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Tue, 12 Aug 2025 12:50:30 +0000 (UTC) Received: from MiWiFi-R3L-srv.redhat.com (unknown [10.72.112.156]) by mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id D92EC3001458; Tue, 12 Aug 2025 12:50:22 +0000 (UTC) From: Baoquan He To: linux-mm@kvack.org Cc: ryabinin.a.a@gmail.com, glider@google.com, andreyknvl@gmail.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, Baoquan He Subject: [PATCH v2 05/12] arch/arm64: don't initialize kasan if it's disabled Date: Tue, 12 Aug 2025 20:49:34 +0800 Message-ID: <20250812124941.69508-6-bhe@redhat.com> In-Reply-To: <20250812124941.69508-1-bhe@redhat.com> References: <20250812124941.69508-1-bhe@redhat.com> MIME-Version: 1.0 Content-type: text/plain Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 X-Rspam-User: X-Rspamd-Queue-Id: 19A834000F X-Rspamd-Server: rspam06 X-Stat-Signature: nr4tbbstrna8ekf13zqucr67c8kk1j6m X-HE-Tag: 1755003037-506642 X-HE-Meta: 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 rAQYzFMN c3vd34lLHR6U2N+xhuTES0kyE2VpSJKQdEjZMQCW8WyWeJHhovXEbG8ZbIUEWUw9jZIpYSzIhXd+CxIE6cKdeBggwWTKwPEIddfsXJonBs8Rptg/Wv7TYKT159L4vjombHnPLovtkQdCFpZF6fUn/WeUYisAgC4OuYVT5ivMMMATIMs/L0sKErGYl/RmsFlLaSLTFhMYQaEmYJIeVID5eYPeEFlT7m8pWUmzqzJ+oJ+sWtz3xkuDDS5abujlMRaDyJ9CznmKOIjzlNu00PpdBAV/O5ajS57wBydVAj1chnriNJtWusge1XmiWxVCArfwif2wZbXjrFpPGM8HM1irJo7YWidaDcw/Vd+XIomyY+wr9Q+54S1G0fu3BZwqvpLVRmbBMgcLsU3hZXJlSkYBLNdwNqA== 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. And also need skip kasan_populate_early_vm_area_shadow() if kasan is disabled. Signed-off-by: Baoquan He --- arch/arm64/mm/kasan_init.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/arch/arm64/mm/kasan_init.c b/arch/arm64/mm/kasan_init.c index d541ce45daeb..0e4ffe3f5d0e 100644 --- a/arch/arm64/mm/kasan_init.c +++ b/arch/arm64/mm/kasan_init.c @@ -384,6 +384,9 @@ void __init kasan_populate_early_vm_area_shadow(void *start, unsigned long size) { unsigned long shadow_start, shadow_end; + if (!kasan_enabled()) + return; + if (!is_vmalloc_or_module_addr(start)) return; @@ -397,6 +400,9 @@ void __init kasan_populate_early_vm_area_shadow(void *start, unsigned long size) void __init kasan_init(void) { + if (kasan_arg_disabled) + return; + kasan_init_shadow(); kasan_init_depth(); #if defined(CONFIG_KASAN_GENERIC) @@ -405,6 +411,7 @@ void __init kasan_init(void) * Software and Hardware Tag-Based modes still require * kasan_init_sw_tags() and kasan_init_hw_tags() correspondingly. */ + static_branch_enable(&kasan_flag_enabled); pr_info("KernelAddressSanitizer initialized (generic)\n"); #endif } -- 2.41.0