linux-kernel - [PATCH v2] selinuxfs: use scnprinft to get real length for inode

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Message-Id: <1578361158-27940-1-git-send-email-liuyang34@xiaomi.com>
Date:   Tue,  7 Jan 2020 09:39:18 +0800
From:   liuyang34 <yangliuxm34@...il.com>
To:     Paul Moore <paul@...l-moore.com>,
        Stephen Smalley <sds@...ho.nsa.gov>,
        Eric Paris <eparis@...isplace.org>, selinux@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     liuyang34 <liuyang34@...omi.com>
Subject: [PATCH v2] selinuxfs: use scnprinft to get real length for inode

as the return value of snprintf maybe over the size of TMPBUFLEN, use scnprintf
to instead of it in sel_read_class and sel_read_perm

Signed-off-by: liuyang34 <liuyang34@...omi.com>
---
 security/selinux/selinuxfs.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c
index ee94fa4..376d2c0e 100644
--- a/security/selinux/selinuxfs.c
+++ b/security/selinux/selinuxfs.c
@@ -1672,7 +1672,7 @@ static ssize_t sel_read_class(struct file *file, char __user *buf,
 {
 	unsigned long ino = file_inode(file)->i_ino;
 	char res[TMPBUFLEN];
-	ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_class(ino));
+	ssize_t len = scnprintf(res, sizeof(res), "%d", sel_ino_to_class(ino));
 	return simple_read_from_buffer(buf, count, ppos, res, len);
 }
 
@@ -1686,7 +1686,7 @@ static ssize_t sel_read_perm(struct file *file, char __user *buf,
 {
 	unsigned long ino = file_inode(file)->i_ino;
 	char res[TMPBUFLEN];
-	ssize_t len = snprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino));
+	ssize_t len = scnprintf(res, sizeof(res), "%d", sel_ino_to_perm(ino));
 	return simple_read_from_buffer(buf, count, ppos, res, len);
 }
 
-- 
2.7.4