Messages in this thread | | | Date | Wed, 11 Apr 2018 05:02:02 -0700 | Subject | KASAN: stack-out-of-bounds Read in __free_filter | From | syzbot <> |
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Hello,
syzbot hit the following crash on upstream commit b284d4d5a6785f8cd07eda2646a95782373cd01e (Tue Apr 10 19:25:30 2018 +0000) Merge tag 'ceph-for-4.17-rc1' of git://github.com/ceph/ceph-client syzbot dashboard link: https://syzkaller.appspot.com/bug?extid=dadcc936587643d7f568
So far this crash happened 6 times on upstream. C reproducer: https://syzkaller.appspot.com/x/repro.c?id=6547381214511104 syzkaller reproducer: https://syzkaller.appspot.com/x/repro.syz?id=5485642750361600 Raw console output: https://syzkaller.appspot.com/x/log.txt?id=5352489637380096 Kernel config: https://syzkaller.appspot.com/x/.config?id=-1223000601505858474 compiler: gcc (GCC) 8.0.1 20180301 (experimental)
IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+dadcc936587643d7f568@syzkaller.appspotmail.com It will help syzbot understand when the bug is fixed. See footer for details. If you forward the report, please keep this part and the footer.
RDX: 000000002099aff9 RSI: 0000000040082406 RDI: 0000000000000003 RBP: 00000000006cb018 R08: 0000000000000001 R09: 00007ffe76420032 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 R13: ffffffffffffffff R14: 0000000000000000 R15: 0000000000000000 ================================================================== BUG: KASAN: stack-out-of-bounds in __read_once_size include/linux/compiler.h:188 [inline] BUG: KASAN: stack-out-of-bounds in free_prog kernel/trace/trace_events_filter.c:988 [inline] BUG: KASAN: stack-out-of-bounds in __free_filter.part.6+0x1ac/0x1d0 kernel/trace/trace_events_filter.c:1012 Read of size 8 at addr ffff8801b2cd7698 by task syzkaller788882/4452
CPU: 0 PID: 4452 Comm: syzkaller788882 Not tainted 4.16.0+ #17 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1b9/0x294 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+0xac/0x2f5 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] free_prog kernel/trace/trace_events_filter.c:988 [inline] __free_filter.part.6+0x1ac/0x1d0 kernel/trace/trace_events_filter.c:1012 __free_filter kernel/trace/trace_events_filter.c:1009 [inline] ftrace_profile_set_filter+0x159/0x2b0 kernel/trace/trace_events_filter.c:2053 perf_event_set_filter+0x248/0x1230 kernel/events/core.c:9064 _perf_ioctl+0x84c/0x1650 kernel/events/core.c:5056 perf_ioctl+0x59/0x80 kernel/events/core.c:5107 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x1cf/0x1650 fs/ioctl.c:684 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:701 SYSC_ioctl fs/ioctl.c:708 [inline] SyS_ioctl+0x24/0x30 fs/ioctl.c:706 do_syscall_64+0x29e/0x9d0 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x440519 RSP: 002b:00007ffe7642b3a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000440519 RDX: 000000002099aff9 RSI: 0000000040082406 RDI: 0000000000000003 RBP: 00000000006cb018 R08: 0000000000000001 R09: 00007ffe76420032 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 R13: ffffffffffffffff R14: 0000000000000000 R15: 0000000000000000
The buggy address belongs to the page: page:ffffea0006cb35c0 count:0 mapcount:0 mapping:0000000000000000 index:0x0 flags: 0x2fffc0000000000() raw: 02fffc0000000000 0000000000000000 0000000000000000 00000000ffffffff raw: 0000000000000000 ffffea0006cb0101 0000000000000000 0000000000000000 page dumped because: kasan: bad access detected
Memory state around the buggy address: ffff8801b2cd7580: 00 00 00 00 00 00 00 f1 f1 f1 f1 00 f2 f2 f2 f3 ffff8801b2cd7600: f3 f3 f3 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 > ffff8801b2cd7680: f1 00 f2 f2 f2 f3 f3 f3 f3 00 00 00 00 00 00 00 ^ ffff8801b2cd7700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 ffff8801b2cd7780: f1 f1 00 f2 f2 f2 f2 f2 f2 f2 00 f2 f2 f2 f2 f2 ==================================================================
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