separate kernel- and userland-side msghdr

Kernel-side struct msghdr is (currently) using the same layout as
userland one, but it's not a one-to-one copy - even without considering
32bit compat issues, we have msg_iov, msg_name and msg_control copied
to kernel[1].  It's fairly localized, so we get away with a few functions
where that knowledge is needed (and we could shrink that set even
more).  Pretty much everything deals with the kernel-side variant and
the few places that want userland one just use a bunch of force-casts
to paper over the differences.

The thing is, kernel-side definition of struct msghdr is *not* exposed
in include/uapi - libc doesn't see it, etc.  So we can add struct user_msghdr,
with proper annotations and let the few places that ever deal with those
beasts use it for userland pointers.  Saner typechecking aside, that will
allow to change the layout of kernel-side msghdr - e.g. replace
msg_iov/msg_iovlen there with struct iov_iter, getting rid of the need
to modify the iovec as we copy data to/from it, etc.

We could introduce kernel_msghdr instead, but that would create much more
noise - the absolute majority of the instances would need to have the
type switched to kernel_msghdr and definition of struct msghdr in
include/linux/socket.h is not going to be seen by userland anyway.

This commit just introduces user_msghdr and switches the few places that
are dealing with userland-side msghdr to it.

[1] actually, it's even trickier than that - we copy msg_control for
sendmsg, but keep the userland address on recvmsg.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 16 insertions, 13 deletions

diff --git a/net/socket.c b/net/socket.c
index fe20c319a0bb..0ae8147e3acc 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -1989,8 +1989,11 @@ struct used_address {
 };
 
 static int copy_msghdr_from_user(struct msghdr *kmsg,
-                                 struct msghdr __user *umsg)
+                                 struct user_msghdr __user *umsg)
 {
+        /* We are relying on the (currently) identical layouts.  Once
+         * the kernel-side changes, this place will need to be updated
+         */
         if (copy_from_user(kmsg, umsg, sizeof(struct msghdr)))
                 return -EFAULT;
 
@@ -2005,7 +2008,7 @@ static int copy_msghdr_from_user(struct msghdr *kmsg,
         return 0;
 }
 
-static int ___sys_sendmsg(struct socket *sock, struct msghdr __user *msg,
+static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg,
                          struct msghdr *msg_sys, unsigned int flags,
                          struct used_address *used_address)
 {
@@ -2123,7 +2126,7 @@ out:
  *      BSD sendmsg interface
  */
 
-long __sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags)
+long __sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned flags)
 {
         int fput_needed, err;
         struct msghdr msg_sys;
@@ -2140,7 +2143,7 @@ out:
         return err;
 }
 
-SYSCALL_DEFINE3(sendmsg, int, fd, struct msghdr __user *, msg, unsigned int, flags)
+SYSCALL_DEFINE3(sendmsg, int, fd, struct user_msghdr __user *, msg, unsigned int, flags)
 {
         if (flags & MSG_CMSG_COMPAT)
                 return -EINVAL;
@@ -2177,7 +2180,7 @@ int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
 
         while (datagrams < vlen) {
                 if (MSG_CMSG_COMPAT & flags) {
-                        err = ___sys_sendmsg(sock, (struct msghdr __user *)compat_entry,
+                        err = ___sys_sendmsg(sock, (struct user_msghdr __user *)compat_entry,
                                              &msg_sys, flags, &used_address);
                         if (err < 0)
                                 break;
@@ -2185,7 +2188,7 @@ int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
                         ++compat_entry;
                 } else {
                         err = ___sys_sendmsg(sock,
-                                             (struct msghdr __user *)entry,
+                                             (struct user_msghdr __user *)entry,
                                              &msg_sys, flags, &used_address);
                         if (err < 0)
                                 break;
@@ -2215,7 +2218,7 @@ SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg,
         return __sys_sendmmsg(fd, mmsg, vlen, flags);
 }
 
-static int ___sys_recvmsg(struct socket *sock, struct msghdr __user *msg,
+static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg,
                          struct msghdr *msg_sys, unsigned int flags, int nosec)
 {
         struct compat_msghdr __user *msg_compat =
@@ -2311,7 +2314,7 @@ out:
  *      BSD recvmsg interface
  */
 
-long __sys_recvmsg(int fd, struct msghdr __user *msg, unsigned flags)
+long __sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned flags)
 {
         int fput_needed, err;
         struct msghdr msg_sys;
@@ -2328,7 +2331,7 @@ out:
         return err;
 }
 
-SYSCALL_DEFINE3(recvmsg, int, fd, struct msghdr __user *, msg,
+SYSCALL_DEFINE3(recvmsg, int, fd, struct user_msghdr __user *, msg,
                 unsigned int, flags)
 {
         if (flags & MSG_CMSG_COMPAT)
@@ -2373,7 +2376,7 @@ int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
                  * No need to ask LSM for more than the first datagram.
                  */
                 if (MSG_CMSG_COMPAT & flags) {
-                        err = ___sys_recvmsg(sock, (struct msghdr __user *)compat_entry,
+                        err = ___sys_recvmsg(sock, (struct user_msghdr __user *)compat_entry,
                                              &msg_sys, flags & ~MSG_WAITFORONE,
                                              datagrams);
                         if (err < 0)
@@ -2382,7 +2385,7 @@ int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
                         ++compat_entry;
                 } else {
                         err = ___sys_recvmsg(sock,
-                                             (struct msghdr __user *)entry,
+                                             (struct user_msghdr __user *)entry,
                                              &msg_sys, flags & ~MSG_WAITFORONE,
                                              datagrams);
                         if (err < 0)
@@ -2571,13 +2574,13 @@ SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
                                    (int __user *)a[4]);
                 break;
         case SYS_SENDMSG:
-                err = sys_sendmsg(a0, (struct msghdr __user *)a1, a[2]);
+                err = sys_sendmsg(a0, (struct user_msghdr __user *)a1, a[2]);
                 break;
         case SYS_SENDMMSG:
                 err = sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3]);
                 break;
         case SYS_RECVMSG:
-                err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]);
+                err = sys_recvmsg(a0, (struct user_msghdr __user *)a1, a[2]);
                 break;
         case SYS_RECVMMSG:
                 err = sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3],