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-rw-r--r--kernel/ptrace.c11
1 files changed, 6 insertions, 5 deletions
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index 64191fa09b7..0692ab5a0d6 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -188,7 +188,7 @@ int ptrace_attach(struct task_struct *task)
/* Protect exec's credential calculations against our interference;
* SUID, SGID and LSM creds get determined differently under ptrace.
*/
- retval = mutex_lock_interruptible(&current->cred_exec_mutex);
+ retval = mutex_lock_interruptible(&task->cred_exec_mutex);
if (retval < 0)
goto out;
@@ -232,7 +232,7 @@ repeat:
bad:
write_unlock_irqrestore(&tasklist_lock, flags);
task_unlock(task);
- mutex_unlock(&current->cred_exec_mutex);
+ mutex_unlock(&task->cred_exec_mutex);
out:
return retval;
}
@@ -604,10 +604,11 @@ repeat:
ret = security_ptrace_traceme(current->parent);
/*
- * Set the ptrace bit in the process ptrace flags.
- * Then link us on our parent's ptraced list.
+ * Check PF_EXITING to ensure ->real_parent has not passed
+ * exit_ptrace(). Otherwise we don't report the error but
+ * pretend ->real_parent untraces us right after return.
*/
- if (!ret) {
+ if (!ret && !(current->real_parent->flags & PF_EXITING)) {
current->ptrace |= PT_PTRACED;
__ptrace_link(current, current->real_parent);
}