From patchwork Wed Nov 18 22:07:28 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sami Tolvanen X-Patchwork-Id: 11916045 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=-26.2 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT,USER_IN_DEF_DKIM_WL autolearn=unavailable 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 611C7C5519F for ; Wed, 18 Nov 2020 22:10:13 +0000 (UTC) Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by mail.kernel.org (Postfix) with SMTP id 69A692054F for ; Wed, 18 Nov 2020 22:10:12 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="bQOrgmvm" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 69A692054F 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-20420-kernel-hardening=archiver.kernel.org@lists.openwall.com Received: (qmail 7326 invoked by uid 550); 18 Nov 2020 22:08:18 -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 7214 invoked from network); 18 Nov 2020 22:08:17 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=sender:date:in-reply-to:message-id:mime-version:references:subject :from:to:cc; bh=sjtbZ3xOlxTCeGDsc49y7blbydcHA97ATmZyW4gNXi8=; b=bQOrgmvmWPVazHRiU7Sq4QuzywMs/XRdYpwqWAsr3kHc03SbDyK5DTQWLtd8FK91y3 MW3u4WbsCuRU0vzooO+H4s9QpGHpW389VzEmQRcj4VcXdnUgwjt45eFo8ZBzXnE4fKeD r0bhLti12UpA9An41fbHwFUR8/vhwYOYVyPxJIh/IPwza3kbBFdHqpR6/KeizFCtTGWX 6/8rBV+yRiy2gN2o7bFZ9jXivGRW7HEGEIIsWwtKVPHuDHa6XLj84LP/w+Xd2MEQ2bks 50uwuy6B0tkC4/TW0Wy9OY8x1oFS6B2Qj3ExbMLuC+o5odwx/ZCNGDq1GT0ZZq/1Fcim a9Sg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=sjtbZ3xOlxTCeGDsc49y7blbydcHA97ATmZyW4gNXi8=; b=jyoU00v3ZKUfmT6vBZqUSMGrE4klz8dAfhMQPXcl/nyAYMHz4IipS+AK1KdfSkAXZy MtObhdCx87kUb7f/QKTte67r4zoQfngYZks6D03VWQKMzz3eIlUD3+SU+cqwJLTyS5WV Xpopy1Vo25MqLkNxyzgNeiKUNJcYRLoY1Ij9tjEsmLeDrtfklbKF5VLV99EajRos1/tX hd8Wj0wlmd65omXq9PEdFp+HQg7Y+HJyeuqHnFcLdAzlN3ptxg+pB9SvUZb0ylCp6hC+ Hycbe6mxEXHVpi4Px5PPFm2xXUwQfI1bI3k+Mp0gTNCrC316hurbHusadQLmLpN0tRN1 izuQ== X-Gm-Message-State: AOAM531TpWkntlaIwBHrRCsaZWGO1bfN0KaSNd9vYM7Ci8suy4zHugcv Zxtr3E7NjuXbnpA8DRwV/xTtVzVeQn1RAjQ8zDw= X-Google-Smtp-Source: ABdhPJwxDtudTv+lhKifrPzdR3GIyaaL24pwI7bpI9IrG2vb633hmg0Jt18S95SjawSbFeAc/hQylLYmz77E0BMzIoQ= Sender: "samitolvanen via sendgmr" X-Received: from samitolvanen1.mtv.corp.google.com ([2620:15c:201:2:f693:9fff:fef4:1b6d]) (user=samitolvanen job=sendgmr) by 2002:a05:6214:c8e:: with SMTP id r14mr7292366qvr.21.1605737285331; Wed, 18 Nov 2020 14:08:05 -0800 (PST) Date: Wed, 18 Nov 2020 14:07:28 -0800 In-Reply-To: <20201118220731.925424-1-samitolvanen@google.com> Message-Id: <20201118220731.925424-15-samitolvanen@google.com> Mime-Version: 1.0 References: <20201118220731.925424-1-samitolvanen@google.com> X-Mailer: git-send-email 2.29.2.454.gaff20da3a2-goog Subject: [PATCH v7 14/17] arm64: vdso: disable LTO From: Sami Tolvanen To: Masahiro Yamada , Steven Rostedt , Will Deacon Cc: Josh Poimboeuf , Peter Zijlstra , Greg Kroah-Hartman , "Paul E. McKenney" , Kees Cook , Nick Desaulniers , clang-built-linux@googlegroups.com, kernel-hardening@lists.openwall.com, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, Sami Tolvanen Disable LTO for the vDSO by filtering out CC_FLAGS_LTO, as there's no point in using link-time optimization for the small about of C code. Signed-off-by: Sami Tolvanen Reviewed-by: Kees Cook Acked-by: Will Deacon --- arch/arm64/kernel/vdso/Makefile | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/arm64/kernel/vdso/Makefile b/arch/arm64/kernel/vdso/Makefile index d65f52264aba..50fe49fb4d95 100644 --- a/arch/arm64/kernel/vdso/Makefile +++ b/arch/arm64/kernel/vdso/Makefile @@ -30,7 +30,8 @@ ldflags-y := -shared -nostdlib -soname=linux-vdso.so.1 --hash-style=sysv \ ccflags-y := -fno-common -fno-builtin -fno-stack-protector -ffixed-x18 ccflags-y += -DDISABLE_BRANCH_PROFILING -CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) -Os $(CC_FLAGS_SCS) $(GCC_PLUGINS_CFLAGS) +CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) -Os $(CC_FLAGS_SCS) $(GCC_PLUGINS_CFLAGS) \ + $(CC_FLAGS_LTO) KASAN_SANITIZE := n UBSAN_SANITIZE := n OBJECT_FILES_NON_STANDARD := y