syzbot


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+ea487d1ec1a25689e4d2@syzkaller.appspotmail.com
First crash: 282d, last: 18d
Cause bisection: introduced by (bisect log) :
commit f5f4199c102aa676998b42abff60d071385c1c0c
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
  
Bug presence (3)
Date Name Commit Repro Result
2023/09/24 android13-5.15-lts (ToT) ea586874d2f9 C [report] general protection fault in path_openat
2023/09/24 lts (merge base) aff03380bda4 C Didn't crash
2023/09/24 upstream (ToT) 3aba70aed91f 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 55d 453d 0/26 upstream: reported C repro on 2022/12/01 14:25
android-5-10 general protection fault in path_openat C done 9 19d 282d 0/2 upstream: reported C repro on 2023/05/21 01:33
linux-4.19 general protection fault in path_openat C done 13 1483d 1489d 1/1 fixed on 2020/03/06 08:34
upstream general protection fault in path_openat ext4 C done 7 1487d 1487d 15/26 fixed on 2020/02/18 14:31
linux-4.14 general protection fault in path_openat C done 40 1483d 1490d 1/1 fixed on 2020/03/06 21:15
android-6-1 general protection fault in path_openat origin:downstream C done 5 2d07h 282d 0/2 upstream: reported C repro on 2023/05/21 01:53
android-54 general protection fault in path_openat syz 26 1482d 1489d 1/2 fixed on 2021/10/12 13:38
Last patch testing requests (3)
Created Duration User Patch Repo Result
2024/01/02 06:37 15m retest repro android13-5.15-lts report log
2023/12/19 04:58 25m retest repro android13-5.15-lts report log
2023/10/22 05:37 10m retest repro android13-5.15-lts report log
Fix bisection attempts (3)
Created Duration User Patch Repo Result
2024/02/09 02:18 46m bisect fix android13-5.15-lts job log (0) log
2023/08/13 03:01 59m bisect fix android13-5.15-lts job log (0) log
2023/06/20 23:25 16m bisect fix android13-5.15-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: 295 Comm: syz-executor151 Not tainted 5.15.131-syzkaller-00653-gea586874d2f9 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/04/2023
RIP: 0010:__d_entry_type include/linux/dcache.h:404 [inline]
RIP: 0010:d_is_miss include/linux/dcache.h:409 [inline]
RIP: 0010:d_is_negative include/linux/dcache.h:455 [inline]
RIP: 0010:atomic_open fs/namei.c:3271 [inline]
RIP: 0010:lookup_open fs/namei.c:3363 [inline]
RIP: 0010:open_last_lookups fs/namei.c:3462 [inline]
RIP: 0010:path_openat+0x185b/0x2f40 fs/namei.c:3669
Code: b6 04 28 84 c0 0f 85 ef 07 00 00 48 8b 44 24 28 80 60 01 f8 e9 cc ed ff ff e8 b1 e6 b2 ff 48 8b 5c 24 10 48 89 d8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 a6 07 00 00 49 89 de 8b 1b be 00 00 70
RSP: 0018:ffffc90000957900 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000000000000008 RCX: ffff88811e830000
RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000000
RBP: ffffc90000957b50 R08: ffffffff81bff470 R09: ffffed1023893f82
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffc90000957ba0
R13: dffffc0000000000 R14: 0000000000000008 R15: ffffc90000957da0
FS:  00007f0da83906c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020001000 CR3: 000000011e1e8000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 do_filp_open+0x21c/0x460 fs/namei.c:3699
 do_sys_openat2+0x13f/0x830 fs/open.c:1234
 do_sys_open fs/open.c:1250 [inline]
 __do_sys_openat fs/open.c:1266 [inline]
 __se_sys_openat fs/open.c:1261 [inline]
 __x64_sys_openat+0x243/0x290 fs/open.c:1261
 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+0x61/0xcb
RIP: 0033:0x7f0da83ce4f9
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:00007f0da8390218 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f0da845b408 RCX: 00007f0da83ce4f9
RDX: 0000000000000000 RSI: 0000000020000000 RDI: ffffffffffffff9c
RBP: 00007f0da845b400 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0da8428024
R13: 00007f0da8428040 R14: 00007f0da8426016 R15: 2f30656c69662f2e
 </TASK>
Modules linked in:
---[ end trace c9c82964a3066dc3 ]---
RIP: 0010:__d_entry_type include/linux/dcache.h:404 [inline]
RIP: 0010:d_is_miss include/linux/dcache.h:409 [inline]
RIP: 0010:d_is_negative include/linux/dcache.h:455 [inline]
RIP: 0010:atomic_open fs/namei.c:3271 [inline]
RIP: 0010:lookup_open fs/namei.c:3363 [inline]
RIP: 0010:open_last_lookups fs/namei.c:3462 [inline]
RIP: 0010:path_openat+0x185b/0x2f40 fs/namei.c:3669
Code: b6 04 28 84 c0 0f 85 ef 07 00 00 48 8b 44 24 28 80 60 01 f8 e9 cc ed ff ff e8 b1 e6 b2 ff 48 8b 5c 24 10 48 89 d8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 a6 07 00 00 49 89 de 8b 1b be 00 00 70
RSP: 0018:ffffc90000957900 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000000000000008 RCX: ffff88811e830000
RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000000
RBP: ffffc90000957b50 R08: ffffffff81bff470 R09: ffffed1023893f82
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffc90000957ba0
R13: dffffc0000000000 R14: 0000000000000008 R15: ffffc90000957da0
FS:  00007f0da83906c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020001000 CR3: 000000011e1e8000 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:	28 84 c0 0f 85 ef 07 	sub    %al,0x7ef850f(%rax,%rax,8)
   9:	00 00                	add    %al,(%rax)
   b:	48 8b 44 24 28       	mov    0x28(%rsp),%rax
  10:	80 60 01 f8          	andb   $0xf8,0x1(%rax)
  14:	e9 cc ed ff ff       	jmp    0xffffede5
  19:	e8 b1 e6 b2 ff       	call   0xffb2e6cf
  1e:	48 8b 5c 24 10       	mov    0x10(%rsp),%rbx
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 0f b6 04 28       	movzbl (%rax,%r13,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	0f 85 a6 07 00 00    	jne    0x7dd
  37:	49 89 de             	mov    %rbx,%r14
  3a:	8b 1b                	mov    (%rbx),%ebx
  3c:	be                   	.byte 0xbe
  3d:	00 00                	add    %al,(%rax)
  3f:	70                   	.byte 0x70

Crashes (5):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/09/24 19:26 android13-5.15-lts ea586874d2f9 0b6a67ac .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in path_openat
2023/05/21 01:52 android13-5.15-lts 19c0ed55a470 4bce1a3e .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in path_openat
2023/12/05 03:44 android13-5.15-lts 0e7c7966689d f819d6f7 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in path_openat
2023/11/25 02:18 android13-5.15-lts 61cfd264993d 5b429f39 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in path_openat
2023/11/19 18:51 android13-5.15-lts 61cfd264993d cb976f63 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in path_openat
* Struck through repros no longer work on HEAD.