linux-kernel - Re: [PATCH] kunit: test: Make filter strings in executor

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Date:   Tue, 29 Aug 2023 18:44:12 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     David Gow <davidgow@...gle.com>
Cc:     Shuah Khan <skhan@...uxfoundation.org>,
        Rae Moar <rmoar@...gle.com>,
        Brendan Higgins <brendan.higgins@...ux.dev>,
        kunit-dev@...glegroups.com, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kunit: test: Make filter strings in executor_test
 writable

On Wed, Aug 30, 2023 at 08:21:15AM +0800, David Gow wrote:
> KUnit's attribute filtering feature needs the filter strings passed in
> to be writable, as it modifies them in-place during parsing. This works
> for the filters passed on the kernel command line, but the string
> literals used in the executor tests are at least theoretically read-only
> (though they work on x86_64 for some reason). s390 wasn't fooled, and
> crashed when these tests were run.
> 
> Use a 'char[]' instead, (and make an explicit variable for the current
> filter in parse_filter_attr_test), which will store the string in a
> writable segment.
> 
> Fixes: 76066f93f1df ("kunit: add tests for filtering attributes")
> Closes: https://lore.kernel.org/linux-kselftest/55950256-c00a-4d21-a2c0-cf9f0e5b8a9a@roeck-us.net/
> Signed-off-by: David Gow <davidgow@...gle.com>

Tested-by: Guenter Roeck <linux@...ck-us.net>

Guenter

> ---
>  lib/kunit/executor_test.c | 13 ++++++++-----
>  1 file changed, 8 insertions(+), 5 deletions(-)
> 
> diff --git a/lib/kunit/executor_test.c b/lib/kunit/executor_test.c
> index 4084071d0eb5..b4f6f96b2844 100644
> --- a/lib/kunit/executor_test.c
> +++ b/lib/kunit/executor_test.c
> @@ -119,7 +119,7 @@ static void parse_filter_attr_test(struct kunit *test)
>  {
>  	int j, filter_count;
>  	struct kunit_attr_filter *parsed_filters;
> -	char *filters = "speed>slow, module!=example";
> +	char filters[] = "speed>slow, module!=example", *filter = filters;
>  	int err = 0;
>  
>  	filter_count = kunit_get_filter_count(filters);
> @@ -128,7 +128,7 @@ static void parse_filter_attr_test(struct kunit *test)
>  	parsed_filters = kunit_kcalloc(test, filter_count, sizeof(*parsed_filters),
>  			GFP_KERNEL);
>  	for (j = 0; j < filter_count; j++) {
> -		parsed_filters[j] = kunit_next_attr_filter(&filters, &err);
> +		parsed_filters[j] = kunit_next_attr_filter(&filter, &err);
>  		KUNIT_ASSERT_EQ_MSG(test, err, 0, "failed to parse filter '%s'", filters[j]);
>  	}
>  
> @@ -154,6 +154,7 @@ static void filter_attr_test(struct kunit *test)
>  		.start = subsuite, .end = &subsuite[2],
>  	};
>  	struct kunit_suite_set got;
> +	char filter[] = "speed>slow";
>  	int err = 0;
>  
>  	subsuite[0] = alloc_fake_suite(test, "normal_suite", dummy_attr_test_cases);
> @@ -168,7 +169,7 @@ static void filter_attr_test(struct kunit *test)
>  	 * attribute is unset and thus, the filtering is based on the parent attribute
>  	 * of slow.
>  	 */
> -	got = kunit_filter_suites(&suite_set, NULL, "speed>slow", NULL, &err);
> +	got = kunit_filter_suites(&suite_set, NULL, filter, NULL, &err);
>  	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, got.start);
>  	KUNIT_ASSERT_EQ(test, err, 0);
>  	kfree_at_end(test, got.start);
> @@ -191,12 +192,13 @@ static void filter_attr_empty_test(struct kunit *test)
>  		.start = subsuite, .end = &subsuite[2],
>  	};
>  	struct kunit_suite_set got;
> +	char filter[] = "module!=dummy";
>  	int err = 0;
>  
>  	subsuite[0] = alloc_fake_suite(test, "suite1", dummy_attr_test_cases);
>  	subsuite[1] = alloc_fake_suite(test, "suite2", dummy_attr_test_cases);
>  
> -	got = kunit_filter_suites(&suite_set, NULL, "module!=dummy", NULL, &err);
> +	got = kunit_filter_suites(&suite_set, NULL, filter, NULL, &err);
>  	KUNIT_ASSERT_EQ(test, err, 0);
>  	kfree_at_end(test, got.start); /* just in case */
>  
> @@ -211,12 +213,13 @@ static void filter_attr_skip_test(struct kunit *test)
>  		.start = subsuite, .end = &subsuite[1],
>  	};
>  	struct kunit_suite_set got;
> +	char filter[] = "speed>slow";
>  	int err = 0;
>  
>  	subsuite[0] = alloc_fake_suite(test, "suite", dummy_attr_test_cases);
>  
>  	/* Want: suite(slow, normal), NULL -> suite(slow with SKIP, normal), NULL */
> -	got = kunit_filter_suites(&suite_set, NULL, "speed>slow", "skip", &err);
> +	got = kunit_filter_suites(&suite_set, NULL, filter, "skip", &err);
>  	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, got.start);
>  	KUNIT_ASSERT_EQ(test, err, 0);
>  	kfree_at_end(test, got.start);
> -- 
> 2.42.0.283.g2d96d420d3-goog
>