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From: Sami Tolvanen <samitolvanen@google.com>
To: x86@kernel.org
Cc: Kees Cook <keescook@chromium.org>,
	Josh Poimboeuf <jpoimboe@redhat.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Nathan Chancellor <nathan@kernel.org>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Sedat Dilek <sedat.dilek@gmail.com>,
	linux-hardening@vger.kernel.org, linux-kernel@vger.kernel.org,
	clang-built-linux@googlegroups.com,
	Sami Tolvanen <samitolvanen@google.com>
Subject: [PATCH 13/15] x86, cpu: Use LTO for cpu.c with CFI
Date: Fri, 16 Apr 2021 13:38:42 -0700	[thread overview]
Message-ID: <20210416203844.3803177-14-samitolvanen@google.com> (raw)
In-Reply-To: <20210416203844.3803177-1-samitolvanen@google.com>

Allow LTO to be used for cpu.c when CONFIG_CFI_CLANG is enabled to avoid
indirect call failures. CFI requires Clang >= 12, which doesn't have the
stack protector inlining bug.

Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
---
 arch/x86/power/Makefile | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/power/Makefile b/arch/x86/power/Makefile
index 379777572bc9..a0532851fed7 100644
--- a/arch/x86/power/Makefile
+++ b/arch/x86/power/Makefile
@@ -4,9 +4,11 @@
 # itself be stack-protected
 CFLAGS_cpu.o	:= -fno-stack-protector
 
+ifndef CONFIG_CFI_CLANG
 # Clang may incorrectly inline functions with stack protector enabled into
 # __restore_processor_state(): https://bugs.llvm.org/show_bug.cgi?id=47479
 CFLAGS_REMOVE_cpu.o := $(CC_FLAGS_LTO)
+endif
 
 obj-$(CONFIG_PM_SLEEP)		+= cpu.o
 obj-$(CONFIG_HIBERNATION)	+= hibernate_$(BITS).o hibernate_asm_$(BITS).o hibernate.o
-- 
2.31.1.368.gbe11c130af-goog


  parent reply	other threads:[~2021-04-16 20:39 UTC|newest]

Thread overview: 59+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-16 20:38 [PATCH 00/15] x86: Add support for Clang CFI Sami Tolvanen
2021-04-16 20:38 ` [PATCH 01/15] objtool: Find a destination for jumps beyond the section end Sami Tolvanen
2021-04-20 18:14   ` Josh Poimboeuf
2021-04-20 20:25     ` Sami Tolvanen
2021-04-20 22:55       ` Josh Poimboeuf
2021-04-20 22:58         ` Nick Desaulniers
2021-04-16 20:38 ` [PATCH 02/15] objtool: Add CONFIG_CFI_CLANG support Sami Tolvanen
2021-04-20 19:47   ` Josh Poimboeuf
2021-04-20 20:45     ` Sami Tolvanen
2021-04-16 20:38 ` [PATCH 03/15] objtool: Add ASM_STACK_FRAME_NON_STANDARD Sami Tolvanen
2021-04-16 20:38 ` [PATCH 04/15] static_call: Use global functions for the self-test Sami Tolvanen
2021-04-16 21:37   ` Thomas Gleixner
2021-04-17  0:16     ` Thomas Gleixner
2021-04-16 20:38 ` [PATCH 05/15] x86: Implement function_nocfi Sami Tolvanen
2021-04-16 21:18   ` Borislav Petkov
2021-04-16 21:49     ` Sami Tolvanen
2021-04-16 22:02       ` Borislav Petkov
2021-04-16 22:06         ` Andy Lutomirski
2021-04-16 22:14           ` Borislav Petkov
2021-04-16 22:20             ` Andy Lutomirski
2021-04-16 22:37               ` Kees Cook
2021-04-16 23:02                 ` Thomas Gleixner
2021-04-17 10:16                   ` Thomas Gleixner
2021-04-19 15:13                     ` Sami Tolvanen
2021-04-16 22:28           ` Kees Cook
2021-04-16 22:52             ` Andy Lutomirski
2021-04-16 22:58               ` Kees Cook
2021-04-16 23:40               ` Kees Cook
2021-04-17 23:19                 ` Andy Lutomirski
2021-04-17 23:53                   ` Thomas Gleixner
2021-04-18  0:11                     ` Andy Lutomirski
2021-04-18 16:17                       ` Thomas Gleixner
2021-04-18 22:57                         ` Andy Lutomirski
2021-04-19 15:20                           ` Sami Tolvanen
2021-04-19 15:26                       ` David Laight
2021-04-19 17:46                         ` Andy Lutomirski
2021-04-17 14:20             ` David Laight
2021-04-17 15:48               ` Andy Lutomirski
2021-04-19  8:40             ` Rasmus Villemoes
2021-04-19 16:45               ` Joao Moreira
2021-04-19 21:52               ` David Laight
2021-04-16 22:16         ` Kees Cook
2021-04-16 22:13       ` Thomas Gleixner
2021-04-16 20:38 ` [PATCH 06/15] x86: Avoid CFI jump tables in IDT and entry points Sami Tolvanen
2021-04-16 22:26   ` Thomas Gleixner
2021-04-16 23:56     ` Kees Cook
2021-04-17  0:02       ` Thomas Gleixner
2021-04-16 20:38 ` [PATCH 07/15] x86/ftrace: Use function_nocfi in MCOUNT_ADDR Sami Tolvanen
2021-04-16 20:38 ` [PATCH 08/15] x86/extable: Do not mark exception callback as CFI Sami Tolvanen
2021-04-16 20:38 ` [PATCH 09/15] x86/alternatives: Use C int3 selftest but disable KASAN Sami Tolvanen
2021-04-17 11:37   ` Peter Zijlstra
2021-04-19 15:26     ` Sami Tolvanen
2021-04-20  7:19       ` Peter Zijlstra
2021-04-16 20:38 ` [PATCH 10/15] x86/purgatory: Disable CFI Sami Tolvanen
2021-04-16 20:38 ` [PATCH 11/15] x86, relocs: Ignore __typeid__ relocations Sami Tolvanen
2021-04-16 20:38 ` [PATCH 12/15] x86, module: " Sami Tolvanen
2021-04-16 20:38 ` Sami Tolvanen [this message]
2021-04-16 20:38 ` [PATCH 14/15] x86, kprobes: Fix optprobe_template_func type mismatch Sami Tolvanen
2021-04-16 20:38 ` [PATCH 15/15] x86, build: Allow CONFIG_CFI_CLANG to be selected Sami Tolvanen

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