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Subject[RFC PATCH v2 2/3] KUnit: KASAN Integration
From
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(-)

diff --git a/include/kunit/test.h b/include/kunit/test.h
index 70ee581b19cd..2ab265f4f76c 100644
--- a/include/kunit/test.h
+++ b/include/kunit/test.h
@@ -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.
diff --git a/lib/kunit/test.c b/lib/kunit/test.c
index 86a4d9ca0a45..3f927ef45827 100644
--- a/lib/kunit/test.c
+++ b/lib/kunit/test.c
@@ -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);

diff --git a/lib/test_kasan.c b/lib/test_kasan.c
index 3872d250ed2c..cf73c6bee81b 100644
--- a/lib/test_kasan.c
+++ b/lib/test_kasan.c
@@ -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.
diff --git a/mm/kasan/report.c b/mm/kasan/report.c
index 5ef9f24f566b..ef3d0f54097e 100644
--- a/mm/kasan/report.c
+++ b/mm/kasan/report.c
@@ -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;
--
2.25.1.696.g5e7596f4ac-goog
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