linux-kernel - Re: general protection fault in io_uring

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Message-ID: <f45bb2df-5ef0-bc36-8afb-2c03257cc2c1@gmail.com>
Date:   Thu, 14 Jan 2021 21:05:53 +0000
From:   Pavel Begunkov <asml.silence@...il.com>
To:     syzbot <syzbot+06b7d55a62acca161485@...kaller.appspotmail.com>,
        axboe@...nel.dk, io-uring@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, viro@...iv.linux.org.uk
Subject: Re: general protection fault in io_uring_setup

On 14/01/2021 07:27, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    65f0d241 Merge tag 'sound-5.11-rc4' of git://git.kernel.or..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=16bbcd98d00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=ee2266946ed36986
> dashboard link: https://syzkaller.appspot.com/bug?extid=06b7d55a62acca161485
> compiler:       clang version 11.0.0 (https://github.com/llvm/llvm-project.git ca2dcbd030eadbf0aa9b660efe864ff08af6e18b)
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17ef17fb500000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1045ef67500000
> 
> The issue was bisected to:
> 
> commit d9d05217cb6990b9a56e13b56e7a1b71e2551f6c
> Author: Pavel Begunkov <asml.silence@...il.com>
> Date:   Fri Jan 8 20:57:25 2021 +0000
> 
>     io_uring: stop SQPOLL submit on creator's death
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=148ba0cf500000
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=168ba0cf500000
> console output: https://syzkaller.appspot.com/x/log.txt?x=128ba0cf500000
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+06b7d55a62acca161485@...kaller.appspotmail.com
> Fixes: d9d05217cb69 ("io_uring: stop SQPOLL submit on creator's death")

sure it's a duplicate

#syz test: git://git.kernel.dk/linux-block 06585c497b55045ec21aa8128e340f6a6587351c

> 
> Code: e8 cc ac 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 3b 0a fc ff c3 66 2e 0f 1f 84 00 00 00 00
> RSP: 002b:00007ffc6a96c958 EFLAGS: 00000206 ORIG_RAX: 00000000000001a9
> RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 0000000000441889
> RDX: 0000000020ffd000 RSI: 0000000020000200 RDI: 0000000000003040
> RBP: 000000000000d8dd R08: 0000000000000001 R09: 0000000020ffd000
> R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020ffd000
> R13: 0000000020ffb000 R14: 0000000000000000 R15: 0000000000000000
> general protection fault, probably for non-canonical address 0xdffffc0000000022: 0000 [#1] PREEMPT SMP KASAN
> KASAN: null-ptr-deref in range [0x0000000000000110-0x0000000000000117]
> CPU: 0 PID: 8444 Comm: syz-executor770 Not tainted 5.11.0-rc3-syzkaller #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
> RIP: 0010:io_ring_set_wakeup_flag fs/io_uring.c:6929 [inline]
> RIP: 0010:io_disable_sqo_submit fs/io_uring.c:8891 [inline]
> RIP: 0010:io_uring_create fs/io_uring.c:9711 [inline]
> RIP: 0010:io_uring_setup fs/io_uring.c:9739 [inline]
> RIP: 0010:__do_sys_io_uring_setup fs/io_uring.c:9745 [inline]
> RIP: 0010:__se_sys_io_uring_setup+0x2abb/0x37b0 fs/io_uring.c:9742
> Code: c0 00 00 00 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 c5 31 de ff 41 be 14 01 00 00 4c 03 33 4c 89 f0 48 c1 e8 03 <42> 8a 04 28 84 c0 0f 85 46 06 00 00 41 80 0e 01 48 8b 7c 24 30 e8
> RSP: 0018:ffffc90000edfca0 EFLAGS: 00010007
> RAX: 0000000000000022 RBX: ffff888021fe50c0 RCX: 0000000000000001
> RDX: dffffc0000000000 RSI: 0000000000000004 RDI: ffffc90000edfb80
> RBP: ffffc90000edff38 R08: dffffc0000000000 R09: 0000000000000003
> R10: fffff520001dbf71 R11: 0000000000000004 R12: 0000000000000001
> R13: dffffc0000000000 R14: 0000000000000114 R15: 00000000fffffff4
> FS:  0000000000975940(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000000020000204 CR3: 00000000222d6000 CR4: 00000000001506f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
>  do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
>  entry_SYSCALL_64_after_hwframe+0x44/0xa9
> RIP: 0033:0x441889
> Code: e8 cc ac 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 3b 0a fc ff c3 66 2e 0f 1f 84 00 00 00 00
> RSP: 002b:00007ffc6a96c958 EFLAGS: 00000206 ORIG_RAX: 00000000000001a9
> RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 0000000000441889
> RDX: 0000000020ffd000 RSI: 0000000020000200 RDI: 0000000000003040
> RBP: 000000000000d8dd R08: 0000000000000001 R09: 0000000020ffd000
> R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020ffd000
> R13: 0000000020ffb000 R14: 0000000000000000 R15: 0000000000000000
> Modules linked in:
> ---[ end trace d873293344bf9303 ]---
> RIP: 0010:io_ring_set_wakeup_flag fs/io_uring.c:6929 [inline]
> RIP: 0010:io_disable_sqo_submit fs/io_uring.c:8891 [inline]
> RIP: 0010:io_uring_create fs/io_uring.c:9711 [inline]
> RIP: 0010:io_uring_setup fs/io_uring.c:9739 [inline]
> RIP: 0010:__do_sys_io_uring_setup fs/io_uring.c:9745 [inline]
> RIP: 0010:__se_sys_io_uring_setup+0x2abb/0x37b0 fs/io_uring.c:9742
> Code: c0 00 00 00 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 c5 31 de ff 41 be 14 01 00 00 4c 03 33 4c 89 f0 48 c1 e8 03 <42> 8a 04 28 84 c0 0f 85 46 06 00 00 41 80 0e 01 48 8b 7c 24 30 e8
> RSP: 0018:ffffc90000edfca0 EFLAGS: 00010007
> RAX: 0000000000000022 RBX: ffff888021fe50c0 RCX: 0000000000000001
> RDX: dffffc0000000000 RSI: 0000000000000004 RDI: ffffc90000edfb80
> RBP: ffffc90000edff38 R08: dffffc0000000000 R09: 0000000000000003
> R10: fffff520001dbf71 R11: 0000000000000004 R12: 0000000000000001
> R13: dffffc0000000000 R14: 0000000000000114 R15: 00000000fffffff4
> FS:  0000000000975940(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000000020000204 CR3: 00000000222d6000 CR4: 00000000001506f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> 
> 
> ---
> 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@...glegroups.com.
> 
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection
> syzbot can test patches for this issue, for details see:
> https://goo.gl/tpsmEJ#testing-patches
> 

-- 
Pavel Begunkov