linux-kernel - Re: [PATCH 1/2] kasan: use EXPORT_SYMBOL_IF

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Message-ID: <CA+fCnZchoBgJp417G8dtNkiYnSY75hBmM=beDrxhJJyuPw=7iQ@mail.gmail.com>
Date: Sat, 2 Nov 2024 00:38:25 +0100
From: Andrey Konovalov <andreyknvl@...il.com>
To: Sabyrzhan Tasbolatov <snovitoll@...il.com>
Cc: ryabinin.a.a@...il.com, elver@...gle.com, arnd@...nel.org, 
	glider@...gle.com, dvyukov@...gle.com, vincenzo.frascino@....com, 
	akpm@...ux-foundation.org, kasan-dev@...glegroups.com, linux-mm@...ck.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] kasan: use EXPORT_SYMBOL_IF_KUNIT to export symbols

On Fri, Nov 1, 2024 at 7:40 PM Sabyrzhan Tasbolatov <snovitoll@...il.com> wrote:
>
> 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.
>
> Reported-by: Andrey Konovalov <andreyknvl@...il.com>
> Closes: https://bugzilla.kernel.org/show_bug.cgi?id=218315
> Signed-off-by: Sabyrzhan Tasbolatov <snovitoll@...il.com>
> ---
>  mm/kasan/hw_tags.c      |  7 ++++---
>  mm/kasan/kasan_test_c.c |  2 ++
>  mm/kasan/report.c       | 17 +++++++++--------
>  3 files changed, 15 insertions(+), 11 deletions(-)
>
> diff --git a/mm/kasan/hw_tags.c b/mm/kasan/hw_tags.c
> index 9958ebc15d38..ccd66c7a4081 100644
> --- a/mm/kasan/hw_tags.c
> +++ b/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
> diff --git a/mm/kasan/kasan_test_c.c b/mm/kasan/kasan_test_c.c
> index a181e4780d9d..3e495c09342e 100644
> --- a/mm/kasan/kasan_test_c.c
> +++ b/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. */
> diff --git a/mm/kasan/report.c b/mm/kasan/report.c
> index b48c768acc84..e5bc4e3ee198 100644
> --- a/mm/kasan/report.c
> +++ b/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) || IS_ENABLED(CONFIG_KASAN_MODULE_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)
>  {
> --
> 2.34.1
>

Reviewed-by: Andrey Konovalov <andreyknvl@...il.com>

Thank you!