[PATCH] kernel/signal: Modify the comment of function check_kill_permission

From: zhouchuangao <zhouchuangao@vivo.com>
To: Jens Axboe <axboe@kernel.dk>, Oleg Nesterov <oleg@redhat.com>,
	"Eric W. Biederman" <ebiederm@xmission.com>,
	"Peter Zijlstra (Intel)" <peterz@infradead.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Peter Collingbourne <pcc@google.com>,
	Marco Elver <elver@google.com>,
	linux-kernel@vger.kernel.org
Cc: zhouchuangao <zhouchuangao@vivo.com>
Subject: [PATCH] kernel/signal: Modify the comment of function check_kill_permission
Date: Sun,  9 May 2021 18:26:20 -0700	[thread overview]
Message-ID: <1620609982-25340-1-git-send-email-zhouchuangao@vivo.com> (raw)

Maybe it's easier for us to understand the function of
check_kill_permission().

Signed-off-by: zhouchuangao <zhouchuangao@vivo.com>
---
 kernel/signal.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/kernel/signal.c b/kernel/signal.c
index 66e8864..8335f17 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -861,8 +861,10 @@ 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

