[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>

2 files changed, 0 insertions, 112 deletions

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 {