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Diffstat (limited to 'kernel/ptrace.c')
-rw-r--r--kernel/ptrace.c12
1 files changed, 7 insertions, 5 deletions
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 282821557183..e82c15cadd6d 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -39,6 +39,9 @@ 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();
}
/**
@@ -71,12 +74,16 @@ 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);
clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
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);
child->ptrace = 0;
@@ -326,11 +333,6 @@ static int ptrace_attach(struct task_struct *task, long request,
task_lock(task);
retval = __ptrace_may_access(task, PTRACE_MODE_ATTACH_REALCREDS);
- if (!retval) {
- struct mm_struct *mm = task->mm;
- if (mm && ns_capable(mm->user_ns, CAP_SYS_PTRACE))
- flags |= PT_PTRACE_CAP;
- }
task_unlock(task);
if (retval)
goto unlock_creds;