[syzbot] [audit?] general protection fault in smack_log_callback

[Casey Schaufler]

On 9/19/2024 9:05 AM, Paul Moore wrote:
> On Thu, Sep 19, 2024 at 9:23 AM syzbot
> <syzbot+044fdf24e96093584232 at syzkaller.appspotmail.com> wrote:
>> Hello,
>>
>> syzbot found the following issue on:
>>
>> HEAD commit:    bdf56c7580d2 Merge tag 'slab-for-6.12' of git://git.kernel..
>> git tree:       upstream
>> console output: https://syzkaller.appspot.com/x/log.txt?x=12584b00580000
>> kernel config:  https://syzkaller.appspot.com/x/.config?x=4540f5bcdd31e3de
>> dashboard link: https://syzkaller.appspot.com/bug?extid=044fdf24e96093584232
>> compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
>> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=155cffc7980000
>> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=16ad24a9980000
>>
>> Downloadable assets:
>> disk image: https://storage.googleapis.com/syzbot-assets/cec9f3c675f1/disk-bdf56c75.raw.xz
>> vmlinux: https://storage.googleapis.com/syzbot-assets/21e06ae5b159/vmlinux-bdf56c75.xz
>> kernel image: https://storage.googleapis.com/syzbot-assets/1e936c954b8b/bzImage-bdf56c75.xz
>>
>> The issue was bisected to:
>>
>> commit 5f8d28f6d7d568dbbc8c5bce94894474c07afd4f
>> Author: Casey Schaufler <casey at schaufler-ca.com>
>> Date:   Wed Jul 10 21:32:26 2024 +0000
>>
>>     lsm: infrastructure management of the key security blob
>>
>> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1124d69f980000
>> final oops:     https://syzkaller.appspot.com/x/report.txt?x=1324d69f980000
>> console output: https://syzkaller.appspot.com/x/log.txt?x=1524d69f980000
> I just posted a patch which I believe should fix the problem, but I'd
> like to get Casey's ACK on it before submitting upstream as it does
> touch Smack code; lore link below:

Thanks for jumping on this. Your build and test cycle is faster than mine.

>
> https://lore.kernel.org/linux-security-module/20240919155740.29539-2-paul@paul-moore.com
>
> .. in the meantime, I'm attaching the patch here so syzbot can verify
> that it solves the problem.
>
> #syz test
>