From patchwork Tue Dec 13 18:04:02 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Jones X-Patchwork-Id: 13072305 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id DACD4C4167B for ; Tue, 13 Dec 2022 18:05:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236388AbiLMSFG (ORCPT ); Tue, 13 Dec 2022 13:05:06 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40618 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236362AbiLMSFE (ORCPT ); Tue, 13 Dec 2022 13:05:04 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 07ACA23E99 for ; Tue, 13 Dec 2022 10:04:15 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1670954655; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=JF2s0tm6WDQRqQHFNtrMHbtnveQJl7hXDtEAPn+pSMA=; b=WExQXCoiOPsQA4r18oIk1+CGOYqpJIFeVqqnMGsLIQAPKwg0U8B+sCOnDcXhVex52A3WhV DrGR84le3eGfrbvm7gnu9AqU87RQVMKVk81YEbVri7vhdMq2zL795K4RjUZMMTCr2Z1gky 0nGvWDAFLk4SMk0Kf+HvkFq/88x/AQk= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-97-_ZICaESyNZOLTHro1IRTMg-1; Tue, 13 Dec 2022 13:04:11 -0500 X-MC-Unique: _ZICaESyNZOLTHro1IRTMg-1 Received: from smtp.corp.redhat.com (int-mx10.intmail.prod.int.rdu2.redhat.com [10.11.54.10]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 0A4DA29324AF; Tue, 13 Dec 2022 18:04:11 +0000 (UTC) Received: from random.internal.datastacks.com (unknown [10.2.17.61]) by smtp.corp.redhat.com (Postfix) with ESMTP id 6BED3492B02; Tue, 13 Dec 2022 18:04:10 +0000 (UTC) From: Peter Jones To: Evgeniy Baskov Cc: Ard Biesheuvel , Borislav Petkov , Andy Lutomirski , Dave Hansen , Ingo Molnar , Peter Zijlstra , Thomas Gleixner , Alexey Khoroshilov , Peter Jones , Mario Limonciello , joeyli , lvc-project@linuxtesting.org, x86@kernel.org, linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org Subject: [PATCH 1/2] efi/x86: don't set unsupported memory attributes Date: Tue, 13 Dec 2022 13:04:02 -0500 Message-Id: <20221213180403.1308507-1-pjones@redhat.com> In-Reply-To: <20221213180317.qoy2l3mcpjparocq@redhat.com> References: <20221213180317.qoy2l3mcpjparocq@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.10 Precedence: bulk List-ID: X-Mailing-List: linux-hardening@vger.kernel.org On platforms where the firmware uses DXE, but which do not implement the EFI Memory Attribute Protocol, we implement W^X support using DXE's set_memory_attributes() call. This call will fail without making any changes if an attribute is set that isn't supported on the platform. This patch changes efi_adjust_memory_range_protection() to avoid trying to set any attribute bits that aren't set in the memory region's capability flags. Signed-off-by: Peter Jones --- drivers/firmware/efi/libstub/mem.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/firmware/efi/libstub/mem.c b/drivers/firmware/efi/libstub/mem.c index d10996e4eb0..d52841adcc2 100644 --- a/drivers/firmware/efi/libstub/mem.c +++ b/drivers/firmware/efi/libstub/mem.c @@ -192,6 +192,7 @@ static efi_status_t adjust_mem_attrib_dxe(efi_physical_addr_t rounded_start, desc.attributes &= ~(EFI_MEMORY_RO | EFI_MEMORY_XP); desc.attributes |= attributes; + desc.attributes &= desc.capabilities; unprotect_start = max(rounded_start, desc.base_address); unprotect_size = min(rounded_end, next) - unprotect_start;