diff options
Diffstat (limited to 'kernel/ptrace.c')
| -rw-r--r-- | kernel/ptrace.c | 40 |
1 files changed, 15 insertions, 25 deletions
diff --git a/kernel/ptrace.c b/kernel/ptrace.c index 745fc2dd00c5..e6098434b533 100644 --- a/kernel/ptrace.c +++ b/kernel/ptrace.c @@ -37,15 +37,23 @@ void __ptrace_link(struct task_struct *child, struct task_struct *new_parent) child->parent = new_parent; } -/* - * Turn a tracing stop into a normal stop now, since with no tracer there - * would be no way to wake it up with SIGCONT or SIGKILL. If there was a - * signal sent that would resume the child, but didn't because it was in - * TASK_TRACED, resume it now. - * Requires that irqs be disabled. +/** + * __ptrace_unlink - unlink ptracee and restore its execution state + * @child: ptracee to be unlinked + * + * Remove @child from the ptrace list, move it back to the original parent. + * + * CONTEXT: + * write_lock_irq(tasklist_lock) */ -static void ptrace_untrace(struct task_struct *child) +void __ptrace_unlink(struct task_struct *child) { + BUG_ON(!child->ptrace); + + child->ptrace = 0; + child->parent = child->real_parent; + list_del_init(&child->ptrace_entry); + spin_lock(&child->sighand->siglock); if (task_is_traced(child)) { /* @@ -70,24 +78,6 @@ static void ptrace_untrace(struct task_struct *child) } /* - * unptrace a task: move it back to its original parent and - * remove it from the ptrace list. - * - * Must be called with the tasklist lock write-held. - */ -void __ptrace_unlink(struct task_struct *child) -{ - BUG_ON(!child->ptrace); - - child->ptrace = 0; - child->parent = child->real_parent; - list_del_init(&child->ptrace_entry); - - if (task_is_traced(child)) - ptrace_untrace(child); -} - -/* * Check that we have indeed attached to the thing.. */ int ptrace_check_attach(struct task_struct *child, int kill) |