Dmitry Vyukov
2018-Jul-05 16:18 UTC
KASAN: stack-out-of-bounds Read in __netif_receive_skb_core
On Thu, Jul 5, 2018 at 6:59 AM, syzbot <syzbot+4e955f82549d361ed655 at syzkaller.appspotmail.com> wrote:> Hello, > > syzbot found the following crash on: > > HEAD commit: 2bdea157b999 Merge branch 'sctp-fully-support-for-dscp-and.. > git tree: bpf-next > console output: https://syzkaller.appspot.com/x/log.txt?x=178c5e68400000 > kernel config: https://syzkaller.appspot.com/x/.config?x=f62553dc846b0692 > dashboard link: https://syzkaller.appspot.com/bug?extid=4e955f82549d361ed655 > compiler: gcc (GCC) 8.0.1 20180413 (experimental) > syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=15038ad0400000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1465b670400000 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+4e955f82549d361ed655 at syzkaller.appspotmail.com#syz dup: KASAN: stack-out-of-bounds Read in timerqueue_add> =================================================================> BUG: KASAN: stack-out-of-bounds in __read_once_size > include/linux/compiler.h:188 [inline] > BUG: KASAN: stack-out-of-bounds in __netif_receive_skb_core+0x2e09/0x3680 > net/core/dev.c:4657 > Read of size 8 at addr ffff8801a852d1e8 by task swapper/0/0 > > CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.18.0-rc3+ #45 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Call Trace: > <IRQ> > __dump_stack lib/dump_stack.c:77 [inline] > dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113 > print_address_description+0x6c/0x20b mm/kasan/report.c:256 > kasan_report_error mm/kasan/report.c:354 [inline] > kasan_report.cold.7+0x242/0x2fe mm/kasan/report.c:412 > __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 > __read_once_size include/linux/compiler.h:188 [inline] > __netif_receive_skb_core+0x2e09/0x3680 net/core/dev.c:4657 > __netif_receive_skb+0x2c/0x1e0 net/core/dev.c:4807 > netif_receive_skb_internal+0x12e/0x680 net/core/dev.c:4881 > napi_skb_finish net/core/dev.c:5270 [inline] > napi_gro_receive+0x465/0x5c0 net/core/dev.c:5301 > receive_buf+0xc97/0x2bf0 drivers/net/virtio_net.c:996 > virtnet_receive drivers/net/virtio_net.c:1252 [inline] > virtnet_poll+0x3d5/0xe3d drivers/net/virtio_net.c:1334 > napi_poll net/core/dev.c:5926 [inline] > net_rx_action+0x7a5/0x1950 net/core/dev.c:5992 > __do_softirq+0x2e8/0xb17 kernel/softirq.c:288 > invoke_softirq kernel/softirq.c:368 [inline] > irq_exit+0x1d1/0x200 kernel/softirq.c:408 > exiting_irq arch/x86/include/asm/apic.h:527 [inline] > do_IRQ+0xf1/0x190 arch/x86/kernel/irq.c:257 > common_interrupt+0xf/0xf arch/x86/entry/entry_64.S:642 > </IRQ> > RIP: 0010:native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54 > Code: c7 48 89 45 d8 e8 7a b1 25 fa 48 8b 45 d8 e9 d2 fe ff ff 48 89 df e8 > 69 b1 25 fa eb 8a 90 90 90 90 90 90 90 55 48 89 e5 fb f4 <5d> c3 0f 1f 84 00 > 00 00 00 00 55 48 89 e5 f4 5d c3 90 90 90 90 90 > RSP: 0018:ffffffff88e07bc0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffffd9 > RAX: dffffc0000000000 RBX: 1ffffffff11c0f7b RCX: ffffffff81667982 > RDX: 1ffffffff11e3610 RSI: 0000000000000004 RDI: ffffffff88f1b080 > RBP: ffffffff88e07bc0 R08: ffffed003b5c46d7 R09: ffffed003b5c46d6 > R10: ffffed003b5c46d6 R11: ffff8801dae236b3 R12: 0000000000000000 > R13: ffffffff88e07c78 R14: ffffffff899ebe60 R15: 0000000000000000 > arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline] > default_idle+0xc7/0x450 arch/x86/kernel/process.c:500 > arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:491 > default_idle_call+0x6d/0x90 kernel/sched/idle.c:93 > cpuidle_idle_call kernel/sched/idle.c:153 [inline] > do_idle+0x3aa/0x570 kernel/sched/idle.c:262 > cpu_startup_entry+0x10c/0x120 kernel/sched/idle.c:368 > rest_init+0xe1/0xe4 init/main.c:442 > start_kernel+0x90e/0x949 init/main.c:738 > x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:452 > x86_64_start_kernel+0x76/0x79 arch/x86/kernel/head64.c:433 > secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:242 > > Allocated by task 0: > (stack is not available) > > Freed by task 0: > (stack is not available) > > The buggy address belongs to the object at ffff8801a852ca80 > which belongs to the cache kmalloc-2048 of size 2048 > The buggy address is located 1896 bytes inside of > 2048-byte region [ffff8801a852ca80, ffff8801a852d280) > The buggy address belongs to the page: > page:ffffea0006a14b00 count:1 mapcount:0 mapping:ffff8801da800c40 index:0x0 > compound_mapcount: 0 > flags: 0x2fffc0000008100(slab|head) > raw: 02fffc0000008100 ffffea0006c6bd08 ffffea0006c7f688 ffff8801da800c40 > raw: 0000000000000000 ffff8801a852c200 0000000100000003 0000000000000000 > page dumped because: kasan: bad access detected > > Memory state around the buggy address: > ffff8801a852d080: f2 f2 f2 f8 f2 f2 f2 f2 f2 f2 f2 00 f2 f2 f2 00 > ffff8801a852d100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >> >> ffff8801a852d180: 00 00 00 00 f1 f1 f1 f1 00 f2 f2 f2 f2 f2 f2 f2 > > ^ > ffff8801a852d200: 00 f2 f2 f2 f2 f2 f2 f2 00 f2 f2 f2 f2 f2 f2 f2 > ffff8801a852d280: f8 f2 f2 f2 f2 f2 f2 f2 00 f2 f2 f2 00 00 00 00 > =================================================================> > > --- > This bug is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller at googlegroups.com. > > syzbot will keep track of this bug report. See: > https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with > syzbot. > syzbot can test patches for this bug, for details see: > https://goo.gl/tpsmEJ#testing-patches > > -- > You received this message because you are subscribed to the Google Groups > "syzkaller-bugs" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to syzkaller-bugs+unsubscribe at googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/syzkaller-bugs/000000000000ea6148057039671d%40google.com. > For more options, visit https://groups.google.com/d/optout.