search for: shn_undef

This adds [f]getc() and fgets() for parsing config files. Probably hard to avoid. Still trying to decide if I actually want to add system() or not. -hpa

...addr +=3D VDSO_HIGH_BASE; + if (strcmp(secstrings+sechdrs[i].sh_name, ".dynsym") =3D=3D 0) { + Elf32_Sym *sym =3D (void *)hdr + sechdrs[i].sh_offset; + n =3D sechdrs[i].sh_size / sizeof(*sym); + for (j =3D 1; j < n; j++) { + int ndx =3D sym[j].st_shndx; + if (ndx =3D=3D SHN_UNDEF || ndx =3D=3D SHN_ABS) + continue; + sym[j].st_value +=3D VDSO_HIGH_BASE; + } + } else if (strcmp(secstrings+sechdrs[i].sh_name, ".dynamic") =3D=3D 0) { + Elf32_Dyn *dyn =3D (void *)hdr + sechdrs[i].sh_offset; + int tag; + while ((tag =3D (++dyn)->d_tag) !=3D DT_NULL) +...

...addr +=3D VDSO_HIGH_BASE; + if (strcmp(secstrings+sechdrs[i].sh_name, ".dynsym") =3D=3D 0) { + Elf32_Sym *sym =3D (void *)hdr + sechdrs[i].sh_offset; + n =3D sechdrs[i].sh_size / sizeof(*sym); + for (j =3D 1; j < n; j++) { + int ndx =3D sym[j].st_shndx; + if (ndx =3D=3D SHN_UNDEF || ndx =3D=3D SHN_ABS) + continue; + sym[j].st_value +=3D VDSO_HIGH_BASE; + } + } else if (strcmp(secstrings+sechdrs[i].sh_name, ".dynamic") =3D=3D 0) { + Elf32_Dyn *dyn =3D (void *)hdr + sechdrs[i].sh_offset; + int tag; + while ((tag =3D (++dyn)->d_tag) !=3D DT_NULL) +...

...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 *...

...= e64_hdr.e_phoff; + phnum = e64_hdr.e_phnum; + phentsize = e64_hdr.e_phentsize; } else { fprintf(stderr, "Unsupported architecture\n"); exit(EXIT_FAILURE); @@ -234,98 +226,47 @@ int main(int argc, char **argv) exit(EXIT_FAILURE); } - if (!shoff || !shnum || (shstrndx == SHN_UNDEF)) { - fprintf(stderr, "Cannot find section table\n"); + if (!phoff || !phnum) { + fprintf(stderr, "Cannot find segment table\n"); exit(EXIT_FAILURE); } /* - * Find the beginning of the .bss section. Everything preceding - * it is copied verbatim to the output file....

...= e64_hdr.e_phoff; + phnum = e64_hdr.e_phnum; + phentsize = e64_hdr.e_phentsize; } else { fprintf(stderr, "Unsupported architecture\n"); exit(EXIT_FAILURE); @@ -230,98 +222,47 @@ int main(int argc, char **argv) exit(EXIT_FAILURE); } - if (!shoff || !shnum || (shstrndx == SHN_UNDEF)) { - fprintf(stderr, "Cannot find section table\n"); + if (!phoff || !phnum) { + fprintf(stderr, "Cannot find segment table\n"); exit(EXIT_FAILURE); } /* - * Find the beginning of the .bss section. Everything preceding - * it is copied verbatim to the output file....

Create a configurable hole in the linear address space at the top of memory. A more advanced interface is needed to negotiate how much space the hypervisor is allowed to steal, but in the end, it seems most likely that a fixed constant size will be chosen for the compiled kernel, potentially propagated to an information page used by paravirtual initialization to determine interface compatibility.

Create a configurable hole in the linear address space at the top of memory. A more advanced interface is needed to negotiate how much space the hypervisor is allowed to steal, but in the end, it seems most likely that a fixed constant size will be chosen for the compiled kernel, potentially propagated to an information page used by paravirtual initialization to determine interface compatibility.

The PE headers of the generated efi file were quite buggy. And since OVMF perform a few consistency checks, syslinux was unable to run on it. I don't pretend to have a thorough understanding of the PE+ headers, some bugs may remain. :) Celelibi (4): efi: Fix PE header field rva_and_sizes_nr efi: Location, size and alignment of .text section efi: Useless relocations in PE file efi: PE

...+=3D VSYSCALL_RELOCATION; + if (strcmp(secstrings+sechdrs[i].sh_name, ".dynsym") =3D=3D 0) { + Elf32_Sym *sym =3D (void *)hdr + sechdrs[i].sh_offset; + n =3D sechdrs[i].sh_size / sizeof(*sym); + for (j =3D 1; j < n; j++) { + int ndx =3D sym[j].st_shndx; + if (ndx =3D=3D SHN_UNDEF || ndx =3D=3D SHN_ABS) + continue; + sym[j].st_value +=3D VSYSCALL_RELOCATION; + } + } else if (strcmp(secstrings+sechdrs[i].sh_name, ".dynamic") =3D=3D 0) { + Elf32_Dyn *dyn =3D (void *)hdr + sechdrs[i].sh_offset; + int tag; + while ((tag =3D (++dyn)->d_tag) !=3D DT_NU...

...+=3D VSYSCALL_RELOCATION; + if (strcmp(secstrings+sechdrs[i].sh_name, ".dynsym") =3D=3D 0) { + Elf32_Sym *sym =3D (void *)hdr + sechdrs[i].sh_offset; + n =3D sechdrs[i].sh_size / sizeof(*sym); + for (j =3D 1; j < n; j++) { + int ndx =3D sym[j].st_shndx; + if (ndx =3D=3D SHN_UNDEF || ndx =3D=3D SHN_ABS) + continue; + sym[j].st_value +=3D VSYSCALL_RELOCATION; + } + } else if (strcmp(secstrings+sechdrs[i].sh_name, ".dynamic") =3D=3D 0) { + Elf32_Dyn *dyn =3D (void *)hdr + sechdrs[i].sh_offset; + int tag; + while ((tag =3D (++dyn)->d_tag) !=3D DT_NU...

...d(elf_fd, strtab, sec[sec[i].sh_link].sh_size); + if (ret != sec[sec[i].sh_link].sh_size) + err(1, "Reading string table"); + break; + } + } + + /* We now have a pointer to the symtab, start searching for the symbol */ + for (i = 0; i < nsyms; i++) { + if ((syms[i].st_shndx == SHN_UNDEF) || !syms[i].st_name) + continue; + if (!strcmp("boot_level4_pgt", + (char *)((u64)syms[i].st_name + strtab))) { + *pgdir_addr = syms[i].st_value - *page_offset; + break; + } + } + + if (!*pgdir_addr) + err(1,"Unable to find boot pgdir"); + + *ird_size = load_initrd(...

...d(elf_fd, strtab, sec[sec[i].sh_link].sh_size); + if (ret != sec[sec[i].sh_link].sh_size) + err(1, "Reading string table"); + break; + } + } + + /* We now have a pointer to the symtab, start searching for the symbol */ + for (i = 0; i < nsyms; i++) { + if ((syms[i].st_shndx == SHN_UNDEF) || !syms[i].st_name) + continue; + if (!strcmp("boot_level4_pgt", + (char *)((u64)syms[i].st_name + strtab))) { + *pgdir_addr = syms[i].st_value - *page_offset; + break; + } + } + + if (!*pgdir_addr) + err(1,"Unable to find boot pgdir"); + + *ird_size = load_initrd(...

Hi Andi, Four patches: - clean up asm/bugs.h, by moving all the C code into its own C file - split identify_cpu() into boot and secondary variants, so that boot-time setup functions can be marked __init - repost of the COMPAT_VDSO patches with a bit more robustness from unknown DT_tags, and functions marked __init, since all this is boot-time only setup. Thanks, J --

Hi Andi, Four patches: - clean up asm/bugs.h, by moving all the C code into its own C file - split identify_cpu() into boot and secondary variants, so that boot-time setup functions can be marked __init - repost of the COMPAT_VDSO patches with a bit more robustness from unknown DT_tags, and functions marked __init, since all this is boot-time only setup. Thanks, J --

From: Matt Fleming <matt.fleming at intel.com> Since we can't use __intcall() for EFI, and since we can now have the ELF module code resolve all our symbols at runtime, we should delete as many references to __intcall() as possible and just access the symbols directly. The most interesting patch is the support for weak symbols. We need to be able to reference derivative-specific

...crt_name = module->str_table + crt_sym->st_name; strong_count = 0; - weak_count = 0; + weak_count = (ELF32_ST_BIND(crt_sym->st_info) == STB_WEAK); for_each_module(crt_module) { @@ -345,6 +345,14 @@ int check_symbols(struct elf_module *module) if (crt_sym->st_shndx == SHN_UNDEF) { // We have an undefined symbol + // + // We use the weak_count to differentiate + // between Syslinux-derivative-specific + // functions. For example, unload_pxe() is + // only provided by PXELINUX, so we mark it as + // __weak and replace it with a reference to + // undefin...

...d(elf_fd, strtab, sec[sec[i].sh_link].sh_size); + if (ret != sec[sec[i].sh_link].sh_size) + err(1, "Reading string table"); + break; + } + } + + /* We now have a pointer to the symtab, start searching for the symbol */ + for (i = 0; i < nsyms; i++) { + if ((syms[i].st_shndx == SHN_UNDEF) || !syms[i].st_name) + continue; + if (!strcmp("boot_level4_pgt", + (char *)((u64)syms[i].st_name + strtab))) { + *pgdir_addr = syms[i].st_value - *page_offset; + break; + } + } + + if (!*pgdir_addr) + err(1,"Unable to find boot pgdir"); + + *ird_size = load_initrd(...

...d(elf_fd, strtab, sec[sec[i].sh_link].sh_size); + if (ret != sec[sec[i].sh_link].sh_size) + err(1, "Reading string table"); + break; + } + } + + /* We now have a pointer to the symtab, start searching for the symbol */ + for (i = 0; i < nsyms; i++) { + if ((syms[i].st_shndx == SHN_UNDEF) || !syms[i].st_name) + continue; + if (!strcmp("boot_level4_pgt", + (char *)((u64)syms[i].st_name + strtab))) { + *pgdir_addr = syms[i].st_value - *page_offset; + break; + } + } + + if (!*pgdir_addr) + err(1,"Unable to find boot pgdir"); + + *ird_size = load_initrd(...

Changes: - 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