kunit: test: Make filter strings in executor_test writable

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@google.com>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Rae Moar <rmoar@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

diff --git a/lib/kunit/executor_test.c b/lib/kunit/executor_test.c
index 4084071..b4f6f96 100644 (file)
--- 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);