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-rw-r--r--kernel/fork.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/kernel/fork.c b/kernel/fork.c
index 2cf74edd329..f37980df1d5 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -448,7 +448,16 @@ void mm_release(struct task_struct *tsk, struct mm_struct *mm)
tsk->vfork_done = NULL;
complete(vfork_done);
}
- if (tsk->clear_child_tid && atomic_read(&mm->mm_users) > 1) {
+
+ /*
+ * If we're exiting normally, clear a user-space tid field if
+ * requested. We leave this alone when dying by signal, to leave
+ * the value intact in a core dump, and to save the unnecessary
+ * trouble otherwise. Userland only wants this done for a sys_exit.
+ */
+ if (tsk->clear_child_tid
+ && !(tsk->flags & PF_SIGNALED)
+ && atomic_read(&mm->mm_users) > 1) {
u32 __user * tidptr = tsk->clear_child_tid;
tsk->clear_child_tid = NULL;