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=-8.3 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_IN_DEF_DKIM_WL 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 163E0CA9EBB for ; Thu, 24 Oct 2019 22:17:40 +0000 (UTC) Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by mail.kernel.org (Postfix) with SMTP id 5D81820663 for ; Thu, 24 Oct 2019 22:17:39 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="u1/fHDmx" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5D81820663 Authentication-Results: mail.kernel.org; dmarc=fail (p=reject dis=none) header.from=google.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kernel-hardening-return-17101-kernel-hardening=archiver.kernel.org@lists.openwall.com Received: (qmail 10026 invoked by uid 550); 24 Oct 2019 22:17:32 -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 10006 invoked from network); 24 Oct 2019 22:17:32 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=qHNXsthwregcyrL2BKVfLqYllW87y6QVnA+Lbr5Rgec=; b=u1/fHDmx2F03gUdsJoRaJfl7aP6BcoOTQj7WuOKplTSdf6uXX1E0Rf1hGTjZ93euSU NJGI0hMli675V4W1F5aGYPIB6vXEndENuc9l4uQvSvWlXKnpA/Q0fOf41lKCkzVymcMj vSAvJbnieQzBs39rOqmCk2ja2JZ+n2tLqqkQvWScrAsxpi7g4yEkQAJHTgbS1XIOEKGc ZIEUfghKoKXuOS8kPtcMk4jtp/voE4nzOI5nX/zgK6dajQqfV49v6nb1hfQWLq1Yey8y KbnrEILxVOYi9Z6E2nmjX/uSwH9bskxev0otzP5fbZ4T6AZwWHNu+W94Q+UntLXVb7q4 mXtg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=qHNXsthwregcyrL2BKVfLqYllW87y6QVnA+Lbr5Rgec=; b=XeMYmySnQDZPjqWuKy35JzO3ZHJabL8KUaMx/X6adaKMzy77pQpB91vubG/ubXrSQd GTavMRm76GUINLkuiMWB6mSoQlq9+ECe59F0Q4eKUGRFlGa5EeJQdd9DEDHK5zgBGkIP nLyfAIIVROfDzljv52wrSjwk/K/bnvibPyBWdu4f9xVKjAL5IVHNkakNH9vJhJ34mN8+ no9PVZGwribYBRTypk+gcwiou7n1aK6EbuJCTY03Rxd0kcIUTMaouu5NbXuzROQj5jVm +8oa31h78Z5j8fRzOm62uI1Yp2FLr97rVb3Icg1UmLnjW87MlvXmymWxt9wQD6I7N9BZ eKDA== X-Gm-Message-State: APjAAAXj4lfzhL7iVrHIONB/bryAkAQxVBZatEYXLWSHHB1q2WGiW2VZ YibcV+obowuuciB8RwwfxIcol1r9RZF+1AEAFTy81g== X-Google-Smtp-Source: APXvYqyC5R+J94HY0QZwShcMklCS8zj2eZiTO4Hh3KIgdjFp8g8gOvA8xc0s1anKvCDkBcvEQB2MlCQ7jEx4vRyMG+k= X-Received: by 2002:a05:6102:36a:: with SMTP id f10mr324969vsa.44.1571955439473; Thu, 24 Oct 2019 15:17:19 -0700 (PDT) MIME-Version: 1.0 References: <20191018161033.261971-1-samitolvanen@google.com> <20191018161033.261971-7-samitolvanen@google.com> <20191022162826.GC699@lakrids.cambridge.arm.com> <20191024080418.35423b36@gandalf.local.home> In-Reply-To: <20191024080418.35423b36@gandalf.local.home> From: Sami Tolvanen Date: Thu, 24 Oct 2019 15:17:08 -0700 Message-ID: Subject: Re: [PATCH 06/18] add support for Clang's Shadow Call Stack (SCS) To: Steven Rostedt Cc: Mark Rutland , Masahiro Yamada , Will Deacon , Catalin Marinas , Ard Biesheuvel , Dave Martin , Kees Cook , Laura Abbott , Nick Desaulniers , clang-built-linux , Kernel Hardening , linux-arm-kernel , LKML Content-Type: text/plain; charset="UTF-8" On Thu, Oct 24, 2019 at 5:04 AM Steven Rostedt wrote: > You can remove a CFLAGS for a whole directory. lib, kernel/trace and > others do this. Look at kernel/trace/Makefile, we have: > > ORIG_CFLAGS := $(KBUILD_CFLAGS) > KBUILD_CFLAGS = $(subst $(CC_FLAGS_FTRACE),,$(ORIG_CFLAGS)) That definitely looks less invasive in this case than adding ccflags-remove-y, since we only really need this for one directory. I'll use this in v2. Thanks, Steven. Sami