From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.0 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 04E09C433E1 for ; Mon, 27 Jul 2020 21:50:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D00F42075D for ; Mon, 27 Jul 2020 21:50:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726739AbgG0Vuv (ORCPT ); Mon, 27 Jul 2020 17:50:51 -0400 Received: from mail-qv1-f67.google.com ([209.85.219.67]:46639 "EHLO mail-qv1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726110AbgG0Vuu (ORCPT ); Mon, 27 Jul 2020 17:50:50 -0400 Received: by mail-qv1-f67.google.com with SMTP id j10so1557968qvo.13 for ; Mon, 27 Jul 2020 14:50:50 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=c5nWJ6DStWaAwLBBJDt4epCRA3xXREXZG+dLKv9/lT4=; b=VaO2TjW+i4K0l53fSFs6KqbubNkZnHsxbN7MAW1tHvZ0Lpn278dX7vp9IS86320Qst ZGbaq6ceYus0E+g0IWKQR07rkjRCmAkMhC6/v9jA1YUe+6SzFEVJpFu5PYMLm23kiwkW UhLzVHhEzU9XvGT+TxqCJqOV+FeUQwDTbWOFkw5eYv/PJbv+nGq5JoC0GX4VWefn1iRs El9TYQuT787GezO30qZsDbltJzc6W0mASo1W6CSpSG8llYgdo8fVJHx5XtSaLj9TQZfx 5tjg6rTTlDs3QhAcAXYUfrUPmGfd+Nm6e0deS4049ES5LFR2oiVDPKHbhFNDfePw2+Bf jdBw== X-Gm-Message-State: AOAM530dMla0TMiMUeBu79Uple8tb3o+Yv4nrjc+X8F3vQwbUpraDA/v Q7RI9oxVDm5fgXZy/OrOGc8= X-Google-Smtp-Source: ABdhPJzFB44eBD2XPbrHnPQMDfQf5n3tEzOf39AtdsWbUywdx0/MCGH1J5nTiM2J1jzVKbKS4pvANA== X-Received: by 2002:a0c:ec86:: with SMTP id u6mr11266941qvo.58.1595886649564; Mon, 27 Jul 2020 14:50:49 -0700 (PDT) Received: from rani.riverdale.lan ([2001:470:1f07:5f3::b55f]) by smtp.gmail.com with ESMTPSA id n90sm15629338qte.21.2020.07.27.14.50.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 27 Jul 2020 14:50:49 -0700 (PDT) From: Arvind Sankar To: Kees Cook , x86@kernel.org Cc: linux-kernel@vger.kernel.org Subject: [PATCH 0/8] x86/kaslr: Cleanup and small bugfixes Date: Mon, 27 Jul 2020 17:50:39 -0400 Message-Id: <20200727215047.3341098-1-nivedita@alum.mit.edu> X-Mailer: git-send-email 2.26.2 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The first 7 patches are cleanup and minor bugfixes on the x86 KASLR code. The last one is a bit of an RFC. The memory regions used for KASLR are stored as 64-bit even on a 32-bit kernel. However there are still a few local variables that are 32-bit, but should be ok as far as I can see because they are assigned values that have been already limited to 32-bit. It does make it a little harder to verify that the code is correct. Since KASLR cannot actually use 64-bit regions for the 32-bit kernel, the patch reduces regions to their below-4G segment when creating them, making the actual variables 32-bit. Alternatively, the few local variables could be upgraded to 64-bit. Arvind Sankar (8): x86/kaslr: Make command line handling safer x86/kaslr: Remove bogus warning and unnecessary goto x86/kaslr: Fix process_efi_entries comment x86/kaslr: Initialize mem_limit to the real maximum address x86/kaslr: Simplify __process_mem_region x86/kaslr: Simplify process_gb_huge_pages x86/kaslr: Clean up slot handling x86/kaslr: Don't use 64-bit mem_vector for 32-bit kernel arch/x86/boot/compressed/acpi.c | 7 +- arch/x86/boot/compressed/kaslr.c | 228 ++++++++++++------------------- arch/x86/boot/compressed/misc.h | 19 ++- 3 files changed, 111 insertions(+), 143 deletions(-) -- 2.26.2