Re: kernel panic: MAC Initialization failed.

On Wed, Feb 27, 2019 at 11:37 PM Tetsuo Handa
[off-list ref] wrote:

On 2019/02/28 2:02, syzbot wrote:

quoted

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@syzkaller.appspotmail.com

Thank you. The LSM stacking seems to be working as expected.
But this one should not be considered as a bug.

If something went wrong before loading access control rules,
it is pointless to continue. Thus, stopping with kernel panic.

Hi Tetsuo,

What misconfiguration you mean?

If this path is trivially triggered enough to prevent testing, syzbot can
load access control rules from /etc/tomoyo/ directory of the filesystem
image and make tomoyo_policy_loaded = true by executing /sbin/init .

Hmm, maybe we need to think about automated testing environments where
neither built-in access control rules nor run-time access control rules
can be provided ... ?

#syz invalid

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