# --- T2-COPYRIGHT-NOTE-BEGIN ---
# T2 SDE: package/*/linux/hotfix-exec.patch
# Copyright (C) 2022 The T2 SDE Project
# 
# This Copyright note is generated by scripts/Create-CopyPatch,
# more information can be found in the files COPYING and README.
# 
# This patch file is dual-licensed. It is available under the license the
# patched project is licensed under, as long as it is an OpenSource license
# as defined at http://www.opensource.org/ (e.g. BSD, X11) or under the terms
# of the GNU General Public License version 2 as used by the T2 SDE.
# --- T2-COPYRIGHT-NOTE-END ---

Prevert PwnKit class of vulnerabilities by not allowing 0 argv, like OpenBSD.

https://bugzilla.kernel.org/show_bug.cgi?id=8408

--- linux-5.15/fs/exec.c.vanilla	2022-01-27 17:12:37.390020117 +0100
+++ linux-5.15/fs/exec.c	2022-01-27 17:12:38.727020064 +0100
@@ -1897,6 +1897,10 @@
 	retval = count(argv, MAX_ARG_STRINGS);
 	if (retval < 0)
 		goto out_free;
+	else if (retval == 0) {
+		retval = -EINVAL;
+		goto out_free;
+	}
 	bprm->argc = retval;
 
 	retval = count(envp, MAX_ARG_STRINGS);