syzbot


general protection fault in security_inode_getattr

Status: upstream: reported C repro on 2024/03/27 12:21
Bug presence: origin:downstream
[Documentation on labels]
Reported-by: syzbot+c134c7c0e60ebbe77952@syzkaller.appspotmail.com
First crash: 116d, last: 41d
Bug presence (3)
Date Name Commit Repro Result
2024/03/27 android13-5.15-lts (ToT) 993bed180178 C [report] general protection fault in security_inode_getattr
2024/03/27 lts (merge base) 6139f2a02fe0 C Didn't crash
2024/04/10 upstream (ToT) 2c71fdf02a95 C Didn't crash
Similar bugs (8)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-6-1 general protection fault in security_inode_getattr origin:downstream C 4 7d08h 117d 0/2 upstream: reported C repro on 2024/03/26 18:25
upstream general protection fault in security_inode_getattr overlayfs C done inconclusive 55 435d 1453d 0/27 auto-obsoleted due to no activity on 2023/08/23 09:02
linux-5.15 general protection fault in security_inode_getattr 1 247d 247d 0/3 auto-obsoleted due to no activity on 2024/02/25 11:36
android-54 general protection fault in security_inode_getattr C 3 32d 1413d 0/2 upstream: reported C repro on 2020/09/08 02:23
linux-5.15 general protection fault in security_inode_getattr (2) 4 85d 125d 0/3 upstream: reported on 2024/03/18 14:23
linux-4.19 general protection fault in security_inode_getattr C error 29 654d 1435d 0/1 upstream: reported C repro on 2020/08/16 14:26
linux-6.1 general protection fault in security_inode_getattr 4 42d 91d 0/3 upstream: reported on 2024/04/22 01:07
android-5-10 general protection fault in security_inode_getattr C 7 1d06h 117d 0/2 upstream: reported C repro on 2024/03/26 17:56
Fix bisection attempts (2)
Created Duration User Patch Repo Result
2024/06/11 02:54 1h21m bisect fix android13-5.15-lts OK (0) job log log
2024/04/28 05:24 1h34m bisect fix android13-5.15-lts OK (0) job log log

Sample crash report:
general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]
CPU: 0 PID: 293 Comm: syz-executor246 Not tainted 5.15.148-syzkaller-00718-g993bed180178 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
RIP: 0010:d_backing_inode include/linux/dcache.h:562 [inline]
RIP: 0010:security_inode_getattr+0x47/0x130 security/security.c:1347
Code: 38 ff 49 8d 5f 08 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 37 04 7b ff 48 8b 1b 48 83 c3 30 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 1a 04 7b ff 48 8b 1b 48 83 c3 0c
RSP: 0018:ffffc9000079eeb0 EFLAGS: 00010206
RAX: 0000000000000006 RBX: 0000000000000030 RCX: ffff8881195abb40
RDX: 0000000000000000 RSI: ffffc9000079f3e0 RDI: ffffc9000079f3d0
RBP: ffffc9000079eed8 R08: dffffc0000000000 R09: ffffc9000079f3d0
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffc9000079f3e0
R13: dffffc0000000000 R14: ffffc9000079f3d0 R15: ffffc9000079f3d0
FS:  0000555556ef9480(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000011ee5e000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 vfs_getattr+0x2a/0x320 fs/stat.c:157
 ovl_copy_up_one fs/overlayfs/copy_up.c:961 [inline]
 ovl_copy_up_flags+0x629/0x2d30 fs/overlayfs/copy_up.c:1047
 ovl_maybe_copy_up+0x15a/0x190 fs/overlayfs/copy_up.c:1079
 ovl_open+0xad/0x210 fs/overlayfs/file.c:152
 do_dentry_open+0x81c/0xfd0 fs/open.c:828
 vfs_open fs/open.c:958 [inline]
 dentry_open+0xb8/0x100 fs/open.c:974
 file_open+0x2a7/0x650 fs/incfs/vfs.c:1465
 do_dentry_open+0x81c/0xfd0 fs/open.c:828
 vfs_open+0x73/0x80 fs/open.c:958
 do_open fs/namei.c:3614 [inline]
 path_openat+0x26f0/0x2f40 fs/namei.c:3748
 do_filp_open+0x21c/0x460 fs/namei.c:3775
 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: 0033:0x7f8853a75019
Code: 48 83 c4 28 c3 e8 67 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:00007fff58abf188 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fff58abf190 RCX: 00007f8853a75019
RDX: 0000000000000002 RSI: 0000000020000080 RDI: 0000000000000004
RBP: 00007fff58abf198 R08: 00007f8853a420a0 R09: 00007f8853a420a0
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff58abf3f8 R14: 0000000000000001 R15: 0000000000000001
 </TASK>
Modules linked in:
---[ end trace 63ce3a5a71cfa2a5 ]---
RIP: 0010:d_backing_inode include/linux/dcache.h:562 [inline]
RIP: 0010:security_inode_getattr+0x47/0x130 security/security.c:1347
Code: 38 ff 49 8d 5f 08 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 37 04 7b ff 48 8b 1b 48 83 c3 30 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 1a 04 7b ff 48 8b 1b 48 83 c3 0c
RSP: 0018:ffffc9000079eeb0 EFLAGS: 00010206
RAX: 0000000000000006 RBX: 0000000000000030 RCX: ffff8881195abb40
RDX: 0000000000000000 RSI: ffffc9000079f3e0 RDI: ffffc9000079f3d0
RBP: ffffc9000079eed8 R08: dffffc0000000000 R09: ffffc9000079f3d0
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffc9000079f3e0
R13: dffffc0000000000 R14: ffffc9000079f3d0 R15: ffffc9000079f3d0
FS:  0000555556ef9480(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000011ee5e000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	38 ff                	cmp    %bh,%bh
   2:	49 8d 5f 08          	lea    0x8(%r15),%rbx
   6:	48 89 d8             	mov    %rbx,%rax
   9:	48 c1 e8 03          	shr    $0x3,%rax
   d:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1)
  12:	74 08                	je     0x1c
  14:	48 89 df             	mov    %rbx,%rdi
  17:	e8 37 04 7b ff       	call   0xff7b0453
  1c:	48 8b 1b             	mov    (%rbx),%rbx
  1f:	48 83 c3 30          	add    $0x30,%rbx
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	48 89 df             	mov    %rbx,%rdi
  34:	e8 1a 04 7b ff       	call   0xff7b0453
  39:	48 8b 1b             	mov    (%rbx),%rbx
  3c:	48 83 c3 0c          	add    $0xc,%rbx

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/03/27 12:20 android13-5.15-lts 993bed180178 454571b6 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-5-15 general protection fault in security_inode_getattr
* Struck through repros no longer work on HEAD.