exec: Rename the flag called_exec_mmap point_of_no_return

Update the comments and make the code easier to understand by
renaming this flag.
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Greg Ungerer <gerg@linux-m68k.org>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>

fs/exec.c

@@ -1326,12 +1326,12 @@ int flush_old_exec(struct linux_binprm * bprm)
 		goto out;
 
 	/*
-	 * After setting bprm->called_exec_mmap (to mark that current is
-	 * using the prepared mm now), we have nothing left of the original
-	 * process. If anything from here on returns an error, the check
-	 * in search_binary_handler() will SEGV current.
+	 * With the new mm installed it is completely impossible to
+	 * fail and return to the original process.  If anything from
+	 * here on returns an error, the check in
+	 * search_binary_handler() will SEGV current.
 	 */
-	bprm->called_exec_mmap = 1;
+	bprm->point_of_no_return = true;
 	bprm->mm = NULL;
 
 #ifdef CONFIG_POSIX_TIMERS
@@ -1720,7 +1720,7 @@ int search_binary_handler(struct linux_binprm *bprm)
 
 		read_lock(&binfmt_lock);
 		put_binfmt(fmt);
-		if (retval < 0 && bprm->called_exec_mmap) {
+		if (retval < 0 && bprm->point_of_no_return) {
 			/* we got to flush_old_exec() and failed after it */
 			read_unlock(&binfmt_lock);
 			force_sigsegv(SIGSEGV);

include/linux/binfmts.h

@@ -46,10 +46,10 @@ struct linux_binprm {
 		 */
 		secureexec:1,
 		/*
-		 * Set by flush_old_exec, when exec_mmap has been called.
-		 * This is past the point of no return.
+		 * Set when errors can no longer be returned to the
+		 * original userspace.
 		 */
-		called_exec_mmap:1;
+		point_of_no_return:1;
 #ifdef __alpha__
 	unsigned int taso:1;
 #endif