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[2.135.54.165]) by smtp.gmail.com with ESMTPSA id 38308e7fff4ca-32b980a36c0sm19311851fa.62.2025.06.25.02.52.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 25 Jun 2025 02:52:41 -0700 (PDT) From: Sabyrzhan Tasbolatov To: ryabinin.a.a@gmail.com, glider@google.com, andreyknvl@gmail.com, dvyukov@google.com, vincenzo.frascino@arm.com, catalin.marinas@arm.com, will@kernel.org, chenhuacai@kernel.org, kernel@xen0n.name, maddy@linux.ibm.com, mpe@ellerman.id.au, npiggin@gmail.com, christophe.leroy@csgroup.eu, hca@linux.ibm.com, gor@linux.ibm.com, agordeev@linux.ibm.com, borntraeger@linux.ibm.com, svens@linux.ibm.com, richard@nod.at, anton.ivanov@cambridgegreys.com, johannes@sipsolutions.net, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, chris@zankel.net, jcmvbkbc@gmail.com, akpm@linux-foundation.org Cc: guoweikang.kernel@gmail.com, geert@linux-m68k.org, rppt@kernel.org, tiwei.btw@antgroup.com, richard.weiyang@gmail.com, benjamin.berg@intel.com, kevin.brodsky@arm.com, kasan-dev@googlegroups.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, loongarch@lists.linux.dev, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, linux-um@lists.infradead.org, linux-mm@kvack.org, snovitoll@gmail.com Subject: [PATCH 0/9] kasan: unify kasan_arch_is_ready with kasan_enabled Date: Wed, 25 Jun 2025 14:52:15 +0500 Message-Id: <20250625095224.118679-1-snovitoll@gmail.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit This patch series unifies the kasan_arch_is_ready() and kasan_enabled() interfaces by extending the existing kasan_enabled() infrastructure to work consistently across all KASAN modes (Generic, SW_TAGS, HW_TAGS). Currently, kasan_enabled() only works for HW_TAGS mode using a static key, while other modes either return IS_ENABLED(CONFIG_KASAN) (compile-time constant) or rely on architecture-specific kasan_arch_is_ready() implementations with custom static keys and global variables. This leads to: - Code duplication across architectures - Inconsistent runtime behavior between KASAN modes - Architecture-specific readiness tracking After this series: - All KASAN modes use the same kasan_flag_enabled static key - Consistent runtime enable/disable behavior across modes - Simplified architecture code with unified kasan_init_generic() calls - Elimination of arch specific kasan_arch_is_ready() implementations - Unified vmalloc integration using kasan_enabled() checks This addresses the bugzilla issue [1] about making kasan_flag_enabled and kasan_enabled() work for Generic mode, and extends it to provide true unification across all modes. [1] https://bugzilla.kernel.org/show_bug.cgi?id=217049 === Current mainline KUnit status To see if there is any regression, I've tested first on the following commit 739a6c93cc75 ("Merge tag 'nfsd-6.16-1' of git://git.kernel.org/pub/scm/linux/kernel/git/cel/linux"). Tested via compiling a kernel with CONFIG_KASAN_KUNIT_TEST and running QEMU VM. There are failing tests in SW_TAGS and GENERIC modes in arm64: arm64 CONFIG_KASAN_HW_TAGS: # kasan: pass:62 fail:0 skip:13 total:75 # Totals: pass:62 fail:0 skip:13 total:75 ok 1 kasan arm64 CONFIG_KASAN_SW_TAGS=y: # kasan: pass:65 fail:1 skip:9 total:75 # Totals: pass:65 fail:1 skip:9 total:75 not ok 1 kasan # kasan_strings: EXPECTATION FAILED at mm/kasan/kasan_test_c.c:1598 KASAN failure expected in "strscpy(ptr, src + KASAN_GRANULE_SIZE, KASAN_GRANULE_SIZE)", but none occurred arm64 CONFIG_KASAN_GENERIC=y, CONFIG_KASAN_OUTLINE=y: # kasan: pass:61 fail:1 skip:13 total:75 # Totals: pass:61 fail:1 skip:13 total:75 not ok 1 kasan # same failure as above x86_64 CONFIG_KASAN_GENERIC=y: # kasan: pass:58 fail:0 skip:17 total:75 # Totals: pass:58 fail:0 skip:17 total:75 ok 1 kasan === Testing with the patches: * arm64 (GENERIC, HW_TAGS, SW_TAGS): no regression, same above results. * x86_64 (GENERIC): no regression, no errors === NB I haven't tested on the following arch. due to the absence of qemu-system- support on those arch on my machine. So I defer this to relevant arch people to test KASAN initialization: - loongarch - s390 - um - xtensa - powerpc Sabyrzhan Tasbolatov (9): kasan: unify static kasan_flag_enabled across modes kasan: replace kasan_arch_is_ready with kasan_enabled kasan/arm64: call kasan_init_generic in kasan_init kasan/xtensa: call kasan_init_generic in kasan_init kasan/loongarch: call kasan_init_generic in kasan_init kasan/um: call kasan_init_generic in kasan_init kasan/x86: call kasan_init_generic in kasan_init kasan/s390: call kasan_init_generic in kasan_init kasan/powerpc: call kasan_init_generic in kasan_init arch/arm64/mm/kasan_init.c | 4 +--- arch/loongarch/include/asm/kasan.h | 7 ------- arch/loongarch/mm/kasan_init.c | 7 ++----- arch/powerpc/include/asm/kasan.h | 14 -------------- arch/powerpc/mm/kasan/init_book3s_64.c | 6 +----- arch/s390/kernel/early.c | 2 +- arch/um/include/asm/kasan.h | 5 ----- arch/um/kernel/mem.c | 4 ++-- arch/x86/mm/kasan_init_64.c | 2 +- arch/xtensa/mm/kasan_init.c | 2 +- include/linux/kasan-enabled.h | 22 ++++++++++++++++------ include/linux/kasan.h | 6 ++++++ mm/kasan/common.c | 15 +++++++++++---- mm/kasan/generic.c | 17 ++++++++++++++--- mm/kasan/hw_tags.c | 7 ------- mm/kasan/kasan.h | 6 ------ mm/kasan/shadow.c | 15 +++------------ mm/kasan/sw_tags.c | 2 ++ 18 files changed, 61 insertions(+), 82 deletions(-) -- 2.34.1