syzbot


general protection fault in security_inode_getattr

Status: upstream: reported C repro on 2024/03/26 18:25
Bug presence: origin:downstream
[Documentation on labels]
Reported-by: syzbot+c58fbb225bcffe111d4a@syzkaller.appspotmail.com
First crash: 80d, last: 11d
Bug presence (3)
Date Name Commit Repro Result
2024/03/27 android14-6.1 (ToT) eef3b6e52937 C [report] general protection fault in security_inode_getattr
2024/03/27 lts (merge base) 883d1a956208 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
upstream general protection fault in security_inode_getattr overlayfs C done inconclusive 55 398d 1416d 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 210d 210d 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 66d 1376d 0/2 upstream: reported C repro on 2020/09/08 02:23
android-5-15 general protection fault in security_inode_getattr origin:downstream C 1 4d01h 79d 0/2 upstream: reported C repro on 2024/03/27 12:21
linux-5.15 general protection fault in security_inode_getattr (2) 4 48d 88d 0/3 upstream: reported on 2024/03/18 14:23
linux-4.19 general protection fault in security_inode_getattr C error 29 617d 1398d 0/1 upstream: reported C repro on 2020/08/16 14:26
linux-6.1 general protection fault in security_inode_getattr 4 5d12h 54d 0/3 upstream: reported on 2024/04/22 01:07
android-5-10 general protection fault in security_inode_getattr C 7 7d19h 80d 0/2 upstream: reported C repro on 2024/03/26 17:56

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: 1 PID: 298 Comm: syz-executor337 Not tainted 6.1.68-syzkaller-00095-g8790a94475c9 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
RIP: 0010:d_backing_inode include/linux/dcache.h:552 [inline]
RIP: 0010:security_inode_getattr+0x47/0x130 security/security.c:1359
Code: 30 ff 49 8d 5f 08 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 c7 1c 77 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 aa 1c 77 ff 48 8b 1b 48 83 c3 0c
RSP: 0018:ffffc90000e86eb8 EFLAGS: 00010206

RAX: 0000000000000006 RBX: 0000000000000030 RCX: ffff8881095a5100
RDX: 0000000000000000 RSI: ffffc90000e873a0 RDI: ffffc90000e87390
RBP: ffffc90000e86ee0 R08: dffffc0000000000 R09: ffffc90000e87390
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffc90000e873a0
R13: dffffc0000000000 R14: ffffc90000e87390 R15: ffffc90000e87390
FS:  0000555555f84480(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000109461000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 vfs_getattr+0x2a/0x310 fs/stat.c:158
 ovl_copy_up_one fs/overlayfs/copy_up.c:974 [inline]
 ovl_copy_up_flags+0x5c8/0x3b40 fs/overlayfs/copy_up.c:1060
 ovl_maybe_copy_up+0x15a/0x190 fs/overlayfs/copy_up.c:1092
 ovl_open+0x108/0x2a0 fs/overlayfs/file.c:155
 do_dentry_open+0x891/0x1250 fs/open.c:884
 vfs_open fs/open.c:1015 [inline]
 dentry_open+0xb8/0x100 fs/open.c:1031
 file_open+0x2a7/0x650 fs/incfs/vfs.c:1466
 do_dentry_open+0x891/0x1250 fs/open.c:884
 vfs_open+0x73/0x80 fs/open.c:1015
 do_open fs/namei.c:3557 [inline]
 path_openat+0x2532/0x2d60 fs/namei.c:3714
 do_filp_open+0x230/0x480 fs/namei.c:3741
 do_sys_openat2+0x13f/0x850 fs/open.c:1341
 do_sys_open fs/open.c:1357 [inline]
 __do_sys_openat fs/open.c:1373 [inline]
 __se_sys_openat fs/open.c:1368 [inline]
 __x64_sys_openat+0x243/0x290 fs/open.c:1368
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f479e2c3019
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:00007ffcd6f3d108 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007ffcd6f3d110 RCX: 00007f479e2c3019
RDX: 0000000000000002 RSI: 0000000020000080 RDI: 0000000000000004
RBP: 00007ffcd6f3d118 R08: 00007f479e2900a0 R09: 00007f479e2900a0
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffcd6f3d378 R14: 0000000000000001 R15: 0000000000000001
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:d_backing_inode include/linux/dcache.h:552 [inline]
RIP: 0010:security_inode_getattr+0x47/0x130 security/security.c:1359
Code: 30 ff 49 8d 5f 08 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 c7 1c 77 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 aa 1c 77 ff 48 8b 1b 48 83 c3 0c
RSP: 0018:ffffc90000e86eb8 EFLAGS: 00010206
RAX: 0000000000000006 RBX: 0000000000000030 RCX: ffff8881095a5100
RDX: 0000000000000000 RSI: ffffc90000e873a0 RDI: ffffc90000e87390
RBP: ffffc90000e86ee0 R08: dffffc0000000000 R09: ffffc90000e87390
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffc90000e873a0
R13: dffffc0000000000 R14: ffffc90000e87390 R15: ffffc90000e87390
FS:  0000555555f84480(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000109461000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	30 ff                	xor    %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 c7 1c 77 ff       	call   0xff771ce3
  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 aa 1c 77 ff       	call   0xff771ce3
  39:	48 8b 1b             	mov    (%rbx),%rbx
  3c:	48 83 c3 0c          	add    $0xc,%rbx

Crashes (4):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/03/26 18:22 android14-6.1 8790a94475c9 bcd9b39f .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in security_inode_getattr
2024/06/03 19:46 android14-6.1 997e6b3f6a21 0aba2352 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in security_inode_getattr
2024/04/22 06:26 android14-6.1 dcb09569bbff af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in security_inode_getattr
2024/04/09 21:41 android14-6.1 5dc2bc296647 171ec371 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-1 general protection fault in security_inode_getattr
* Struck through repros no longer work on HEAD.