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bh=iN3GbBjTX25viV6xW68a9oo3MkQJYWkKKPfs1TkAluY=; b=UqS52eSiwB6vDpeQPz2GAzRyT965j4CbR6iTVv/2wktLJYRISX/71Ydl/GFjw6UBHa MJmlHrRcC2HlTZDRz5AiZQzUZQk23JaArSuNkJ7BiiVsBt2NsSj+gzwm8C44URkcLqp7 x5aFXunHpJ9Oe+jKJL9U1T7T6fRghrS47CgVwatRACNgbaXSWQJG51aPDQhGN9kzgj4T bB2iCfAY/3wTjivUnDoXlR4f23YR9Afeg2pthYq+MUAMgm/+76+XRyP/ysb/gGkVkSo2 ZwXCGKZ4vQFWkIXNlClkjKtu6lsLVNXNtBiMKTzAcYO+vzNe5I2xGP7lyq2uaSg3c1Ms HrNA== X-Gm-Message-State: AOAM533acG/cSF3sEN8ylNC1eptg/k+6e4UubsTFncTNnQLKMxjant66 GWBi4LbVPLu7tiSWxtgzZEO3E+CmDVlOlQDPa8E= X-Google-Smtp-Source: ABdhPJyiG0zEVlMgXVpb6Zi8eshehY9Qj0OKZzrDehRr0ot1IUkMHErjz4cB8zqJtzXVoh7q4DtUcBhjwy1qLdSHusA= X-Received: from samitolvanen1.mtv.corp.google.com ([2620:15c:201:2:f693:9fff:fef4:1b6d]) (user=samitolvanen job=sendgmr) by 2002:a25:1455:: with SMTP id 82mr5771395ybu.274.1599165096721; Thu, 03 Sep 2020 13:31:36 -0700 (PDT) Date: Thu, 3 Sep 2020 13:30:45 -0700 In-Reply-To: <20200903203053.3411268-1-samitolvanen@google.com> Message-Id: <20200903203053.3411268-21-samitolvanen@google.com> Mime-Version: 1.0 References: <20200624203200.78870-1-samitolvanen@google.com> <20200903203053.3411268-1-samitolvanen@google.com> X-Mailer: git-send-email 2.28.0.526.ge36021eeef-goog Subject: [PATCH v2 20/28] efi/libstub: disable LTO From: Sami Tolvanen To: Masahiro Yamada , Will Deacon X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200903_213139_529759_F9357727 X-CRM114-Status: GOOD ( 11.53 ) X-Spam-Score: -10.1 (----------) X-Spam-Report: SpamAssassin version 3.4.4 on casper.infradead.org summary: Content analysis details: (-10.1 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:b4a listed in] [list.dnswl.org] -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] -0.0 SPF_PASS SPF: sender matches SPF record -7.5 USER_IN_DEF_DKIM_WL From: address is in the default DKIM white-list 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -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 0.1 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 -0.5 DKIMWL_WL_MED DKIMwl.org - Medium 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, Steven Rostedt , 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 With CONFIG_LTO_CLANG, we produce LLVM bitcode instead of ELF object files. Since LTO is not really needed here and the Makefile assumes we produce an object file, disable LTO for libstub. Signed-off-by: Sami Tolvanen Reviewed-by: Kees Cook --- drivers/firmware/efi/libstub/Makefile | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/firmware/efi/libstub/Makefile b/drivers/firmware/efi/libstub/Makefile index 296b18fbd7a2..0ea5aa52c7fa 100644 --- a/drivers/firmware/efi/libstub/Makefile +++ b/drivers/firmware/efi/libstub/Makefile @@ -35,6 +35,8 @@ KBUILD_CFLAGS := $(cflags-y) -Os -DDISABLE_BRANCH_PROFILING \ # remove SCS flags from all objects in this directory KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_SCS), $(KBUILD_CFLAGS)) +# disable LTO +KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_LTO), $(KBUILD_CFLAGS)) GCOV_PROFILE := n # Sanitizer runtimes are unavailable and cannot be linked here.