crypto: algif - suppress sending source address information in recvmsg

commit 72a763d805a48ac8c0bf48fdb510e84c12de51fe upstream.

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.

Signed-off-by: Mathias Krause <minipli@googlemail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/crypto/algif_hash.c b/crypto/algif_hash.c
index ef5356c..0262210 100644 (file)
--- a/crypto/algif_hash.c
+++ b/crypto/algif_hash.c
@@ -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;

diff --git a/crypto/algif_skcipher.c b/crypto/algif_skcipher.c
index 6a6dfc0..a1c4f0a 100644 (file)
--- a/crypto/algif_skcipher.c
+++ b/crypto/algif_skcipher.c
@@ -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;