syzbot


general protection fault in io_sqe_buffer_register

Status: fixed on 2024/12/16 10:37
Subsystems: io-uring
[Documentation on labels]
Reported-by: syzbot+05c0f12a4d43d656817e@syzkaller.appspotmail.com
Fix commit: d50f94d761a5 io_uring/rsrc: get rid of the empty node and dummy_ubuf
First crash: 53d, last: 50d
Cause bisection: introduced by (bisect log) :
commit 661768085e99aad356ebc77d78ac41fd02eccbe3
Author: Jens Axboe <axboe@kernel.dk>
Date: Wed Oct 30 15:51:58 2024 +0000

  io_uring/rsrc: get rid of the empty node and dummy_ubuf

Crash: BUG: unable to handle kernel NULL pointer dereference in io_sqe_buffer_register (log)
Repro: C syz .config
  
Discussions (2)
Title Replies (including bot) Last reply
[syzbot] [io-uring?] general protection fault in io_sqe_buffer_register 6 (9) 2024/12/04 17:38
[PATCH] io_uring/rsrc: fix null ptr dereference in io_sqe_buffer_register 2 (2) 2024/11/04 03:58
Last patch testing requests (2)
Created Duration User Patch Repo Result
2024/11/17 22:44 8m retest repro linux-next error
2024/11/01 20:29 23m axboe@kernel.dk git://git.kernel.dk/linux for-6.13/io_uring OK log

Sample crash report:
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)

Crashes (55):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/10/31 12:48 linux-next f9f24ca362a4 fb888278 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in io_sqe_buffer_register
2024/11/03 22:44 linux-next c88416ba074a f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in io_sqe_buffer_register
2024/11/03 20:13 linux-next c88416ba074a f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in io_sqe_buffer_register
2024/11/03 20:10 linux-next c88416ba074a f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in io_sqe_buffer_register
2024/11/03 19:48 linux-next c88416ba074a f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in io_sqe_buffer_register
2024/11/03 19:47 linux-next c88416ba074a f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in io_sqe_buffer_register
2024/11/03 19:41 linux-next c88416ba074a f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in io_sqe_buffer_register
2024/11/03 19:40 linux-next c88416ba074a f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in io_sqe_buffer_register
2024/11/03 19:14 linux-next c88416ba074a f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in io_sqe_buffer_register
2024/11/03 19:13 linux-next c88416ba074a f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in io_sqe_buffer_register
2024/11/03 12:07 linux-next c88416ba074a f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in io_sqe_buffer_register
2024/11/03 12:07 linux-next c88416ba074a f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in io_sqe_buffer_register
2024/11/02 15:27 linux-next c88416ba074a f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in io_sqe_buffer_register
2024/11/02 15:26 linux-next c88416ba074a f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in io_sqe_buffer_register
2024/11/02 15:17 linux-next c88416ba074a f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in io_sqe_buffer_register
2024/11/02 15:16 linux-next c88416ba074a f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in io_sqe_buffer_register
2024/11/02 15:08 linux-next c88416ba074a f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in io_sqe_buffer_register
2024/11/02 15:08 linux-next c88416ba074a f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in io_sqe_buffer_register
2024/11/02 15:05 linux-next c88416ba074a f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in io_sqe_buffer_register
2024/11/02 15:05 linux-next c88416ba074a f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in io_sqe_buffer_register
2024/11/02 15:04 linux-next c88416ba074a f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in io_sqe_buffer_register
2024/11/02 15:02 linux-next c88416ba074a f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in io_sqe_buffer_register
2024/11/02 14:42 linux-next c88416ba074a f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in io_sqe_buffer_register
2024/11/02 14:42 linux-next c88416ba074a f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in io_sqe_buffer_register
2024/11/02 14:36 linux-next c88416ba074a f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in io_sqe_buffer_register
2024/11/02 14:35 linux-next c88416ba074a f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in io_sqe_buffer_register
2024/11/02 14:31 linux-next c88416ba074a f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in io_sqe_buffer_register
2024/11/02 00:49 linux-next c88416ba074a f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in io_sqe_buffer_register
2024/11/02 00:49 linux-next c88416ba074a f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in io_sqe_buffer_register
2024/10/31 22:38 linux-next f9f24ca362a4 96eb609f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in io_sqe_buffer_register
2024/10/31 22:37 linux-next f9f24ca362a4 96eb609f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in io_sqe_buffer_register
2024/10/31 11:31 linux-next f9f24ca362a4 fb888278 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in io_sqe_buffer_register
2024/10/31 11:25 linux-next f9f24ca362a4 fb888278 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in io_sqe_buffer_register
2024/10/31 11:21 linux-next f9f24ca362a4 fb888278 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in io_sqe_buffer_register
2024/10/31 11:15 linux-next f9f24ca362a4 fb888278 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in io_sqe_buffer_register
2024/10/31 10:56 linux-next f9f24ca362a4 fb888278 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in io_sqe_buffer_register
2024/10/31 10:40 linux-next f9f24ca362a4 fb888278 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in io_sqe_buffer_register
2024/10/31 10:40 linux-next f9f24ca362a4 fb888278 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in io_sqe_buffer_register
2024/10/31 08:56 linux-next f9f24ca362a4 fb888278 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in io_sqe_buffer_register
2024/10/31 08:56 linux-next f9f24ca362a4 fb888278 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in io_sqe_buffer_register
2024/10/31 08:35 linux-next f9f24ca362a4 fb888278 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in io_sqe_buffer_register
2024/10/31 08:35 linux-next f9f24ca362a4 fb888278 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root general protection fault in io_sqe_buffer_register
* Struck through repros no longer work on HEAD.