From nobody Sat Oct 4 22:35:29 2025 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B9C4E2571D7 for ; Tue, 12 Aug 2025 12:50:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755003035; cv=none; b=BO6+rcbJdReKR5beyLKTGeGhwlb51I56Dv2ib6LdmKFsI/7pKp0zM/0ueXbDte66wADYULDfUvALHYEdCuiMYxwzSvkZHAHsMCiXWcD9NuTDFZccMy61p4FU1b/5GQ5eMro0jqQSIDdPUBvlUUTXHH1djgYpn+ZCHYZPEe4Tvzg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755003035; c=relaxed/simple; bh=EKoLFKfDE4OVlIlS/bSiogHROByBDPfoUsBfUqFD6c4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-type; b=SxVplZL5T1a4H2t/ri+PpCOAI2C7xu73lM3gTZ3S/nrxclaMkufxZ+cGminXMFsHRBHd29wpdnw/1oHdLCOqm1JuYE/pOJqAScz9exwMnTuumuVwSHOqFXmn2nzrI+bWZTAK2TyJ3uofe6svkcCRJ9oXXXDoMTG6HbOjfPFweqY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=OZL7wmTm; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="OZL7wmTm" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1755003032; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=xr/w2mK6l802lCxz4VjyI0YPeCChzTlSQ7qvXcEbkU8=; b=OZL7wmTmUr7wQuqiUeKcCzwZwBYPrUZFzc3j25JlXW1FqvCAQbLgT7+1euKFFXENjpDNaI u429XRhd5CUIzwoSYT261FoKbj1AFmKyOG1/JIvyrX2LyETYrhMY7UooXiUArRIFfjzxpy Mb0Htrl0pVmt4tvu5ZaOg0ZChFSRiqc= Received: from mx-prod-mc-02.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-10-XufWQzS-Paee81uzo9E_Ew-1; Tue, 12 Aug 2025 08:50:24 -0400 X-MC-Unique: XufWQzS-Paee81uzo9E_Ew-1 X-Mimecast-MFC-AGG-ID: XufWQzS-Paee81uzo9E_Ew_1755003022 Received: from mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-02.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 24E73195608D; Tue, 12 Aug 2025 12:50:22 +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 7BD173001458; Tue, 12 Aug 2025 12:50:15 +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 04/12] arch/arm: don't initialize kasan if it's disabled Date: Tue, 12 Aug 2025 20:49:33 +0800 Message-ID: <20250812124941.69508-5-bhe@redhat.com> In-Reply-To: <20250812124941.69508-1-bhe@redhat.com> References: <20250812124941.69508-1-bhe@redhat.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 X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 Content-Type: text/plain; charset="utf-8" And also add code to enable kasan_flag_enabled, this is for later usage. Here call jump_label_init() early in setup_arch() so that later kasan_init() can enable static key kasan_flag_enabled. Put jump_label_init() beofre parse_early_param() as other architectures do. Signed-off-by: Baoquan He --- arch/arm/kernel/setup.c | 6 ++++++ arch/arm/mm/kasan_init.c | 6 ++++++ 2 files changed, 12 insertions(+) diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c index 0bfd66c7ada0..453a47a4c715 100644 --- a/arch/arm/kernel/setup.c +++ b/arch/arm/kernel/setup.c @@ -1135,6 +1135,12 @@ void __init setup_arch(char **cmdline_p) early_fixmap_init(); early_ioremap_init(); =20 + /* + * Initialise the static keys early as they may be enabled by the + * kasan_init() or early parameters. + */ + jump_label_init(); + parse_early_param(); =20 #ifdef CONFIG_MMU diff --git a/arch/arm/mm/kasan_init.c b/arch/arm/mm/kasan_init.c index 111d4f703136..c764e1b9c9c5 100644 --- a/arch/arm/mm/kasan_init.c +++ b/arch/arm/mm/kasan_init.c @@ -212,6 +212,8 @@ void __init kasan_init(void) phys_addr_t pa_start, pa_end; u64 i; =20 + if (kasan_arg_disabled) + return; /* * We are going to perform proper setup of shadow memory. * @@ -300,6 +302,10 @@ void __init kasan_init(void) local_flush_tlb_all(); =20 memset(kasan_early_shadow_page, 0, PAGE_SIZE); + + /* KASAN is now initialized, enable it. */ + static_branch_enable(&kasan_flag_enabled); + pr_info("Kernel address sanitizer initialized\n"); init_task.kasan_depth =3D 0; } --=20 2.41.0