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Old 03-18-2011, 04:19 PM
Kees Cook
 
Default Yama: fix default relationship to check thread group

Forgot to add the buglink for this one. It is for bug 737676.

Thanks!

On Fri, Mar 18, 2011 at 09:51:16AM -0700, Kees Cook wrote:
> Yet another case of a thread needing to match against the group leader.
>
> Signed-off-by: Kees Cook <kees.cook@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;
> --
> 1.7.4.1
>
>
> --
> Kees Cook
> Ubuntu Security Team
--
Kees Cook
Ubuntu Security Team

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