selinux: don't revalidate an inode's label when explicitly setting it

There is no point in attempting to revalidate an inode's security
label when we are in the process of setting it.

Reported-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: Paul Moore <paul@paul-moore.com>

1 files changed, 11 insertions, 2 deletions

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index fce7dc81f2d9..f8ecc0a3c0fa 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -297,6 +297,13 @@ static struct inode_security_struct *inode_security(struct inode *inode)
         return inode->i_security;
 }
 
+static struct inode_security_struct *backing_inode_security_novalidate(struct dentry *dentry)
+{
+        struct inode *inode = d_backing_inode(dentry);
+
+        return inode->i_security;
+}
+
 /*
  * Get the security label of a dentry's backing inode.
  */
@@ -686,7 +693,7 @@ static int selinux_set_mnt_opts(struct super_block *sb,
         struct superblock_security_struct *sbsec = sb->s_security;
         const char *name = sb->s_type->name;
         struct dentry *root = sbsec->sb->s_root;
-        struct inode_security_struct *root_isec = backing_inode_security(root);
+        struct inode_security_struct *root_isec;
         u32 fscontext_sid = 0, context_sid = 0, rootcontext_sid = 0;
         u32 defcontext_sid = 0;
         char **mount_options = opts->mnt_opts;
@@ -729,6 +736,8 @@ static int selinux_set_mnt_opts(struct super_block *sb,
             && (num_opts == 0))
                 goto out;
 
+        root_isec = backing_inode_security_novalidate(root);
+
         /*
          * parse the mount options, check if they are valid sids.
          * also check if someone is trying to mount the same sb more
@@ -3222,7 +3231,7 @@ out_nofree:
 static int selinux_inode_setsecurity(struct inode *inode, const char *name,
                                      const void *value, size_t size, int flags)
 {
-        struct inode_security_struct *isec = inode_security(inode);
+        struct inode_security_struct *isec = inode_security_novalidate(inode);
         u32 newsid;
         int rc;