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 v2 12/14] x86, cpu: Use LTO for cpu.c with CFI
Date: Mon, 23 Aug 2021 10:13:16 -0700 [thread overview]
Message-ID: <20210823171318.2801096-13-samitolvanen@google.com> (raw)
In-Reply-To: <20210823171318.2801096-1-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
--
2.33.0.rc2.250.ged5fa647cd-goog
next prev parent reply other threads:[~2021-08-23 17:14 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-23 17:13 [PATCH v2 00/14] x86: Add support for Clang CFI Sami Tolvanen
2021-08-23 17:13 ` [PATCH v2 01/14] objtool: Add CONFIG_CFI_CLANG support Sami Tolvanen
2021-08-23 17:13 ` [PATCH v2 02/14] objtool: Add ASM_STACK_FRAME_NON_STANDARD Sami Tolvanen
2021-08-23 17:13 ` [PATCH v2 03/14] linkage: Add DECLARE_ASM_FUNC_SYMBOL Sami Tolvanen
2021-08-23 17:13 ` [PATCH v2 04/14] ftrace: Use an opaque type for functions not callable from C Sami Tolvanen
2021-08-23 17:13 ` [PATCH v2 05/14] lkdtm: Disable UNSET_SMEP with CFI Sami Tolvanen
2021-08-23 17:13 ` [PATCH v2 06/14] lkdtm: Use an opaque type for lkdtm_rodata_do_nothing Sami Tolvanen
2021-08-23 17:13 ` [PATCH v2 07/14] x86: Use an opaque type for functions not callable from C Sami Tolvanen
2021-08-26 16:54 ` Andy Lutomirski
2021-08-26 22:11 ` Sami Tolvanen
2021-08-26 23:23 ` Andy Lutomirski
2021-08-26 23:45 ` Sami Tolvanen
2021-08-23 17:13 ` [PATCH v2 08/14] x86/extable: Do not mark exception callback as CFI Sami Tolvanen
2021-08-26 16:56 ` Andy Lutomirski
2021-08-30 19:57 ` Sami Tolvanen
2021-08-23 17:13 ` [PATCH v2 09/14] x86/purgatory: Disable CFI Sami Tolvanen
2021-08-23 17:13 ` [PATCH v2 10/14] x86, relocs: Ignore __typeid__ relocations Sami Tolvanen
2021-08-23 17:13 ` [PATCH v2 11/14] x86, module: " Sami Tolvanen
2021-08-23 17:13 ` Sami Tolvanen [this message]
2021-08-23 17:13 ` [PATCH v2 13/14] x86, kprobes: Fix optprobe_template_func type mismatch Sami Tolvanen
2021-08-23 17:13 ` [PATCH v2 14/14] x86, build: Allow CONFIG_CFI_CLANG to be selected Sami Tolvanen
2021-08-23 17:16 ` [PATCH v2 00/14] x86: Add support for Clang CFI Tom Stellard
2021-08-23 17:20 ` Sami Tolvanen
2021-08-24 17:26 ` Tom Stellard
2021-08-24 17:30 ` Sami Tolvanen
2021-08-24 19:46 ` Peter Zijlstra
2021-08-25 15:49 ` Sami Tolvanen
2021-08-26 11:43 ` Peter Zijlstra
2021-08-26 21:52 ` Sami Tolvanen
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