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From: Dmitry Vyukov <dvyukov@google.com>
To: syzbot <syzbot+f9704d1878e290eddf73@syzkaller.appspotmail.com>,
	Jens Axboe <axboe@kernel.dk>,
	Pavel Begunkov <asml.silence@gmail.com>,
	io-uring@vger.kernel.org
Cc: andrii@kernel.org, ast@kernel.org, bpf@vger.kernel.org,
	daniel@iogearbox.net, davem@davemloft.net,
	john.fastabend@gmail.com, kafai@fb.com, kpsingh@kernel.org,
	kuba@kernel.org, linux-kernel@vger.kernel.org,
	netdev@vger.kernel.org, songliubraving@fb.com,
	syzkaller-bugs@googlegroups.com, yhs@fb.com
Subject: Re: [syzbot] general protection fault in sock_from_file
Date: Mon, 30 Aug 2021 21:22:34 +0200	[thread overview]
Message-ID: <CACT4Y+a9gTY4Mr=UsGiNGL7oXDc5dtV6-WXf2fC_vP5dDdGXRQ@mail.gmail.com> (raw)
In-Reply-To: <00000000000011360d05cacbb622@google.com>

On Mon, 30 Aug 2021 at 21:19, syzbot
<syzbot+f9704d1878e290eddf73@syzkaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit:    93717cde744f Add linux-next specific files for 20210830
> git tree:       linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=15b851fe300000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=c643ef5289990dd1
> dashboard link: https://syzkaller.appspot.com/bug?extid=f9704d1878e290eddf73
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1
>
> Unfortunately, I don't have any reproducer for this issue yet.
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+f9704d1878e290eddf73@syzkaller.appspotmail.com

+io_uring maintainers as this looks io_uring-related

> general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] PREEMPT SMP KASAN
> KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]
> CPU: 1 PID: 6072 Comm: syz-executor.0 Not tainted 5.14.0-next-20210830-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
> RIP: 0010:sock_from_file+0x20/0x90 net/socket.c:505
> Code: f5 ff ff ff c3 0f 1f 44 00 00 41 54 53 48 89 fb e8 85 e9 62 fa 48 8d 7b 28 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 4f 45 31 e4 48 81 7b 28 80 f1 8a 8a 74 0c e8 58 e9
> RSP: 0018:ffffc9000a2df8e8 EFLAGS: 00010206
> RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90002f91000
> RDX: 0000000000000005 RSI: ffffffff8713203b RDI: 0000000000000028
> RBP: ffff8880983c2c80 R08: ffffffff899aee40 R09: ffffffff81e21978
> R10: 0000000000000027 R11: 0000000000000009 R12: dffffc0000000000
> R13: 1ffff11013078599 R14: 0000000000000003 R15: ffff8880983c2c80
> FS:  00007fe7b0454700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00005591dffa5180 CR3: 00000000974cb000 CR4: 00000000001506e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>  io_sendmsg+0x98/0x640 fs/io_uring.c:4681
>  io_issue_sqe+0x14de/0x6ba0 fs/io_uring.c:6578
>  __io_queue_sqe+0x90/0xb50 fs/io_uring.c:6864
>  io_req_task_submit+0xbf/0x1b0 fs/io_uring.c:2218
>  tctx_task_work+0x166/0x610 fs/io_uring.c:2143
>  task_work_run+0xdd/0x1a0 kernel/task_work.c:164
>  tracehook_notify_signal include/linux/tracehook.h:212 [inline]
>  handle_signal_work kernel/entry/common.c:146 [inline]
>  exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
>  exit_to_user_mode_prepare+0x256/0x290 kernel/entry/common.c:209
>  __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
>  syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302
>  do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
>  entry_SYSCALL_64_after_hwframe+0x44/0xae
> RIP: 0033:0x4665f9
> Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
> RSP: 002b:00007fe7b0454188 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
> RAX: 0000000000001000 RBX: 000000000056bf80 RCX: 00000000004665f9
> RDX: 0000000000000000 RSI: 000000000000688c RDI: 0000000000000003
> RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
> R13: 00007fffeee6585f R14: 00007fe7b0454300 R15: 0000000000022000
> Modules linked in:
> ---[ end trace 6f9e359dd487b8fa ]---
> RIP: 0010:sock_from_file+0x20/0x90 net/socket.c:505
> Code: f5 ff ff ff c3 0f 1f 44 00 00 41 54 53 48 89 fb e8 85 e9 62 fa 48 8d 7b 28 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 4f 45 31 e4 48 81 7b 28 80 f1 8a 8a 74 0c e8 58 e9
> RSP: 0018:ffffc9000a2df8e8 EFLAGS: 00010206
> RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90002f91000
> RDX: 0000000000000005 RSI: ffffffff8713203b RDI: 0000000000000028
> RBP: ffff8880983c2c80 R08: ffffffff899aee40 R09: ffffffff81e21978
> R10: 0000000000000027 R11: 0000000000000009 R12: dffffc0000000000
> R13: 1ffff11013078599 R14: 0000000000000003 R15: ffff8880983c2c80
> FS:  00007fe7b0454700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007fb81002c710 CR3: 00000000974cb000 CR4: 00000000001506e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> ----------------
> Code disassembly (best guess), 3 bytes skipped:
>    0:   ff c3                   inc    %ebx
>    2:   0f 1f 44 00 00          nopl   0x0(%rax,%rax,1)
>    7:   41 54                   push   %r12
>    9:   53                      push   %rbx
>    a:   48 89 fb                mov    %rdi,%rbx
>    d:   e8 85 e9 62 fa          callq  0xfa62e997
>   12:   48 8d 7b 28             lea    0x28(%rbx),%rdi
>   16:   48 b8 00 00 00 00 00    movabs $0xdffffc0000000000,%rax
>   1d:   fc ff df
>   20:   48 89 fa                mov    %rdi,%rdx
>   23:   48 c1 ea 03             shr    $0x3,%rdx
> * 27:   80 3c 02 00             cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
>   2b:   75 4f                   jne    0x7c
>   2d:   45 31 e4                xor    %r12d,%r12d
>   30:   48 81 7b 28 80 f1 8a    cmpq   $0xffffffff8a8af180,0x28(%rbx)
>   37:   8a
>   38:   74 0c                   je     0x46
>   3a:   e8                      .byte 0xe8
>   3b:   58                      pop    %rax
>   3c:   e9                      .byte 0xe9
>
>
> ---
> This report 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 issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
>
> --
> 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/00000000000011360d05cacbb622%40google.com.

  reply	other threads:[~2021-08-30 19:22 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-30 19:19 syzbot
2021-08-30 19:22 ` Dmitry Vyukov [this message]
2021-08-30 20:45 ` syzbot
2021-08-31  2:14   ` Jens Axboe
2021-08-31  9:19     ` Hao Xu
2021-08-31  9:42       ` Pavel Begunkov
2021-08-31 11:05         ` Hao Xu
2021-08-31 11:26           ` Pavel Begunkov
2021-08-31 11:48             ` Hao Xu
2021-08-31 11:50               ` Pavel Begunkov

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