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[178.90.89.143]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-55989825fe3sm3022975e87.223.2025.07.17.07.28.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 17 Jul 2025 07:28:06 -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 08/12] kasan/um: select ARCH_DEFER_KASAN and call kasan_init_generic Date: Thu, 17 Jul 2025 19:27:28 +0500 Message-Id: <20250717142732.292822-9-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> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" UserMode Linux needs deferred KASAN initialization as it has a custom kasan_arch_is_ready() implementation that tracks shadow memory readiness via the kasan_um_is_ready 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. Delete the key kasan_um_is_ready in favor of the unified kasan_enabled() interface. Note that kasan_init_generic has __init macro, which is called by kasan_init() which is not marked with __init in arch/um code. Closes: https://bugzilla.kernel.org/show_bug.cgi?id=3D217049 Signed-off-by: Sabyrzhan Tasbolatov --- Changes in v3: - Added CONFIG_ARCH_DEFER_KASAN selection for proper runtime control --- arch/um/Kconfig | 1 + arch/um/include/asm/kasan.h | 5 ----- arch/um/kernel/mem.c | 4 ++-- 3 files changed, 3 insertions(+), 7 deletions(-) diff --git a/arch/um/Kconfig b/arch/um/Kconfig index f08e8a7fac9..fd6d78bba52 100644 --- a/arch/um/Kconfig +++ b/arch/um/Kconfig @@ -8,6 +8,7 @@ config UML select ARCH_WANTS_DYNAMIC_TASK_STRUCT select ARCH_HAS_CPU_FINALIZE_INIT select ARCH_HAS_FORTIFY_SOURCE + select ARCH_DEFER_KASAN select ARCH_HAS_GCOV_PROFILE_ALL select ARCH_HAS_KCOV select ARCH_HAS_STRNCPY_FROM_USER diff --git a/arch/um/include/asm/kasan.h b/arch/um/include/asm/kasan.h index f97bb1f7b85..81bcdc0f962 100644 --- a/arch/um/include/asm/kasan.h +++ b/arch/um/include/asm/kasan.h @@ -24,11 +24,6 @@ =20 #ifdef CONFIG_KASAN void kasan_init(void); -extern int kasan_um_is_ready; - -#ifdef CONFIG_STATIC_LINK -#define kasan_arch_is_ready() (kasan_um_is_ready) -#endif #else static inline void kasan_init(void) { } #endif /* CONFIG_KASAN */ diff --git a/arch/um/kernel/mem.c b/arch/um/kernel/mem.c index 76bec7de81b..058cb70e330 100644 --- a/arch/um/kernel/mem.c +++ b/arch/um/kernel/mem.c @@ -21,9 +21,9 @@ #include #include #include +#include =20 #ifdef CONFIG_KASAN -int kasan_um_is_ready; void kasan_init(void) { /* @@ -32,7 +32,7 @@ void kasan_init(void) */ kasan_map_memory((void *)KASAN_SHADOW_START, KASAN_SHADOW_SIZE); init_task.kasan_depth =3D 0; - kasan_um_is_ready =3D true; + kasan_init_generic(); } =20 static void (*kasan_init_ptr)(void) --=20 2.34.1