linux-kernel - [PATCH] xfs: Initialize label array properly

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Message-ID: <20190830053707.GA69101@LGEARND20B15>
Date:   Fri, 30 Aug 2019 14:37:07 +0900
From:   Austin Kim <austindh.kim@...il.com>
To:     darrick.wong@...cle.com
Cc:     linux-xfs@...r.kernel.org, linux-kernel@...r.kernel.org,
        austindh.kim@...il.com
Subject: [PATCH] xfs: Initialize label array properly

In case kernel stack variable is not initialized properly,
there is a risk of kernel information disclosure.

So, initialize 'char label[]' array with null characters.

Signed-off-by: Austin Kim <austindh.kim@...il.com>
---
 fs/xfs/xfs_ioctl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index 9ea5166..09b3bee 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -2037,7 +2037,7 @@ xfs_ioc_setlabel(
 	char			__user *newlabel)
 {
 	struct xfs_sb		*sbp = &mp->m_sb;
-	char			label[XFSLABEL_MAX + 1];
+	char			label[XFSLABEL_MAX + 1] = {0};
 	size_t			len;
 	int			error;
 
-- 
2.6.2