[PATCH, natty and maverick] Yama: fix default relationship to check thread group

[Brad Figg]

On 03/18/2011 09:51 AM, Kees Cook wrote:
> Yet another case of a thread needing to match against the group leader.
>
> Signed-off-by: Kees Cook<kees.cook at canonical.com>
> ---
>   security/yama/yama_lsm.c |    2 ++
>   1 files changed, 2 insertions(+), 0 deletions(-)
>
> diff --git a/security/yama/yama_lsm.c b/security/yama/yama_lsm.c
> index b05f1dd..c8f3020 100644
> --- a/security/yama/yama_lsm.c
> +++ b/security/yama/yama_lsm.c
> @@ -173,6 +173,8 @@ static int task_is_descendant(struct task_struct *parent,
>
>   	rcu_read_lock();
>   	read_lock(&tasklist_lock);
> +	if (!thread_group_leader(parent))
> +		parent = parent->group_leader;
>   	while (walker->pid>  0) {
>   		if (!thread_group_leader(walker))
>   			walker = walker->group_leader;

Acked-by: Brad Figg <brad.figg at canonical.com>

-- 
Brad Figg brad.figg at canonical.com http://www.canonical.com