Maybe it's easier for us to understand the function of
check_kill_permission().
Signed-off-by: zhouchuangao <zhouchuan...@vivo.com>
---
kernel/signal.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/kernel/signal.c b/kernel/signal.c
index f2a1b89..e6b6277 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -823,8 +823,10 @@ static bool kill_ok_by_cred(struct task_struct *t)
}
/*
- * Bad permissions for sending the signal
- * - the caller must hold the RCU read lock
+ * Check whether the caller has permissions to send the signal.
+ * - The caller must hold the RCU read lock;
+ * - Return 0 means permission is allowed, otherwise returns the
+ * corresponding error number.
*/
static int check_kill_permission(int sig, struct kernel_siginfo *info,
struct task_struct *t)
--
2.7.4
