keyctl_session_to_parent(): use thread_group_empty() to check singlethreadness
No functional changes.
keyctl_session_to_parent() is the only user of signal->count which needs
the correct value. Change it to use thread_group_empty() instead, this
must be strictly equivalent under tasklist, and imho looks better.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: David Howells <dhowells@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Acked-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c
index 8f4dce1..13074b4 100644
--- a/security/keys/keyctl.c
+++ b/security/keys/keyctl.c
@@ -1269,7 +1269,7 @@
goto not_permitted;
/* the parent must be single threaded */
- if (atomic_read(&parent->signal->count) != 1)
+ if (!thread_group_empty(parent))
goto not_permitted;
/* the parent and the child must have different session keyrings or