syzbot
general protection fault in security_inode_getattr (6)
Status:
upstream: reported on 2026/10/07 17:00
Reported-by: syzbot+be2ef4d6f17c508fc4dc@syzkaller.appspotmail.com
First crash: 14d, last: 5d07h
Sample crash report:
general protection fault, probably for non-canonical address 0xdffffc000000000d: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000068-0x000000000000006f]
CPU: 0 PID: 5589 Comm: syz.0.286 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:d_backing_inode include/linux/dcache.h:553 [inline]
RIP: 0010:security_inode_getattr+0x42/0x120 security/security.c:1396
Code: d2 fd 4c 8d 73 08 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 ec 7d 17 fe 4d 8b 36 49 83 c6 68 4c 89 f0 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 f7 e8 cf 7d 17 fe 4d 8b 36 49 83 c6 0c
RSP: 0018:ffffc9000304f2e8 EFLAGS: 00010202
RAX: 000000000000000d RBX: ffffc9000304f670 RCX: 0000000000080000
RDX: ffffc90005ca1000 RSI: 0000000000000ae8 RDI: 0000000000000ae9
RBP: ffffc9000304f880 R08: ffffc9000304f67f R09: ffffc9000304f670
R10: dffffc0000000000 R11: fffff52000609ed0 R12: dffffc0000000000
R13: ffffc9000304f680 R14: 0000000000000068 R15: ffffc9000304f670
FS: 00007fae39da96c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32719ff8 CR3: 00000000678bf000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
vfs_getattr+0x26/0x3a0 fs/stat.c:157
ovl_copy_up_one fs/overlayfs/copy_up.c:971 [inline]
ovl_copy_up_flags+0x44e/0x1ef0 fs/overlayfs/copy_up.c:1057
ovl_maybe_copy_up+0x14f/0x180 fs/overlayfs/copy_up.c:1089
ovl_open+0x9b/0x1f0 fs/overlayfs/file.c:149
do_dentry_open+0x7f7/0xf90 fs/open.c:826
do_open fs/namei.c:3659 [inline]
path_openat+0x2718/0x2fb0 fs/namei.c:3793
do_filp_open+0x1df/0x400 fs/namei.c:3820
do_sys_openat2+0x14b/0x500 fs/open.c:1255
do_sys_open fs/open.c:1271 [inline]
__do_sys_openat fs/open.c:1287 [inline]
__se_sys_openat fs/open.c:1282 [inline]
__x64_sys_openat+0x135/0x160 fs/open.c:1282
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fae3bb72559
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fae39da9028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fae3bdfa090 RCX: 00007fae3bb72559
RDX: 0000000000020402 RSI: 00002000000003c0 RDI: ffffffffffffff9c
RBP: 00007fae3bc09ab8 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000000000b6 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fae3bdfa128 R14: 00007fae3bdfa090 R15: 00007ffc40aa6048
</TASK>
Modules linked in:
---[ end trace de2da4c2a2a81503 ]---
RIP: 0010:d_backing_inode include/linux/dcache.h:553 [inline]
RIP: 0010:security_inode_getattr+0x42/0x120 security/security.c:1396
Code: d2 fd 4c 8d 73 08 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 ec 7d 17 fe 4d 8b 36 49 83 c6 68 4c 89 f0 48 c1 e8 03 <42> 80 3c 20 00 74 08 4c 89 f7 e8 cf 7d 17 fe 4d 8b 36 49 83 c6 0c
RSP: 0018:ffffc9000304f2e8 EFLAGS: 00010202
RAX: 000000000000000d RBX: ffffc9000304f670 RCX: 0000000000080000
RDX: ffffc90005ca1000 RSI: 0000000000000ae8 RDI: 0000000000000ae9
RBP: ffffc9000304f880 R08: ffffc9000304f67f R09: ffffc9000304f670
R10: dffffc0000000000 R11: fffff52000609ed0 R12: dffffc0000000000
R13: ffffc9000304f680 R14: 0000000000000068 R15: ffffc9000304f670
FS: 00007fae39da96c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc40aa5f80 CR3: 00000000678bf000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: d2 fd sar %cl,%ch
2: 4c 8d 73 08 lea 0x8(%rbx),%r14
6: 4c 89 f0 mov %r14,%rax
9: 48 c1 e8 03 shr $0x3,%rax
d: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1)
12: 74 08 je 0x1c
14: 4c 89 f7 mov %r14,%rdi
17: e8 ec 7d 17 fe call 0xfe177e08
1c: 4d 8b 36 mov (%r14),%r14
1f: 49 83 c6 68 add $0x68,%r14
23: 4c 89 f0 mov %r14,%rax
26: 48 c1 e8 03 shr $0x3,%rax
* 2a: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) <-- trapping instruction
2f: 74 08 je 0x39
31: 4c 89 f7 mov %r14,%rdi
34: e8 cf 7d 17 fe call 0xfe177e08
39: 4d 8b 36 mov (%r14),%r14
3c: 49 83 c6 0c add $0xc,%r14
Struck through repros no longer work on HEAD.