linux-kernel - Re: [PATCH] audit_tree: keep inode pinned

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Message-ID: <CAJfpeguyGSPp+g1SgwAY3aieB=6Z4d5qb72tOTd6oZ-2JFgsfQ@mail.gmail.com>
Date:	Wed, 5 Nov 2014 20:36:44 +0100
From:	Miklos Szeredi <miklos@...redi.hu>
To:	Richard Guy Briggs <rgb@...hat.com>
Cc:	Eric Paris <eparis@...hat.com>, Al Viro <viro@...iv.linux.org.uk>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-audit@...hat.com
Subject: Re: [PATCH] audit_tree: keep inode pinned

On Wed, Nov 5, 2014 at 5:58 PM, Richard Guy Briggs <rgb@...hat.com> wrote:
> On 14/11/04, Miklos Szeredi wrote:
>> From: Miklos Szeredi <mszeredi@...e.cz>
>
> Hi Miklos,
>
>> Audit rules disappear when an inode they watch is evicted from the cache.
>> This is likely not what we want.
>>
>> The guilty commit is "fsnotify: allow marks to not pin inodes in core",
>> which didn't take into account that audit_tree adds watches with a zero
>> mask.
>>
>> Adding any mask should fix this.
>
> Nice find!  Do you have a quick reproducer to detect this?


- reboot
- add tree rule
- echo 2 > /proc/sys/vm/drop_caches

drop_caches doesn't guarantee dropping the inode from the cache, but
after a reboot it usually does.

Thanks,
Miklos
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