From nobody Sat Oct 4 22:35:29 2025 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (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 E6FF827605A for ; Tue, 12 Aug 2025 12:51:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755003067; cv=none; b=XsjTsV38/Nf8WDkOaEwf3i8LRqpEqhetPOrD6qObpR4fkj/0t3IqQs98UZN6Ymt+q+I7HGbJE5H30CpOKZJv3cJXo59dtAY4HUa6uIqzonHSQS+B11zspo8QVJUkQmtz7b7IYkMOOKPn9uvpQ9aTRSEwB87BZZ3vHNZ38171R1I= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755003067; c=relaxed/simple; bh=tW9LfwmiesUIQ8B3MXDoTo58f31UmD+sTrCG7Yr7V70=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-type; b=fS8FwZn7T87Lcc1q/QqHMlFkiOnyWhMy3baTmPBMDxVkT0zXHnilo28EHn7e/wPkN3Gd/bf4rZMQUk0Reu4IXmDU2p8GzOgsibTLJEQngbHm+pcmDKY2dpRqTmhq2oGBT7BLWibKLsKk+gNkW29r7JOR3rcZUwCBORIt84ezHrQ= 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=ahtF/NiW; arc=none smtp.client-ip=170.10.129.124 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="ahtF/NiW" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1755003064; 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=+hQAnfUidTkYrnmu4spIdiJcPf/3EYQSdRJ9OD5/zYQ=; b=ahtF/NiWFcXUNdLnGkIxRxmtMjUkViwSFb0PKP2ArOCZJN1p+s8YsIafsmOVveg/B6Q8ER yropH7bzPG2VJEkppI2w8tpwypgzdK0/1iJ5e0O06uJTRGX6krc5J1BqLnjsW2XSfluTr/ 0GrVw3q36yt3GUlHXPJyh4278Aw7ya4= Received: from mx-prod-mc-06.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-433-lYRCxuF9OOOH8dMMXILcPA-1; Tue, 12 Aug 2025 08:51:01 -0400 X-MC-Unique: lYRCxuF9OOOH8dMMXILcPA-1 X-Mimecast-MFC-AGG-ID: lYRCxuF9OOOH8dMMXILcPA_1755003059 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-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id D0B1B18004D4; Tue, 12 Aug 2025 12:50:59 +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 A33053001458; Tue, 12 Aug 2025 12:50:52 +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 09/12] arch/x86: don't initialize kasan if it's disabled Date: Tue, 12 Aug 2025 20:49:38 +0800 Message-ID: <20250812124941.69508-10-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. Signed-off-by: Baoquan He --- 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; =20 + if (kasan_arg_disabled) + return; + memcpy(early_top_pgt, init_top_pgt, sizeof(early_top_pgt)); =20 /* @@ -450,6 +453,9 @@ void __init kasan_init(void) /* Flush TLBs again to be sure that write protection applied. */ __flush_tlb_all(); =20 + /* KASAN is now initialized, enable it. */ + static_branch_enable(&kasan_flag_enabled); + init_task.kasan_depth =3D 0; pr_info("KernelAddressSanitizer initialized\n"); } --=20 2.41.0