linux-kernel - Re: [syzbot] [mm?] possible deadlock in upgrade_mmap_lock

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Message-ID: <66fdf42e.050a0220.28a3b.01f3.GAE@google.com>
Date: Wed, 02 Oct 2024 18:32:30 -0700
From: syzbot <syzbot+a6456f6334aa19425886@...kaller.appspotmail.com>
To: paul@...l-moore.com
Cc: akpm@...ux-foundation.org, ebpqwerty472123@...il.com, hughd@...gle.com, 
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, paul@...l-moore.com, 
	stephen.smalley.work@...il.com, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [mm?] possible deadlock in upgrade_mmap_lock_carefully

> On Wed, Oct 2, 2024 at 8:14 AM Shu Han <ebpqwerty472123@...il.com> wrote:
>>
>> It seems to be the same as [1].
>> New LSM hook position for remap_file_pages + IMA = deadlock.
>> The new LSM hook position is added for a bypass caused by
>> no check in remap_file_pages + READ_IMPLIES_EXEC in do_mmap.
>
> Thanks Shu Han, let's mark this as a dup and sort out a fix in the first report.
>
> #syz dup: [syzbot] [integrity?] [lsm?] possible deadlock in

can't find the dup bug

> process_measurement (4)
>
>> I suggest fix it by removing the check and moving READ_IMPLIES_EXEC
>> out of do_mmap[2].
>>
>> Link: https://lore.kernel.org/lkml/20240928065620.7abadb2d8552f03d785c77c9@linux-foundation.org/
>> [1]
>> Link: https://lore.kernel.org/all/20240928180044.50-1-ebpqwerty472123@gmail.com/
>> [2]
>
> -- 
> paul-moore.com