Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6: (105 commits)
  SELinux: don't check permissions for kernel mounts
  security: pass mount flags to security_sb_kern_mount()
  SELinux: correctly detect proc filesystems of the form "proc/foo"
  Audit: Log TIOCSTI
  user namespaces: document CFS behavior
  user namespaces: require cap_set{ug}id for CLONE_NEWUSER
  user namespaces: let user_ns be cloned with fairsched
  CRED: fix sparse warnings
  User namespaces: use the current_user_ns() macro
  User namespaces: set of cleanups (v2)
  nfsctl: add headers for credentials
  coda: fix creds reference
  capabilities: define get_vfs_caps_from_disk when file caps are not enabled
  CRED: Allow kernel services to override LSM settings for task actions
  CRED: Add a kernel_service object class to SELinux
  CRED: Differentiate objective and effective subjective credentials on a task
  CRED: Documentation
  CRED: Use creds in file structs
  CRED: Prettify commoncap.c
  CRED: Make execve() take advantage of copy-on-write credentials
  ...

1 files changed, 24 insertions, 18 deletions

diff --git a/fs/compat.c b/fs/compat.c
index e5f49f538502..d1ece79b6411 100644
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -1393,10 +1393,20 @@ int compat_do_execve(char * filename,
 	if (!bprm)
 		goto out_ret;
 
+	retval = mutex_lock_interruptible(&current->cred_exec_mutex);
+	if (retval < 0)
+		goto out_free;
+
+	retval = -ENOMEM;
+	bprm->cred = prepare_exec_creds();
+	if (!bprm->cred)
+		goto out_unlock;
+	check_unsafe_exec(bprm);
+
 	file = open_exec(filename);
 	retval = PTR_ERR(file);
 	if (IS_ERR(file))
-		goto out_kfree;
+		goto out_unlock;
 
 	sched_exec();
 
@@ -1410,14 +1420,10 @@ int compat_do_execve(char * filename,
 
 	bprm->argc = compat_count(argv, MAX_ARG_STRINGS);
 	if ((retval = bprm->argc) < 0)
-		goto out_mm;
+		goto out;
 
 	bprm->envc = compat_count(envp, MAX_ARG_STRINGS);
 	if ((retval = bprm->envc) < 0)
-		goto out_mm;
-
-	retval = security_bprm_alloc(bprm);
-	if (retval)
 		goto out;
 
 	retval = prepare_binprm(bprm);
@@ -1438,19 +1444,16 @@ int compat_do_execve(char * filename,
 		goto out;
 
 	retval = search_binary_handler(bprm, regs);
-	if (retval >= 0) {
-		/* execve success */
-		security_bprm_free(bprm);
-		acct_update_integrals(current);
-		free_bprm(bprm);
-		return retval;
-	}
+	if (retval < 0)
+		goto out;
 
-out:
-	if (bprm->security)
-		security_bprm_free(bprm);
+	/* execve succeeded */
+	mutex_unlock(&current->cred_exec_mutex);
+	acct_update_integrals(current);
+	free_bprm(bprm);
+	return retval;
 
-out_mm:
+out:
 	if (bprm->mm)
 		mmput(bprm->mm);
 
@@ -1460,7 +1463,10 @@ out_file:
 		fput(bprm->file);
 	}
 
-out_kfree:
+out_unlock:
+	mutex_unlock(&current->cred_exec_mutex);
+
+out_free:
 	free_bprm(bprm);
 
 out_ret: