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authorAndrey Konovalov <andreyknvl@google.com>2022-09-27 19:09:09 +0200
committerAndrew Morton <akpm@linux-foundation.org>2022-11-08 17:37:14 -0800
commit7ce0ea19d50e4e97a8da69f616ffa8afbb532a93 (patch)
tree5b75baeb3bd12ee9a282004a779f372c6325485d /mm/kasan
parenta5454f95246aa1d3527ef5e128cd3a10bc8371de (diff)
kasan: switch kunit tests to console tracepoints
Switch KUnit-compatible KASAN tests from using per-task KUnit resources to console tracepoints. This allows for two things: 1. Migrating tests that trigger a KASAN report in the context of a task other than current to KUnit framework. This is implemented in the patches that follow. 2. Parsing and matching the contents of KASAN reports. This is not yet implemented. Link: https://lkml.kernel.org/r/9345acdd11e953b207b0ed4724ff780e63afeb36.1664298455.git.andreyknvl@google.com Signed-off-by: Andrey Konovalov <andreyknvl@google.com> Reviewed-by: Marco Elver <elver@google.com> Cc: Alexander Potapenko <glider@google.com> Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com> Cc: Dmitry Vyukov <dvyukov@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/kasan')
-rw-r--r--mm/kasan/kasan.h8
-rw-r--r--mm/kasan/kasan_test.c85
-rw-r--r--mm/kasan/report.c31
3 files changed, 62 insertions, 62 deletions
diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h
index abbcc1b0eec5..a84491bc4867 100644
--- a/mm/kasan/kasan.h
+++ b/mm/kasan/kasan.h
@@ -261,14 +261,6 @@ struct kasan_stack_ring {
#endif /* CONFIG_KASAN_SW_TAGS || CONFIG_KASAN_HW_TAGS */
-#if IS_ENABLED(CONFIG_KASAN_KUNIT_TEST)
-/* Used in KUnit-compatible KASAN tests. */
-struct kunit_kasan_status {
- bool report_found;
- bool sync_fault;
-};
-#endif
-
#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
static inline const void *kasan_shadow_to_mem(const void *shadow_addr)
diff --git a/mm/kasan/kasan_test.c b/mm/kasan/kasan_test.c
index 0d59098f0876..0ff20bfa3376 100644
--- a/mm/kasan/kasan_test.c
+++ b/mm/kasan/kasan_test.c
@@ -5,8 +5,12 @@
* Author: Andrey Ryabinin <a.ryabinin@samsung.com>
*/
+#define pr_fmt(fmt) "kasan_test: " fmt
+
+#include <kunit/test.h>
#include <linux/bitops.h>
#include <linux/delay.h>
+#include <linux/io.h>
#include <linux/kasan.h>
#include <linux/kernel.h>
#include <linux/mm.h>
@@ -14,21 +18,28 @@
#include <linux/module.h>
#include <linux/printk.h>
#include <linux/random.h>
+#include <linux/set_memory.h>
#include <linux/slab.h>
#include <linux/string.h>
+#include <linux/tracepoint.h>
#include <linux/uaccess.h>
-#include <linux/io.h>
#include <linux/vmalloc.h>
-#include <linux/set_memory.h>
+#include <trace/events/printk.h>
#include <asm/page.h>
-#include <kunit/test.h>
-
#include "kasan.h"
#define OOB_TAG_OFF (IS_ENABLED(CONFIG_KASAN_GENERIC) ? 0 : KASAN_GRANULE_SIZE)
+static bool multishot;
+
+/* Fields set based on lines observed in the console. */
+static struct {
+ bool report_found;
+ bool async_fault;
+} test_status;
+
/*
* Some tests use these global variables to store return values from function
* calls that could otherwise be eliminated by the compiler as dead code.
@@ -36,35 +47,61 @@
void *kasan_ptr_result;
int kasan_int_result;
-static struct kunit_resource resource;
-static struct kunit_kasan_status test_status;
-static bool multishot;
+/* Probe for console output: obtains test_status lines of interest. */
+static void probe_console(void *ignore, const char *buf, size_t len)
+{
+ if (strnstr(buf, "BUG: KASAN: ", len))
+ WRITE_ONCE(test_status.report_found, true);
+ else if (strnstr(buf, "Asynchronous fault: ", len))
+ WRITE_ONCE(test_status.async_fault, true);
+}
-/*
- * Temporarily enable multi-shot mode. Otherwise, KASAN would only report the
- * first detected bug and panic the kernel if panic_on_warn is enabled. For
- * hardware tag-based KASAN also allow tag checking to be reenabled for each
- * test, see the comment for KUNIT_EXPECT_KASAN_FAIL().
- */
-static int kasan_test_init(struct kunit *test)
+static void register_tracepoints(struct tracepoint *tp, void *ignore)
+{
+ check_trace_callback_type_console(probe_console);
+ if (!strcmp(tp->name, "console"))
+ WARN_ON(tracepoint_probe_register(tp, probe_console, NULL));
+}
+
+static void unregister_tracepoints(struct tracepoint *tp, void *ignore)
+{
+ if (!strcmp(tp->name, "console"))
+ tracepoint_probe_unregister(tp, probe_console, NULL);
+}
+
+static int kasan_suite_init(struct kunit_suite *suite)
{
if (!kasan_enabled()) {
- kunit_err(test, "can't run KASAN tests with KASAN disabled");
+ pr_err("Can't run KASAN tests with KASAN disabled");
return -1;
}
+ /*
+ * Temporarily enable multi-shot mode. Otherwise, KASAN would only
+ * report the first detected bug and panic the kernel if panic_on_warn
+ * is enabled.
+ */
multishot = kasan_save_enable_multi_shot();
- test_status.report_found = false;
- test_status.sync_fault = false;
- kunit_add_named_resource(test, NULL, NULL, &resource,
- "kasan_status", &test_status);
+
+ /*
+ * Because we want to be able to build the test as a module, we need to
+ * iterate through all known tracepoints, since the static registration
+ * won't work here.
+ */
+ for_each_kernel_tracepoint(register_tracepoints, NULL);
return 0;
}
-static void kasan_test_exit(struct kunit *test)
+static void kasan_suite_exit(struct kunit_suite *suite)
{
kasan_restore_multi_shot(multishot);
- KUNIT_EXPECT_FALSE(test, test_status.report_found);
+ for_each_kernel_tracepoint(unregister_tracepoints, NULL);
+ tracepoint_synchronize_unregister();
+}
+
+static void kasan_test_exit(struct kunit *test)
+{
+ KUNIT_EXPECT_FALSE(test, READ_ONCE(test_status.report_found));
}
/**
@@ -106,11 +143,12 @@ static void kasan_test_exit(struct kunit *test)
if (IS_ENABLED(CONFIG_KASAN_HW_TAGS) && \
kasan_sync_fault_possible()) { \
if (READ_ONCE(test_status.report_found) && \
- READ_ONCE(test_status.sync_fault)) \
+ !READ_ONCE(test_status.async_fault)) \
kasan_enable_tagging(); \
migrate_enable(); \
} \
WRITE_ONCE(test_status.report_found, false); \
+ WRITE_ONCE(test_status.async_fault, false); \
} while (0)
#define KASAN_TEST_NEEDS_CONFIG_ON(test, config) do { \
@@ -1447,9 +1485,10 @@ static struct kunit_case kasan_kunit_test_cases[] = {
static struct kunit_suite kasan_kunit_test_suite = {
.name = "kasan",
- .init = kasan_test_init,
.test_cases = kasan_kunit_test_cases,
.exit = kasan_test_exit,
+ .suite_init = kasan_suite_init,
+ .suite_exit = kasan_suite_exit,
};
kunit_test_suite(kasan_kunit_test_suite);
diff --git a/mm/kasan/report.c b/mm/kasan/report.c
index df3602062bfd..31355851a5ec 100644
--- a/mm/kasan/report.c
+++ b/mm/kasan/report.c
@@ -30,8 +30,6 @@
#include <asm/sections.h>
-#include <kunit/test.h>
-
#include "kasan.h"
#include "../slab.h"
@@ -114,41 +112,12 @@ EXPORT_SYMBOL_GPL(kasan_restore_multi_shot);
#endif
-#if IS_ENABLED(CONFIG_KASAN_KUNIT_TEST)
-static void update_kunit_status(bool sync)
-{
- struct kunit *test;
- struct kunit_resource *resource;
- struct kunit_kasan_status *status;
-
- test = current->kunit_test;
- if (!test)
- return;
-
- resource = kunit_find_named_resource(test, "kasan_status");
- if (!resource) {
- kunit_set_failure(test);
- return;
- }
-
- status = (struct kunit_kasan_status *)resource->data;
- WRITE_ONCE(status->report_found, true);
- WRITE_ONCE(status->sync_fault, sync);
-
- kunit_put_resource(resource);
-}
-#else
-static void update_kunit_status(bool sync) { }
-#endif
-
static DEFINE_SPINLOCK(report_lock);
static void start_report(unsigned long *flags, bool sync)
{
/* Respect the /proc/sys/kernel/traceoff_on_warning interface. */
disable_trace_on_warning();
- /* Update status of the currently running KASAN test. */
- update_kunit_status(sync);
/* Do not allow LOCKDEP mangling KASAN reports. */
lockdep_off();
/* Make sure we don't end up in loop. */