[PATCH] net: pre-clear the returned sockaddr_storage variable

[Kees Cook <keescook@chromium.org>]

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

Signed-off-by: Kees Cook <keescook@chromium.org>
Suggested-by: Brad Spengler <spender@grsecurity.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