kernel panic: MAC Initialization failed.

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit:    7b827ff9af88 Add linux-next specific files for 20190227
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=15336f14c00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=5fa6b8975759dcc5
dashboard link: https://syzkaller.appspot.com/bug?extid=e1b8084e532b6ee7afab
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17ee708ac00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16954084c00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+e1b8084e532b6ee7afab at syzkaller.appspotmail.com

  do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x441059
Code: e8 0c ad 02 00 48 83 c4 18 c3 0f 1f 80 00 00 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 0f 83 bb 0a fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffcf60be0b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000142
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441059
RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000004
RBP: 00007ffcf60be0d0 R08: 0000000000001000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: ffffffffffffffff
R13: 0000000000000005 R14: 0000000000000000 R15: 0000000000000000
ERROR: Out of memory at tomoyo_realpath_from_path.
Kernel panic - not syncing: MAC Initialization failed.
CPU: 0 PID: 9747 Comm: syz-executor533 Not tainted 5.0.0-rc8-next-20190227  
#44
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Call Trace:
  __dump_stack lib/dump_stack.c:77 [inline]
  dump_stack+0x172/0x1f0 lib/dump_stack.c:113
  panic+0x2cb/0x65c kernel/panic.c:214
  tomoyo_warn_oom.cold+0x35/0x43 security/tomoyo/memory.c:28
  tomoyo_realpath_from_path+0x3a8/0x730 security/tomoyo/realpath.c:320
  tomoyo_realpath_nofollow+0xc8/0xdb security/tomoyo/realpath.c:336
  tomoyo_find_next_domain+0x28c/0x1f8a security/tomoyo/domain.c:725
  tomoyo_bprm_check_security security/tomoyo/tomoyo.c:107 [inline]
  tomoyo_bprm_check_security+0x12a/0x1b0 security/tomoyo/tomoyo.c:97
  security_bprm_check+0x69/0xb0 security/security.c:751
  search_binary_handler+0x77/0x570 fs/exec.c:1644
  exec_binprm fs/exec.c:1698 [inline]
  __do_execve_file.isra.0+0x1394/0x23f0 fs/exec.c:1818
  do_execveat_common fs/exec.c:1865 [inline]
  do_execveat fs/exec.c:1893 [inline]
  __do_sys_execveat fs/exec.c:1969 [inline]
  __se_sys_execveat fs/exec.c:1961 [inline]
  __x64_sys_execveat+0xed/0x130 fs/exec.c:1961
  do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
  entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x441059
Code: e8 0c ad 02 00 48 83 c4 18 c3 0f 1f 80 00 00 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 0f 83 bb 0a fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffcf60be0b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000142
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441059
RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000004
RBP: 00007ffcf60be0d0 R08: 0000000000001000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: ffffffffffffffff
R13: 0000000000000005 R14: 0000000000000000 R15: 0000000000000000
Kernel Offset: disabled
Rebooting in 86400 seconds..


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