1 files changed, 59 insertions, 0 deletions

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 8641f8894b4c..63701fe0e1ad 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -1274,6 +1274,7 @@ static int post_create(struct inode *dir,
         struct inode *inode;
         struct inode_security_struct *dsec;
         struct superblock_security_struct *sbsec;
+        struct inode_security_struct *isec;
         u32 newsid;
         char *context;
         unsigned int len;
@@ -1293,6 +1294,11 @@ static int post_create(struct inode *dir,
                 return 0;
         }
 
+        isec = inode->i_security;
+
+        if (isec->security_attr_init)
+                return 0;
+
         if (tsec->create_sid && sbsec->behavior != SECURITY_FS_USE_MNTPOINT) {
                 newsid = tsec->create_sid;
         } else {
@@ -2018,6 +2024,58 @@ static void selinux_inode_free_security(struct inode *inode)
         inode_free_security(inode);
 }
 
+static int selinux_inode_init_security(struct inode *inode, struct inode *dir,
+                                       char **name, void **value,
+                                       size_t *len)
+{
+        struct task_security_struct *tsec;
+        struct inode_security_struct *dsec;
+        struct superblock_security_struct *sbsec;
+        struct inode_security_struct *isec;
+        u32 newsid;
+        int rc;
+        char *namep, *context;
+
+        tsec = current->security;
+        dsec = dir->i_security;
+        sbsec = dir->i_sb->s_security;
+        isec = inode->i_security;
+
+        if (tsec->create_sid && sbsec->behavior != SECURITY_FS_USE_MNTPOINT) {
+                newsid = tsec->create_sid;
+        } else {
+                rc = security_transition_sid(tsec->sid, dsec->sid,
+                                             inode_mode_to_security_class(inode->i_mode),
+                                             &newsid);
+                if (rc) {
+                        printk(KERN_WARNING "%s:  "
+                               "security_transition_sid failed, rc=%d (dev=%s "
+                               "ino=%ld)\n",
+                               __FUNCTION__,
+                               -rc, inode->i_sb->s_id, inode->i_ino);
+                        return rc;
+                }
+        }
+
+        inode_security_set_sid(inode, newsid);
+
+        namep = kstrdup(XATTR_SELINUX_SUFFIX, GFP_KERNEL);
+        if (!namep)
+                return -ENOMEM;
+        *name = namep;
+
+        rc = security_sid_to_context(newsid, &context, len);
+        if (rc) {
+                kfree(namep);
+                return rc;
+        }
+        *value = context;
+
+        isec->security_attr_init = 1;
+
+        return 0;
+}
+
 static int selinux_inode_create(struct inode *dir, struct dentry *dentry, int mask)
 {
         return may_create(dir, dentry, SECCLASS_FILE);
@@ -4298,6 +4356,7 @@ static struct security_operations selinux_ops = {
 
         .inode_alloc_security =         selinux_inode_alloc_security,
         .inode_free_security =          selinux_inode_free_security,
+        .inode_init_security =          selinux_inode_init_security,
         .inode_create =                 selinux_inode_create,
         .inode_post_create =            selinux_inode_post_create,
         .inode_link =                   selinux_inode_link,