* [PATCH v2] kernel/signal: Modify the comment of function check_kill_permission()
@ 2021-03-23 11:56 zhouchuangao
0 siblings, 0 replies; only message in thread
From: zhouchuangao @ 2021-03-23 11:56 UTC (permalink / raw)
To: Jens Axboe, Christian Brauner, Eric W. Biederman, Oleg Nesterov,
Thomas Gleixner, Peter Collingbourne, Zhiqiang Liu, linux-kernel
Cc: zhouchuangao
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 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
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