* [syzbot] [io-uring?] general protection fault in io_sqe_buffer_register
@ 2024-11-01 20:07 syzbot
2024-11-01 20:29 ` Jens Axboe
0 siblings, 1 reply; 3+ messages in thread
From: syzbot @ 2024-11-01 20:07 UTC (permalink / raw)
To: asml.silence, axboe, io-uring, linux-kernel, syzkaller-bugs
Hello,
syzbot found the following issue on:
HEAD commit: f9f24ca362a4 Add linux-next specific files for 20241031
git tree: linux-next
console+strace: https://syzkaller.appspot.com/x/log.txt?x=12052630580000
kernel config: https://syzkaller.appspot.com/x/.config?x=328572ed4d152be9
dashboard link: https://syzkaller.appspot.com/bug?extid=05c0f12a4d43d656817e
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15abc6f7980000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10eb655f980000
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/eb84549dd6b3/disk-f9f24ca3.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/beb29bdfa297/vmlinux-f9f24ca3.xz
kernel image: https://storage.googleapis.com/syzbot-assets/8881fe3245ad/bzImage-f9f24ca3.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: [email protected]
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f]
CPU: 0 UID: 0 PID: 5845 Comm: syz-executor176 Not tainted 6.12.0-rc5-next-20241031-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:headpage_already_acct io_uring/rsrc.c:584 [inline]
RIP: 0010:io_buffer_account_pin io_uring/rsrc.c:614 [inline]
RIP: 0010:io_sqe_buffer_register+0xaa8/0x2cf0 io_uring/rsrc.c:758
Code: 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 b0 8a 55 fd 48 8b 1b 48 83 c3 18 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 df e8 8a 8a 55 fd 48 8b 03 48 89 44 24 60
RSP: 0018:ffffc90003faf640 EFLAGS: 00010206
RAX: 0000000000000003 RBX: 0000000000000018 RCX: dffffc0000000000
RDX: ffff88807ef14128 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003faf7f0 R08: ffffffff84a9ce37 R09: 1ffffd40003a8000
R10: dffffc0000000000 R11: fffff940003a8001 R12: ffffea0001d40000
R13: 0000000000000006 R14: 1ffff110060dc350 R15: ffff8880306e1a80
FS: 00005555684d7380(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020010404 CR3: 000000007ea62000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
__io_sqe_buffers_update io_uring/rsrc.c:257 [inline]
__io_register_rsrc_update+0x5c8/0x1320 io_uring/rsrc.c:295
io_register_rsrc_update+0x1d1/0x230 io_uring/rsrc.c:326
__do_sys_io_uring_register io_uring/register.c:938 [inline]
__se_sys_io_uring_register+0x8ee/0x40d0 io_uring/register.c:915
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f96c01b8469
Code: 48 83 c4 28 c3 e8 37 17 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc4e36b3a8 EFLAGS: 00000246 ORIG_RAX: 00000000000001ab
RAX: ffffffffffffffda RBX: 00000000000004b5 RCX: 00007f96c01b8469
RDX: 0000000020000600 RSI: 0000000000000010 RDI: 0000000000000003
RBP: 0000000000000003 R08: 00000000000ac5f8 R09: 00000000000ac5f8
R10: 0000000000000020 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffc4e36b578 R14: 0000000000000001 R15: 0000000000000001
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:headpage_already_acct io_uring/rsrc.c:584 [inline]
RIP: 0010:io_buffer_account_pin io_uring/rsrc.c:614 [inline]
RIP: 0010:io_sqe_buffer_register+0xaa8/0x2cf0 io_uring/rsrc.c:758
Code: 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 b0 8a 55 fd 48 8b 1b 48 83 c3 18 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 48 89 df e8 8a 8a 55 fd 48 8b 03 48 89 44 24 60
RSP: 0018:ffffc90003faf640 EFLAGS: 00010206
RAX: 0000000000000003 RBX: 0000000000000018 RCX: dffffc0000000000
RDX: ffff88807ef14128 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90003faf7f0 R08: ffffffff84a9ce37 R09: 1ffffd40003a8000
R10: dffffc0000000000 R11: fffff940003a8001 R12: ffffea0001d40000
R13: 0000000000000006 R14: 1ffff110060dc350 R15: ffff8880306e1a80
FS: 00005555684d7380(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f96c017d020 CR3: 000000007ea62000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 3 bytes skipped:
0: df 80 3c 08 00 74 filds 0x7400083c(%rax)
6: 08 48 89 or %cl,-0x77(%rax)
9: df e8 fucomip %st(0),%st
b: b0 8a mov $0x8a,%al
d: 55 push %rbp
e: fd std
f: 48 8b 1b mov (%rbx),%rbx
12: 48 83 c3 18 add $0x18,%rbx
16: 48 89 d8 mov %rbx,%rax
19: 48 c1 e8 03 shr $0x3,%rax
1d: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx
24: fc ff df
* 27: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping instruction
2b: 74 08 je 0x35
2d: 48 89 df mov %rbx,%rdi
30: e8 8a 8a 55 fd call 0xfd558abf
35: 48 8b 03 mov (%rbx),%rax
38: 48 89 44 24 60 mov %rax,0x60(%rsp)
---
This report is generated by a bot. It may contain errors.
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [syzbot] [io-uring?] general protection fault in io_sqe_buffer_register
2024-11-01 20:07 [syzbot] [io-uring?] general protection fault in io_sqe_buffer_register syzbot
@ 2024-11-01 20:29 ` Jens Axboe
2024-11-01 20:54 ` syzbot
0 siblings, 1 reply; 3+ messages in thread
From: Jens Axboe @ 2024-11-01 20:29 UTC (permalink / raw)
To: syzbot, asml.silence, io-uring, linux-kernel, syzkaller-bugs
On 11/1/24 2:07 PM, syzbot wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: f9f24ca362a4 Add linux-next specific files for 20241031
> git tree: linux-next
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=12052630580000
> kernel config: https://syzkaller.appspot.com/x/.config?x=328572ed4d152be9
> dashboard link: https://syzkaller.appspot.com/bug?extid=05c0f12a4d43d656817e
> compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15abc6f7980000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10eb655f980000
Same deal:
#syz test: git://git.kernel.dk/linux for-6.13/io_uring
--
Jens Axboe
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [syzbot] [io-uring?] general protection fault in io_sqe_buffer_register
2024-11-01 20:29 ` Jens Axboe
@ 2024-11-01 20:54 ` syzbot
0 siblings, 0 replies; 3+ messages in thread
From: syzbot @ 2024-11-01 20:54 UTC (permalink / raw)
To: asml.silence, axboe, io-uring, linux-kernel, syzkaller-bugs
Hello,
syzbot has tested the proposed patch and the reproducer did not trigger any issue:
Reported-by: [email protected]
Tested-by: [email protected]
Tested on:
commit: 6b1c1819 io_uring/rsrc: fix headpage checking for spar..
git tree: git://git.kernel.dk/linux for-6.13/io_uring
console output: https://syzkaller.appspot.com/x/log.txt?x=10ced340580000
kernel config: https://syzkaller.appspot.com/x/.config?x=37061a3807403bdc
dashboard link: https://syzkaller.appspot.com/bug?extid=05c0f12a4d43d656817e
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
Note: no patches were applied.
Note: testing is done by a robot and is best-effort only.
^ permalink raw reply [flat|nested] 3+ messages in thread
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2024-11-01 20:54 ` syzbot
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