linux-kernel - Re: [syzbot] Monthly lsm report (Sep 2024)

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Message-ID: <d477ba9b-8a95-4e95-8fc6-4e6d77141fb4@schaufler-ca.com>
Date: Fri, 27 Sep 2024 17:18:19 -0700
From: Casey Schaufler <casey@...aufler-ca.com>
To: Paul Moore <paul@...l-moore.com>, Mimi Zohar <zohar@...ux.ibm.com>,
 Roberto Sassu <roberto.sassu@...wei.com>,
 syzbot <syzbot+listfc277c7cb94932601d96@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org, linux-security-module@...r.kernel.org,
 syzkaller-bugs@...glegroups.com, Casey Schaufler <casey@...aufler-ca.com>
Subject: Re: [syzbot] Monthly lsm report (Sep 2024)

On 9/23/2024 9:15 AM, Casey Schaufler wrote:
> On 9/23/2024 5:06 AM, Paul Moore wrote:
>> On Mon, Sep 23, 2024 at 5:02 AM syzbot
>> <syzbot+listfc277c7cb94932601d96@...kaller.appspotmail.com> wrote:
>>> Hello lsm maintainers/developers,
>>>
>>> This is a 31-day syzbot report for the lsm subsystem.
>>> All related reports/information can be found at:
>>> https://syzkaller.appspot.com/upstream/s/lsm
>>>
>>> During the period, 0 new issues were detected and 0 were fixed.
>>> In total, 4 issues are still open and 27 have been fixed so far.
>>>
>>> Some of the still happening issues:
>>>
>>> Ref Crashes Repro Title
>>> <1> 306     No    INFO: task hung in process_measurement (2)
>>>                   https://syzkaller.appspot.com/bug?extid=1de5a37cb85a2d536330
>> Mimi, Roberto,
>>
>> Any chance this is this related in any way to this report:
>>
>> https://lore.kernel.org/linux-security-module/CALAgD-4hkHVcCq2ycdwnA2hYDBMqijLUOfZgvf1WfFpU-8+42w@mail.gmail.com/
>>
>> Looking at the syzkaller dashboard for this issue, it looks like it
>> may have been present for some time, just difficult to reproduce
>> reliably (although it does appear to be occurring more often
>> recently).  Any ideas about a root cause?
>>
>>> <2> 9       No    general protection fault in smack_inode_permission
>>>                   https://syzkaller.appspot.com/bug?extid=4ac565a7081cc43bb185
>> Casey?
> Looks like an xattr or mount problem in JFS. I will have a look at it.

There's a private inode check in SELinux that didn't make it into Smack.
Looks like that should be in the infrastructure instead of the individual
modules. I have a patch in process.

>
>>> <3> 3       Yes   WARNING in current_check_refer_path
>>>                   https://syzkaller.appspot.com/bug?extid=34b68f850391452207df
>> Based on the discussion over the summer I believe the consensus was
>> that this is a bcachefs/VFS bug, reassigning to bcachefs (or trying to
>> anyway).
>>
>> https://lore.kernel.org/all/000000000000a65b35061cffca61@google.com/
>>