linux-kernel - [PATCH] net: pre-clear the returned sockaddr

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Message-ID: <20130409175024.GA19308@www.outflux.net>
Date:	Tue, 9 Apr 2013 10:50:24 -0700
From:	Kees Cook <keescook@...omium.org>
To:	linux-kernel@...r.kernel.org
Cc:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	Mathias Krause <minipli@...glemail.com>,
	Brad Spengler <spender@...ecurity.net>
Subject: [PATCH] net: pre-clear the returned sockaddr_storage variable

To avoid future stack content leaks in the various protocols, pre-clear
the returned memory.

Signed-off-by: Kees Cook <keescook@...omium.org>
Suggested-by: Brad Spengler <spender@...ecurity.net>
---
 net/socket.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/socket.c b/net/socket.c
index 88f759a..4d2af0d 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -1838,7 +1838,7 @@ SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
 	struct socket *sock;
 	struct iovec iov;
 	struct msghdr msg;
-	struct sockaddr_storage address;
+	struct sockaddr_storage address = { };
 	int err, err2;
 	int fput_needed;
 
@@ -2185,7 +2185,7 @@ static int __sys_recvmsg(struct socket *sock, struct msghdr __user *msg,
 	int err, total_len, len;
 
 	/* kernel mode address */
-	struct sockaddr_storage addr;
+	struct sockaddr_storage addr = { };
 
 	/* user mode address pointers */
 	struct sockaddr __user *uaddr;
-- 
1.7.9.5


-- 
Kees Cook
Chrome OS Security
--
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