From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga11.intel.com ([192.55.52.93]:13768 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390535AbeIUU7s (ORCPT ); Fri, 21 Sep 2018 16:59:48 -0400 From: Yu-cheng Yu Subject: [RFC PATCH v4 8/9] x86: Insert endbr32/endbr64 to vDSO Date: Fri, 21 Sep 2018 08:05:52 -0700 Message-ID: <20180921150553.21016-9-yu-cheng.yu@intel.com> In-Reply-To: <20180921150553.21016-1-yu-cheng.yu@intel.com> References: <20180921150553.21016-1-yu-cheng.yu@intel.com> Sender: linux-arch-owner@vger.kernel.org List-ID: To: x86@kernel.org, "H. Peter Anvin" , Thomas Gleixner , Ingo Molnar , linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-api@vger.kernel.org, Arnd Bergmann , Andy Lutomirski , Balbir Singh , Cyrill Gorcunov , Dave Hansen , Florian Weimer , "H.J. Lu" , Jann Horn , Jonathan Corbet , Kees Cook , Mike Kravetz , Nadav Amit , Oleg Nesterov , Pavel Machek , Peter Zijlstra , Randy Dunlap , "Ravi V. Shankar" , Vedvyas Shanbhogue Message-ID: <20180921150552.TO_dOAU93rbloXqSWKaKZ0hrg9tjk2wxVrqRrL64fqg@z> From: "H.J. Lu" When Intel indirect branch tracking is enabled, functions in vDSO which may be called indirectly must have endbr32 or endbr64 as the first instruction. Compiler must support -fcf-protection=branch so that it can be used to compile vDSO. Signed-off-by: H.J. Lu --- arch/x86/entry/vdso/.gitignore | 4 ++++ arch/x86/entry/vdso/Makefile | 12 +++++++++++- arch/x86/entry/vdso/vdso-layout.lds.S | 1 + 3 files changed, 16 insertions(+), 1 deletion(-) diff --git a/arch/x86/entry/vdso/.gitignore b/arch/x86/entry/vdso/.gitignore index aae8ffdd5880..552941fdfae0 100644 --- a/arch/x86/entry/vdso/.gitignore +++ b/arch/x86/entry/vdso/.gitignore @@ -5,3 +5,7 @@ vdso32-sysenter-syms.lds vdso32-int80-syms.lds vdso-image-*.c vdso2c +vclock_gettime.S +vgetcpu.S +vclock_gettime.asm +vgetcpu.asm diff --git a/arch/x86/entry/vdso/Makefile b/arch/x86/entry/vdso/Makefile index fa3f439f0a92..8694f70c08e6 100644 --- a/arch/x86/entry/vdso/Makefile +++ b/arch/x86/entry/vdso/Makefile @@ -102,13 +102,17 @@ vobjx32s := $(foreach F,$(vobjx32s-y),$(obj)/$F) # Convert 64bit object file to x32 for x32 vDSO. quiet_cmd_x32 = X32 $@ - cmd_x32 = $(OBJCOPY) -O elf32-x86-64 $< $@ + cmd_x32 = $(OBJCOPY) -R .note.gnu.property -O elf32-x86-64 $< $@ $(obj)/%-x32.o: $(obj)/%.o FORCE $(call if_changed,x32) targets += vdsox32.lds $(vobjx32s-y) +ifdef CONFIG_X86_INTEL_BRANCH_TRACKING_USER + $(obj)/vclock_gettime.o $(obj)/vgetcpu.o $(obj)/vdso32/vclock_gettime.o: KBUILD_CFLAGS += -fcf-protection=branch +endif + $(obj)/%.so: OBJCOPYFLAGS := -S $(obj)/%.so: $(obj)/%.so.dbg $(call if_changed,objcopy) @@ -160,6 +164,12 @@ quiet_cmd_vdso = VDSO $@ VDSO_LDFLAGS = -shared $(call ld-option, --hash-style=both) \ $(call ld-option, --build-id) -Bsymbolic +ifdef CONFIG_X86_INTEL_BRANCH_TRACKING_USER + VDSO_LDFLAGS += $(call ldoption, -z$(comma)ibt) +endif +ifdef CONFIG_X86_INTEL_SHADOW_STACK_USER + VDSO_LDFLAGS += $(call ldoption, -z$(comma)shstk) +endif GCOV_PROFILE := n # diff --git a/arch/x86/entry/vdso/vdso-layout.lds.S b/arch/x86/entry/vdso/vdso-layout.lds.S index acfd5ba7d943..cabaeedfed78 100644 --- a/arch/x86/entry/vdso/vdso-layout.lds.S +++ b/arch/x86/entry/vdso/vdso-layout.lds.S @@ -74,6 +74,7 @@ SECTIONS .fake_shstrtab : { *(.fake_shstrtab) } :text + .note.gnu.property : { *(.note.gnu.property) } :text :note .note : { *(.note.*) } :text :note .eh_frame_hdr : { *(.eh_frame_hdr) } :text :eh_frame_hdr -- 2.17.1