From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 70407C433DB for ; Wed, 24 Feb 2021 20:08:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2D63464EC4 for ; Wed, 24 Feb 2021 20:08:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235211AbhBXUH7 (ORCPT ); Wed, 24 Feb 2021 15:07:59 -0500 Received: from mail.kernel.org ([198.145.29.99]:59438 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235158AbhBXUHU (ORCPT ); Wed, 24 Feb 2021 15:07:20 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 5BF8764F1D; Wed, 24 Feb 2021 20:06:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1614197168; bh=3ZNqSqqDplsX1y/ZFBZgkR9nQAYS0PdFf0g51fPa2Kc=; h=Date:From:To:Subject:In-Reply-To:From; b=flb6h3kYcOBSsBOreY0DfbP6KXrRayMoN/qcQQNFeD5klvNxOoNF/g9rmTE53jxhB ScawZ4bxs8zRgFoNFGZzG12b6qaH8rLfeLRcGfr1MobQanxn56ZrrUeFtqT10gf4co sQBGL33aXU3NI7bKD3lE6lcJ+pGOAAxfgjPk0yLQ= Date: Wed, 24 Feb 2021 12:06:06 -0800 From: Andrew Morton To: akpm@linux-foundation.org, andreyknvl@google.com, arnd@arndb.de, aryabinin@virtuozzo.com, dvyukov@google.com, glider@google.com, linux-mm@kvack.org, mm-commits@vger.kernel.org, natechancellor@gmail.com, torvalds@linux-foundation.org, walter-zh.wu@mediatek.com Subject: [patch 101/173] kasan: remove redundant config option Message-ID: <20210224200606.fil4kbsxV%akpm@linux-foundation.org> In-Reply-To: <20210224115824.1e289a6895087f10c41dd8d6@linux-foundation.org> User-Agent: s-nail v14.8.16 Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org From: Walter Wu Subject: kasan: remove redundant config option CONFIG_KASAN_STACK and CONFIG_KASAN_STACK_ENABLE both enable KASAN stack instrumentation, but we should only need one config, so that we remove CONFIG_KASAN_STACK_ENABLE and make CONFIG_KASAN_STACK workable. see [1]. When enable KASAN stack instrumentation, then for gcc we could do no prompt and default value y, and for clang prompt and default value n. [1]: https://bugzilla.kernel.org/show_bug.cgi?id=210221 [walter-zh.wu@mediatek.com: fix remaining the pre-processor syntax] Link: https://lkml.kernel.org/r/20210108040940.1138-1-walter-zh.wu@mediatek.com Link: https://lkml.kernel.org/r/20210107075315.3482-1-walter-zh.wu@mediatek.com Signed-off-by: Walter Wu Suggested-by: Dmitry Vyukov Reviewed-by: Nathan Chancellor Acked-by: Arnd Bergmann Reviewed-by: Andrey Konovalov Cc: Andrey Ryabinin Cc: Dmitry Vyukov Cc: Alexander Potapenko Signed-off-by: Andrew Morton --- arch/arm64/kernel/sleep.S | 2 +- arch/x86/kernel/acpi/wakeup_64.S | 2 +- include/linux/kasan.h | 2 +- lib/Kconfig.kasan | 8 ++------ mm/kasan/common.c | 2 +- mm/kasan/kasan.h | 2 +- mm/kasan/report_generic.c | 2 +- scripts/Makefile.kasan | 10 ++++++++-- 8 files changed, 16 insertions(+), 14 deletions(-) --- a/arch/arm64/kernel/sleep.S~kasan-remove-redundant-config-option +++ a/arch/arm64/kernel/sleep.S @@ -134,7 +134,7 @@ SYM_FUNC_START(_cpu_resume) */ bl cpu_do_resume -#if defined(CONFIG_KASAN) && CONFIG_KASAN_STACK +#if defined(CONFIG_KASAN) && defined(CONFIG_KASAN_STACK) mov x0, sp bl kasan_unpoison_task_stack_below #endif --- a/arch/x86/kernel/acpi/wakeup_64.S~kasan-remove-redundant-config-option +++ a/arch/x86/kernel/acpi/wakeup_64.S @@ -115,7 +115,7 @@ SYM_FUNC_START(do_suspend_lowlevel) movq pt_regs_r14(%rax), %r14 movq pt_regs_r15(%rax), %r15 -#if defined(CONFIG_KASAN) && CONFIG_KASAN_STACK +#if defined(CONFIG_KASAN) && defined(CONFIG_KASAN_STACK) /* * The suspend path may have poisoned some areas deeper in the stack, * which we now need to unpoison. --- a/include/linux/kasan.h~kasan-remove-redundant-config-option +++ a/include/linux/kasan.h @@ -321,7 +321,7 @@ static inline bool kasan_check_byte(cons #endif /* CONFIG_KASAN */ -#if defined(CONFIG_KASAN) && CONFIG_KASAN_STACK +#if defined(CONFIG_KASAN) && defined(CONFIG_KASAN_STACK) void kasan_unpoison_task_stack(struct task_struct *task); #else static inline void kasan_unpoison_task_stack(struct task_struct *task) {} --- a/lib/Kconfig.kasan~kasan-remove-redundant-config-option +++ a/lib/Kconfig.kasan @@ -138,9 +138,10 @@ config KASAN_INLINE endchoice -config KASAN_STACK_ENABLE +config KASAN_STACK bool "Enable stack instrumentation (unsafe)" if CC_IS_CLANG && !COMPILE_TEST depends on KASAN_GENERIC || KASAN_SW_TAGS + default y if CC_IS_GCC help The LLVM stack address sanitizer has a know problem that causes excessive stack usage in a lot of functions, see @@ -154,11 +155,6 @@ config KASAN_STACK_ENABLE CONFIG_COMPILE_TEST. On gcc it is assumed to always be safe to use and enabled by default. -config KASAN_STACK - int - default 1 if KASAN_STACK_ENABLE || CC_IS_GCC - default 0 - config KASAN_SW_TAGS_IDENTIFY bool "Enable memory corruption identification" depends on KASAN_SW_TAGS --- a/mm/kasan/common.c~kasan-remove-redundant-config-option +++ a/mm/kasan/common.c @@ -63,7 +63,7 @@ void __kasan_unpoison_range(const void * kasan_unpoison(address, size); } -#if CONFIG_KASAN_STACK +#ifdef CONFIG_KASAN_STACK /* Unpoison the entire stack for a task. */ void kasan_unpoison_task_stack(struct task_struct *task) { --- a/mm/kasan/kasan.h~kasan-remove-redundant-config-option +++ a/mm/kasan/kasan.h @@ -230,7 +230,7 @@ void *kasan_find_first_bad_addr(void *ad const char *kasan_get_bug_type(struct kasan_access_info *info); void kasan_metadata_fetch_row(char *buffer, void *row); -#if defined(CONFIG_KASAN_GENERIC) && CONFIG_KASAN_STACK +#if defined(CONFIG_KASAN_GENERIC) && defined(CONFIG_KASAN_STACK) void kasan_print_address_stack_frame(const void *addr); #else static inline void kasan_print_address_stack_frame(const void *addr) { } --- a/mm/kasan/report_generic.c~kasan-remove-redundant-config-option +++ a/mm/kasan/report_generic.c @@ -128,7 +128,7 @@ void kasan_metadata_fetch_row(char *buff memcpy(buffer, kasan_mem_to_shadow(row), META_BYTES_PER_ROW); } -#if CONFIG_KASAN_STACK +#ifdef CONFIG_KASAN_STACK static bool __must_check tokenize_frame_descr(const char **frame_descr, char *token, size_t max_tok_len, unsigned long *value) --- a/scripts/Makefile.kasan~kasan-remove-redundant-config-option +++ a/scripts/Makefile.kasan @@ -2,6 +2,12 @@ CFLAGS_KASAN_NOSANITIZE := -fno-builtin KASAN_SHADOW_OFFSET ?= $(CONFIG_KASAN_SHADOW_OFFSET) +ifdef CONFIG_KASAN_STACK + stack_enable := 1 +else + stack_enable := 0 +endif + ifdef CONFIG_KASAN_GENERIC ifdef CONFIG_KASAN_INLINE @@ -27,7 +33,7 @@ else CFLAGS_KASAN := $(CFLAGS_KASAN_SHADOW) \ $(call cc-param,asan-globals=1) \ $(call cc-param,asan-instrumentation-with-call-threshold=$(call_threshold)) \ - $(call cc-param,asan-stack=$(CONFIG_KASAN_STACK)) \ + $(call cc-param,asan-stack=$(stack_enable)) \ $(call cc-param,asan-instrument-allocas=1) endif @@ -42,7 +48,7 @@ else endif CFLAGS_KASAN := -fsanitize=kernel-hwaddress \ - -mllvm -hwasan-instrument-stack=$(CONFIG_KASAN_STACK) \ + -mllvm -hwasan-instrument-stack=$(stack_enable) \ -mllvm -hwasan-use-short-granules=0 \ $(instrumentation_flags) _