[apparmor] security_path hooks for xattr

[Casey Schaufler]

On 1/26/2012 4:45 AM, Miklos Szeredi wrote:
> Forwarding from an internal bug report:
>
>     "AppArmor does not mediate the xattr system calls for confined processes.
>
>     As a consequence, a confined process can cross the confinement privilege
>     boundary by reading or writing to extended attributes that the confined
>     task should not have access to. The restrictions for security and user
>     attributes read and write still apply according to DAC; however, this
>     does not comply with the claim of AppArmor to mediate fipe
>     operations. The use of extended attributes is very flexible, so that the
>     effect of a missing mediation can lead to false assumptions in
>     subsequent policy decisions (eCryptfs)."
>
> AFAIU this boils down to missing security hooks in *xattr().
>
> Would it be possible to add these hooks?

Please post proposed patches to linux-security-module at vger.kernel.org


>
> Thanks,
> Miklos
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