syzbot


general protection fault in security_inode_getattr

Status: upstream: reported on 2024/04/22 01:07
Reported-by: syzbot+968ba20f3b15435ad5bb@syzkaller.appspotmail.com
First crash: 63d, last: 15d
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 21d 90d 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 408d 1426d 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 220d 220d 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 5d00h 1385d 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 13d 89d 0/2 upstream: reported C repro on 2024/03/27 12:21
linux-5.15 general protection fault in security_inode_getattr (2) 4 58d 98d 0/3 upstream: reported on 2024/03/18 14:23
linux-4.19 general protection fault in security_inode_getattr C error 29 627d 1408d 0/1 upstream: reported C repro on 2020/08/16 14:26
android-5-10 general protection fault in security_inode_getattr C 7 17d 90d 0/2 upstream: reported C repro on 2024/03/26 17:56

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: 1 PID: 4728 Comm: syz-executor.3 Not tainted 6.1.92-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
RIP: 0010:d_backing_inode include/linux/dcache.h:543 [inline]
RIP: 0010:security_inode_getattr+0x42/0x120 security/security.c:1359
Code: 9a fd 49 8d 5f 08 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 2c d9 f1 fd 48 8b 2b 48 83 c5 68 48 89 e8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 ef e8 0f d9 f1 fd 48 8b 6d 00 48 83 c5
RSP: 0018:ffffc90004677080 EFLAGS: 00010202
RAX: 000000000000000d RBX: ffffc90004677558 RCX: 0000000000040000
RDX: ffffc90013000000 RSI: 00000000000008ba RDI: 00000000000008bb
RBP: 0000000000000068 R08: dffffc0000000000 R09: ffffc90004677550
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffffc90004677560 R14: 0000000000000000 R15: ffffc90004677550
FS:  00007f80b151f6c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0b828f6000 CR3: 0000000058e4a000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 vfs_getattr+0x26/0x360 fs/stat.c:158
 ovl_copy_up_one fs/overlayfs/copy_up.c:974 [inline]
 ovl_copy_up_flags+0x5e6/0x3e70 fs/overlayfs/copy_up.c:1060
 ovl_maybe_copy_up+0x14e/0x180 fs/overlayfs/copy_up.c:1092
 ovl_open+0x108/0x2a0 fs/overlayfs/file.c:152
 do_dentry_open+0x7f9/0x10f0 fs/open.c:882
 do_open fs/namei.c:3628 [inline]
 path_openat+0x2644/0x2e60 fs/namei.c:3785
 do_filp_open+0x230/0x480 fs/namei.c:3812
 do_sys_openat2+0x13b/0x500 fs/open.c:1318
 do_sys_open fs/open.c:1334 [inline]
 __do_sys_openat fs/open.c:1350 [inline]
 __se_sys_openat fs/open.c:1345 [inline]
 __x64_sys_openat+0x243/0x290 fs/open.c:1345
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f80b087cf69
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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:00007f80b151f0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f80b09b4050 RCX: 00007f80b087cf69
RDX: 0000000000000002 RSI: 0000000020000080 RDI: 0000000000000004
RBP: 00007f80b08da6fe R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f80b09b4050 R15: 00007ffff10c6188
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:d_backing_inode include/linux/dcache.h:543 [inline]
RIP: 0010:security_inode_getattr+0x42/0x120 security/security.c:1359
Code: 9a fd 49 8d 5f 08 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 2c d9 f1 fd 48 8b 2b 48 83 c5 68 48 89 e8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 ef e8 0f d9 f1 fd 48 8b 6d 00 48 83 c5
RSP: 0018:ffffc90004677080 EFLAGS: 00010202
RAX: 000000000000000d RBX: ffffc90004677558 RCX: 0000000000040000
RDX: ffffc90013000000 RSI: 00000000000008ba RDI: 00000000000008bb
RBP: 0000000000000068 R08: dffffc0000000000 R09: ffffc90004677550
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffffc90004677560 R14: 0000000000000000 R15: ffffc90004677550
FS:  00007f80b151f6c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055edd8aa7950 CR3: 0000000058e4a000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	fd                   	std
   1:	49 8d 5f 08          	lea    0x8(%r15),%rbx
   5:	48 89 d8             	mov    %rbx,%rax
   8:	48 c1 e8 03          	shr    $0x3,%rax
   c:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1)
  11:	74 08                	je     0x1b
  13:	48 89 df             	mov    %rbx,%rdi
  16:	e8 2c d9 f1 fd       	call   0xfdf1d947
  1b:	48 8b 2b             	mov    (%rbx),%rbp
  1e:	48 83 c5 68          	add    $0x68,%rbp
  22:	48 89 e8             	mov    %rbp,%rax
  25:	48 c1 e8 03          	shr    $0x3,%rax
* 29:	42 80 3c 20 00       	cmpb   $0x0,(%rax,%r12,1) <-- trapping instruction
  2e:	74 08                	je     0x38
  30:	48 89 ef             	mov    %rbp,%rdi
  33:	e8 0f d9 f1 fd       	call   0xfdf1d947
  38:	48 8b 6d 00          	mov    0x0(%rbp),%rbp
  3c:	48                   	rex.W
  3d:	83                   	.byte 0x83
  3e:	c5                   	.byte 0xc5

Crashes (4):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/06/09 16:33 linux-6.1.y 88690811da69 82c05ab8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan general protection fault in security_inode_getattr
2024/05/21 20:03 linux-6.1.y 4078fa637fcd 4c0d3ee3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan general protection fault in security_inode_getattr
2024/04/27 17:04 linux-6.1.y f2295faba5e8 07b455f9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan general protection fault in security_inode_getattr
2024/04/22 01:06 linux-6.1.y 6741e066ec76 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan general protection fault in security_inode_getattr
* Struck through repros no longer work on HEAD.