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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=gbewbhEM/mrEwI9f62OGQ1mBf+mvC6G7M7H1HOVG3uM=; b=MPHonCarc3CQOJXbQsyv41S5oSVotyRr5c2uOuDyrGQfxHBIc3P21mGX+r2+RvCDou GbiKEb7pIfV6hVsdnes58UUPhZE09iAYIH+qSRWuBmqXwgy7ott6Sn/TjgU1j+DKb7p9 BNTmYakYfLiY8un1WvLYhlSJyMiH3JGhWUsWz7yJ/uFZtpSbMg4dzM/FKn4Gadc9JoA0 SLpdJ6GTxjZ87sjNBb5N3ZY2SZmt6XGXh/0jUQQXA7obOJhQYFlLbWy3gQPMxFlObnuj yKGyRN+96U1IdRfqIN2+ueyb5mQtVCLOm6/xGzN+3WDwNEjQMCcn2Dfg0WKkR57cnHXc QgKg== X-Gm-Message-State: AOAM532IhAKgHP/0aKeCab8ZwRxslyPAzI2mdx8FI8X1+1xmrRYWGCVY F/pl9Lf+qGYFefv7lPGsrUDRx9wmr0Ccq5zd X-Google-Smtp-Source: ABdhPJyuuU97eSpS4icZpwsOHx+U2pkrSyE9d1bvaPq4xdMC1pLHfzAVpabPi/a/WtW8O3//dWoEdWo8B9DvLadS X-Received: by 2002:a7b:ca4b:: with SMTP id m11mr3338115wml.120.1597426072804; Fri, 14 Aug 2020 10:27:52 -0700 (PDT) Date: Fri, 14 Aug 2020 19:26:54 +0200 In-Reply-To: Message-Id: <63a51e69950d6d93714a96d51165cdc332552393.1597425745.git.andreyknvl@google.com> Mime-Version: 1.0 References: X-Mailer: git-send-email 2.28.0.220.ged08abb693-goog Subject: [PATCH 12/35] kasan, arm64: only init shadow 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: 7A7E81803F9B2 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam03 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. Hardware tag-based KASAN won't be using shadow memory. Only initialize it when one of the software KASAN modes are enabled. No functional changes for software modes. Signed-off-by: Andrey Konovalov --- arch/arm64/include/asm/kasan.h | 8 ++++++-- arch/arm64/mm/kasan_init.c | 15 ++++++++++++++- 2 files changed, 20 insertions(+), 3 deletions(-) diff --git a/arch/arm64/include/asm/kasan.h b/arch/arm64/include/asm/kasan.h index b0dc4abc3589..f7ea70d02cab 100644 --- a/arch/arm64/include/asm/kasan.h +++ b/arch/arm64/include/asm/kasan.h @@ -13,6 +13,12 @@ #define arch_kasan_get_tag(addr) __tag_get(addr) #ifdef CONFIG_KASAN +void kasan_init(void); +#else +static inline void kasan_init(void) { } +#endif + +#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS) /* * KASAN_SHADOW_START: beginning of the kernel virtual addresses. @@ -33,12 +39,10 @@ #define _KASAN_SHADOW_START(va) (KASAN_SHADOW_END - (1UL << ((va) - KASAN_SHADOW_SCALE_SHIFT))) #define KASAN_SHADOW_START _KASAN_SHADOW_START(vabits_actual) -void kasan_init(void); void kasan_copy_shadow(pgd_t *pgdir); asmlinkage void kasan_early_init(void); #else -static inline void kasan_init(void) { } static inline void kasan_copy_shadow(pgd_t *pgdir) { } #endif diff --git a/arch/arm64/mm/kasan_init.c b/arch/arm64/mm/kasan_init.c index 7291b26ce788..4d35eaf3ec97 100644 --- a/arch/arm64/mm/kasan_init.c +++ b/arch/arm64/mm/kasan_init.c @@ -21,6 +21,8 @@ #include #include +#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS) + static pgd_t tmp_pg_dir[PTRS_PER_PGD] __initdata __aligned(PGD_SIZE); /* @@ -208,7 +210,7 @@ static void __init clear_pgds(unsigned long start, set_pgd(pgd_offset_k(start), __pgd(0)); } -void __init kasan_init(void) +static void __init kasan_init_shadow(void) { u64 kimg_shadow_start, kimg_shadow_end; u64 mod_shadow_start, mod_shadow_end; @@ -269,6 +271,17 @@ void __init kasan_init(void) memset(kasan_early_shadow_page, KASAN_SHADOW_INIT, PAGE_SIZE); cpu_replace_ttbr1(lm_alias(swapper_pg_dir)); +} + +#else /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS) */ + +static inline void __init kasan_init_shadow(void) { } + +#endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */ + +void __init kasan_init(void) +{ + kasan_init_shadow(); /* At this point kasan is fully initialized. Enable error messages */ init_task.kasan_depth = 0; -- 2.28.0.220.ged08abb693-goog