[PATCH] audit_tree: keep inode pinned

[Miklos Szeredi]

On Wed, Nov 5, 2014 at 5:58 PM, Richard Guy Briggs <rgb at redhat.com> wrote:
> On 14/11/04, Miklos Szeredi wrote:
>> From: Miklos Szeredi <mszeredi at suse.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