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s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=yqDvbJRB7ghhYUJnBffV6Wdevt15gkjdAFpaNJ5xwpI=; b=JCXLcDEbWTBNaANeN95ox3nWB/BMrc8kC1LUQzHK4WL8ANGrUesxW0QGbqQHaiOtF/ 9Mx/aSXReD6CyfmVOMGTatIJrKhsKTs3Xpjp31gOfk6KcLSjkk6jcqwoch9ueJCi28s2 TE1GpSk8x3rMIiyMopEoMU/KADWg+jQZ1zxEE2MjnGL3lxXaHnjS+Jh+dbM6gKwBQLUX 3i7d7x1cioOoIOkIa52rAvRy1Kb1giWMIuJndBVJcyV9UIf29wm+h1kL6rWj055IQlO/ 90v+9dNi18pIhVihTzIO6tsfKg+L35o1cGKRBQBaihkKTfIlP+ko9l1hEHhAI1FuUAAX i/Aw== X-Gm-Message-State: AOAM530uijiNhl2TaQiAdCxuTT754GXu++Z4ZYeO6KfpRk0TUD+6BXK4 2vQtvCq1QiMiaGwe+trDVPjZC52T8RSV8rQR X-Google-Smtp-Source: ABdhPJyJZIfoQU8kIAVBaHLf+CE/8nKps8LgSd0/B5y0ypQpapc4GyhKksQd0R944+AQ9wkt5psrYlbDykyLb/2S X-Received: by 2002:a17:906:c7c8:: with SMTP id dc8mr3324691ejb.285.1597426051207; Fri, 14 Aug 2020 10:27:31 -0700 (PDT) Date: Fri, 14 Aug 2020 19:26:45 +0200 In-Reply-To: Message-Id: <272b331db9919432cd6467a0bd5ce73ffc46fc97.1597425745.git.andreyknvl@google.com> Mime-Version: 1.0 References: X-Mailer: git-send-email 2.28.0.220.ged08abb693-goog Subject: [PATCH 03/35] kasan: shadow declarations only for software modes From: Andrey Konovalov To: Dmitry Vyukov , Vincenzo Frascino , Catalin Marinas , kasan-dev@googlegroups.com Cc: Andrey Ryabinin , Alexander Potapenko , Marco Elver , Evgenii Stepanov , Elena Petrova , Branislav Rankov , Kevin Brodsky , Will Deacon , Andrew Morton , linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Andrey Konovalov Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: 0EE82100CDA6F X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam04 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: This is a preparatory commit for the upcoming addition of a new hardware tag-based (MTE-based) KASAN mode. Group shadow-related KASAN function declarations and only define them for the two existing software modes. No functional changes for software modes. Signed-off-by: Andrey Konovalov --- include/linux/kasan.h | 44 ++++++++++++++++++++++++++----------------- 1 file changed, 27 insertions(+), 17 deletions(-) diff --git a/include/linux/kasan.h b/include/linux/kasan.h index bd5b4965a269..44a9aae44138 100644 --- a/include/linux/kasan.h +++ b/include/linux/kasan.h @@ -3,16 +3,24 @@ #define _LINUX_KASAN_H #include +#include struct kmem_cache; struct page; struct vm_struct; struct task_struct; -#ifdef CONFIG_KASAN +#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS) #include -#include + +/* Software KASAN implementations use shadow memory. */ + +#ifdef CONFIG_KASAN_SW_TAGS +#define KASAN_SHADOW_INIT 0xFF +#else +#define KASAN_SHADOW_INIT 0 +#endif extern unsigned char kasan_early_shadow_page[PAGE_SIZE]; extern pte_t kasan_early_shadow_pte[PTRS_PER_PTE]; @@ -29,6 +37,23 @@ static inline void *kasan_mem_to_shadow(const void *addr) + KASAN_SHADOW_OFFSET; } +int kasan_add_zero_shadow(void *start, unsigned long size); +void kasan_remove_zero_shadow(void *start, unsigned long size); + +#else /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */ + +static inline int kasan_add_zero_shadow(void *start, unsigned long size) +{ + return 0; +} +static inline void kasan_remove_zero_shadow(void *start, + unsigned long size) +{} + +#endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */ + +#ifdef CONFIG_KASAN + /* Enable reporting bugs after kasan_disable_current() */ extern void kasan_enable_current(void); @@ -69,9 +94,6 @@ struct kasan_cache { int free_meta_offset; }; -int kasan_add_zero_shadow(void *start, unsigned long size); -void kasan_remove_zero_shadow(void *start, unsigned long size); - size_t __ksize(const void *); static inline void kasan_unpoison_slab(const void *ptr) { @@ -137,14 +159,6 @@ static inline bool kasan_slab_free(struct kmem_cache *s, void *object, return false; } -static inline int kasan_add_zero_shadow(void *start, unsigned long size) -{ - return 0; -} -static inline void kasan_remove_zero_shadow(void *start, - unsigned long size) -{} - static inline void kasan_unpoison_slab(const void *ptr) { } static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; } @@ -152,8 +166,6 @@ static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; } #ifdef CONFIG_KASAN_GENERIC -#define KASAN_SHADOW_INIT 0 - void kasan_cache_shrink(struct kmem_cache *cache); void kasan_cache_shutdown(struct kmem_cache *cache); void kasan_record_aux_stack(void *ptr); @@ -168,8 +180,6 @@ static inline void kasan_record_aux_stack(void *ptr) {} #ifdef CONFIG_KASAN_SW_TAGS -#define KASAN_SHADOW_INIT 0xFF - void kasan_init_tags(void); void *kasan_reset_tag(const void *addr); -- 2.28.0.220.ged08abb693-goog