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authorAl Viro <viro@zeniv.linux.org.uk>2017-06-28 01:24:21 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2017-07-04 20:14:34 +0300
commit5da028a8af38eced330332d5ae51c212e9e86242 (patch)
treedd6e88a9e04a3e47c3ff112997909a9646a0ee9f /net/compat.c
parentffb07550c76f70b8fa5e57352e7e299f4811f0a0 (diff)
downloadlinux-5da028a8af38eced330332d5ae51c212e9e86242.tar.xz
get_compat_msghdr(): get rid of field-by-field copyin
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'net/compat.c')
-rw-r--r--net/compat.c31
1 files changed, 14 insertions, 17 deletions
diff --git a/net/compat.c b/net/compat.c
index aba929e5250f..dba5e222a0e5 100644
--- a/net/compat.c
+++ b/net/compat.c
@@ -37,21 +37,16 @@ int get_compat_msghdr(struct msghdr *kmsg,
struct sockaddr __user **save_addr,
struct iovec **iov)
{
- compat_uptr_t uaddr, uiov, tmp3;
- compat_size_t nr_segs;
+ struct compat_msghdr msg;
ssize_t err;
- if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
- __get_user(uaddr, &umsg->msg_name) ||
- __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
- __get_user(uiov, &umsg->msg_iov) ||
- __get_user(nr_segs, &umsg->msg_iovlen) ||
- __get_user(tmp3, &umsg->msg_control) ||
- __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
- __get_user(kmsg->msg_flags, &umsg->msg_flags))
+ if (copy_from_user(&msg, umsg, sizeof(*umsg)))
return -EFAULT;
- if (!uaddr)
+ kmsg->msg_flags = msg.msg_flags;
+ kmsg->msg_namelen = msg.msg_namelen;
+
+ if (!msg.msg_name)
kmsg->msg_namelen = 0;
if (kmsg->msg_namelen < 0)
@@ -59,14 +54,16 @@ int get_compat_msghdr(struct msghdr *kmsg,
if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
kmsg->msg_namelen = sizeof(struct sockaddr_storage);
- kmsg->msg_control = compat_ptr(tmp3);
+
+ kmsg->msg_control = compat_ptr(msg.msg_control);
+ kmsg->msg_controllen = msg.msg_controllen;
if (save_addr)
- *save_addr = compat_ptr(uaddr);
+ *save_addr = compat_ptr(msg.msg_name);
- if (uaddr && kmsg->msg_namelen) {
+ if (msg.msg_name && kmsg->msg_namelen) {
if (!save_addr) {
- err = move_addr_to_kernel(compat_ptr(uaddr),
+ err = move_addr_to_kernel(compat_ptr(msg.msg_name),
kmsg->msg_namelen,
kmsg->msg_name);
if (err < 0)
@@ -77,13 +74,13 @@ int get_compat_msghdr(struct msghdr *kmsg,
kmsg->msg_namelen = 0;
}
- if (nr_segs > UIO_MAXIOV)
+ if (msg.msg_iovlen > UIO_MAXIOV)
return -EMSGSIZE;
kmsg->msg_iocb = NULL;
return compat_import_iovec(save_addr ? READ : WRITE,
- compat_ptr(uiov), nr_segs,
+ compat_ptr(msg.msg_iov), msg.msg_iovlen,
UIO_FASTIOV, iov, &kmsg->msg_iter);
}