summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorAl Viro <viro@zeniv.linux.org.uk>2015-03-22 00:56:16 +0100
committerAl Viro <viro@zeniv.linux.org.uk>2015-04-09 06:02:34 +0200
commit6aa248145ab0b1809de2411cf129ec1fc315a46f (patch)
tree264f1d52216a267aea823443e728771c9a35a400
parentnet: switch importing msghdr from userland to {compat_,}import_iovec() (diff)
downloadlinux-6aa248145ab0b1809de2411cf129ec1fc315a46f.tar.xz
linux-6aa248145ab0b1809de2411cf129ec1fc315a46f.zip
switch kernel_sendmsg() and kernel_recvmsg() to iov_iter_kvec()
For kernel_sendmsg() that eliminates the need to play with setfs(); for kernel_recvmsg() it does *not* - a couple of callers are using it with non-NULL ->msg_control, which would be treated as userland address on recvmsg side of things. In all cases we are really setting a kvec-backed iov_iter, though. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
-rw-r--r--net/socket.c20
1 files changed, 3 insertions, 17 deletions
diff --git a/net/socket.c b/net/socket.c
index e5669cee0759..b6ceeda65214 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -627,18 +627,8 @@ EXPORT_SYMBOL(sock_sendmsg);
int kernel_sendmsg(struct socket *sock, struct msghdr *msg,
struct kvec *vec, size_t num, size_t size)
{
- mm_segment_t oldfs = get_fs();
- int result;
-
- set_fs(KERNEL_DS);
- /*
- * the following is safe, since for compiler definitions of kvec and
- * iovec are identical, yielding the same in-core layout and alignment
- */
- iov_iter_init(&msg->msg_iter, WRITE, (struct iovec *)vec, num, size);
- result = sock_sendmsg(sock, msg, size);
- set_fs(oldfs);
- return result;
+ iov_iter_kvec(&msg->msg_iter, WRITE | ITER_KVEC, vec, num, size);
+ return sock_sendmsg(sock, msg, size);
}
EXPORT_SYMBOL(kernel_sendmsg);
@@ -755,12 +745,8 @@ int kernel_recvmsg(struct socket *sock, struct msghdr *msg,
mm_segment_t oldfs = get_fs();
int result;
+ iov_iter_kvec(&msg->msg_iter, READ | ITER_KVEC, vec, num, size);
set_fs(KERNEL_DS);
- /*
- * the following is safe, since for compiler definitions of kvec and
- * iovec are identical, yielding the same in-core layout and alignment
- */
- iov_iter_init(&msg->msg_iter, READ, (struct iovec *)vec, num, size);
result = sock_recvmsg(sock, msg, size, flags);
set_fs(oldfs);
return result;