linux-hardening - [PATCH] fortify: Adjust KUnit test for modular build

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Message-Id: <20220913173136.1926909-1-keescook@chromium.org>
Date:   Tue, 13 Sep 2022 10:31:36 -0700
From:   Kees Cook <keescook@...omium.org>
To:     linux-hardening@...r.kernel.org
Cc:     Kees Cook <keescook@...omium.org>,
        Nathan Chancellor <nathan@...nel.org>,
        David Gow <davidgow@...gle.com>, linux-kernel@...r.kernel.org
Subject: [PATCH] fortify: Adjust KUnit test for modular build

A much better "unknown size" string pointer is available directly from
struct test, so use that instead of a global that isn't shared with
modules.

Reported-by: Nathan Chancellor <nathan@...nel.org>
Link: https://lore.kernel.org/lkml/YyCOHOchVuE/E7vS@dev-arch.thelio-3990X
Fixes: 875bfd5276f3 ("fortify: Add KUnit test for FORTIFY_SOURCE internals")
Cc: linux-hardening@...r.kernel.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
Whoops! Thanks Nathan! :) This fixes it for your reproducer.
---
 lib/fortify_kunit.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/lib/fortify_kunit.c b/lib/fortify_kunit.c
index 99bc0ea60d27..409af07f340a 100644
--- a/lib/fortify_kunit.c
+++ b/lib/fortify_kunit.c
@@ -17,7 +17,6 @@
 
 #include <kunit/test.h>
 #include <linux/string.h>
-#include <linux/init.h>
 
 static const char array_of_10[] = "this is 10";
 static const char *ptr_of_11 = "this is 11!";
@@ -31,7 +30,7 @@ static void known_sizes_test(struct kunit *test)
 
 	KUNIT_EXPECT_EQ(test, __compiletime_strlen(array_unknown), SIZE_MAX);
 	/* Externally defined and dynamically sized string pointer: */
-	KUNIT_EXPECT_EQ(test, __compiletime_strlen(saved_command_line), SIZE_MAX);
+	KUNIT_EXPECT_EQ(test, __compiletime_strlen(test->name), SIZE_MAX);
 }
 
 /* This is volatile so the optimizer can't perform DCE below. */
-- 
2.34.1