Messages in this thread | | | Date | Fri, 21 Jun 2019 09:27:05 -0700 | Subject | KASAN: slab-out-of-bounds Write in validate_chain | From | syzbot <> |
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Hello,
syzbot found the following crash on:
HEAD commit: abf02e29 Merge tag 'pm-5.2-rc6' of git://git.kernel.org/pu.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16894709a00000 kernel config: https://syzkaller.appspot.com/x/.config?x=28ec3437a5394ee0 dashboard link: https://syzkaller.appspot.com/bug?extid=8893700724999566d6a9 compiler: clang version 9.0.0 (/home/glider/llvm/clang 80fee25776c2fb61e74c1ecb1a523375c2500b69) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=167098b2a00000
IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+8893700724999566d6a9@syzkaller.appspotmail.com
================================================================== BUG: KASAN: slab-out-of-bounds in check_prev_add kernel/locking/lockdep.c:2298 [inline] BUG: KASAN: slab-out-of-bounds in check_prevs_add kernel/locking/lockdep.c:2418 [inline] BUG: KASAN: slab-out-of-bounds in validate_chain+0x1a35/0x84f0 kernel/locking/lockdep.c:2800 Write of size 8 at addr ffff88807aeb00d0 by task syz-executor.5/8425
CPU: 0 PID: 8425 Comm: syz-executor.5 Not tainted 5.2.0-rc5+ #4 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace:
Allocated by task 2062228080: usercopy: Kernel memory overwrite attempt detected to SLAB object 'kmalloc-4k' (offset 4112, size 1)! ------------[ cut here ]------------ kernel BUG at mm/usercopy.c:102! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 8425 Comm: syz-executor.5 Not tainted 5.2.0-rc5+ #4 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:usercopy_abort+0x8d/0x90 mm/usercopy.c:90 Code: 84 5e 88 48 0f 44 de 48 c7 c7 7e a3 5d 88 4c 89 ce 4c 89 d1 4d 89 d8 49 89 c1 31 c0 41 57 41 56 53 e8 3a 92 a8 ff 48 83 c4 18 <0f> 0b 90 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 ec 30 41 89 RSP: 0018:ffff88807aeaf648 EFLAGS: 00010086 RAX: 0000000000000068 RBX: ffffffff885e841b RCX: defe62446f204b00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffff88807aeaf660 R08: ffffffff817fec49 R09: ffffed1015d444c6 R10: ffffed1015d444c6 R11: 1ffff11015d444c5 R12: ffff88807aeaf7d1 R13: 0000000000000200 R14: 0000000000001010 R15: 0000000000000001 FS: 0000555556495940(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffff8adaea30 CR3: 00000000a0d73000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: Modules linked in: ---[ end trace e8702886173758cd ]--- RIP: 0010:usercopy_abort+0x8d/0x90 mm/usercopy.c:90 Code: 84 5e 88 48 0f 44 de 48 c7 c7 7e a3 5d 88 4c 89 ce 4c 89 d1 4d 89 d8 49 89 c1 31 c0 41 57 41 56 53 e8 3a 92 a8 ff 48 83 c4 18 <0f> 0b 90 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 ec 30 41 89 RSP: 0018:ffff88807aeaf648 EFLAGS: 00010086 RAX: 0000000000000068 RBX: ffffffff885e841b RCX: defe62446f204b00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffff88807aeaf660 R08: ffffffff817fec49 R09: ffffed1015d444c6 R10: ffffed1015d444c6 R11: 1ffff11015d444c5 R12: ffff88807aeaf7d1 R13: 0000000000000200 R14: 0000000000001010 R15: 0000000000000001 FS: 0000555556495940(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffff8adaea30 CR3: 00000000a0d73000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
--- 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.
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