diff options
Diffstat (limited to 'kernel/ptrace.c')
| -rw-r--r-- | kernel/ptrace.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/kernel/ptrace.c b/kernel/ptrace.c index 9650e7aee267..c67aab541ee2 100644 --- a/kernel/ptrace.c +++ b/kernel/ptrace.c @@ -40,6 +40,9 @@ void __ptrace_link(struct task_struct *child, struct task_struct *new_parent) BUG_ON(!list_empty(&child->ptrace_entry)); list_add(&child->ptrace_entry, &new_parent->ptraced); child->parent = new_parent; + rcu_read_lock(); + child->ptracer_cred = get_cred(__task_cred(new_parent)); + rcu_read_unlock(); } /** @@ -72,11 +75,15 @@ void __ptrace_link(struct task_struct *child, struct task_struct *new_parent) */ void __ptrace_unlink(struct task_struct *child) { + const struct cred *old_cred; BUG_ON(!child->ptrace); child->ptrace = 0; child->parent = child->real_parent; list_del_init(&child->ptrace_entry); + old_cred = child->ptracer_cred; + child->ptracer_cred = NULL; + put_cred(old_cred); spin_lock(&child->sighand->siglock); @@ -366,10 +373,6 @@ static int ptrace_attach(struct task_struct *task, long request, if (seize) flags |= PT_SEIZED; - rcu_read_lock(); - if (ns_capable(__task_cred(task)->user_ns, CAP_SYS_PTRACE)) - flags |= PT_PTRACE_CAP; - rcu_read_unlock(); task->ptrace = flags; __ptrace_link(task, current); |