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[178.90.89.143]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-55989825fe3sm3022975e87.223.2025.07.17.07.28.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 17 Jul 2025 07:28:02 -0700 (PDT) From: Sabyrzhan Tasbolatov To: hca@linux.ibm.com, christophe.leroy@csgroup.eu, andreyknvl@gmail.com, agordeev@linux.ibm.com, akpm@linux-foundation.org Cc: ryabinin.a.a@gmail.com, glider@google.com, dvyukov@google.com, kasan-dev@googlegroups.com, linux-kernel@vger.kernel.org, loongarch@lists.linux.dev, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-um@lists.infradead.org, linux-mm@kvack.org, snovitoll@gmail.com Subject: [PATCH v3 07/12] kasan/loongarch: select ARCH_DEFER_KASAN and call kasan_init_generic Date: Thu, 17 Jul 2025 19:27:27 +0500 Message-Id: <20250717142732.292822-8-snovitoll@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250717142732.292822-1-snovitoll@gmail.com> References: <20250717142732.292822-1-snovitoll@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: 63hu7rzooqjgka1dfdyonxtuk9z4d359 X-Rspamd-Queue-Id: 1035C100011 X-Rspamd-Server: rspam10 X-Rspam-User: X-HE-Tag: 1752762485-830287 X-HE-Meta: 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 4a+u+VEl 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 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: List-Subscribe: List-Unsubscribe: LoongArch needs deferred KASAN initialization as it has a custom kasan_arch_is_ready() implementation that tracks shadow memory readiness via the kasan_early_stage flag. Select ARCH_DEFER_KASAN to enable the unified static key mechanism for runtime KASAN control. Call kasan_init_generic() which handles Generic KASAN initialization and enables the static key. Replace kasan_arch_is_ready() with kasan_enabled() and delete the flag kasan_early_stage in favor of the unified kasan_enabled() interface. Note that init_task.kasan_depth = 0 is called after kasan_init_generic(), which is different than in other arch kasan_init(). This is left unchanged as it cannot be tested. Closes: https://bugzilla.kernel.org/show_bug.cgi?id=217049 Signed-off-by: Sabyrzhan Tasbolatov --- Changes in v3: - Added CONFIG_ARCH_DEFER_KASAN selection to enable proper runtime control --- arch/loongarch/Kconfig | 1 + arch/loongarch/include/asm/kasan.h | 7 ------- arch/loongarch/mm/kasan_init.c | 7 ++----- 3 files changed, 3 insertions(+), 12 deletions(-) diff --git a/arch/loongarch/Kconfig b/arch/loongarch/Kconfig index 4b19f93379a..07130809a35 100644 --- a/arch/loongarch/Kconfig +++ b/arch/loongarch/Kconfig @@ -9,6 +9,7 @@ config LOONGARCH select ACPI_PPTT if ACPI select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI select ARCH_BINFMT_ELF_STATE + select ARCH_DEFER_KASAN select ARCH_DISABLE_KASAN_INLINE select ARCH_ENABLE_MEMORY_HOTPLUG select ARCH_ENABLE_MEMORY_HOTREMOVE diff --git a/arch/loongarch/include/asm/kasan.h b/arch/loongarch/include/asm/kasan.h index 62f139a9c87..0e50e5b5e05 100644 --- a/arch/loongarch/include/asm/kasan.h +++ b/arch/loongarch/include/asm/kasan.h @@ -66,7 +66,6 @@ #define XKPRANGE_WC_SHADOW_OFFSET (KASAN_SHADOW_START + XKPRANGE_WC_KASAN_OFFSET) #define XKVRANGE_VC_SHADOW_OFFSET (KASAN_SHADOW_START + XKVRANGE_VC_KASAN_OFFSET) -extern bool kasan_early_stage; extern unsigned char kasan_early_shadow_page[PAGE_SIZE]; #define kasan_mem_to_shadow kasan_mem_to_shadow @@ -75,12 +74,6 @@ void *kasan_mem_to_shadow(const void *addr); #define kasan_shadow_to_mem kasan_shadow_to_mem const void *kasan_shadow_to_mem(const void *shadow_addr); -#define kasan_arch_is_ready kasan_arch_is_ready -static __always_inline bool kasan_arch_is_ready(void) -{ - return !kasan_early_stage; -} - #define addr_has_metadata addr_has_metadata static __always_inline bool addr_has_metadata(const void *addr) { diff --git a/arch/loongarch/mm/kasan_init.c b/arch/loongarch/mm/kasan_init.c index d2681272d8f..cf8315f9119 100644 --- a/arch/loongarch/mm/kasan_init.c +++ b/arch/loongarch/mm/kasan_init.c @@ -40,11 +40,9 @@ static pgd_t kasan_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE); #define __pte_none(early, pte) (early ? pte_none(pte) : \ ((pte_val(pte) & _PFN_MASK) == (unsigned long)__pa(kasan_early_shadow_page))) -bool kasan_early_stage = true; - void *kasan_mem_to_shadow(const void *addr) { - if (!kasan_arch_is_ready()) { + if (!kasan_enabled()) { return (void *)(kasan_early_shadow_page); } else { unsigned long maddr = (unsigned long)addr; @@ -298,7 +296,7 @@ void __init kasan_init(void) kasan_populate_early_shadow(kasan_mem_to_shadow((void *)VMALLOC_START), kasan_mem_to_shadow((void *)KFENCE_AREA_END)); - kasan_early_stage = false; + kasan_init_generic(); /* Populate the linear mapping */ for_each_mem_range(i, &pa_start, &pa_end) { @@ -329,5 +327,4 @@ void __init kasan_init(void) /* At this point kasan is fully initialized. Enable error messages */ init_task.kasan_depth = 0; - pr_info("KernelAddressSanitizer initialized.\n"); } -- 2.34.1