diff options
| author | David S. Miller <davem@davemloft.net> | 2010-09-27 20:24:54 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-09-27 20:24:54 -0700 |
| commit | 01db403cf99f739f86903314a489fb420e0e254f (patch) | |
| tree | bf04fbfb3ed88d6cf7abeea1ab5209be36907882 | |
| parent | 0b20406cda621c2495d10baab1e87127ceb43337 (diff) | |
| download | linux-3.10-01db403cf99f739f86903314a489fb420e0e254f.tar.gz linux-3.10-01db403cf99f739f86903314a489fb420e0e254f.tar.bz2 linux-3.10-01db403cf99f739f86903314a489fb420e0e254f.zip | |
tcp: Fix >4GB writes on 64-bit.
Fixes kernel bugzilla #16603
tcp_sendmsg() truncates iov_len to an 'int' which a 4GB write to write
zero bytes, for example.
There is also the problem higher up of how verify_iovec() works. It
wants to prevent the total length from looking like an error return
value.
However it does this using 'int', but syscalls return 'long' (and
thus signed 64-bit on 64-bit machines). So it could trigger
false-positives on 64-bit as written. So fix it to use 'long'.
Reported-by: Olaf Bonorden <bono@onlinehome.de>
Reported-by: Daniel Büse <dbuese@gmx.de>
Reported-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | include/linux/socket.h | 2 | ||||
| -rw-r--r-- | net/core/iovec.c | 5 | ||||
| -rw-r--r-- | net/ipv4/tcp.c | 2 |
3 files changed, 5 insertions, 4 deletions
diff --git a/include/linux/socket.h b/include/linux/socket.h index a2fada9becb..a8f56e1ec76 100644 --- a/include/linux/socket.h +++ b/include/linux/socket.h @@ -322,7 +322,7 @@ extern int csum_partial_copy_fromiovecend(unsigned char *kdata, int offset, unsigned int len, __wsum *csump); -extern int verify_iovec(struct msghdr *m, struct iovec *iov, struct sockaddr *address, int mode); +extern long verify_iovec(struct msghdr *m, struct iovec *iov, struct sockaddr *address, int mode); extern int memcpy_toiovec(struct iovec *v, unsigned char *kdata, int len); extern int memcpy_toiovecend(const struct iovec *v, unsigned char *kdata, int offset, int len); diff --git a/net/core/iovec.c b/net/core/iovec.c index 1cd98df412d..e6b133b77cc 100644 --- a/net/core/iovec.c +++ b/net/core/iovec.c @@ -35,9 +35,10 @@ * in any case. */ -int verify_iovec(struct msghdr *m, struct iovec *iov, struct sockaddr *address, int mode) +long verify_iovec(struct msghdr *m, struct iovec *iov, struct sockaddr *address, int mode) { - int size, err, ct; + int size, ct; + long err; if (m->msg_namelen) { if (mode == VERIFY_READ) { diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 95d75d44392..f115ea68a4e 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -943,7 +943,7 @@ int tcp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, sg = sk->sk_route_caps & NETIF_F_SG; while (--iovlen >= 0) { - int seglen = iov->iov_len; + size_t seglen = iov->iov_len; unsigned char __user *from = iov->iov_base; iov++; |