virtio-9p: Implement Security model for mksock using mknod.

This patch uses mknod to create socket.

On Host/Fileserver:
-rw-------. 1 virfsuid virtfsgid 0 2010-05-11 09:57 asocket1

On Guest/Client:
srwxr-xr-x 1 guestuser guestuser 0 2010-05-11 12:57 asocket1

Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

hw/file-op-9p.h

@@ -52,7 +52,6 @@ typedef struct FileOperations
     int (*chmod)(FsContext *, const char *, FsCred *);
     int (*chown)(FsContext *, const char *, FsCred *);
     int (*mknod)(FsContext *, const char *, FsCred *);
-    int (*mksock)(FsContext *, const char *);
     int (*utime)(FsContext *, const char *, const struct utimbuf *);
     int (*remove)(FsContext *, const char *);
     int (*symlink)(FsContext *, const char *, const char *, FsCred *);

hw/virtio-9p-local.c

@@ -230,28 +230,6 @@ err_end:
     return err;
 }
 
-static int local_mksock(FsContext *ctx2, const char *path)
-{
-    struct sockaddr_un addr;
-    int s;
-
-    addr.sun_family = AF_UNIX;
-    snprintf(addr.sun_path, 108, "%s", rpath(ctx2, path));
-
-    s = socket(PF_UNIX, SOCK_STREAM, 0);
-    if (s == -1) {
-        return -1;
-    }
-
-    if (bind(s, (struct sockaddr *)&addr, sizeof(addr))) {
-        close(s);
-        return -1;
-    }
-
-    close(s);
-    return 0;
-}
-
 static int local_mkdir(FsContext *fs_ctx, const char *path, FsCred *credp)
 {
     int err = -1;
@@ -507,7 +485,6 @@ FileOperations local_ops = {
     .writev = local_writev,
     .chmod = local_chmod,
     .mknod = local_mknod,
-    .mksock = local_mksock,
     .mkdir = local_mkdir,
     .fstat = local_fstat,
     .open2 = local_open2,

hw/virtio-9p.c

@@ -171,11 +171,6 @@ static int v9fs_do_mknod(V9fsState *s, V9fsCreateState *vs, mode_t mode,
     return s->ops->mknod(&s->ctx, vs->fullname.data, &cred);
 }
 
-static int v9fs_do_mksock(V9fsState *s, V9fsString *path)
-{
-    return s->ops->mksock(&s->ctx, path->data);
-}
-
 static int v9fs_do_mkdir(V9fsState *s, V9fsCreateState *vs)
 {
     FsCred cred;
@@ -1740,22 +1735,6 @@ out:
     v9fs_post_create(s, vs, err);
 }
 
-static void v9fs_create_post_mksock(V9fsState *s, V9fsCreateState *vs,
-                                                                int err)
-{
-    if (err) {
-        err = -errno;
-        goto out;
-    }
-
-    err = v9fs_do_chmod(s, &vs->fullname, vs->perm & 0777);
-    v9fs_create_post_perms(s, vs, err);
-    return;
-
-out:
-    v9fs_post_create(s, vs, err);
-}
-
 static void v9fs_create_post_fstat(V9fsState *s, V9fsCreateState *vs, int err)
 {
     if (err) {
@@ -1837,8 +1816,8 @@ static void v9fs_create_post_lstat(V9fsState *s, V9fsCreateState *vs, int err)
         err = v9fs_do_mknod(s, vs, S_IFIFO | (vs->perm & 0777), 0);
         v9fs_post_create(s, vs, err);
     } else if (vs->perm & P9_STAT_MODE_SOCKET) {
-        err = v9fs_do_mksock(s, &vs->fullname);
+        err = v9fs_do_mknod(s, vs, S_IFSOCK | (vs->perm & 0777), 0);
-        v9fs_create_post_mksock(s, vs, err);
+        v9fs_post_create(s, vs, err);
     } else {
         vs->fidp->fd = v9fs_do_open2(s, vs);
         v9fs_create_post_open2(s, vs, err);