kasan: use EXPORT_SYMBOL_IF_KUNIT to export symbols

Patch series "kasan: few improvements on kunit tests".

This patch series addresses the issue [1] with KASAN symbols used in the
Kunit test, but exported as EXPORT_SYMBOL_GPL.

Also a small tweak of marking kasan_atomics() as KUNIT_CASE_SLOW to avoid
kunit report that the test should be marked as slow.


This patch (of 2):

Replace EXPORT_SYMBOL_GPL with EXPORT_SYMBOL_IF_KUNIT to mark the symbols
as visible only if CONFIG_KUNIT is enabled.

KASAN Kunit test should import the namespace EXPORTED_FOR_KUNIT_TESTING to
use these marked symbols.

Link: https://lkml.kernel.org/r/[email protected]
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Sabyrzhan Tasbolatov <[email protected]>
Reported-by: Andrey Konovalov <[email protected]>
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=218315
Reviewed-by: Andrey Konovalov <[email protected]>
Cc: Alexander Potapenko <[email protected]>
Cc: Andrey Ryabinin <[email protected]>
Cc: Dmitry Vyukov <[email protected]>
Cc: Marco Elver <[email protected]>
Cc: Vincenzo Frascino <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

Author: novitoll

mm/kasan/hw_tags.c

@@ -8,6 +8,7 @@
 
 #define pr_fmt(fmt) "kasan: " fmt
 
+#include <kunit/visibility.h>
 #include <linux/init.h>
 #include <linux/kasan.h>
 #include <linux/kernel.h>
@@ -394,12 +395,12 @@ void kasan_enable_hw_tags(void)
 
 #if IS_ENABLED(CONFIG_KASAN_KUNIT_TEST)
 
-EXPORT_SYMBOL_GPL(kasan_enable_hw_tags);
+EXPORT_SYMBOL_IF_KUNIT(kasan_enable_hw_tags);
 
-void kasan_force_async_fault(void)
+VISIBLE_IF_KUNIT void kasan_force_async_fault(void)
 {
 	hw_force_async_tag_fault();
 }
-EXPORT_SYMBOL_GPL(kasan_force_async_fault);
+EXPORT_SYMBOL_IF_KUNIT(kasan_force_async_fault);
 
 #endif

mm/kasan/kasan_test_c.c

@@ -33,6 +33,8 @@
 
 #define OOB_TAG_OFF (IS_ENABLED(CONFIG_KASAN_GENERIC) ? 0 : KASAN_GRANULE_SIZE)
 
+MODULE_IMPORT_NS(EXPORTED_FOR_KUNIT_TESTING);
+
 static bool multishot;
 
 /* Fields set based on lines observed in the console. */

mm/kasan/report.c

@@ -10,6 +10,7 @@
  */
 
 #include <kunit/test.h>
+#include <kunit/visibility.h>
 #include <linux/bitops.h>
 #include <linux/ftrace.h>
 #include <linux/init.h>
@@ -134,18 +135,18 @@ static bool report_enabled(void)
 
 #if IS_ENABLED(CONFIG_KASAN_KUNIT_TEST)
 
-bool kasan_save_enable_multi_shot(void)
+VISIBLE_IF_KUNIT bool kasan_save_enable_multi_shot(void)
 {
 	return test_and_set_bit(KASAN_BIT_MULTI_SHOT, &kasan_flags);
 }
-EXPORT_SYMBOL_GPL(kasan_save_enable_multi_shot);
+EXPORT_SYMBOL_IF_KUNIT(kasan_save_enable_multi_shot);
 
-void kasan_restore_multi_shot(bool enabled)
+VISIBLE_IF_KUNIT void kasan_restore_multi_shot(bool enabled)
 {
 	if (!enabled)
 		clear_bit(KASAN_BIT_MULTI_SHOT, &kasan_flags);
 }
-EXPORT_SYMBOL_GPL(kasan_restore_multi_shot);
+EXPORT_SYMBOL_IF_KUNIT(kasan_restore_multi_shot);
 
 #endif
 
@@ -157,17 +158,17 @@ EXPORT_SYMBOL_GPL(kasan_restore_multi_shot);
  */
 static bool kasan_kunit_executing;
 
-void kasan_kunit_test_suite_start(void)
+VISIBLE_IF_KUNIT void kasan_kunit_test_suite_start(void)
 {
 	WRITE_ONCE(kasan_kunit_executing, true);
 }
-EXPORT_SYMBOL_GPL(kasan_kunit_test_suite_start);
+EXPORT_SYMBOL_IF_KUNIT(kasan_kunit_test_suite_start);
 
-void kasan_kunit_test_suite_end(void)
+VISIBLE_IF_KUNIT void kasan_kunit_test_suite_end(void)
 {
 	WRITE_ONCE(kasan_kunit_executing, false);
 }
-EXPORT_SYMBOL_GPL(kasan_kunit_test_suite_end);
+EXPORT_SYMBOL_IF_KUNIT(kasan_kunit_test_suite_end);
 
 static bool kasan_kunit_test_suite_executing(void)
 {