[PATCH] Remove security_inode_post_create/mkdir/symlink/mknod hooks

This patch removes the inode_post_create/mkdir/mknod/symlink LSM hooks as
they are obsoleted by the new inode_init_security hook that enables atomic
inode security labeling.

If anyone sees any reason to retain these hooks, please speak now.  Also,
is anyone using the post_rename/link hooks; if not, those could also be
removed.

Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

5 files changed, 4 insertions, 242 deletions

diff --git a/fs/namei.c b/fs/namei.c
index 145e852c4bd0..993a65a7d570 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1316,10 +1316,8 @@ int vfs_create(struct inode *dir, struct dentry *dentry, int mode,
                 return error;
         DQUOT_INIT(dir);
         error = dir->i_op->create(dir, dentry, mode, nd);
-        if (!error) {
+        if (!error)
                 fsnotify_create(dir, dentry->d_name.name);
-                security_inode_post_create(dir, dentry, mode);
-        }
         return error;
 }
 
@@ -1635,10 +1633,8 @@ int vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
 
         DQUOT_INIT(dir);
         error = dir->i_op->mknod(dir, dentry, mode, dev);
-        if (!error) {
+        if (!error)
                 fsnotify_create(dir, dentry->d_name.name);
-                security_inode_post_mknod(dir, dentry, mode, dev);
-        }
         return error;
 }
 
@@ -1708,10 +1704,8 @@ int vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 
         DQUOT_INIT(dir);
         error = dir->i_op->mkdir(dir, dentry, mode);
-        if (!error) {
+        if (!error)
                 fsnotify_mkdir(dir, dentry->d_name.name);
-                security_inode_post_mkdir(dir,dentry, mode);
-        }
         return error;
 }
 
@@ -1947,10 +1941,8 @@ int vfs_symlink(struct inode *dir, struct dentry *dentry, const char *oldname, i
 
         DQUOT_INIT(dir);
         error = dir->i_op->symlink(dir, dentry, oldname);
-        if (!error) {
+        if (!error)
                 fsnotify_create(dir, dentry->d_name.name);
-                security_inode_post_symlink(dir, dentry, oldname);
-        }
         return error;
 }
 
diff --git a/include/linux/security.h b/include/linux/security.h
index d4f3b7a94ea6..875225bf8986 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -275,12 +275,6 @@ struct swap_info_struct;
  *      @dentry contains the dentry structure for the file to be created.
  *      @mode contains the file mode of the file to be created.
  *      Return 0 if permission is granted.
- * @inode_post_create:
- *      Set the security attributes on a newly created regular file.  This hook
- *      is called after a file has been successfully created.
- *      @dir contains the inode structure of the parent directory of the new file.
- *      @dentry contains the the dentry structure for the newly created file.
- *      @mode contains the file mode.
  * @inode_link:
  *      Check permission before creating a new hard link to a file.
  *      @old_dentry contains the dentry structure for an existing link to the file.
@@ -303,13 +297,6 @@ struct swap_info_struct;
  *      @dentry contains the dentry structure of the symbolic link.
  *      @old_name contains the pathname of file.
  *      Return 0 if permission is granted.
- * @inode_post_symlink:
- *      @dir contains the inode structure of the parent directory of the new link.
- *      @dentry contains the dentry structure of new symbolic link.
- *      @old_name contains the pathname of file.
- *      Set security attributes for a newly created symbolic link.  Note that
- *      @dentry->d_inode may be NULL, since the filesystem might not
- *      instantiate the dentry (e.g. NFS).
  * @inode_mkdir:
  *      Check permissions to create a new directory in the existing directory
  *      associated with inode strcture @dir. 
@@ -317,11 +304,6 @@ struct swap_info_struct;
  *      @dentry contains the dentry structure of new directory.
  *      @mode contains the mode of new directory.
  *      Return 0 if permission is granted.
- * @inode_post_mkdir:
- *      Set security attributes on a newly created directory.
- *      @dir contains the inode structure of parent of the directory to be created.
- *      @dentry contains the dentry structure of new directory.
- *      @mode contains the mode of new directory.
  * @inode_rmdir:
  *      Check the permission to remove a directory.
  *      @dir contains the inode structure of parent of the directory to be removed.
@@ -337,13 +319,6 @@ struct swap_info_struct;
  *      @mode contains the mode of the new file.
  *      @dev contains the the device number.
  *      Return 0 if permission is granted.
- * @inode_post_mknod:
- *      Set security attributes on a newly created special file (or socket or
- *      fifo file created via the mknod system call).
- *      @dir contains the inode structure of parent of the new node.
- *      @dentry contains the dentry structure of the new node.
- *      @mode contains the mode of the new node.
- *      @dev contains the the device number.
  * @inode_rename:
  *      Check for permission to rename a file or directory.
  *      @old_dir contains the inode structure for parent of the old link.
@@ -1103,8 +1078,6 @@ struct security_operations {
                                     char **name, void **value, size_t *len);
         int (*inode_create) (struct inode *dir,
                              struct dentry *dentry, int mode);
-        void (*inode_post_create) (struct inode *dir,
-                                   struct dentry *dentry, int mode);
         int (*inode_link) (struct dentry *old_dentry,
                            struct inode *dir, struct dentry *new_dentry);
         void (*inode_post_link) (struct dentry *old_dentry,
@@ -1112,17 +1085,10 @@ struct security_operations {
         int (*inode_unlink) (struct inode *dir, struct dentry *dentry);
         int (*inode_symlink) (struct inode *dir,
                               struct dentry *dentry, const char *old_name);
-        void (*inode_post_symlink) (struct inode *dir,
-                                    struct dentry *dentry,
-                                    const char *old_name);
         int (*inode_mkdir) (struct inode *dir, struct dentry *dentry, int mode);
-        void (*inode_post_mkdir) (struct inode *dir, struct dentry *dentry, 
-                            int mode);
         int (*inode_rmdir) (struct inode *dir, struct dentry *dentry);
         int (*inode_mknod) (struct inode *dir, struct dentry *dentry,
                             int mode, dev_t dev);
-        void (*inode_post_mknod) (struct inode *dir, struct dentry *dentry,
-                                  int mode, dev_t dev);
         int (*inode_rename) (struct inode *old_dir, struct dentry *old_dentry,
                              struct inode *new_dir, struct dentry *new_dentry);
         void (*inode_post_rename) (struct inode *old_dir,
@@ -1484,15 +1450,6 @@ static inline int security_inode_create (struct inode *dir,
         return security_ops->inode_create (dir, dentry, mode);
 }
 
-static inline void security_inode_post_create (struct inode *dir,
-                                               struct dentry *dentry,
-                                               int mode)
-{
-        if (dentry->d_inode && unlikely (IS_PRIVATE (dentry->d_inode)))
-                return;
-        security_ops->inode_post_create (dir, dentry, mode);
-}
-
 static inline int security_inode_link (struct dentry *old_dentry,
                                        struct inode *dir,
                                        struct dentry *new_dentry)
@@ -1528,15 +1485,6 @@ static inline int security_inode_symlink (struct inode *dir,
         return security_ops->inode_symlink (dir, dentry, old_name);
 }
 
-static inline void security_inode_post_symlink (struct inode *dir,
-                                                struct dentry *dentry,
-                                                const char *old_name)
-{
-        if (dentry->d_inode && unlikely (IS_PRIVATE (dentry->d_inode)))
-                return;
-        security_ops->inode_post_symlink (dir, dentry, old_name);
-}
-
 static inline int security_inode_mkdir (struct inode *dir,
                                         struct dentry *dentry,
                                         int mode)
@@ -1546,15 +1494,6 @@ static inline int security_inode_mkdir (struct inode *dir,
         return security_ops->inode_mkdir (dir, dentry, mode);
 }
 
-static inline void security_inode_post_mkdir (struct inode *dir,
-                                              struct dentry *dentry,
-                                              int mode)
-{
-        if (dentry->d_inode && unlikely (IS_PRIVATE (dentry->d_inode)))
-                return;
-        security_ops->inode_post_mkdir (dir, dentry, mode);
-}
-
 static inline int security_inode_rmdir (struct inode *dir,
                                         struct dentry *dentry)
 {
@@ -1572,15 +1511,6 @@ static inline int security_inode_mknod (struct inode *dir,
         return security_ops->inode_mknod (dir, dentry, mode, dev);
 }
 
-static inline void security_inode_post_mknod (struct inode *dir,
-                                              struct dentry *dentry,
-                                              int mode, dev_t dev)
-{
-        if (dentry->d_inode && unlikely (IS_PRIVATE (dentry->d_inode)))
-                return;
-        security_ops->inode_post_mknod (dir, dentry, mode, dev);
-}
-
 static inline int security_inode_rename (struct inode *old_dir,
                                          struct dentry *old_dentry,
                                          struct inode *new_dir,
@@ -2220,11 +2150,6 @@ static inline int security_inode_create (struct inode *dir,
         return 0;
 }
 
-static inline void security_inode_post_create (struct inode *dir,
-                                               struct dentry *dentry,
-                                               int mode)
-{ }
-
 static inline int security_inode_link (struct dentry *old_dentry,
                                        struct inode *dir,
                                        struct dentry *new_dentry)
@@ -2250,11 +2175,6 @@ static inline int security_inode_symlink (struct inode *dir,
         return 0;
 }
 
-static inline void security_inode_post_symlink (struct inode *dir,
-                                                struct dentry *dentry,
-                                                const char *old_name)
-{ }
-
 static inline int security_inode_mkdir (struct inode *dir,
                                         struct dentry *dentry,
                                         int mode)
@@ -2262,11 +2182,6 @@ static inline int security_inode_mkdir (struct inode *dir,
         return 0;
 }
 
-static inline void security_inode_post_mkdir (struct inode *dir,
-                                              struct dentry *dentry,
-                                              int mode)
-{ }
-
 static inline int security_inode_rmdir (struct inode *dir,
                                         struct dentry *dentry)
 {
@@ -2280,11 +2195,6 @@ static inline int security_inode_mknod (struct inode *dir,
         return 0;
 }
 
-static inline void security_inode_post_mknod (struct inode *dir,
-                                              struct dentry *dentry,
-                                              int mode, dev_t dev)
-{ }
-
 static inline int security_inode_rename (struct inode *old_dir,
                                          struct dentry *old_dentry,
                                          struct inode *new_dir,
diff --git a/security/dummy.c b/security/dummy.c
index e8a00fa80469..5083314e14b1 100644
--- a/security/dummy.c
+++ b/security/dummy.c
@@ -270,12 +270,6 @@ static int dummy_inode_create (struct inode *inode, struct dentry *dentry,
         return 0;
 }
 
-static void dummy_inode_post_create (struct inode *inode, struct dentry *dentry,
-                                     int mask)
-{
-        return;
-}
-
 static int dummy_inode_link (struct dentry *old_dentry, struct inode *inode,
                              struct dentry *new_dentry)
 {
@@ -300,24 +294,12 @@ static int dummy_inode_symlink (struct inode *inode, struct dentry *dentry,
         return 0;
 }
 
-static void dummy_inode_post_symlink (struct inode *inode,
-                                      struct dentry *dentry, const char *name)
-{
-        return;
-}
-
 static int dummy_inode_mkdir (struct inode *inode, struct dentry *dentry,
                               int mask)
 {
         return 0;
 }
 
-static void dummy_inode_post_mkdir (struct inode *inode, struct dentry *dentry,
-                                    int mask)
-{
-        return;
-}
-
 static int dummy_inode_rmdir (struct inode *inode, struct dentry *dentry)
 {
         return 0;
@@ -329,12 +311,6 @@ static int dummy_inode_mknod (struct inode *inode, struct dentry *dentry,
         return 0;
 }
 
-static void dummy_inode_post_mknod (struct inode *inode, struct dentry *dentry,
-                                    int mode, dev_t dev)
-{
-        return;
-}
-
 static int dummy_inode_rename (struct inode *old_inode,
                                struct dentry *old_dentry,
                                struct inode *new_inode,
@@ -894,17 +870,13 @@ void security_fixup_ops (struct security_operations *ops)
         set_to_dummy_if_null(ops, inode_free_security);
         set_to_dummy_if_null(ops, inode_init_security);
         set_to_dummy_if_null(ops, inode_create);
-        set_to_dummy_if_null(ops, inode_post_create);
         set_to_dummy_if_null(ops, inode_link);
         set_to_dummy_if_null(ops, inode_post_link);
         set_to_dummy_if_null(ops, inode_unlink);
         set_to_dummy_if_null(ops, inode_symlink);
-        set_to_dummy_if_null(ops, inode_post_symlink);
         set_to_dummy_if_null(ops, inode_mkdir);
-        set_to_dummy_if_null(ops, inode_post_mkdir);
         set_to_dummy_if_null(ops, inode_rmdir);
         set_to_dummy_if_null(ops, inode_mknod);
-        set_to_dummy_if_null(ops, inode_post_mknod);
         set_to_dummy_if_null(ops, inode_rename);
         set_to_dummy_if_null(ops, inode_post_rename);
         set_to_dummy_if_null(ops, inode_readlink);
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 265f33d3af9b..c9c20828be79 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -1265,91 +1265,6 @@ static int inode_security_set_sid(struct inode *inode, u32 sid)
         return 0;
 }
 
-/* Set the security attributes on a newly created file. */
-static int post_create(struct inode *dir,
-                       struct dentry *dentry)
-{
-
-        struct task_security_struct *tsec;
-        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;
-        int rc;
-
-        tsec = current->security;
-        dsec = dir->i_security;
-        sbsec = dir->i_sb->s_security;
-
-        inode = dentry->d_inode;
-        if (!inode) {
-                /* Some file system types (e.g. NFS) may not instantiate
-                   a dentry for all create operations (e.g. symlink),
-                   so we have to check to see if the inode is non-NULL. */
-                printk(KERN_WARNING "post_create:  no inode, dir (dev=%s, "
-                       "ino=%ld)\n", dir->i_sb->s_id, dir->i_ino);
-                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 {
-                rc = security_transition_sid(tsec->sid, dsec->sid,
-                                             inode_mode_to_security_class(inode->i_mode),
-                                             &newsid);
-                if (rc) {
-                        printk(KERN_WARNING "post_create:  "
-                               "security_transition_sid failed, rc=%d (dev=%s "
-                               "ino=%ld)\n",
-                               -rc, inode->i_sb->s_id, inode->i_ino);
-                        return rc;
-                }
-        }
-
-        rc = inode_security_set_sid(inode, newsid);
-        if (rc) {
-                printk(KERN_WARNING "post_create:  inode_security_set_sid "
-                       "failed, rc=%d (dev=%s ino=%ld)\n",
-                       -rc, inode->i_sb->s_id, inode->i_ino);
-                return rc;
-        }
-
-        if (sbsec->behavior == SECURITY_FS_USE_XATTR &&
-            inode->i_op->setxattr) {
-                /* Use extended attributes. */
-                rc = security_sid_to_context(newsid, &context, &len);
-                if (rc) {
-                        printk(KERN_WARNING "post_create:  sid_to_context "
-                               "failed, rc=%d (dev=%s ino=%ld)\n",
-                               -rc, inode->i_sb->s_id, inode->i_ino);
-                        return rc;
-                }
-                down(&inode->i_sem);
-                rc = inode->i_op->setxattr(dentry,
-                                           XATTR_NAME_SELINUX,
-                                           context, len, 0);
-                up(&inode->i_sem);
-                kfree(context);
-                if (rc < 0) {
-                        printk(KERN_WARNING "post_create:  setxattr failed, "
-                               "rc=%d (dev=%s ino=%ld)\n",
-                               -rc, inode->i_sb->s_id, inode->i_ino);
-                        return rc;
-                }
-        }
-
-        return 0;
-}
-
-
 /* Hook functions begin here. */
 
 static int selinux_ptrace(struct task_struct *parent, struct task_struct *child)
@@ -2076,8 +1991,6 @@ static int selinux_inode_init_security(struct inode *inode, struct inode *dir,
                 *len = clen;
         }
 
-        isec->security_attr_init = 1;
-
         return 0;
 }
 
@@ -2086,11 +1999,6 @@ static int selinux_inode_create(struct inode *dir, struct dentry *dentry, int ma
         return may_create(dir, dentry, SECCLASS_FILE);
 }
 
-static void selinux_inode_post_create(struct inode *dir, struct dentry *dentry, int mask)
-{
-        post_create(dir, dentry);
-}
-
 static int selinux_inode_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_dentry)
 {
         int rc;
@@ -2121,21 +2029,11 @@ static int selinux_inode_symlink(struct inode *dir, struct dentry *dentry, const
         return may_create(dir, dentry, SECCLASS_LNK_FILE);
 }
 
-static void selinux_inode_post_symlink(struct inode *dir, struct dentry *dentry, const char *name)
-{
-        post_create(dir, dentry);
-}
-
 static int selinux_inode_mkdir(struct inode *dir, struct dentry *dentry, int mask)
 {
         return may_create(dir, dentry, SECCLASS_DIR);
 }
 
-static void selinux_inode_post_mkdir(struct inode *dir, struct dentry *dentry, int mask)
-{
-        post_create(dir, dentry);
-}
-
 static int selinux_inode_rmdir(struct inode *dir, struct dentry *dentry)
 {
         return may_link(dir, dentry, MAY_RMDIR);
@@ -2152,11 +2050,6 @@ static int selinux_inode_mknod(struct inode *dir, struct dentry *dentry, int mod
         return may_create(dir, dentry, inode_mode_to_security_class(mode));
 }
 
-static void selinux_inode_post_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
-{
-        post_create(dir, dentry);
-}
-
 static int selinux_inode_rename(struct inode *old_inode, struct dentry *old_dentry,
                                 struct inode *new_inode, struct dentry *new_dentry)
 {
@@ -4363,17 +4256,13 @@ static struct security_operations selinux_ops = {
         .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,
         .inode_post_link =              selinux_inode_post_link,
         .inode_unlink =                 selinux_inode_unlink,
         .inode_symlink =                selinux_inode_symlink,
-        .inode_post_symlink =           selinux_inode_post_symlink,
         .inode_mkdir =                  selinux_inode_mkdir,
-        .inode_post_mkdir =             selinux_inode_post_mkdir,
         .inode_rmdir =                  selinux_inode_rmdir,
         .inode_mknod =                  selinux_inode_mknod,
-        .inode_post_mknod =             selinux_inode_post_mknod,
         .inode_rename =                 selinux_inode_rename,
         .inode_post_rename =            selinux_inode_post_rename,
         .inode_readlink =               selinux_inode_readlink,
diff --git a/security/selinux/include/objsec.h b/security/selinux/include/objsec.h
index c515bc0b58a1..887937c8134a 100644
--- a/security/selinux/include/objsec.h
+++ b/security/selinux/include/objsec.h
@@ -46,7 +46,6 @@ struct inode_security_struct {
         unsigned char initialized;     /* initialization flag */
         struct semaphore sem;
         unsigned char inherit;         /* inherit SID from parent entry */
-        unsigned char security_attr_init; /* security attributes init flag */
 };
 
 struct file_security_struct {