Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security

Pull security subsystem updates from James Morris:
 "New notable features:
   - The seccomp work from Will Drewry
   - PR_{GET,SET}_NO_NEW_PRIVS from Andy Lutomirski
   - Longer security labels for Smack from Casey Schaufler
   - Additional ptrace restriction modes for Yama by Kees Cook"

Fix up trivial context conflicts in arch/x86/Kconfig and include/linux/filter.h

* 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security: (65 commits)
  apparmor: fix long path failure due to disconnected path
  apparmor: fix profile lookup for unconfined
  ima: fix filename hint to reflect script interpreter name
  KEYS: Don't check for NULL key pointer in key_validate()
  Smack: allow for significantly longer Smack labels v4
  gfp flags for security_inode_alloc()?
  Smack: recursive tramsmute
  Yama: replace capable() with ns_capable()
  TOMOYO: Accept manager programs which do not start with / .
  KEYS: Add invalidation support
  KEYS: Do LRU discard in full keyrings
  KEYS: Permit in-place link replacement in keyring list
  KEYS: Perform RCU synchronisation on keys prior to key destruction
  KEYS: Announce key type (un)registration
  KEYS: Reorganise keys Makefile
  KEYS: Move the key config into security/keys/Kconfig
  KEYS: Use the compat keyctl() syscall wrapper on Sparc64 for Sparc32 compat
  Yama: remove an unused variable
  samples/seccomp: fix dependencies on arch macros
  Yama: add additional ptrace scopes
  ...

fs/exec.c

@@ -1245,6 +1245,13 @@ static int check_unsafe_exec(struct linux_binprm *bprm)
 			bprm->unsafe |= LSM_UNSAFE_PTRACE;
 	}
 
+	/*
+	 * This isn't strictly necessary, but it makes it harder for LSMs to
+	 * mess up.
+	 */
+	if (current->no_new_privs)
+		bprm->unsafe |= LSM_UNSAFE_NO_NEW_PRIVS;
+
 	n_fs = 1;
 	spin_lock(&p->fs->lock);
 	rcu_read_lock();
@@ -1288,7 +1295,8 @@ int prepare_binprm(struct linux_binprm *bprm)
 	bprm->cred->euid = current_euid();
 	bprm->cred->egid = current_egid();
 
-	if (!(bprm->file->f_path.mnt->mnt_flags & MNT_NOSUID)) {
+	if (!(bprm->file->f_path.mnt->mnt_flags & MNT_NOSUID) &&
+	    !current->no_new_privs) {
 		/* Set-uid? */
 		if (mode & S_ISUID) {
 			bprm->per_clear |= PER_CLEAR_ON_SETID;

fs/open.c

@@ -681,7 +681,7 @@ static struct file *__dentry_open(struct dentry *dentry, struct vfsmount *mnt,
 
 	f->f_op = fops_get(inode->i_fop);
 
-	error = security_dentry_open(f, cred);
+	error = security_file_open(f, cred);
 	if (error)
 		goto cleanup_all;