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general protection fault in path_openat

Status: upstream: reported C repro on 2023/05/21 01:53
Bug presence: origin:downstream
[Documentation on labels]
Reported-by: syzbot+8aec6edbebda4c971b84@syzkaller.appspotmail.com
First crash: 550d, last: 84d
Cause bisection: introduced by (bisect log) :
commit 57f3ff9648991998d008ecf32f2f9e78a08bfb8b
Author: Daniel Rosenberg <drosen@google.com>
Date: Thu Dec 2 21:50:02 2021 +0000

  ANDROID: fuse-bpf v1.1

Crash: general protection fault in path_openat (log)
Repro: C syz .config
  
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Bug presence (3)
Date Name Commit Repro Result
2023/09/14 android14-6.1 (ToT) 85902d60cd82 C [report] general protection fault in path_openat
2023/09/14 lts (merge base) b1644a0031cf C Didn't crash
2023/09/14 upstream (ToT) aed8aee11130 C Didn't crash
▶ ▼ Similar bugs (7)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream BUG: unable to handle kernel paging request in path_openat reiserfs C error inconclusive 52 323d 721d 0/28 auto-obsoleted due to no activity on 2024/04/12 10:28
android-5-10 general protection fault in path_openat C done 30 4d20h 550d 0/2 upstream: reported C repro on 2023/05/21 01:33
linux-4.19 general protection fault in path_openat C done 13 1751d 1757d 1/1 fixed on 2020/03/06 08:34
upstream general protection fault in path_openat ext4 C done 7 1755d 1755d 15/28 fixed on 2020/02/18 14:31
linux-4.14 general protection fault in path_openat C done 40 1751d 1757d 1/1 fixed on 2020/03/06 21:15
android-5-15 general protection fault in path_openat origin:downstream C done 7 5d17h 550d 0/2 upstream: reported C repro on 2023/05/21 01:53
android-54 general protection fault in path_openat syz 26 1750d 1757d 1/2 fixed on 2021/10/12 13:38
▶ ▼ Last patch testing requests (6)
Created Duration User Patch Repo Result
2024/10/15 00:23 0m retest repro android14-6.1 error
2024/07/28 17:30 5m retest repro android14-6.1 report log
2024/05/19 17:13 7m retest repro android14-6.1 report log
2024/03/10 16:27 5m retest repro android14-6.1 report log
2023/12/18 14:01 5m retest repro android14-6.1 report log
2023/10/09 13:10 43m retest repro android14-6.1 report log
▶ ▼ Fix bisection attempts (9)
Created Duration User Patch Repo Result
2024/10/14 23:06 0m bisect fix android14-6.1 error job log
2024/08/29 03:35 40m bisect fix android14-6.1 OK (0) job log log
2024/06/26 09:03 58m bisect fix android14-6.1 OK (0) job log log
2024/04/28 12:19 1h06m bisect fix android14-6.1 OK (0) job log log
2024/02/25 15:47 39m bisect fix android14-6.1 OK (0) job log log
2024/01/18 21:54 40m bisect fix android14-6.1 OK (0) job log log
2023/11/12 14:49 41m bisect fix android14-6.1 OK (0) job log log
2023/07/31 10:47 1h02m bisect fix android14-6.1 OK (0) job log log
2023/06/20 20:45 39m bisect fix android14-6.1 OK (0) job log log

Sample crash report:
general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 1 PID: 298 Comm: syz-executor287 Not tainted 6.1.25-syzkaller-00006-gc2ac612610e0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
RIP: 0010:__d_entry_type include/linux/dcache.h:394 [inline]
RIP: 0010:d_is_miss include/linux/dcache.h:399 [inline]
RIP: 0010:d_is_negative include/linux/dcache.h:445 [inline]
RIP: 0010:atomic_open fs/namei.c:3292 [inline]
RIP: 0010:lookup_open fs/namei.c:3384 [inline]
RIP: 0010:open_last_lookups fs/namei.c:3481 [inline]
RIP: 0010:path_openat+0x133f/0x2d60 fs/namei.c:3711
Code: ff ff 48 8b 3c 24 e8 80 e2 02 00 48 63 db 4c 8b 74 24 08 eb 5f e8 51 b5 ad ff 4c 8b 74 24 08 48 8b 1c 24 48 89 d8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 1c 0b 00 00 48 89 1c 24 8b 1b be 00 00
RSP: 0018:ffffc90000e67940 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000000000000008 RCX: ffff888109592880
RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000000
RBP: ffffc90000e67b30 R08: ffffffff81ca0cab R09: fffff520001ccf0f
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000
R13: dffffc0000000000 R14: ffffc90000e67b88 R15: ffffc90000e67da0
FS:  00007f85102886c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020001000 CR3: 00000001200b6000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 do_filp_open+0x230/0x480 fs/namei.c:3741
 do_sys_openat2+0x13f/0x850 fs/open.c:1333
 do_sys_open fs/open.c:1349 [inline]
 __do_sys_openat fs/open.c:1365 [inline]
 __se_sys_openat fs/open.c:1360 [inline]
 __x64_sys_openat+0x243/0x290 fs/open.c:1360
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f85102c64f9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f8510288218 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f8510353408 RCX: 00007f85102c64f9
RDX: 0000000000000000 RSI: 0000000020000000 RDI: ffffffffffffff9c
RBP: 00007f8510353400 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f8510320024
R13: 00007f8510320040 R14: 00007f851031e016 R15: 2f30656c69662f2e
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__d_entry_type include/linux/dcache.h:394 [inline]
RIP: 0010:d_is_miss include/linux/dcache.h:399 [inline]
RIP: 0010:d_is_negative include/linux/dcache.h:445 [inline]
RIP: 0010:atomic_open fs/namei.c:3292 [inline]
RIP: 0010:lookup_open fs/namei.c:3384 [inline]
RIP: 0010:open_last_lookups fs/namei.c:3481 [inline]
RIP: 0010:path_openat+0x133f/0x2d60 fs/namei.c:3711
Code: ff ff 48 8b 3c 24 e8 80 e2 02 00 48 63 db 4c 8b 74 24 08 eb 5f e8 51 b5 ad ff 4c 8b 74 24 08 48 8b 1c 24 48 89 d8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 1c 0b 00 00 48 89 1c 24 8b 1b be 00 00
RSP: 0018:ffffc90000e67940 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000000000000008 RCX: ffff888109592880
RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000000
RBP: ffffc90000e67b30 R08: ffffffff81ca0cab R09: fffff520001ccf0f
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000
R13: dffffc0000000000 R14: ffffc90000e67b88 R15: ffffc90000e67da0
FS:  00007f85102886c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020001000 CR3: 00000001200b6000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	ff 48 8b             	decl   -0x75(%rax)
   3:	3c 24                	cmp    $0x24,%al
   5:	e8 80 e2 02 00       	call   0x2e28a
   a:	48 63 db             	movslq %ebx,%rbx
   d:	4c 8b 74 24 08       	mov    0x8(%rsp),%r14
  12:	eb 5f                	jmp    0x73
  14:	e8 51 b5 ad ff       	call   0xffadb56a
  19:	4c 8b 74 24 08       	mov    0x8(%rsp),%r14
  1e:	48 8b 1c 24          	mov    (%rsp),%rbx
  22:	48 89 d8             	mov    %rbx,%rax
  25:	48 c1 e8 03          	shr    $0x3,%rax
* 29:	42 0f b6 04 28       	movzbl (%rax,%r13,1),%eax <-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	0f 85 1c 0b 00 00    	jne    0xb52
  36:	48 89 1c 24          	mov    %rbx,(%rsp)
  3a:	8b 1b                	mov    (%rbx),%ebx
  3c:	be                   	.byte 0xbe

Crashes (6):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/09/14 05:24 android14-6.1 c2ac612610e0 0b6a67ac .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in path_openat
2023/05/21 01:52 android14-6.1 cffbdd825e02 4bce1a3e .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in path_openat
2024/03/27 18:32 android14-6.1 eef3b6e52937 454571b6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in path_openat
2023/12/03 17:59 android14-6.1 6465e29536ed f819d6f7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in path_openat
2023/11/26 23:57 android14-6.1 d2c0f4c4502a 5b429f39 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in path_openat
2023/11/25 02:19 android14-6.1 d2c0f4c4502a 5b429f39 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in path_openat
* Struck through repros no longer work on HEAD.