syzbot


general protection fault in aa_file_perm

Status: auto-obsoleted due to no activity on 2022/09/03 18:14
Reported-by: syzbot+3b837fae591e5d09bcd5@syzkaller.appspotmail.com
First crash: 111d, last: 111d

Sample crash report:
general protection fault, probably for non-canonical address 0xdffffc0000000008: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000040-0x0000000000000047]
CPU: 2 PID: 3844 Comm: syz-executor.1 Not tainted 5.18.0-syzkaller-13918-g44688ffd111a #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
RIP: 0010:aa_file_perm+0x183/0x1230 security/apparmor/file.c:612
Code: e8 b2 e0 b0 fd 45 84 e4 41 59 0f 84 7e 04 00 00 e8 a2 e4 b0 fd 49 8d 7e 40 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 3e 0f 00 00 4d 8b 66 40 e8 da e7 9a fd 31 ff 41
RSP: 0018:ffffc900029c7c38 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff888021a88780 RCX: 0000000000000000
RDX: 0000000000000008 RSI: ffffffff83c991ee RDI: 0000000000000040
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffffff83c99199
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000001
R13: ffff8880119bdab0 R14: 0000000000000000 R15: 000000000000001a
FS:  0000000000000000(0000) GS:ffff88802ca00000(0063) knlGS:000000005695f380
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f7e97ae4 CR3: 0000000045756000 CR4: 0000000000150ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 common_file_perm security/apparmor/lsm.c:495 [inline]
 apparmor_file_permission+0x15e/0x4e0 security/apparmor/lsm.c:509
 security_file_permission+0x4d/0xd0 security/security.c:1517
 rw_verify_area+0xae/0x1b0 fs/read_write.c:385
 vfs_write+0x163/0xac0 fs/read_write.c:582
 ksys_write+0x1e8/0x250 fs/read_write.c:644
 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
 __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178
 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203
 entry_SYSENTER_compat_after_hwframe+0x53/0x62
RIP: 0023:0xf7fce549
Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000ffd520b0 EFLAGS: 00000246 ORIG_RAX: 0000000000000004
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00000000ffd5225c
RDX: 000000000000001a RSI: 00000000f6f36000 RDI: 00000000ffd5225c
RBP: 00000000f6f3bde0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:aa_file_perm+0x183/0x1230 security/apparmor/file.c:612
Code: e8 b2 e0 b0 fd 45 84 e4 41 59 0f 84 7e 04 00 00 e8 a2 e4 b0 fd 49 8d 7e 40 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 3e 0f 00 00 4d 8b 66 40 e8 da e7 9a fd 31 ff 41
RSP: 0018:ffffc900029c7c38 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff888021a88780 RCX: 0000000000000000
RDX: 0000000000000008 RSI: ffffffff83c991ee RDI: 0000000000000040
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffffff83c99199
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000001
R13: ffff8880119bdab0 R14: 0000000000000000 R15: 000000000000001a
FS:  0000000000000000(0000) GS:ffff88802ca00000(0063) knlGS:000000005695f380
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000f7e97ae4 CR3: 0000000045756000 CR4: 0000000000150ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	e8 b2 e0 b0 fd       	callq  0xfdb0e0b7
   5:	45 84 e4             	test   %r12b,%r12b
   8:	41 59                	pop    %r9
   a:	0f 84 7e 04 00 00    	je     0x48e
  10:	e8 a2 e4 b0 fd       	callq  0xfdb0e4b7
  15:	49 8d 7e 40          	lea    0x40(%r14),%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:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2e:	0f 85 3e 0f 00 00    	jne    0xf72
  34:	4d 8b 66 40          	mov    0x40(%r14),%r12
  38:	e8 da e7 9a fd       	callq  0xfd9ae817
  3d:	31 ff                	xor    %edi,%edi
  3f:	41                   	rex.B

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-qemu-upstream-386 2022/06/05 18:14 upstream 44688ffd111a c8857892 .config log report info general protection fault in aa_file_perm
* Struck through repros no longer work on HEAD.