virtio-9p: Security model for symlink and readlink

Mapped mode stores extended attributes in the user space of the extended
attributes. Given that the user space extended attributes are available
to regular files only, special files are created as regular files on the
fileserver and appropriate mode bits are added to the extended attributes.
This method presents all special files and symlinks as regular files on the
fileserver while they are represented as special files on the guest mount.

Implemntation of symlink in mapped security model:

A regular file is created and the link target is written to it.
readlink() reads it back from the file.

On Guest/Client:
lrwxrwxrwx 1 root root 6 2010-05-11 12:20 asymlink -> afile

On Host/Fileserver:
-rw-------. 1 root root 6 2010-05-11 09:20 asymlink
afile

Under passthrough model, it just calls underlying symlink() readlink()
system calls are used.

Under both security models, client user credentials are changed
after the filesystem objec creation.

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

1 files changed, 9 insertions, 4 deletions

diff --git a/hw/virtio-9p.c b/hw/virtio-9p.c
index 005f725a47..1a25e96955 100644
--- a/hw/virtio-9p.c
+++ b/hw/virtio-9p.c
@@ -199,10 +199,15 @@ static int v9fs_do_open2(V9fsState *s, V9fsCreateState *vs)
     return s->ops->open2(&s->ctx, vs->fullname.data, flags, &cred);
 }
 
-static int v9fs_do_symlink(V9fsState *s, V9fsString *oldpath,
-                            V9fsString *newpath)
+static int v9fs_do_symlink(V9fsState *s, V9fsCreateState *vs)
 {
-    return s->ops->symlink(&s->ctx, oldpath->data, newpath->data);
+    FsCred cred;
+    cred_init(&cred);
+    cred.fc_uid = vs->fidp->uid;
+    cred.fc_mode = vs->perm | 0777;
+
+    return s->ops->symlink(&s->ctx, vs->extension.data, vs->fullname.data,
+            &cred);
 }
 
 static int v9fs_do_link(V9fsState *s, V9fsString *oldpath, V9fsString *newpath)
@@ -1785,7 +1790,7 @@ static void v9fs_create_post_lstat(V9fsState *s, V9fsCreateState *vs, int err)
         err = v9fs_do_mkdir(s, vs);
         v9fs_create_post_mkdir(s, vs, err);
     } else if (vs->perm & P9_STAT_MODE_SYMLINK) {
-        err = v9fs_do_symlink(s, &vs->extension, &vs->fullname);
+        err = v9fs_do_symlink(s, vs);
         v9fs_create_post_perms(s, vs, err);
     } else if (vs->perm & P9_STAT_MODE_LINK) {
         int32_t nfid = atoi(vs->extension.data);