diff options
| author | Kees Cook <kees.cook@canonical.com> | 2010-07-13 09:04:08 -0700 |
|---|---|---|
| committer | Leann Ogasawara <leann.ogasawara@canonical.com> | 2010-08-11 07:42:28 -0700 |
| commit | 3e30bcfa46d25d2be3875da680bbbeebabbd86aa (patch) | |
| tree | c8be855c962aada879bbd4097e66f807ef3ec5b0 /security | |
| parent | 4b45d8e2be4e1e786affd73a4e9379734c803d72 (diff) | |
UBUNTU: SAUCE: Yama: search for PTRACE exceptions via thread group leader
When looking for PTRACE exceptions, the thread group leader must be used
otherwise the exceptions can be missed for threaded processes.
BugLink: https://bugs.launchpad.net/bugs/603716
Signed-off-by: Kees Cook <kees.cook@canonical.com>
Signed-off-by: Leann Ogasawara <leann.ogasawara@canonical.com>
Diffstat (limited to 'security')
| -rw-r--r-- | security/yama/yama_lsm.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/security/yama/yama_lsm.c b/security/yama/yama_lsm.c index b28d9ccf25d..4a5bc1ad4b8 100644 --- a/security/yama/yama_lsm.c +++ b/security/yama/yama_lsm.c @@ -199,11 +199,19 @@ static int ptracer_exception_found(struct task_struct *tracer, struct task_struct *parent = NULL; spin_lock(&ptracer_relations_lock); + + rcu_read_lock(); + read_lock(&tasklist_lock); + if (!thread_group_leader(tracee)) + tracee = tracee->group_leader; list_for_each_entry(relation, &ptracer_relations, node) if (relation->tracee == tracee) { parent = relation->tracer; break; } + read_unlock(&tasklist_lock); + rcu_read_unlock(); + if (task_is_descendant(parent, tracer)) rc = 1; spin_unlock(&ptracer_relations_lock); |