel. \
+ Default to global stack protector \
+ (CONFIG_X86_GLOBAL_STACKPROTECTOR).)
+ CONFIG_X86_GLOBAL_STACKPROTECTOR := y
+ KBUILD_CFLAGS += -DCONFIG_X86_GLOBAL_STACKPROTECTOR
+ KBUILD_AFLAGS += -DCONFIG_X86_GLOBAL_STACKPROTECTOR
+ else
+ $(error echo Cannot use \
+ CONFIG_CC_STACKPROTECTOR_(REGULAR|STRONG|AUTO)
\
+ while building a position independent binary. \
+ Update your compiler or use \
+ CONFIG_X86_GLOBAL_STACKPROTECTOR)
+ endif
+ else
+ KBUILD_CFLAGS += $(stackseg-flag)
+ endif
+endif
+endif
+
else
KBUILD_CFLAGS += -mcmodel=kernel
endif
@@ -146,7 +189,7 @@ endif
endif
ifdef CONFIG_X86_GLOBAL_STACKPROTECTOR
- ifeq ($(call cc-option, -mstack-protector-guard=global),)
+ ifeq ($(stackglobal), n)
$(error Cannot use CONFIG_X86_GLOBAL_STACKPROTECTOR: \
-mstack-protector-guard=global not supported \
by compiler)
--
2.17.0.441.gb46fe60e1d-goog
Thomas Garnier
2018-May-23 19:54 UTC
[PATCH v3 26/27] x86/relocs: Add option to generate 64-bit relocations
The x86 relocation tool generates a list of 32-bit signed integers. There
was no need to use 64-bit integers because all addresses where above the 2G
top of the memory.
This change add a large-reloc option to generate 64-bit unsigned integers.
It can be used when the kernel plan to go below the top 2G and 32-bit
integers are not enough.
Signed-off-by: Thomas Garnier <thgarnie at google.com>
---
arch/x86/tools/relocs.c | 60 +++++++++++++++++++++++++++-------
arch/x86/tools/relocs.h | 4 +--
arch/x86/tools/relocs_common.c | 15 ++++++---
3 files changed, 60 insertions(+), 19 deletions(-)
diff --git a/arch/x86/tools/relocs.c b/arch/x86/tools/relocs.c
index 29283ad3950f..a29cccceaac6 100644
--- a/arch/x86/tools/relocs.c
+++ b/arch/x86/tools/relocs.c
@@ -13,8 +13,14 @@
static Elf_Ehdr ehdr;
+#if ELF_BITS == 64
+typedef uint64_t rel_off_t;
+#else
+typedef uint32_t rel_off_t;
+#endif
+
struct relocs {
- uint32_t *offset;
+ rel_off_t *offset;
unsigned long count;
unsigned long size;
};
@@ -685,7 +691,7 @@ static void print_absolute_relocs(void)
printf("\n");
}
-static void add_reloc(struct relocs *r, uint32_t offset)
+static void add_reloc(struct relocs *r, rel_off_t offset)
{
if (r->count == r->size) {
unsigned long newsize = r->size + 50000;
@@ -1061,26 +1067,48 @@ static void sort_relocs(struct relocs *r)
qsort(r->offset, r->count, sizeof(r->offset[0]), cmp_relocs);
}
-static int write32(uint32_t v, FILE *f)
+static int write32(rel_off_t rel, FILE *f)
{
- unsigned char buf[4];
+ unsigned char buf[sizeof(uint32_t)];
+ uint32_t v = (uint32_t)rel;
put_unaligned_le32(v, buf);
- return fwrite(buf, 1, 4, f) == 4 ? 0 : -1;
+ return fwrite(buf, 1, sizeof(buf), f) == sizeof(buf) ? 0 : -1;
}
-static int write32_as_text(uint32_t v, FILE *f)
+static int write32_as_text(rel_off_t rel, FILE *f)
{
+ uint32_t v = (uint32_t)rel;
return fprintf(f, "\t.long 0x%08"PRIx32"\n", v) > 0 ? 0
: -1;
}
-static void emit_relocs(int as_text, int use_real_mode)
+static int write64(rel_off_t rel, FILE *f)
+{
+ unsigned char buf[sizeof(uint64_t)];
+ uint64_t v = (uint64_t)rel;
+
+ put_unaligned_le64(v, buf);
+ return fwrite(buf, 1, sizeof(buf), f) == sizeof(buf) ? 0 : -1;
+}
+
+static int write64_as_text(rel_off_t rel, FILE *f)
+{
+ uint64_t v = (uint64_t)rel;
+ return fprintf(f, "\t.quad 0x%016"PRIx64"\n", v) > 0 ?
0 : -1;
+}
+
+static void emit_relocs(int as_text, int use_real_mode, int use_large_reloc)
{
int i;
- int (*write_reloc)(uint32_t, FILE *) = write32;
+ int (*write_reloc)(rel_off_t, FILE *);
int (*do_reloc)(struct section *sec, Elf_Rel *rel, Elf_Sym *sym,
const char *symname);
+ if (use_large_reloc)
+ write_reloc = write64;
+ else
+ write_reloc = write32;
+
#if ELF_BITS == 64
if (!use_real_mode)
do_reloc = do_reloc64;
@@ -1091,6 +1119,9 @@ static void emit_relocs(int as_text, int use_real_mode)
do_reloc = do_reloc32;
else
do_reloc = do_reloc_real;
+
+ /* Large relocations only for 64-bit */
+ use_large_reloc = 0;
#endif
/* Collect up the relocations */
@@ -1114,8 +1145,13 @@ static void emit_relocs(int as_text, int use_real_mode)
* gas will like.
*/
printf(".section \".data.reloc\",\"a\"\n");
- printf(".balign 4\n");
- write_reloc = write32_as_text;
+ if (use_large_reloc) {
+ printf(".balign 8\n");
+ write_reloc = write64_as_text;
+ } else {
+ printf(".balign 4\n");
+ write_reloc = write32_as_text;
+ }
}
if (use_real_mode) {
@@ -1183,7 +1219,7 @@ static void print_reloc_info(void)
void process(FILE *fp, int use_real_mode, int as_text,
int show_absolute_syms, int show_absolute_relocs,
- int show_reloc_info)
+ int show_reloc_info, int use_large_reloc)
{
regex_init(use_real_mode);
read_ehdr(fp);
@@ -1206,5 +1242,5 @@ void process(FILE *fp, int use_real_mode, int as_text,
print_reloc_info();
return;
}
- emit_relocs(as_text, use_real_mode);
+ emit_relocs(as_text, use_real_mode, use_large_reloc);
}
diff --git a/arch/x86/tools/relocs.h b/arch/x86/tools/relocs.h
index 43c83c0fd22c..3d401da59df7 100644
--- a/arch/x86/tools/relocs.h
+++ b/arch/x86/tools/relocs.h
@@ -31,8 +31,8 @@ enum symtype {
void process_32(FILE *fp, int use_real_mode, int as_text,
int show_absolute_syms, int show_absolute_relocs,
- int show_reloc_info);
+ int show_reloc_info, int use_large_reloc);
void process_64(FILE *fp, int use_real_mode, int as_text,
int show_absolute_syms, int show_absolute_relocs,
- int show_reloc_info);
+ int show_reloc_info, int use_large_reloc);
#endif /* RELOCS_H */
diff --git a/arch/x86/tools/relocs_common.c b/arch/x86/tools/relocs_common.c
index 6634352a20bc..11f49adf1c06 100644
--- a/arch/x86/tools/relocs_common.c
+++ b/arch/x86/tools/relocs_common.c
@@ -12,14 +12,14 @@ void die(char *fmt, ...)
static void usage(void)
{
- die("relocs
[--abs-syms|--abs-relocs|--reloc-info|--text|--realmode]" \
- " vmlinux\n");
+ die("relocs
[--abs-syms|--abs-relocs|--reloc-info|--text|--realmode|" \
+ "--large-reloc] vmlinux\n");
}
int main(int argc, char **argv)
{
int show_absolute_syms, show_absolute_relocs, show_reloc_info;
- int as_text, use_real_mode;
+ int as_text, use_real_mode, use_large_reloc;
const char *fname;
FILE *fp;
int i;
@@ -30,6 +30,7 @@ int main(int argc, char **argv)
show_reloc_info = 0;
as_text = 0;
use_real_mode = 0;
+ use_large_reloc = 0;
fname = NULL;
for (i = 1; i < argc; i++) {
char *arg = argv[i];
@@ -54,6 +55,10 @@ int main(int argc, char **argv)
use_real_mode = 1;
continue;
}
+ if (strcmp(arg, "--large-reloc") == 0) {
+ use_large_reloc = 1;
+ continue;
+ }
}
else if (!fname) {
fname = arg;
@@ -75,11 +80,11 @@ int main(int argc, char **argv)
if (e_ident[EI_CLASS] == ELFCLASS64)
process_64(fp, use_real_mode, as_text,
show_absolute_syms, show_absolute_relocs,
- show_reloc_info);
+ show_reloc_info, use_large_reloc);
else
process_32(fp, use_real_mode, as_text,
show_absolute_syms, show_absolute_relocs,
- show_reloc_info);
+ show_reloc_info, use_large_reloc);
fclose(fp);
return 0;
}
--
2.17.0.441.gb46fe60e1d-goog
Thomas Garnier
2018-May-23 19:54 UTC
[PATCH v3 27/27] x86/kaslr: Add option to extend KASLR range from 1GB to 3GB
Add a new CONFIG_RANDOMIZE_BASE_LARGE option to benefit from PIE
support. It increases the KASLR range from 1GB to 3GB. The new range
stars at 0xffffffff00000000 just above the EFI memory region. This
option is off by default.
The boot code is adapted to create the appropriate page table spanning
three PUD pages.
The relocation table uses 64-bit integers generated with the updated
relocation tool with the large-reloc option.
Signed-off-by: Thomas Garnier <thgarnie at google.com>
---
arch/x86/Kconfig | 21 +++++++++++++++++++++
arch/x86/boot/compressed/Makefile | 5 +++++
arch/x86/boot/compressed/misc.c | 10 +++++++++-
arch/x86/include/asm/page_64_types.h | 9 +++++++++
arch/x86/kernel/head64.c | 15 ++++++++++++---
arch/x86/kernel/head_64.S | 11 ++++++++++-
6 files changed, 66 insertions(+), 5 deletions(-)
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 26d5d4942777..3596a7a76ff0 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2223,6 +2223,27 @@ config X86_PIE
select DYNAMIC_MODULE_BASE
select MODULE_REL_CRCS if MODVERSIONS
+config RANDOMIZE_BASE_LARGE
+ bool "Increase the randomization range of the kernel image"
+ depends on X86_64 && RANDOMIZE_BASE
+ select X86_PIE
+ select X86_MODULE_PLTS if MODULES
+ default n
+ ---help---
+ Build the kernel as a Position Independent Executable (PIE) and
+ increase the available randomization range from 1GB to 3GB.
+
+ This option impacts performance on kernel CPU intensive workloads up
+ to 10% due to PIE generated code. Impact on user-mode processes and
+ typical usage would be significantly less (0.50% when you build the
+ kernel).
+
+ The kernel and modules will generate slightly more assembly (1 to 2%
+ increase on the .text sections). The vmlinux binary will be
+ significantly smaller due to less relocations.
+
+ If unsure say N
+
config HOTPLUG_CPU
bool "Support for hot-pluggable CPUs"
depends on SMP
diff --git a/arch/x86/boot/compressed/Makefile
b/arch/x86/boot/compressed/Makefile
index fa42f895fdde..8497ebd5e078 100644
--- a/arch/x86/boot/compressed/Makefile
+++ b/arch/x86/boot/compressed/Makefile
@@ -116,7 +116,12 @@ $(obj)/vmlinux.bin: vmlinux FORCE
targets += $(patsubst $(obj)/%,%,$(vmlinux-objs-y)) vmlinux.bin.all
vmlinux.relocs
+# Large randomization require bigger relocation table
+ifeq ($(CONFIG_RANDOMIZE_BASE_LARGE),y)
+CMD_RELOCS = arch/x86/tools/relocs --large-reloc
+else
CMD_RELOCS = arch/x86/tools/relocs
+endif
quiet_cmd_relocs = RELOCS $@
cmd_relocs = $(CMD_RELOCS) $< > $@;$(CMD_RELOCS) --abs-relocs $<
$(obj)/vmlinux.relocs: vmlinux FORCE
diff --git a/arch/x86/boot/compressed/misc.c b/arch/x86/boot/compressed/misc.c
index 8dd1d5ccae58..28d17bd5bad8 100644
--- a/arch/x86/boot/compressed/misc.c
+++ b/arch/x86/boot/compressed/misc.c
@@ -171,10 +171,18 @@ void __puthex(unsigned long value)
}
#if CONFIG_X86_NEED_RELOCS
+
+/* Large randomization go lower than -2G and use large relocation table */
+#ifdef CONFIG_RANDOMIZE_BASE_LARGE
+typedef long rel_t;
+#else
+typedef int rel_t;
+#endif
+
static void handle_relocations(void *output, unsigned long output_len,
unsigned long virt_addr)
{
- int *reloc;
+ rel_t *reloc;
unsigned long delta, map, ptr;
unsigned long min_addr = (unsigned long)output;
unsigned long max_addr = min_addr + (VO___bss_start - VO__text);
diff --git a/arch/x86/include/asm/page_64_types.h
b/arch/x86/include/asm/page_64_types.h
index 2c5a966dc222..85ea681421d2 100644
--- a/arch/x86/include/asm/page_64_types.h
+++ b/arch/x86/include/asm/page_64_types.h
@@ -46,7 +46,11 @@
#define __PAGE_OFFSET __PAGE_OFFSET_BASE_L4
#endif /* CONFIG_DYNAMIC_MEMORY_LAYOUT */
+#ifdef CONFIG_RANDOMIZE_BASE_LARGE
+#define __START_KERNEL_map _AC(0xffffffff00000000, UL)
+#else
#define __START_KERNEL_map _AC(0xffffffff80000000, UL)
+#endif /* CONFIG_RANDOMIZE_BASE_LARGE */
/* See Documentation/x86/x86_64/mm.txt for a description of the memory map. */
@@ -64,9 +68,14 @@
* 512MiB by default, leaving 1.5GiB for modules once the page tables
* are fully set up. If kernel ASLR is configured, it can extend the
* kernel page table mapping, reducing the size of the modules area.
+ * On PIE, we relocate the binary 2G lower so add this extra space.
*/
#if defined(CONFIG_RANDOMIZE_BASE)
+#ifdef CONFIG_RANDOMIZE_BASE_LARGE
+#define KERNEL_IMAGE_SIZE (_AC(3, UL) * 1024 * 1024 * 1024)
+#else
#define KERNEL_IMAGE_SIZE (1024 * 1024 * 1024)
+#endif
#else
#define KERNEL_IMAGE_SIZE (512 * 1024 * 1024)
#endif
diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index 3a1ce822e1c0..e18cc23b9d99 100644
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -63,6 +63,7 @@ EXPORT_SYMBOL(vmemmap_base);
#endif
#define __head __section(.head.text)
+#define pud_count(x) (((x + (PUD_SIZE - 1)) & ~(PUD_SIZE - 1)) >>
PUD_SHIFT)
/* Required for read_cr3 when building as PIE */
unsigned long __force_order;
@@ -118,6 +119,8 @@ unsigned long __head __startup_64(unsigned long physaddr,
{
unsigned long load_delta, *p;
unsigned long pgtable_flags;
+ unsigned long level3_kernel_start, level3_kernel_count;
+ unsigned long level3_fixmap_start;
pgdval_t *pgd;
p4dval_t *p4d;
pudval_t *pud;
@@ -149,6 +152,11 @@ unsigned long __head __startup_64(unsigned long physaddr,
/* Include the SME encryption mask in the fixup value */
load_delta += sme_get_me_mask();
+ /* Look at the randomization spread to adapt page table used */
+ level3_kernel_start = pud_index(__START_KERNEL_map);
+ level3_kernel_count = pud_count(KERNEL_IMAGE_SIZE);
+ level3_fixmap_start = level3_kernel_start + level3_kernel_count;
+
/* Fixup the physical addresses in the page table */
pgd = fixup_pointer(&early_top_pgt, physaddr);
@@ -165,8 +173,9 @@ unsigned long __head __startup_64(unsigned long physaddr,
}
pud = fixup_pointer(&level3_kernel_pgt, physaddr);
- pud[510] += load_delta;
- pud[511] += load_delta;
+ for (i = 0; i < level3_kernel_count; i++)
+ pud[level3_kernel_start + i] += load_delta;
+ pud[level3_fixmap_start] += load_delta;
pmd = fixup_pointer(level2_fixmap_pgt, physaddr);
pmd[506] += load_delta;
@@ -224,7 +233,7 @@ unsigned long __head __startup_64(unsigned long physaddr,
*/
pmd = fixup_pointer(level2_kernel_pgt, physaddr);
- for (i = 0; i < PTRS_PER_PMD; i++) {
+ for (i = 0; i < PTRS_PER_PMD * level3_kernel_count; i++) {
if (pmd[i] & _PAGE_PRESENT)
pmd[i] += load_delta;
}
diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S
index f44b259b26d3..50343b9ba5da 100644
--- a/arch/x86/kernel/head_64.S
+++ b/arch/x86/kernel/head_64.S
@@ -41,12 +41,16 @@
#define l4_index(x) (((x) >> 39) & 511)
#define pud_index(x) (((x) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
+#define pud_count(x) (((x + (PUD_SIZE - 1)) & ~(PUD_SIZE - 1)) >>
PUD_SHIFT)
L4_PAGE_OFFSET = l4_index(__PAGE_OFFSET_BASE_L4)
L4_START_KERNEL = l4_index(__START_KERNEL_map)
L3_START_KERNEL = pud_index(__START_KERNEL_map)
+/* Adapt page table L3 space based on range of randomization */
+L3_KERNEL_ENTRY_COUNT = pud_count(KERNEL_IMAGE_SIZE)
+
.text
__HEAD
.code64
@@ -441,7 +445,12 @@ NEXT_PAGE(level4_kernel_pgt)
NEXT_PAGE(level3_kernel_pgt)
.fill L3_START_KERNEL,8,0
/* (2^48-(2*1024*1024*1024)-((2^39)*511))/(2^30) = 510 */
- .quad level2_kernel_pgt - __START_KERNEL_map + _KERNPG_TABLE_NOENC
+ i = 0
+ .rept L3_KERNEL_ENTRY_COUNT
+ .quad level2_kernel_pgt - __START_KERNEL_map + _KERNPG_TABLE_NOENC \
+ + PAGE_SIZE*i
+ i = i + 1
+ .endr
.quad level2_fixmap_pgt - __START_KERNEL_map + _PAGE_TABLE_NOENC
NEXT_PAGE(level2_kernel_pgt)
--
2.17.0.441.gb46fe60e1d-goog
Randy Dunlap
2018-May-23 21:16 UTC
[PATCH v3 16/27] compiler: Option to add PROVIDE_HIDDEN replacement for weak symbols
On 05/23/2018 12:54 PM, Thomas Garnier wrote:> Provide an option to have a PROVIDE_HIDDEN (linker script) entry for > each weak symbol. This option solve an error in x86_64 where the linkersolves> optimizes pie generate code to be non-pie because --emit-relocs was usedgenerated> instead of -pie (to reduce dynamic relocations). > > Signed-off-by: Thomas Garnier <thgarnie at google.com> > --- > init/Kconfig | 7 +++++++ > scripts/link-vmlinux.sh | 14 ++++++++++++++ > 2 files changed, 21 insertions(+) > > diff --git a/init/Kconfig b/init/Kconfig > index 0fc3a58d9f2f..2866cca86b4a 100644 > --- a/init/Kconfig > +++ b/init/Kconfig > @@ -1954,6 +1954,13 @@ config ASN1 > inform it as to what tags are to be expected in a stream and what > functions to call on what tags. > > +config WEAK_PROVIDE_HIDDEN > + bool > + help > + Generate linker script PROVIDE_HIDDEN entries for all weak symbols. It > + allows to prevent non-pie code being replaced by the linker if thenon-PIE> + emit-relocs option is used instead of pie (useful for x86_64 pie).PIE PIE).> +-- ~Randy
Randy Dunlap
2018-May-23 21:26 UTC
[PATCH v3 23/27] x86/modules: Adapt module loading for PIE support
Hi, (for several patches in this series:) The commit message is confusing. See below. On 05/23/2018 12:54 PM, Thomas Garnier wrote:> Adapt module loading to support PIE relocations. Generate dynamic GOT if > a symbol requires it but no entry exist in the kernel GOT.exists> > Position Independent Executable (PIE) support will allow to extended thewill allow us to extend the> KASLR randomization range below the -2G memory limit.Does that say "below th negative 2G memory limit"? I don't get it.> > Signed-off-by: Thomas Garnier <thgarnie at google.com> > --- > arch/x86/Makefile | 4 + > arch/x86/include/asm/module.h | 11 ++ > arch/x86/include/asm/sections.h | 4 + > arch/x86/kernel/module.c | 181 +++++++++++++++++++++++++++++++- > arch/x86/kernel/module.lds | 3 + > 5 files changed, 198 insertions(+), 5 deletions(-) > create mode 100644 arch/x86/kernel/module.ldsThanks, -- ~Randy
On 23/05/18 21:54, Thomas Garnier wrote:> Change the assembly code to use the new _ASM_MOVABS macro which get a > symbol reference while being PIE compatible. Adapt the relocation tool > to ignore 32-bit Xen code. > > Position Independent Executable (PIE) support will allow to extended the > KASLR randomization range below the -2G memory limit. > > Signed-off-by: Thomas Garnier <thgarnie at google.com>Reviewed-by: Juergen Gross <jgross at suse.com> Juergen
Pavel Machek
2018-May-24 11:03 UTC
[PATCH v3 09/27] x86/acpi: Adapt assembly for PIE support
On Wed 2018-05-23 12:54:03, Thomas Garnier wrote:> Change the assembly code to use only relative references of symbols for the > kernel to be PIE compatible. > > Position Independent Executable (PIE) support will allow to extended the > KASLR randomization range below the -2G memory limit.What testing did this get?> diff --git a/arch/x86/kernel/acpi/wakeup_64.S b/arch/x86/kernel/acpi/wakeup_64.S > index 50b8ed0317a3..472659c0f811 100644 > --- a/arch/x86/kernel/acpi/wakeup_64.S > +++ b/arch/x86/kernel/acpi/wakeup_64.S > @@ -14,7 +14,7 @@ > * Hooray, we are in Long 64-bit mode (but still running in low memory) > */ > ENTRY(wakeup_long64) > - movq saved_magic, %rax > + movq saved_magic(%rip), %rax > movq $0x123456789abcdef0, %rdx > cmpq %rdx, %rax > jne bogus_64_magicBecause, as comment says, this is rather tricky code. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 181 bytes Desc: Digital signature URL: <http://lists.linuxfoundation.org/pipermail/virtualization/attachments/20180524/a32427da/attachment.sig>
Pavel Machek
2018-May-24 11:03 UTC
[PATCH v3 11/27] x86/power/64: Adapt assembly for PIE support
On Wed 2018-05-23 12:54:05, Thomas Garnier wrote:> Change the assembly code to use only relative references of symbols for the > kernel to be PIE compatible. > > Position Independent Executable (PIE) support will allow to extended the > KASLR randomization range below the -2G memory limit. > > Signed-off-by: Thomas Garnier <thgarnie at google.com>Again, was this tested?> diff --git a/arch/x86/power/hibernate_asm_64.S b/arch/x86/power/hibernate_asm_64.S > index ce8da3a0412c..6fdd7bbc3c33 100644 > --- a/arch/x86/power/hibernate_asm_64.S > +++ b/arch/x86/power/hibernate_asm_64.S > @@ -24,7 +24,7 @@ > #include <asm/frame.h> > > ENTRY(swsusp_arch_suspend) > - movq $saved_context, %rax > + leaq saved_context(%rip), %rax > movq %rsp, pt_regs_sp(%rax) > movq %rbp, pt_regs_bp(%rax) > movq %rsi, pt_regs_si(%rax) > @@ -115,7 +115,7 @@ ENTRY(restore_registers) > movq %rax, %cr4; # turn PGE back on > > /* We don't restore %rax, it must be 0 anyway */ > - movq $saved_context, %rax > + leaq saved_context(%rip), %rax > movq pt_regs_sp(%rax), %rsp > movq pt_regs_bp(%rax), %rbp > movq pt_regs_si(%rax), %rsi-- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 181 bytes Desc: Digital signature URL: <http://lists.linuxfoundation.org/pipermail/virtualization/attachments/20180524/27b893cc/attachment.sig>
Petr Mladek
2018-May-24 11:40 UTC
[PATCH v3 21/27] x86/ftrace: Adapt function tracing for PIE support
On Wed 2018-05-23 12:54:15, Thomas Garnier wrote:> When using -fPIE/PIC with function tracing, the compiler generates a > call through the GOT (call *__fentry__ at GOTPCREL). This instruction > takes 6 bytes instead of 5 on the usual relative call. > > If PIE is enabled, replace the 6th byte of the GOT call by a 1-byte nop > so ftrace can handle the previous 5-bytes as before. > > Position Independent Executable (PIE) support will allow to extended the > KASLR randomization range below the -2G memory limit. > > Signed-off-by: Thomas Garnier <thgarnie at google.com> > --- > arch/x86/include/asm/ftrace.h | 6 +++-- > arch/x86/include/asm/sections.h | 4 ++++ > arch/x86/kernel/ftrace.c | 42 +++++++++++++++++++++++++++++++-- > 3 files changed, 48 insertions(+), 4 deletions(-) > > diff --git a/arch/x86/include/asm/ftrace.h b/arch/x86/include/asm/ftrace.h > index c18ed65287d5..8f2decce38d8 100644 > --- a/arch/x86/include/asm/ftrace.h > +++ b/arch/x86/include/asm/ftrace.h > @@ -25,9 +25,11 @@ extern void __fentry__(void); > static inline unsigned long ftrace_call_adjust(unsigned long addr) > { > /* > - * addr is the address of the mcount call instruction. > - * recordmcount does the necessary offset calculation. > + * addr is the address of the mcount call instruction. PIE has always a > + * byte added to the start of the function. > */ > + if (IS_ENABLED(CONFIG_X86_PIE)) > + addr -= 1;This seems to modify the address even for modules that are _not_ compiled with PIE, see below.> return addr; > } > > diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c > index 01ebcb6f263e..73b3c30cb7a3 100644 > --- a/arch/x86/kernel/ftrace.c > +++ b/arch/x86/kernel/ftrace.c > @@ -135,6 +135,44 @@ ftrace_modify_code_direct(unsigned long ip, unsigned const char *old_code, > return 0; > } > > +/* Bytes before call GOT offset */ > +const unsigned char got_call_preinsn[] = { 0xff, 0x15 }; > + > +static int > +ftrace_modify_initial_code(unsigned long ip, unsigned const char *old_code, > + unsigned const char *new_code) > +{ > + unsigned char replaced[MCOUNT_INSN_SIZE + 1]; > + > + ftrace_expected = old_code; > + > + /* > + * If PIE is not enabled or no GOT call was found, default to the > + * original approach to code modification. > + */ > + if (!IS_ENABLED(CONFIG_X86_PIE) || > + probe_kernel_read(replaced, (void *)ip, sizeof(replaced)) || > + memcmp(replaced, got_call_preinsn, sizeof(got_call_preinsn))) > + return ftrace_modify_code_direct(ip, old_code, new_code);And this looks like an attempt to handle modules compiled without PIE. Does it works with the right ip in that case? I wonder if a better solution would be to update scripts/recordmcount.c to store the incremented location into the module. IMPORTANT: I have only vague picture about how this all works. It is possible that I am completely wrong. The code might be correct, especially if you tested this situation. Best Regards, Petr
Apparently Analagous Threads
- [PATCH] ia64: Fix shared build
- [klibc:master] ia64: Fix shared build
- [lld] RFC: Allow custom sections to be under GNU_RELRO
- [PATCH v4 00/27] x86: PIE support and option to extend KASLR randomization
- [PATCH v5 00/27] x86: PIE support and option to extend KASLR randomization