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bh=JHNK5VWD3ddVakk1msJzGMuIHjr7wcpFWGy1F5g4J2Y=; b=qQ0hneCDXIfeF3IuEk+CDZrh9IkUj5BQX/S0tnWGvRajSK4aV4GV2ZyciwRt+sEOIs 7krHim/Wsjt66IckXxDa3TgbT6selFc0QBg3PQib1PcGypywONuSG2xD95FgGuFgXtyV 3OQsEAT8rWJ8rXJo6gmTmtLjT7myog4W3A677dDPfgYR6u/YkAenme8x/yQiG83ifNOS DmU2FBG/Vp3jhPIQNyuiKOluVHA+VbGIb0IKXSHHccMBPzwdBhnxh39rrktmlPVMAVzo BK6ojKcEtkgoYlh3LETbSMO4ehInXIMjngXOM4ID9Khx4+GRtFJstBwxdTScRJ1bIxDM Sf6A== X-Gm-Message-State: AOAM531Uwcs4WW5lygnfrJiB9Ay34jXRgbj3tqh4Ltp2JCeBYj1xZSbi 9wITQZl/OThOo0oRm+OWQZyY/SzZHgzdBJxURXk= X-Google-Smtp-Source: ABdhPJyNU5RpFXb6oDaPa5kfxyMLH3rqIIuf9in4Eo1ivOzj/QSIy554fzdbu1UoaF9jnvjswSLNZfW1sHDa3cxCuBM= X-Received: from samitolvanen1.mtv.corp.google.com ([2620:15c:201:2:f693:9fff:fef4:1b6d]) (user=samitolvanen job=sendgmr) by 2002:a62:7a53:0:b029:152:5482:8935 with SMTP id v80-20020a627a530000b029015254828935mr13281502pfc.31.1602260064759; Fri, 09 Oct 2020 09:14:24 -0700 (PDT) Date: Fri, 9 Oct 2020 09:13:31 -0700 In-Reply-To: <20201009161338.657380-1-samitolvanen@google.com> Message-Id: <20201009161338.657380-23-samitolvanen@google.com> Mime-Version: 1.0 References: <20201009161338.657380-1-samitolvanen@google.com> X-Mailer: git-send-email 2.28.0.1011.ga647a8990f-goog Subject: [PATCH v5 22/29] arm64: vdso: disable LTO From: Sami Tolvanen To: Masahiro Yamada , Will Deacon , Steven Rostedt X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201009_171432_140494_BC0E47DC X-CRM114-Status: GOOD ( 11.28 ) X-Spam-Score: -9.6 (---------) X-Spam-Report: SpamAssassin version 3.4.4 on casper.infradead.org summary: Content analysis details: (-9.6 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [2607:f8b0:4864:20:0:0:0:549 listed in] [list.dnswl.org] -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -7.5 USER_IN_DEF_DKIM_WL From: address is in the default DKIM white-list -0.0 SPF_PASS SPF: sender matches SPF record 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain -0.0 DKIMWL_WL_MED DKIMwl.org - Medium trust sender X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arch@vger.kernel.org, x86@kernel.org, Kees Cook , "Paul E. McKenney" , kernel-hardening@lists.openwall.com, Peter Zijlstra , Greg Kroah-Hartman , linux-kbuild@vger.kernel.org, Nick Desaulniers , linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com, Sami Tolvanen , linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org 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 --- 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 e836e300440f..aa47070a3ccf 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