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h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=gthp3Bj0P2AIZDnyPvPDLU5BmlPwq0tkbebnzUDYhbZ0quFE3mS9Z/hCEbP3Jrf2d 1ojun3a306we9Zrn0f+yEuJpDwK+34DhKew3o5il85jQq7pSHjUqMYpifqfIEjdkdy aAj/nbJuv87EDF+XUXrCXPNOZkU8t61CGDRfLoVoyVwn3tixuPgkccLwps5aS0zD8T OXeeuMQi/9wPPbYv/CemMHHbqlY4U2jChy8Jyqmyte+8jJW+XV9fHMcdnkxTeqbuey VYSZQdtbHgw5rGxhGFfeD+vDfElwjG9DCeJ0UqdTyASQ3zi1uvuqkz6Dk7I0eiscKP tLXynFvQKvuHQ== From: Nathan Chancellor Date: Mon, 07 Oct 2024 21:22:03 -0700 Subject: [PATCH 1/3] powerpc: Fix stack protector Kconfig test for clang X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Post: List-Subscribe: , , List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241007-powerpc-fix-stackprotector-test-clang-v1-1-08c15b2694e4@kernel.org> References: <20241007-powerpc-fix-stackprotector-test-clang-v1-0-08c15b2694e4@kernel.org> In-Reply-To: <20241007-powerpc-fix-stackprotector-test-clang-v1-0-08c15b2694e4@kernel.org> To: Michael Ellerman Cc: Nicholas Piggin , Christophe Leroy , Naveen N Rao , Madhavan Srinivasan , Nick Desaulniers , Bill Wendling , Justin Stitt , Keith Packard , linuxppc-dev@lists.ozlabs.org, llvm@lists.linux.dev, patches@lists.linux.dev, Nathan Chancellor X-Mailer: b4 0.15-dev X-Developer-Signature: v=1; a=openpgp-sha256; l=2181; i=nathan@kernel.org; h=from:subject:message-id; bh=+wY/P7Mzm/p1v2vQEghvlVOqCHOLAZoABB4rJCcKJzw=; b=owGbwMvMwCUmm602sfCA1DTG02pJDOksm9ufuT3Z4dui5vaR+eQnZn6u/ilr5kbkLllTuyLWh VFi3bHDHaUsDGJcDLJiiizVj1WPGxrOOct449QkmDmsTCBDGLg4BWAiP/Yz/K9eZ7fa//CFlVr9 MWoKFcJGFyPOd6hHa836+1T7e9sPLhWG/+WVS96c/fgieYHAubu3dtsmP+R/12xSwrRK9LDBNJb 7z7gB X-Developer-Key: i=nathan@kernel.org; a=openpgp; fpr=2437CB76E544CB6AB3D9DFD399739260CB6CB716 X-Spam-Status: No, score=-0.3 required=5.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,SPF_HELO_NONE,SPF_PASS autolearn=disabled version=4.0.0 X-Spam-Checker-Version: SpamAssassin 4.0.0 (2022-12-13) on lists.ozlabs.org Clang's in-progress per-task stack protector support [1] does not work with the current Kconfig checks because '-mstack-protector-guard-offset' is not provided, unlike all other architecture Kconfig checks. $ fd Kconfig -x rg -l mstack-protector-guard-offset ./arch/arm/Kconfig ./arch/riscv/Kconfig ./arch/arm64/Kconfig This produces an error from clang, which is interpreted as the flags not being supported at all when they really are. $ clang --target=powerpc64-linux-gnu \ -mstack-protector-guard=tls \ -mstack-protector-guard-reg=r13 \ -c -o /dev/null -x c /dev/null clang: error: '-mstack-protector-guard=tls' is used without '-mstack-protector-guard-offset', and there is no default This argument will always be provided by the build system, so mirror other architectures and use '-mstack-protector-guard-offset=0' for testing support, which fixes the issue for clang and does not regress support with GCC. Link: https://github.com/llvm/llvm-project/pull/110928 [1] Signed-off-by: Nathan Chancellor --- arch/powerpc/Kconfig | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 8094a01974cca1d27002720e706f66bec2a2d035..eb98050b8c016bb23887a9d669d29e69d933c9c8 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -275,8 +275,8 @@ config PPC select HAVE_RSEQ select HAVE_SETUP_PER_CPU_AREA if PPC64 select HAVE_SOFTIRQ_ON_OWN_STACK - select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2) - select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13) + select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2 -mstack-protector-guard-offset=0) + select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13 -mstack-protector-guard-offset=0) select HAVE_STATIC_CALL if PPC32 select HAVE_SYSCALL_TRACEPOINTS select HAVE_VIRT_CPU_ACCOUNTING From patchwork Tue Oct 8 04:22:04 2024 Content-Type: text/plain; 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h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=Fgj7pJKtimCDmlvDt49Vq++mtqYmEG0QETyNzqgwVWrlPznHZLVLNcewsCCjigoAQ i2o1nlN7ZmN/do38C9SVxcErFNEYE6IIFFCLvP5bkjkpINwHiAQJtzs2TUCqcsjgfs me9TBp291n1J6pVoCvqcT/SY0evtCjeLWSDVgZIpg4ay3jg3T3T5Qhqp48716Vjk3W WonNEeVsdbW5i/JsiuDtOn4SuC6hinbvDvRsEwV4EE9Rg94awK6OyK3sYhis/bi5Wl mkvAIvvPOV/bCHnLCstiawrOb4iCV7JsHwPuL8RinrtKWqFH9/ddVOdw0d0nkN6wfY rNgoVftm09B6w== From: Nathan Chancellor Date: Mon, 07 Oct 2024 21:22:04 -0700 Subject: [PATCH 2/3] powerpc: Adjust adding stack protector flags to KBUILD_CLAGS for clang X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Post: List-Subscribe: , , List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241007-powerpc-fix-stackprotector-test-clang-v1-2-08c15b2694e4@kernel.org> References: <20241007-powerpc-fix-stackprotector-test-clang-v1-0-08c15b2694e4@kernel.org> In-Reply-To: <20241007-powerpc-fix-stackprotector-test-clang-v1-0-08c15b2694e4@kernel.org> To: Michael Ellerman Cc: Nicholas Piggin , Christophe Leroy , Naveen N Rao , Madhavan Srinivasan , Nick Desaulniers , Bill Wendling , Justin Stitt , Keith Packard , linuxppc-dev@lists.ozlabs.org, llvm@lists.linux.dev, patches@lists.linux.dev, Nathan Chancellor X-Mailer: b4 0.15-dev X-Developer-Signature: v=1; a=openpgp-sha256; l=2742; i=nathan@kernel.org; h=from:subject:message-id; bh=CQpN5id32lq/DGrce8Pbuy5QP+ZsBWS9RkPNDANX6pw=; b=owGbwMvMwCUmm602sfCA1DTG02pJDOksm9tfNopN8Alwn7wrreFtwtNGlX+XM+K/cOQn+vrbf lAvDb3ZUcrCIMbFICumyFL9WPW4oeGcs4w3Tk2CmcPKBDKEgYtTACayO5Hhn4bRwTNsT95yL/A1 mTj3sNDLlOkRln/F++1OaVWFvt7zXp+RYdti9qpJ9xZLLNPsX7kqMn9LQ9oPLfYPZm9ChPom1Mg nsgAA X-Developer-Key: i=nathan@kernel.org; a=openpgp; fpr=2437CB76E544CB6AB3D9DFD399739260CB6CB716 X-Spam-Status: No, score=-0.3 required=5.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,SPF_HELO_NONE,SPF_PASS autolearn=disabled version=4.0.0 X-Spam-Checker-Version: SpamAssassin 4.0.0 (2022-12-13) on lists.ozlabs.org After fixing the HAVE_STACKPROTECTER checks for clang's in-progress per-task stack protector support [1], the build fails during prepare0 because '-mstack-protector-guard-offset' has not been added to KBUILD_CFLAGS yet but the other '-mstack-protector-guard' flags have. clang: error: '-mstack-protector-guard=tls' is used without '-mstack-protector-guard-offset', and there is no default clang: error: '-mstack-protector-guard=tls' is used without '-mstack-protector-guard-offset', and there is no default make[4]: *** [scripts/Makefile.build:229: scripts/mod/empty.o] Error 1 make[4]: *** [scripts/Makefile.build:102: scripts/mod/devicetable-offsets.s] Error 1 Mirror other architectures and add all '-mstack-protector-guard' flags to KBUILD_CFLAGS atomically during stack_protector_prepare, which resolves the issue and allows clang's implementation to fully work with the kernel. Link: https://github.com/llvm/llvm-project/pull/110928 [1] Signed-off-by: Nathan Chancellor --- arch/powerpc/Makefile | 15 ++++++--------- 1 file changed, 6 insertions(+), 9 deletions(-) diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile index bbfe4a1f06ef9db9b2f2e48e02096b1e0500a14b..8f9e387c4c7dd06d8756dca3eac808cc344a937d 100644 --- a/arch/powerpc/Makefile +++ b/arch/powerpc/Makefile @@ -100,13 +100,6 @@ KBUILD_AFLAGS += -m$(BITS) KBUILD_LDFLAGS += -m elf$(BITS)$(LDEMULATION) endif -cflags-$(CONFIG_STACKPROTECTOR) += -mstack-protector-guard=tls -ifdef CONFIG_PPC64 -cflags-$(CONFIG_STACKPROTECTOR) += -mstack-protector-guard-reg=r13 -else -cflags-$(CONFIG_STACKPROTECTOR) += -mstack-protector-guard-reg=r2 -endif - LDFLAGS_vmlinux-y := -Bstatic LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) := -pie LDFLAGS_vmlinux-$(CONFIG_RELOCATABLE) += -z notext @@ -402,9 +395,13 @@ prepare: stack_protector_prepare PHONY += stack_protector_prepare stack_protector_prepare: prepare0 ifdef CONFIG_PPC64 - $(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "PACA_CANARY") print $$3;}' include/generated/asm-offsets.h)) + $(eval KBUILD_CFLAGS += -mstack-protector-guard=tls \ + -mstack-protector-guard-reg=r13 \ + -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "PACA_CANARY") print $$3;}' include/generated/asm-offsets.h)) else - $(eval KBUILD_CFLAGS += -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "TASK_CANARY") print $$3;}' include/generated/asm-offsets.h)) + $(eval KBUILD_CFLAGS += -mstack-protector-guard=tls \ + -mstack-protector-guard-reg=r2 \ + -mstack-protector-guard-offset=$(shell awk '{if ($$2 == "TASK_CANARY") print $$3;}' include/generated/asm-offsets.h)) endif endif From patchwork Tue Oct 8 04:22:05 2024 Content-Type: text/plain; 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a=openpgp-sha256; l=2034; i=nathan@kernel.org; h=from:subject:message-id; bh=bAbqiY32v7W3t8ENtyeNXoNDZoMAvxzj5ilcMrs030c=; b=owGbwMvMwCUmm602sfCA1DTG02pJDOksmzucbknsuGt+8vSkpw9S2TY0XJnaPEcpIde+44/In fK5QYyXO0pZGMS4GGTFFFmqH6seNzScc5bxxqlJMHNYmUCGMHBxCsBEgpwZGZ6muuw0WezcPZ9L 4eDcpKkP/Z/8mlBQdP7s3s2XK/Z9ZrrKyHBSxuZRVOVcpsAdYnrzpq90udaXoT8pq9th+pWNi/1 q3/MDAA== X-Developer-Key: i=nathan@kernel.org; a=openpgp; fpr=2437CB76E544CB6AB3D9DFD399739260CB6CB716 X-Spam-Status: No, score=-5.3 required=5.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_HI,SPF_HELO_NONE, SPF_PASS autolearn=disabled version=4.0.0 X-Spam-Checker-Version: SpamAssassin 4.0.0 (2022-12-13) on lists.ozlabs.org Kbuild uses the powerpc64le-linux-gnu target for clang, which causes the Kconfig check for 32-bit powerpc stack protector support to fail because nothing flips the target to 32-bit: $ clang --target=powerpc64le-linux-gnu \ -mstack-protector-guard=tls -mstack-protector-guard-reg=r2 \ -mstack-protector-guard-offset=0 \ -x c -c -o /dev/null /dev/null clang: error: invalid value 'r2' in 'mstack-protector-guard-reg=', expected one of: r13 Use the Kconfig macro '$(m32-flag)', which expands to '-m32' when supported, in the stack protector support cc-option call to properly switch the target to a 32-bit one, which matches what happens in Kbuild. While the 64-bit macro does not strictly need it, add the equivalent 64-bit option for symmetry. Signed-off-by: Nathan Chancellor --- arch/powerpc/Kconfig | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index eb98050b8c016bb23887a9d669d29e69d933c9c8..6aaca48955a34b2a38af1415bfa36f74f35c3f3e 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -275,8 +275,8 @@ config PPC select HAVE_RSEQ select HAVE_SETUP_PER_CPU_AREA if PPC64 select HAVE_SOFTIRQ_ON_OWN_STACK - select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r2 -mstack-protector-guard-offset=0) - select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,-mstack-protector-guard=tls -mstack-protector-guard-reg=r13 -mstack-protector-guard-offset=0) + select HAVE_STACKPROTECTOR if PPC32 && $(cc-option,$(m32-flag) -mstack-protector-guard=tls -mstack-protector-guard-reg=r2 -mstack-protector-guard-offset=0) + select HAVE_STACKPROTECTOR if PPC64 && $(cc-option,$(m64-flag) -mstack-protector-guard=tls -mstack-protector-guard-reg=r13 -mstack-protector-guard-offset=0) select HAVE_STATIC_CALL if PPC32 select HAVE_SYSCALL_TRACEPOINTS select HAVE_VIRT_CPU_ACCOUNTING