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-rw-r--r--include/linux/ptrace.h1
-rw-r--r--kernel/ptrace.c9
2 files changed, 8 insertions, 2 deletions
diff --git a/include/linux/ptrace.h b/include/linux/ptrace.h
index 98b93ca4db0..1a2b0cb5553 100644
--- a/include/linux/ptrace.h
+++ b/include/linux/ptrace.h
@@ -94,6 +94,7 @@ extern void ptrace_notify(int exit_code);
extern void __ptrace_link(struct task_struct *child,
struct task_struct *new_parent);
extern void __ptrace_unlink(struct task_struct *child);
+extern int __ptrace_detach(struct task_struct *tracer, struct task_struct *p);
extern void ptrace_fork(struct task_struct *task, unsigned long clone_flags);
#define PTRACE_MODE_READ 1
#define PTRACE_MODE_ATTACH 2
diff --git a/kernel/ptrace.c b/kernel/ptrace.c
index f62a568e84e..ee553b6ad12 100644
--- a/kernel/ptrace.c
+++ b/kernel/ptrace.c
@@ -237,6 +237,8 @@ out:
int ptrace_detach(struct task_struct *child, unsigned int data)
{
+ int dead = 0;
+
if (!valid_signal(data))
return -EIO;
@@ -244,18 +246,21 @@ int ptrace_detach(struct task_struct *child, unsigned int data)
ptrace_disable(child);
clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
- /* protect against de_thread()->release_task() */
write_lock_irq(&tasklist_lock);
+ /* protect against de_thread()->release_task() */
if (child->ptrace) {
child->exit_code = data;
- __ptrace_unlink(child);
+ dead = __ptrace_detach(current, child);
if (!child->exit_state)
wake_up_process(child);
}
write_unlock_irq(&tasklist_lock);
+ if (unlikely(dead))
+ release_task(child);
+
return 0;
}