Messages in this thread | | | From | Dmitry Vyukov <> | Date | Sat, 7 Jul 2018 18:47:22 +0200 | Subject | Re: KASAN: stack-out-of-bounds Read in rb_erase (3) |
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On Sat, Jul 7, 2018 at 5:09 PM, syzbot <syzbot+52ee52c330c2fcdade39@syzkaller.appspotmail.com> wrote: > Hello, > > syzbot found the following crash on: > > HEAD commit: 29119529d8de Merge tag 'for-linus-20180706' of git://git.k.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=16e2550c400000 > kernel config: https://syzkaller.appspot.com/x/.config?x=2ca6c7a31d407f86 > dashboard link: https://syzkaller.appspot.com/bug?extid=52ee52c330c2fcdade39 > compiler: gcc (GCC) 8.0.1 20180413 (experimental) > syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=1463ef48400000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10e481b2400000 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+52ee52c330c2fcdade39@syzkaller.appspotmail.com
#syz dup: KASAN: stack-out-of-bounds Read in timerqueue_add
> random: sshd: uninitialized urandom read (32 bytes read) > random: sshd: uninitialized urandom read (32 bytes read) > random: sshd: uninitialized urandom read (32 bytes read) > random: sshd: uninitialized urandom read (32 bytes read) > ================================================================== > BUG: KASAN: stack-out-of-bounds in ____rb_erase_color lib/rbtree.c:258 > [inline] > BUG: KASAN: stack-out-of-bounds in rb_erase+0x19e9/0x3550 lib/rbtree.c:462 > Read of size 8 at addr ffff8801c2dd7718 by task syz-executor396/4530 > > CPU: 1 PID: 4530 Comm: syz-executor396 Not tainted 4.18.0-rc3+ #134 > 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 > ____rb_erase_color lib/rbtree.c:258 [inline] > rb_erase+0x19e9/0x3550 lib/rbtree.c:462 > timerqueue_del+0x86/0x150 lib/timerqueue.c:87 > __remove_hrtimer+0xa8/0x1b0 kernel/time/hrtimer.c:984 > __run_hrtimer kernel/time/hrtimer.c:1380 [inline] > __hrtimer_run_queues+0x369/0x10c0 kernel/time/hrtimer.c:1460 > hrtimer_interrupt+0x2f3/0x750 kernel/time/hrtimer.c:1518 > local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1025 [inline] > smp_apic_timer_interrupt+0x165/0x730 arch/x86/kernel/apic/apic.c:1050 > apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:863 > </IRQ> > > The buggy address belongs to the page: > page:ffffea00070b75c0 count:0 mapcount:0 mapping:0000000000000000 index:0x0 > flags: 0x2fffc0000000000() > raw: 02fffc0000000000 0000000000000000 ffffffff070b0101 0000000000000000 > raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 > page dumped because: kasan: bad access detected > > Memory state around the buggy address: > ffff8801c2dd7600: f2 f2 f2 f2 f2 f2 f2 00 f2 f2 f2 00 00 00 00 00 > ffff8801c2dd7680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >> >> ffff8801c2dd7700: f1 f1 f1 f1 00 f2 f2 f2 f2 f2 f2 f2 00 f2 f2 f2 > > ^ > ffff8801c2dd7780: f2 f2 f2 f2 00 f2 f2 f2 f2 f2 f2 f2 f8 f2 f2 f2 > ffff8801c2dd7800: f2 f2 f2 f2 00 f2 f2 f2 00 00 00 00 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@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@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/syzkaller-bugs/00000000000025545a05706a29d4%40google.com. > For more options, visit https://groups.google.com/d/optout.
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