patches/old/module-panic-taint-the-kernel-when-selftest-modules-load.patch

From: David Gow <davidgow@google.com>
Subject: module: panic: taint the kernel when selftest modules load
Date: Fri, 8 Jul 2022 12:48:45 +0800

Taint the kernel with TAINT_TEST whenever a test module loads, by adding a
new "TEST" module property, and setting it for all modules in the
tools/testing directory.  This property can also be set manually, for
tests which live outside the tools/testing directory with:
MODULE_INFO(test, "Y");

Link: https://lkml.kernel.org/r/20220708044847.531566-2-davidgow@google.com
Signed-off-by: David Gow <davidgow@google.com>
Reviewed-by: Luis Chamberlain <mcgrof@kernel.org>
Reviewed-by: Aaron Tomlin <atomlin@redhat.com>
Acked-by: Brendan Higgins <brendanhiggins@google.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Daniel Latypov <dlatypov@google.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Guilherme G. Piccoli <gpiccoli@igalia.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: John Ogness <john.ogness@linutronix.de>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Kees Cook <keescook@chromium.org>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Michal Marek <michal.lkml@markovi.net>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Sebastian Reichel <sre@kernel.org>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 kernel/module/main.c  |    7 +++++++
 scripts/mod/modpost.c |    3 +++
 2 files changed, 10 insertions(+)

--- a/kernel/module/main.c~module-panic-taint-the-kernel-when-selftest-modules-load
+++ a/kernel/module/main.c
@@ -1988,6 +1988,13 @@ static int check_modinfo(struct module *
 	/* Set up license info based on the info section */
 	set_license(mod, get_modinfo(info, "license"));
 
+	if (get_modinfo(info, "test")) {
+		if (!test_taint(TAINT_TEST))
+			pr_warn("%s: loading test module taints kernel.\n",
+				mod->name);
+		add_taint_module(mod, TAINT_TEST, LOCKDEP_STILL_OK);
+	}
+
 	return 0;
 }
 
--- a/scripts/mod/modpost.c~module-panic-taint-the-kernel-when-selftest-modules-load
+++ a/scripts/mod/modpost.c
@@ -2191,6 +2191,9 @@ static void add_header(struct buffer *b,
 
 	if (strstarts(mod->name, "drivers/staging"))
 		buf_printf(b, "\nMODULE_INFO(staging, \"Y\");\n");
+
+	if (strstarts(mod->name, "tools/testing"))
+		buf_printf(b, "\nMODULE_INFO(test, \"Y\");\n");
 }
 
 static void add_exported_symbols(struct buffer *buf, struct module *mod)
_