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crypto: algif - suppress sending source address information in recvmsg 

The current code does not set the msg_namelen member to 0 and therefore
makes net/socket.c leak the local sockaddr_storage variable to userland
-- 128 bytes of kernel stack memory. Fix that.

Cc: <stable@vger.kernel.org> # 2.6.38
Signed-off-by: Mathias Krause <minipli@googlemail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Mathias Krause 2013-04-07 14:05:39 +02:00 committed by Herbert Xu
parent d47cbd5bce
commit 72a763d805
2 changed files with 3 additions and 0 deletions
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2
crypto/algif_hash.c
View File

@ -161,6 +161,8 @@ static int hash_recvmsg(struct kiocb *unused, struct socket *sock,
else if (len < ds)
msg->msg_flags |= MSG_TRUNC;
msg->msg_namelen = 0;
lock_sock(sk);
if (ctx->more) {
ctx->more = 0;

1
crypto/algif_skcipher.c
View File

@ -432,6 +432,7 @@ static int skcipher_recvmsg(struct kiocb *unused, struct socket *sock,
long copied = 0;
lock_sock(sk);
msg->msg_namelen = 0;
for (iov = msg->msg_iov, iovlen = msg->msg_iovlen; iovlen > 0;
iovlen--, iov++) {
unsigned long seglen = iov->iov_len;