syzbot


general protection fault in path_openat

Status: upstream: reported C repro on 2023/05/21 01:33
Reported-by: syzbot+ff97a14204e1de3f1a08@syzkaller.appspotmail.com
First crash: 275d, last: 12d
Cause bisection: introduced by (bisect log) :
commit 6be5b06e4195b002c52a1c2c82573ea7a76ce111
Author: Daniel Rosenberg <drosen@google.com>
Date: Thu Dec 2 22:38:56 2021 +0000

  ANDROID: fuse-bpf v1

Crash: general protection fault in path_openat (log)
Repro: C syz .config
  
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 48d 446d 0/26 upstream: reported C repro on 2022/12/01 14:25
linux-4.19 general protection fault in path_openat C done 13 1476d 1482d 1/1 fixed on 2020/03/06 08:34
upstream general protection fault in path_openat ext4 C done 7 1480d 1480d 15/26 fixed on 2020/02/18 14:31
linux-4.14 general protection fault in path_openat C done 40 1476d 1483d 1/1 fixed on 2020/03/06 21:15
android-5-15 general protection fault in path_openat origin:downstream C done 5 11d 275d 0/2 upstream: reported C repro on 2023/05/21 01:53
android-6-1 general protection fault in path_openat origin:downstream C done 5 33d 275d 0/2 upstream: reported C repro on 2023/05/21 01:53
android-54 general protection fault in path_openat syz 26 1475d 1482d 1/2 fixed on 2021/10/12 13:38
Last patch testing requests (3)
Created Duration User Patch Repo Result
2024/01/03 07:41 5m retest repro android13-5.10-lts report log
2023/10/25 07:00 31m retest repro android13-5.10-lts report log
2023/10/11 06:46 9m retest repro android13-5.10-lts report log
Fix bisection attempts (4)
Created Duration User Patch Repo Result
2024/02/08 09:26 33m bisect fix android13-5.10-lts job log (0) log
2023/12/10 21:39 40m bisect fix android13-5.10-lts job log (0) log
2023/08/06 05:58 1h19m bisect fix android13-5.10-lts job log (0) log
2023/06/20 11:57 15m bisect fix android13-5.10-lts job log (0) 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: 0 PID: 287 Comm: syz-executor257 Not tainted 5.10.194-syzkaller-00508-ga27512601c2d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
RIP: 0010:__d_entry_type include/linux/dcache.h:400 [inline]
RIP: 0010:d_is_miss include/linux/dcache.h:405 [inline]
RIP: 0010:d_is_negative include/linux/dcache.h:451 [inline]
RIP: 0010:atomic_open fs/namei.c:3136 [inline]
RIP: 0010:lookup_open fs/namei.c:3225 [inline]
RIP: 0010:open_last_lookups fs/namei.c:3323 [inline]
RIP: 0010:path_openat+0x17ab/0x3000 fs/namei.c:3512
Code: b6 04 30 84 c0 0f 85 d9 07 00 00 48 8b 44 24 30 80 60 01 f8 e9 69 ee ff ff e8 31 28 b7 ff 4c 8b 64 24 20 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 30 84 c0 0f 85 8f 07 00 00 41 8b 1f be 00 00 70 00 21
RSP: 0018:ffffc90000b27920 EFLAGS: 00010202
RAX: 0000000000000001 RBX: ffff88811eb3b818 RCX: ffff88811ea42780
RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000000
RBP: ffffc90000b27b50 R08: ffffffff81b62ffb R09: ffffed10239002fa
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88811c8017a0
R13: 0000000000008000 R14: dffffc0000000000 R15: 0000000000000008
FS:  00007f20798aa6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020001000 CR3: 000000011e01c000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 do_filp_open+0x21c/0x460 fs/namei.c:3542
 do_sys_openat2+0x13f/0x6f0 fs/open.c:1217
 do_sys_open fs/open.c:1233 [inline]
 __do_sys_openat fs/open.c:1249 [inline]
 __se_sys_openat fs/open.c:1244 [inline]
 __x64_sys_openat+0x243/0x290 fs/open.c:1244
 do_syscall_64+0x34/0x70
 entry_SYSCALL_64_after_hwframe+0x61/0xc6
RIP: 0033:0x7f20798f05f9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 a1 1a 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:00007f20798aa218 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f2079975408 RCX: 00007f20798f05f9
RDX: 0000000000000000 RSI: 0000000020000000 RDI: ffffffffffffff9c
RBP: 00007f2079975400 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f20799420d4
R13: 00007f20799420f0 R14: 00007f2079940016 R15: 2f30656c69662f2e
Modules linked in:
---[ end trace 1f3c36300e805113 ]---
RIP: 0010:__d_entry_type include/linux/dcache.h:400 [inline]
RIP: 0010:d_is_miss include/linux/dcache.h:405 [inline]
RIP: 0010:d_is_negative include/linux/dcache.h:451 [inline]
RIP: 0010:atomic_open fs/namei.c:3136 [inline]
RIP: 0010:lookup_open fs/namei.c:3225 [inline]
RIP: 0010:open_last_lookups fs/namei.c:3323 [inline]
RIP: 0010:path_openat+0x17ab/0x3000 fs/namei.c:3512
Code: b6 04 30 84 c0 0f 85 d9 07 00 00 48 8b 44 24 30 80 60 01 f8 e9 69 ee ff ff e8 31 28 b7 ff 4c 8b 64 24 20 4c 89 f8 48 c1 e8 03 <42> 0f b6 04 30 84 c0 0f 85 8f 07 00 00 41 8b 1f be 00 00 70 00 21
RSP: 0018:ffffc90000b27920 EFLAGS: 00010202
RAX: 0000000000000001 RBX: ffff88811eb3b818 RCX: ffff88811ea42780
RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000000
RBP: ffffc90000b27b50 R08: ffffffff81b62ffb R09: ffffed10239002fa
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88811c8017a0
R13: 0000000000008000 R14: dffffc0000000000 R15: 0000000000000008
FS:  00007f20798aa6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020001000 CR3: 000000011e01c000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	b6 04                	mov    $0x4,%dh
   2:	30 84 c0 0f 85 d9 07 	xor    %al,0x7d9850f(%rax,%rax,8)
   9:	00 00                	add    %al,(%rax)
   b:	48 8b 44 24 30       	mov    0x30(%rsp),%rax
  10:	80 60 01 f8          	andb   $0xf8,0x1(%rax)
  14:	e9 69 ee ff ff       	jmp    0xffffee82
  19:	e8 31 28 b7 ff       	call   0xffb7284f
  1e:	4c 8b 64 24 20       	mov    0x20(%rsp),%r12
  23:	4c 89 f8             	mov    %r15,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 0f b6 04 30       	movzbl (%rax,%r14,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	0f 85 8f 07 00 00    	jne    0x7c6
  37:	41 8b 1f             	mov    (%r15),%ebx
  3a:	be 00 00 70 00       	mov    $0x700000,%esi
  3f:	21                   	.byte 0x21

Crashes (9):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/09/14 05:07 android13-5.10-lts a27512601c2d 0b6a67ac .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in path_openat
2023/05/21 01:27 android13-5.10-lts 43c801dc3325 4bce1a3e .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in path_openat
2023/11/10 19:42 android13-5.10-lts d30b996835c0 45e9b83e .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in path_openat
2023/11/01 11:56 android13-5.10-lts 47abbdeca36f 69904c9f .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in path_openat
2023/09/27 06:45 android13-5.10-lts a27512601c2d 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in path_openat
2023/09/14 04:43 android13-5.10-lts a27512601c2d 0b6a67ac .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in path_openat
2023/06/26 07:27 android13-5.10-lts 571f442f6752 79782afc .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in path_openat
2023/06/23 00:31 android13-5.10-lts 571f442f6752 79782afc .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in path_openat
2023/05/21 01:10 android13-5.10-lts 43c801dc3325 4bce1a3e .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-10 general protection fault in path_openat
* Struck through repros no longer work on HEAD.