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Wed, 20 Aug 2025 05:36:33 +0000 (UTC) Received: from MiWiFi-R3L-srv.redhat.com (unknown [10.72.112.99]) by mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 712EF19560B0; Wed, 20 Aug 2025 05:36:25 +0000 (UTC) From: Baoquan He To: linux-mm@kvack.org Cc: ryabinin.a.a@gmail.com, andreyknvl@gmail.com, glider@google.com, dvyukov@google.com, vincenzo.frascino@arm.com, akpm@linux-foundation.org, kasan-dev@googlegroups.com, linux-kernel@vger.kernel.org, kexec@lists.infradead.org, sj@kernel.org, lorenzo.stoakes@oracle.com, elver@google.com, snovitoll@gmail.com, christophe.leroy@csgroup.eu, Baoquan He , x86@kernel.org Subject: [PATCH v3 09/12] arch/x86: don't initialize kasan if it's disabled Date: Wed, 20 Aug 2025 13:34:56 +0800 Message-ID: <20250820053459.164825-10-bhe@redhat.com> In-Reply-To: <20250820053459.164825-1-bhe@redhat.com> References: <20250820053459.164825-1-bhe@redhat.com> MIME-Version: 1.0 Content-type: text/plain Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 X-Stat-Signature: xnijcgyn54kiog3yssjypmjc14asucz6 X-Rspam-User: X-Rspamd-Queue-Id: 5D3B480005 X-Rspamd-Server: rspam05 X-HE-Tag: 1755668200-137963 X-HE-Meta: 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 vPRpJqRR E8k/u0keGBGFud+JhlI33HipmJWMCZNlbkX2VdKoTV5GbyPKbSWlr4/j5v3ZNfKDS0GaUV7mPXHR49armSMGEJ8K7KQh/faVL7U2F4JdabJeJ/7l+wVOQf3SK5iTimBE3UT3E6/SUZfaB9UMiHVNXl/VITWRDka9aZqXh6g3K5QfjWHYzfz8M5lbtJpcRr1RagW+P7WilvH+jXl5RwGJ1D76JoAReDEtJP5hbB5PlChPU9sl3lv5+S6uEKKTozZL38qnsBPtTxxnVaSn80kj1sgpMRndSd8Yd5hdFb0RbtI8rYA02nqIBKqcOAauektOSlC98t8DMNyO7te1Xjxi+ApHXZrK/J1gPYiyjB4pQzstnj/xG+Y9s+xIr8Kitr5um+hvcLL5PYOmPcOEsnAmSEjmfSxFsuwaPZmfj03bfGvrLWuI= 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: And also add code to enable kasan_flag_enabled, this is for later usage. Signed-off-by: Baoquan He Cc: x86@kernel.org --- arch/x86/mm/kasan_init_64.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/x86/mm/kasan_init_64.c b/arch/x86/mm/kasan_init_64.c index 0539efd0d216..0f2f9311e9df 100644 --- a/arch/x86/mm/kasan_init_64.c +++ b/arch/x86/mm/kasan_init_64.c @@ -343,6 +343,9 @@ void __init kasan_init(void) unsigned long shadow_cea_begin, shadow_cea_per_cpu_begin, shadow_cea_end; int i; + if (kasan_arg_disabled) + return; + memcpy(early_top_pgt, init_top_pgt, sizeof(early_top_pgt)); /* @@ -450,6 +453,9 @@ void __init kasan_init(void) /* Flush TLBs again to be sure that write protection applied. */ __flush_tlb_all(); + /* KASAN is now initialized, enable it. */ + static_branch_enable(&kasan_flag_enabled); + init_task.kasan_depth = 0; pr_info("KernelAddressSanitizer initialized\n"); } -- 2.41.0