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authorAl Viro <viro@zeniv.linux.org.uk>2015-03-21 19:29:06 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2015-04-09 00:02:26 -0400
commitda18428498fb24438a23d982259461fe22bc1f46 (patch)
tree37efb94c71802ac8aa9ebf4c443b63aefc809479
parent602bd0e90e14c0b50246b361290dbbbe551ada98 (diff)
downloadlinux-da18428498fb24438a23d982259461fe22bc1f46.tar.bz2
net: switch importing msghdr from userland to {compat_,}import_iovec()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
-rw-r--r--include/net/compat.h2
-rw-r--r--net/compat.c18
-rw-r--r--net/socket.c31
3 files changed, 20 insertions, 31 deletions
diff --git a/include/net/compat.h b/include/net/compat.h
index 42a9c8431177..48103cf94e97 100644
--- a/include/net/compat.h
+++ b/include/net/compat.h
@@ -40,7 +40,7 @@ int compat_sock_get_timestampns(struct sock *, struct timespec __user *);
#define compat_mmsghdr mmsghdr
#endif /* defined(CONFIG_COMPAT) */
-ssize_t get_compat_msghdr(struct msghdr *, struct compat_msghdr __user *,
+int get_compat_msghdr(struct msghdr *, struct compat_msghdr __user *,
struct sockaddr __user **, struct iovec **);
asmlinkage long compat_sys_sendmsg(int, struct compat_msghdr __user *,
unsigned int);
diff --git a/net/compat.c b/net/compat.c
index c4b6b0f43d5d..5cfd26a0006f 100644
--- a/net/compat.c
+++ b/net/compat.c
@@ -31,10 +31,10 @@
#include <asm/uaccess.h>
#include <net/compat.h>
-ssize_t get_compat_msghdr(struct msghdr *kmsg,
- struct compat_msghdr __user *umsg,
- struct sockaddr __user **save_addr,
- struct iovec **iov)
+int get_compat_msghdr(struct msghdr *kmsg,
+ struct compat_msghdr __user *umsg,
+ struct sockaddr __user **save_addr,
+ struct iovec **iov)
{
compat_uptr_t uaddr, uiov, tmp3;
compat_size_t nr_segs;
@@ -81,13 +81,9 @@ ssize_t get_compat_msghdr(struct msghdr *kmsg,
kmsg->msg_iocb = NULL;
- err = compat_rw_copy_check_uvector(save_addr ? READ : WRITE,
- compat_ptr(uiov), nr_segs,
- UIO_FASTIOV, *iov, iov);
- if (err >= 0)
- iov_iter_init(&kmsg->msg_iter, save_addr ? READ : WRITE,
- *iov, nr_segs, err);
- return err;
+ return compat_import_iovec(save_addr ? READ : WRITE,
+ compat_ptr(uiov), nr_segs,
+ UIO_FASTIOV, iov, &kmsg->msg_iter);
}
/* Bleech... */
diff --git a/net/socket.c b/net/socket.c
index 46f0e1d752b3..e5669cee0759 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -1841,10 +1841,10 @@ struct used_address {
unsigned int name_len;
};
-static ssize_t copy_msghdr_from_user(struct msghdr *kmsg,
- struct user_msghdr __user *umsg,
- struct sockaddr __user **save_addr,
- struct iovec **iov)
+static int copy_msghdr_from_user(struct msghdr *kmsg,
+ struct user_msghdr __user *umsg,
+ struct sockaddr __user **save_addr,
+ struct iovec **iov)
{
struct sockaddr __user *uaddr;
struct iovec __user *uiov;
@@ -1890,13 +1890,8 @@ static ssize_t copy_msghdr_from_user(struct msghdr *kmsg,
kmsg->msg_iocb = NULL;
- err = rw_copy_check_uvector(save_addr ? READ : WRITE,
- uiov, nr_segs,
- UIO_FASTIOV, *iov, iov);
- if (err >= 0)
- iov_iter_init(&kmsg->msg_iter, save_addr ? READ : WRITE,
- *iov, nr_segs, err);
- return err;
+ return import_iovec(save_addr ? READ : WRITE, uiov, nr_segs,
+ UIO_FASTIOV, iov, &kmsg->msg_iter);
}
static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg,
@@ -1921,8 +1916,8 @@ static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg,
else
err = copy_msghdr_from_user(msg_sys, msg, NULL, &iov);
if (err < 0)
- goto out_freeiov;
- total_len = err;
+ return err;
+ total_len = iov_iter_count(&msg_sys->msg_iter);
err = -ENOBUFS;
@@ -1988,8 +1983,7 @@ out_freectl:
if (ctl_buf != ctl)
sock_kfree_s(sock->sk, ctl_buf, ctl_len);
out_freeiov:
- if (iov != iovstack)
- kfree(iov);
+ kfree(iov);
return err;
}
@@ -2114,8 +2108,8 @@ static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg,
else
err = copy_msghdr_from_user(msg_sys, msg, &uaddr, &iov);
if (err < 0)
- goto out_freeiov;
- total_len = err;
+ return err;
+ total_len = iov_iter_count(&msg_sys->msg_iter);
cmsg_ptr = (unsigned long)msg_sys->msg_control;
msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
@@ -2153,8 +2147,7 @@ static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg,
err = len;
out_freeiov:
- if (iov != iovstack)
- kfree(iov);
+ kfree(iov);
return err;
}