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=-0.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS 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 395C6CA9EA0 for ; Tue, 22 Oct 2019 16:28:03 +0000 (UTC) Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by mail.kernel.org (Postfix) with SMTP id 8272921783 for ; Tue, 22 Oct 2019 16:28:02 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="Akp0RE/L" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8272921783 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=chromium.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kernel-hardening-return-17088-kernel-hardening=archiver.kernel.org@lists.openwall.com Received: (qmail 30276 invoked by uid 550); 22 Oct 2019 16:27:56 -0000 Mailing-List: contact kernel-hardening-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-ID: Received: (qmail 30226 invoked from network); 22 Oct 2019 16:27:55 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=yCqef9gQT6nmyTqqGL+wlHZ1CGtJs3cHNc9rYV1fhGQ=; b=Akp0RE/L/DluE7lJNU+chwNolLm4k9jsXnFTp9tcKG5xdcIVWiC2r0h9i0cwWyG7m7 1M0XchljXyxrcF5F3z8kYQRl4stUEGdCXI7OA+TvymmMfiDz9QjnwWIItRChIyof8pgy LqJ1hg3+WyGv6FMYaKq9RKP9Q3ZF+joMQTEmY= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=yCqef9gQT6nmyTqqGL+wlHZ1CGtJs3cHNc9rYV1fhGQ=; b=dLY0+aUCjtGWOHXpqq/Tacf0yE7+IaDSAWJAXKATiqT8QFkpyq5qlOXAqeqDL1DLkL ZZTz4XVeKSoCZpFXfsq8Kg/QQHYjMx743vfELeR/eMalp35TP3OGywLjmEdfp08qnY83 +iX58gjNs1RK73ywI/o+t3h+80AFuXrwUGx13SN0QaYthuurma1FhiUfrx3hZkTPlMqa BWUWv0JKIFoyCDW6Hk0Egp41eusves9lCV0zBi+hvRGRKa11dClJRf592W5JKthV3uHj M+COdyscUhWmpEaw42WsxSEKnS9fj1yogUvij3tJw2x86ulrXqbd40ioLUJ5+RPeSWNb BXDw== X-Gm-Message-State: APjAAAUH1ZgmRb0iosGWBdlPI2zBY9m0wxrX/QDl+Jwy/epkBALkliRG SPxgRuGv9r1XS4+4NfwCmuQndQ== X-Google-Smtp-Source: APXvYqy0V08cVd3k9DTb6b5fAVT9pV7tar1OJtZIZQ+pxwtsG2Lik9okZfxhxg4bRHHBWocLCOzgYQ== X-Received: by 2002:a63:68c8:: with SMTP id d191mr4555216pgc.197.1571761662807; Tue, 22 Oct 2019 09:27:42 -0700 (PDT) Date: Tue, 22 Oct 2019 09:27:40 -0700 From: Kees Cook To: Mark Rutland Cc: Nick Desaulniers , Sami Tolvanen , Will Deacon , Catalin Marinas , Steven Rostedt , Ard Biesheuvel , Dave Martin , Laura Abbott , clang-built-linux , Kernel Hardening , Linux ARM , LKML Subject: Re: [PATCH 12/18] arm64: reserve x18 only with Shadow Call Stack Message-ID: <201910220926.B78C4D88@keescook> References: <20191018161033.261971-1-samitolvanen@google.com> <20191018161033.261971-13-samitolvanen@google.com> <20191022160010.GB699@lakrids.cambridge.arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20191022160010.GB699@lakrids.cambridge.arm.com> On Tue, Oct 22, 2019 at 05:00:10PM +0100, Mark Rutland wrote: > If we wanted to, we could periodically grep for x18 to find any illicit > usage. Now we need objtool for arm64! :) (It seems CONFIG_HAVE_STACK_VALIDATION is rather a narrow description for what objtool does now...) -- Kees Cook