| From | Luis Henriques <> | Subject | [PATCH 012/118] crypto: algif - suppress sending source address information in recvmsg | Date | Tue, 7 May 2013 14:37:38 +0100 |
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3.5.7.12 -stable review patch. If anyone has any objections, please let me know.
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From: Mathias Krause <minipli@googlemail.com>
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: Luis Henriques <luis.henriques@canonical.com> --- crypto/algif_hash.c | 2 ++ crypto/algif_skcipher.c | 1 + 2 files changed, 3 insertions(+)
diff --git a/crypto/algif_hash.c b/crypto/algif_hash.c index ef5356c..0262210 100644 --- 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 --- 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; -- 1.8.1.2
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