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authorDavid S. Miller <davem@davemloft.net>2010-09-27 20:24:54 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2010-10-28 21:44:07 -0700
commit237a9f8f234fde5441f1102b8820b8425f4c1e16 (patch)
tree4955937bab9f283dd172fa97831ae04e00ff0651 /net
parent0a3f7a263b2b89e285e173073f15f70da5396063 (diff)
tcp: Fix >4GB writes on 64-bit.
[ Upstream commit 01db403cf99f739f86903314a489fb420e0e254f ] 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> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'net')
-rw-r--r--net/core/iovec.c5
-rw-r--r--net/ipv4/tcp.c2
2 files changed, 4 insertions, 3 deletions
diff --git a/net/core/iovec.c b/net/core/iovec.c
index 16ad45d4882b..8cee101bc4de 100644
--- a/net/core/iovec.c
+++ b/net/core/iovec.c
@@ -36,9 +36,10 @@
* 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 108fad073194..0a65f5b2e232 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -935,7 +935,7 @@ int tcp_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
goto out_err;
while (--iovlen >= 0) {
- int seglen = iov->iov_len;
+ size_t seglen = iov->iov_len;
unsigned char __user *from = iov->iov_base;
iov++;