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fold verify_iovec() into copy_msghdr_from_user()

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... and do the same on the compat side of things.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2014-11-10 20:23:13 -05:00
parent 0844932009
commit 08adb7dabd
5 changed files with 77 additions and 112 deletions
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52
net/compat.c
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@@ -31,14 +31,18 @@
#include <asm/uaccess.h>
#include <net/compat.h>
int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg)
ssize_t get_compat_msghdr(struct msghdr *kmsg,
struct compat_msghdr __user *umsg,
struct sockaddr __user **save_addr,
struct iovec **iov)
{
compat_uptr_t tmp1, tmp2, tmp3;
compat_uptr_t uaddr, uiov, tmp3;
ssize_t err;
if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
__get_user(tmp1, &umsg->msg_name) ||
__get_user(uaddr, &umsg->msg_name) ||
__get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
__get_user(tmp2, &umsg->msg_iov) ||
__get_user(uiov, &umsg->msg_iov) ||
__get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) ||
__get_user(tmp3, &umsg->msg_control) ||
__get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
@@ -46,44 +50,32 @@ int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg)
return -EFAULT;
if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
kmsg->msg_namelen = sizeof(struct sockaddr_storage);
kmsg->msg_name = compat_ptr(tmp1);
kmsg->msg_iov = compat_ptr(tmp2);
kmsg->msg_control = compat_ptr(tmp3);
return 0;
}
/* I've named the args so it is easy to tell whose space the pointers are in. */
int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *iov,
struct sockaddr_storage *kern_address, int mode)
{
struct compat_iovec __user *p;
struct iovec *res;
int err;
if (save_addr)
*save_addr = compat_ptr(uaddr);
if (kern_msg->msg_name && kern_msg->msg_namelen) {
if (mode == WRITE) {
int err = move_addr_to_kernel(kern_msg->msg_name,
kern_msg->msg_namelen,
kern_address);
if (uaddr && kmsg->msg_namelen) {
if (!save_addr) {
err = move_addr_to_kernel(compat_ptr(uaddr),
kmsg->msg_namelen,
kmsg->msg_name);
if (err < 0)
return err;
}
kern_msg->msg_name = kern_address;
} else {
kern_msg->msg_name = NULL;
kern_msg->msg_namelen = 0;
kmsg->msg_name = NULL;
kmsg->msg_namelen = 0;
}
if (kern_msg->msg_iovlen > UIO_MAXIOV)
if (kmsg->msg_iovlen > UIO_MAXIOV)
return -EMSGSIZE;
p = (struct compat_iovec __user *)kern_msg->msg_iov;
err = compat_rw_copy_check_uvector(mode, p, kern_msg->msg_iovlen,
UIO_FASTIOV, iov, &res);
err = compat_rw_copy_check_uvector(save_addr ? READ : WRITE,
compat_ptr(uiov), kmsg->msg_iovlen,
UIO_FASTIOV, *iov, iov);
if (err >= 0)
kern_msg->msg_iov = res;
else if (res != iov)
kfree(res);
kmsg->msg_iov = *iov;
return err;
}