Re: BUG: unable to handle kernel NULL pointer dereference in corrupted

[Dmitry Vyukov]

On Fri, Jun 8, 2018 at 3:11 PM, syzbot
<syzbot+f5066e369b2d5fff630f@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit:    68abbe729567 Merge branch 'akpm' (patches from Andrew)
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=16f7cebf800000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=e5a4673d4582131c
> dashboard link: https://syzkaller.appspot.com/bug?extid=f5066e369b2d5fff630f
> compiler:       gcc (GCC) 8.0.1 20180413 (experimental)
> syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=1191756f800000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=162236af800000

The reproducer suggests that this is in smc.
+smc maintainers

> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+f5066e369b2d5fff630f@xxxxxxxxxxxxxxxxxxxxxxxxx
>
> 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)
> random: sshd: uninitialized urandom read (32 bytes read)
> BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
> PGD 1b51e5067 P4D 1b51e5067 PUD 1b508f067 PMD 0
> Oops: 0010 [#1] SMP KASAN
> CPU: 1 PID: 4485 Comm: syz-executor452 Not tainted 4.17.0+ #90
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> RIP: 0010:          (null)
> Code: Bad RIP value.
> RSP: 0018:ffff8801b6f273a0 EFLAGS: 00010246
> RAX: 0000000000000000 RBX: ffff8801b629b800 RCX: 1ffffffff10ea805
> RDX: ffff8801b6f27c00 RSI: ffff8801ae67a100 RDI: ffff8801b51feac0
> RBP: ffff8801b6f27510 R08: ffff8801b563cf78 R09: 0000000000000006
> R10: ffff8801b563c740 R11: 0000000000000000 R12: 1ffff10036de4e79
> R13: ffff8801b6f27c00 R14: ffff8801b629b812 R15: ffff8801b629bc58
> FS:  0000000001c2b880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: ffffffffffffffd6 CR3: 00000001b5625000 CR4: 00000000001406e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>  sock_poll+0x1d1/0x710 net/socket.c:1156
>  vfs_poll+0x77/0x2a0 fs/select.c:40
>  ep_item_poll.isra.15+0x2c1/0x390 fs/eventpoll.c:887
>  ep_insert+0x6b8/0x1c00 fs/eventpoll.c:1459
>  __do_sys_epoll_ctl fs/eventpoll.c:2113 [inline]
>  __se_sys_epoll_ctl fs/eventpoll.c:1999 [inline]
>  __x64_sys_epoll_ctl+0xef1/0x10f0 fs/eventpoll.c:1999
>  do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
>  entry_SYSCALL_64_after_hwframe+0x49/0xbe
> RIP: 0033:0x43fcc9
> Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7
> 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff
> 0f 83 6b 45 00 00 c3 66 2e 0f 1f 84 00 00 00 00
> RSP: 002b:00007fff59e3a2f8 EFLAGS: 00000217 ORIG_RAX: 00000000000000e9
> RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fcc9
> RDX: 0000000000000003 RSI: 0000000000000001 RDI: 0000000000000004
> RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8
> R10: 0000000020000000 R11: 0000000000000217 R12: 00000000004015f0
> R13: 0000000000401680 R14: 0000000000000000 R15: 0000000000000000
> Modules linked in:
> Dumping ftrace buffer:
>    (ftrace buffer empty)
> CR2: 0000000000000000
> ---[ end trace 090a30b2125a99a3 ]---
> RIP: 0010:          (null)
> Code: Bad RIP value.
> RSP: 0018:ffff8801b6f273a0 EFLAGS: 00010246
> RAX: 0000000000000000 RBX: ffff8801b629b800 RCX: 1ffffffff10ea805
> RDX: ffff8801b6f27c00 RSI: ffff8801ae67a100 RDI: ffff8801b51feac0
> RBP: ffff8801b6f27510 R08: ffff8801b563cf78 R09: 0000000000000006
> R10: ffff8801b563c740 R11: 0000000000000000 R12: 1ffff10036de4e79
> R13: ffff8801b6f27c00 R14: ffff8801b629b812 R15: ffff8801b629bc58
> FS:  0000000001c2b880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: ffffffffffffffd6 CR3: 00000001b5625000 CR4: 00000000001406e0
> 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@xxxxxxxxxxxxxxxxx
>
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> syzbot can test patches for this bug, for details see:
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>
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