syzbot


general protection fault in __inode_security_revalidate

Status: moderation: reported on 2024/05/07 02:22
Subsystems: selinux
[Documentation on labels]
Reported-by: syzbot+64008256791f87511b21@syzkaller.appspotmail.com
First crash: 43d, last: 43d

Sample crash report:
ERROR: (device loop4): jfs_readdir: JFS:Dtree error: ino = 2, bn=0, index = 5
ERROR: (device loop4): jfs_readdir: JFS:Dtree error: ino = 2, bn=0, index = 6
general protection fault, probably for non-canonical address 0xdffffc018c2c0715: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: probably user-memory-access in range [0x0000000c616038a8-0x0000000c616038af]
CPU: 0 PID: 18260 Comm: syz-executor.4 Not tainted 6.9.0-rc6-syzkaller-00113-g49a73b1652c5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:__inode_security_revalidate+0xb1/0x1b0 security/selinux/hooks.c:286
Code: 89 d8 5b 5d 41 5c 41 5d 41 5e c3 cc cc cc cc e8 25 05 55 fd 49 8d 7c 24 22 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 c3 00 00 00
RSP: 0018:ffffc9000332f9e0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000001 RCX: ffffffff8438c0ec
RDX: 000000018c2c0715 RSI: ffffffff8438c10b RDI: 0000000c616038aa
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000c61603888
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000080
FS:  000055556e394480(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc030fec18 CR3: 000000002344c000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 inode_security_rcu security/selinux/hooks.c:309 [inline]
 selinux_inode_permission+0x297/0x5c0 security/selinux/hooks.c:3120
 security_inode_permission+0xbb/0x120 security/security.c:2216
 inode_permission fs/namei.c:536 [inline]
 inode_permission+0x17a/0x5f0 fs/namei.c:503
 may_lookup fs/namei.c:1718 [inline]
 link_path_walk.part.0.constprop.0+0x226/0xcd0 fs/namei.c:2273
 link_path_walk fs/namei.c:2255 [inline]
 path_lookupat+0x93/0x770 fs/namei.c:2484
 filename_lookup+0x1e5/0x5b0 fs/namei.c:2514
 user_path_at_empty+0x42/0x60 fs/namei.c:2921
 user_path_at include/linux/namei.h:57 [inline]
 ksys_umount fs/namespace.c:1916 [inline]
 __do_sys_umount fs/namespace.c:1924 [inline]
 __se_sys_umount fs/namespace.c:1922 [inline]
 __x64_sys_umount+0x10e/0x1a0 fs/namespace.c:1922
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x260 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe91887f057
Code: b0 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 b0 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffc030ff3c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffda RBX: 00007fe9188c93b9 RCX: 00007fe91887f057
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc030ff480
RBP: 00007ffc030ff480 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffc03100570
R13: 00007fe9188c93b9 R14: 00007fe9188dd6b8 R15: 0000000000000015
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__inode_security_revalidate+0xb1/0x1b0 security/selinux/hooks.c:286
Code: 89 d8 5b 5d 41 5c 41 5d 41 5e c3 cc cc cc cc e8 25 05 55 fd 49 8d 7c 24 22 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 c3 00 00 00
RSP: 0018:ffffc9000332f9e0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000001 RCX: ffffffff8438c0ec
RDX: 000000018c2c0715 RSI: ffffffff8438c10b RDI: 0000000c616038aa
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000c61603888
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000080
FS:  000055556e394480(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31f2e000 CR3: 000000002344c000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	89 d8                	mov    %ebx,%eax
   2:	5b                   	pop    %rbx
   3:	5d                   	pop    %rbp
   4:	41 5c                	pop    %r12
   6:	41 5d                	pop    %r13
   8:	41 5e                	pop    %r14
   a:	c3                   	ret
   b:	cc                   	int3
   c:	cc                   	int3
   d:	cc                   	int3
   e:	cc                   	int3
   f:	e8 25 05 55 fd       	call   0xfd550539
  14:	49 8d 7c 24 22       	lea    0x22(%r12),%rdi
  19:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  20:	fc ff df
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	0f b6 04 02          	movzbl (%rdx,%rax,1),%eax <-- trapping instruction
  2e:	48 89 fa             	mov    %rdi,%rdx
  31:	83 e2 07             	and    $0x7,%edx
  34:	38 d0                	cmp    %dl,%al
  36:	7f 08                	jg     0x40
  38:	84 c0                	test   %al,%al
  3a:	0f 85 c3 00 00 00    	jne    0x103

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/05/03 02:17 upstream 49a73b1652c5 ddfc15a1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root general protection fault in __inode_security_revalidate
* Struck through repros no longer work on HEAD.