syzbot


general protection fault in security_inode_getattr (2)

Status: upstream: reported on 2024/03/18 14:23
Reported-by: syzbot+861954e35c7877029cde@syzkaller.appspotmail.com
First crash: 122d, last: 82d
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 3d18h 114d 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 432d 1450d 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 244d 244d 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 28d 1409d 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 37d 113d 0/2 upstream: reported C repro on 2024/03/27 12:21
linux-4.19 general protection fault in security_inode_getattr C error 29 651d 1432d 0/1 upstream: reported C repro on 2020/08/16 14:26
linux-6.1 general protection fault in security_inode_getattr 4 39d 87d 0/3 upstream: reported on 2024/04/22 01:07
android-5-10 general protection fault in security_inode_getattr C 7 41d 114d 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: 12153 Comm: syz-executor.3 Not tainted 5.15.157-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:d_backing_inode include/linux/dcache.h:553 [inline]
RIP: 0010:security_inode_getattr+0x42/0x120 security/security.c:1346
Code: bd fd 49 8d 5f 08 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 ec f5 06 fe 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 cf f5 06 fe 48 8b 6d 00 48 83 c5
RSP: 0018:ffffc90002da7180 EFLAGS: 00010202
RAX: 000000000000000d RBX: ffffc90002da75f8 RCX: 0000000000040000
RDX: ffffc9000d173000 RSI: 0000000000000ef8 RDI: 0000000000000ef9
RBP: 0000000000000068 R08: dffffc0000000000 R09: ffffc90002da75f0
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffffc90002da7600 R14: 0000000000000000 R15: ffffc90002da75f0
FS:  00007ffb60abb6c0(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffb60abbd58 CR3: 000000007c038000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 vfs_getattr+0x26/0x360 fs/stat.c:157
 ovl_copy_up_one fs/overlayfs/copy_up.c:961 [inline]
 ovl_copy_up_flags+0x5e7/0x2e00 fs/overlayfs/copy_up.c:1047
 ovl_maybe_copy_up+0x14e/0x180 fs/overlayfs/copy_up.c:1079
 ovl_open+0xa4/0x200 fs/overlayfs/file.c:149
 do_dentry_open+0x807/0xfb0 fs/open.c:826
 do_open fs/namei.c:3608 [inline]
 path_openat+0x2705/0x2f20 fs/namei.c:3742
 do_filp_open+0x21c/0x460 fs/namei.c:3769
 do_sys_openat2+0x13b/0x500 fs/open.c:1253
 do_sys_open fs/open.c:1269 [inline]
 __do_sys_openat fs/open.c:1285 [inline]
 __se_sys_openat fs/open.c:1280 [inline]
 __x64_sys_openat+0x243/0x290 fs/open.c:1280
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7ffb62569ea9
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:00007ffb60abb0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007ffb62698050 RCX: 00007ffb62569ea9
RDX: 0000000000000002 RSI: 0000000020004280 RDI: ffffffffffffff9c
RBP: 00007ffb625b64a4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007ffb62698050 R15: 00007ffee6873138
 </TASK>
Modules linked in:
---[ end trace bd7592c21548f0a7 ]---
RIP: 0010:d_backing_inode include/linux/dcache.h:553 [inline]
RIP: 0010:security_inode_getattr+0x42/0x120 security/security.c:1346
Code: bd fd 49 8d 5f 08 48 89 d8 48 c1 e8 03 42 80 3c 20 00 74 08 48 89 df e8 ec f5 06 fe 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 cf f5 06 fe 48 8b 6d 00 48 83 c5
RSP: 0018:ffffc90002da7180 EFLAGS: 00010202
RAX: 000000000000000d RBX: ffffc90002da75f8 RCX: 0000000000040000
RDX: ffffc9000d173000 RSI: 0000000000000ef8 RDI: 0000000000000ef9
RBP: 0000000000000068 R08: dffffc0000000000 R09: ffffc90002da75f0
R10: 0000000000000000 R11: dffffc0000000001 R12: dffffc0000000000
R13: ffffc90002da7600 R14: 0000000000000000 R15: ffffc90002da75f0
FS:  00007ffb60abb6c0(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2cd2f000 CR3: 000000007c038000 CR4: 00000000003526e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	bd fd 49 8d 5f       	mov    $0x5f8d49fd,%ebp
   5:	08 48 89             	or     %cl,-0x77(%rax)
   8:	d8 48 c1             	fmuls  -0x3f(%rax)
   b:	e8 03 42 80 3c       	call   0x3c804213
  10:	20 00                	and    %al,(%rax)
  12:	74 08                	je     0x1c
  14:	48 89 df             	mov    %rbx,%rdi
  17:	e8 ec f5 06 fe       	call   0xfe06f608
  1c:	48 8b 2b             	mov    (%rbx),%rbp
  1f:	48 83 c5 68          	add    $0x68,%rbp
  23:	48 89 e8             	mov    %rbp,%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:	48 89 ef             	mov    %rbp,%rdi
  34:	e8 cf f5 06 fe       	call   0xfe06f608
  39:	48 8b 6d 00          	mov    0x0(%rbp),%rbp
  3d:	48                   	rex.W
  3e:	83                   	.byte 0x83
  3f:	c5                   	.byte 0xc5

Crashes (4):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/04/27 16:40 linux-5.15.y b925f60c6ee7 07b455f9 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan general protection fault in security_inode_getattr
2024/04/25 16:45 linux-5.15.y c52b9710c83d 8bdc0f22 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan general protection fault in security_inode_getattr
2024/03/26 08:50 linux-5.15.y b95c01af2113 bcd9b39f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan general protection fault in security_inode_getattr
2024/03/18 14:22 linux-5.15.y b95c01af2113 baa80228 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan general protection fault in security_inode_getattr
* Struck through repros no longer work on HEAD.