@@ -19,9 +19,19 @@
struct kunit_resource;
+#ifdef CONFIG_KASAN
+/* kasan_data struct is used in KUnit tests for KASAN expected failures */
+struct kunit_kasan_expectation {
+ bool report_expected;
+ bool report_found;
+};
+#endif /* CONFIG_KASAN */
+
typedef int (*kunit_resource_init_t)(struct kunit_resource *, void *);
typedef void (*kunit_resource_free_t)(struct kunit_resource *);
+void kunit_set_failure(struct kunit *test);
+
/**
* struct kunit_resource - represents a *test managed resource*
* @data: for the user to store arbitrary data.
@@ -10,11 +10,12 @@
#include <linux/kernel.h>
#include <linux/kref.h>
#include <linux/sched/debug.h>
+#include <linux/sched.h>
#include "string-stream.h"
#include "try-catch-impl.h"
-static void kunit_set_failure(struct kunit *test)
+void kunit_set_failure(struct kunit *test)
{
WRITE_ONCE(test->success, false);
}
@@ -237,6 +238,10 @@ static void kunit_try_run_case(void *data)
struct kunit_suite *suite = ctx->suite;
struct kunit_case *test_case = ctx->test_case;
+#if (IS_ENABLED(CONFIG_KASAN) && IS_BUILTIN(CONFIG_KUNIT))
+ current->kunit_test = test;
+#endif /* IS_ENABLED(CONFIG_KASAN) && IS_BUILTIN(CONFIG_KUNIT) */
+
/*
* kunit_run_case_internal may encounter a fatal error; if it does,
* abort will be called, this thread will exit, and finally the parent
@@ -590,6 +595,9 @@ void kunit_cleanup(struct kunit *test)
spin_unlock(&test->lock);
kunit_remove_resource(test, res);
}
+#if (IS_ENABLED(CONFIG_KASAN) && IS_BUILTIN(CONFIG_KUNIT))
+ current->kunit_test = NULL;
+#endif /* IS_ENABLED(CONFIG_KASAN) && IS_BUILTIN(CONFIG_KUNIT)*/
}
EXPORT_SYMBOL_GPL(kunit_cleanup);
@@ -23,6 +23,43 @@
#include <asm/page.h>
+#include <kunit/test.h>
+
+struct kunit_resource resource;
+struct kunit_kasan_expectation fail_data;
+
+#define KUNIT_SET_KASAN_DATA(test) do { \
+ fail_data.report_expected = true; \
+ fail_data.report_found = false; \
+ kunit_add_named_resource(test, \
+ NULL, \
+ NULL, \
+ &resource, \
+ "kasan_data", &fail_data); \
+} while (0)
+
+#define KUNIT_DO_EXPECT_KASAN_FAIL(test, condition) do { \
+ struct kunit_resource *resource; \
+ struct kunit_kasan_expectation *kasan_data; \
+ condition; \
+ resource = kunit_find_named_resource(test, "kasan_data"); \
+ kasan_data = resource->data; \
+ KUNIT_EXPECT_EQ(test, \
+ kasan_data->report_expected, \
+ kasan_data->report_found); \
+ kunit_put_resource(resource); \
+} while (0)
+
+/**
+ * KUNIT_EXPECT_KASAN_FAIL() - Causes a test failure when the expression does
+ * not cause a KASAN error.
+ *
+ */
+#define KUNIT_EXPECT_KASAN_FAIL(test, condition) do { \
+ KUNIT_SET_KASAN_DATA(test); \
+ KUNIT_DO_EXPECT_KASAN_FAIL(test, condition); \
+} while (0)
+
/*
* Note: test functions are marked noinline so that their names appear in
* reports.
@@ -32,6 +32,8 @@
#include <asm/sections.h>
+#include <kunit/test.h>
+
#include "kasan.h"
#include "../slab.h"
@@ -455,12 +457,38 @@ static bool report_enabled(void)
return !test_and_set_bit(KASAN_BIT_REPORTED, &kasan_flags);
}
+#if IS_BUILTIN(CONFIG_KUNIT)
+void kasan_update_kunit_status(struct kunit *cur_test)
+{
+ struct kunit_resource *resource;
+ struct kunit_kasan_expectation *kasan_data;
+
+ if (kunit_find_named_resource(cur_test, "kasan_data")) {
+ resource = kunit_find_named_resource(cur_test, "kasan_data");
+ kasan_data = resource->data;
+ kasan_data->report_found = true;
+
+ if (!kasan_data->report_expected)
+ kunit_set_failure(current->kunit_test);
+ else
+ return;
+ } else
+ kunit_set_failure(current->kunit_test);
+}
+#endif /* IS_BUILTIN(CONFIG_KUNIT) */
+
void kasan_report_invalid_free(void *object, unsigned long ip)
{
unsigned long flags;
u8 tag = get_tag(object);
object = reset_tag(object);
+
+#if IS_BUILTIN(CONFIG_KUNIT)
+ if (current->kunit_test)
+ kasan_update_kunit_status(current->kunit_test);
+#endif /* IS_BUILTIN(CONFIG_KUNIT) */
+
start_report(&flags);
pr_err("BUG: KASAN: double-free or invalid-free in %pS\n", (void *)ip);
print_tags(tag, object);
@@ -481,6 +509,11 @@ void __kasan_report(unsigned long addr, size_t size, bool is_write, unsigned lon
if (likely(!report_enabled()))
return;
+#if IS_BUILTIN(CONFIG_KUNIT)
+ if (current->kunit_test)
+ kasan_update_kunit_status(current->kunit_test);
+#endif /* IS_BUILTIN(CONFIG_KUNIT) */
+
disable_trace_on_warning();
tagged_addr = (void *)addr;
Integrate KASAN into KUnit testing framework. - Fail tests when KASAN reports an error that is not expected - Use KUNIT_EXPECT_KASAN_FAIL to expect a KASAN error in KASAN tests - Expected KASAN reports pass tests and are still printed when run without kunit_tool (kunit_tool still bypasses the report due to the test passing) - KUnit struct in current task used to keep track of the current test from KASAN code Make use of "[RFC PATCH kunit-next 1/2] kunit: generalize kunit_resource API beyond allocated resources" and "[RFC PATCH kunit-next 2/2] kunit: add support for named resources" from Alan Maguire [1] - A named resource is added to a test when a KASAN report is expected - This resource contains a struct for kasan_data containing booleans representing if a KASAN report is expected and if a KASAN report is found [1] (https://lore.kernel.org/linux-kselftest/1583251361-12748-1-git-send-email-alan.maguire@oracle.com/T/#t) Signed-off-by: Patricia Alfonso <trishalfonso@google.com> --- include/kunit/test.h | 10 ++++++++++ lib/kunit/test.c | 10 +++++++++- lib/test_kasan.c | 37 +++++++++++++++++++++++++++++++++++++ mm/kasan/report.c | 33 +++++++++++++++++++++++++++++++++ 4 files changed, 89 insertions(+), 1 deletion(-)