diff options
author | Sabrina Dubroca <sd@queasysnail.net> | 2015-10-15 14:25:03 +0200 |
---|---|---|
committer | Willy Tarreau <w@1wt.eu> | 2015-12-06 00:49:13 +0100 |
commit | c507639ba963bb47e3f515670a7cace76af76ab6 (patch) | |
tree | 6b354bd693bc19715e7e1b554bfee09083d10263 | |
parent | 0b1b85deb213efaee4ea289cc881bb50116d1a6e (diff) |
net: add length argument to skb_copy_and_csum_datagram_iovec
Without this length argument, we can read past the end of the iovec in
memcpy_toiovec because we have no way of knowing the total length of the
iovec's buffers.
This is needed for stable kernels where 89c22d8c3b27 ("net: Fix skb
csum races when peeking") has been backported but that don't have the
ioviter conversion, which is almost all the stable trees <= 3.18.
This also fixes a kernel crash for NFS servers when the client uses
-onfsvers=3,proto=udp to mount the export.
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Reviewed-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
[bwh: Backported to 3.2: adjust context in include/linux/skbuff.h]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
(cherry picked from commit 127500d724f8c43f452610c9080444eedb5eaa6c)
Signed-off-by: Willy Tarreau <w@1wt.eu>
-rw-r--r-- | include/linux/skbuff.h | 3 | ||||
-rw-r--r-- | net/core/datagram.c | 6 | ||||
-rw-r--r-- | net/ipv4/tcp_input.c | 2 | ||||
-rw-r--r-- | net/ipv4/udp.c | 2 | ||||
-rw-r--r-- | net/ipv6/raw.c | 2 | ||||
-rw-r--r-- | net/ipv6/udp.c | 3 | ||||
-rw-r--r-- | net/rxrpc/ar-recvmsg.c | 3 |
7 files changed, 14 insertions, 7 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index ae77862160ba..c282a2cba635 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -1765,7 +1765,8 @@ extern int skb_copy_datagram_iovec(const struct sk_buff *from, int size); extern int skb_copy_and_csum_datagram_iovec(struct sk_buff *skb, int hlen, - struct iovec *iov); + struct iovec *iov, + int len); extern int skb_copy_datagram_from_iovec(struct sk_buff *skb, int offset, const struct iovec *from, diff --git a/net/core/datagram.c b/net/core/datagram.c index 253d068e8cba..767c17aaddcb 100644 --- a/net/core/datagram.c +++ b/net/core/datagram.c @@ -693,6 +693,7 @@ EXPORT_SYMBOL(__skb_checksum_complete); * @skb: skbuff * @hlen: hardware length * @iov: io vector + * @len: amount of data to copy from skb to iov * * Caller _must_ check that skb will fit to this iovec. * @@ -702,11 +703,14 @@ EXPORT_SYMBOL(__skb_checksum_complete); * can be modified! */ int skb_copy_and_csum_datagram_iovec(struct sk_buff *skb, - int hlen, struct iovec *iov) + int hlen, struct iovec *iov, int len) { __wsum csum; int chunk = skb->len - hlen; + if (chunk > len) + chunk = len; + if (!chunk) return 0; diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c index c821218b3834..d3dcfb9d736f 100644 --- a/net/ipv4/tcp_input.c +++ b/net/ipv4/tcp_input.c @@ -4985,7 +4985,7 @@ static int tcp_copy_to_iovec(struct sock *sk, struct sk_buff *skb, int hlen) err = skb_copy_datagram_iovec(skb, hlen, tp->ucopy.iov, chunk); else err = skb_copy_and_csum_datagram_iovec(skb, hlen, - tp->ucopy.iov); + tp->ucopy.iov, chunk); if (!err) { tp->ucopy.len -= chunk; diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index 3ae286b9c5ab..83b507d51968 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -975,7 +975,7 @@ try_again: else { err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), - msg->msg_iov); + msg->msg_iov, copied); if (err == -EINVAL) goto csum_copy_err; diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c index d5b09c7ca402..f016542cf849 100644 --- a/net/ipv6/raw.c +++ b/net/ipv6/raw.c @@ -476,7 +476,7 @@ static int rawv6_recvmsg(struct kiocb *iocb, struct sock *sk, goto csum_copy_err; err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); } else { - err = skb_copy_and_csum_datagram_iovec(skb, 0, msg->msg_iov); + err = skb_copy_and_csum_datagram_iovec(skb, 0, msg->msg_iov, copied); if (err == -EINVAL) goto csum_copy_err; } diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c index 0b023f35103d..5c8bd19c9572 100644 --- a/net/ipv6/udp.c +++ b/net/ipv6/udp.c @@ -233,7 +233,8 @@ try_again: err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov, copied ); else { - err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov); + err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), + msg->msg_iov, copied); if (err == -EINVAL) goto csum_copy_err; } diff --git a/net/rxrpc/ar-recvmsg.c b/net/rxrpc/ar-recvmsg.c index b6076b231b49..813e1c482e32 100644 --- a/net/rxrpc/ar-recvmsg.c +++ b/net/rxrpc/ar-recvmsg.c @@ -184,7 +184,8 @@ int rxrpc_recvmsg(struct kiocb *iocb, struct socket *sock, msg->msg_iov, copy); } else { ret = skb_copy_and_csum_datagram_iovec(skb, offset, - msg->msg_iov); + msg->msg_iov, + copy); if (ret == -EINVAL) goto csum_copy_error; } |