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Clang feature fixes for v5.13-rc4

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- Correctly pass stack frame size checking under LTO (Nick Desaulniers)
 
 - Avoid CFI mismatches by checking initcall_t types (Marco Elver)
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Merge tag 'clang-features-v5.13-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

Pull clang feature fixes from Kees Cook:

 - Correctly pass stack frame size checking under LTO (Nick Desaulniers)

 - Avoid CFI mismatches by checking initcall_t types (Marco Elver)

* tag 'clang-features-v5.13-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  Makefile: LTO: have linker check -Wframe-larger-than
  init: verify that function is initcall_t at compile-time
This commit is contained in:
Linus Torvalds 2021-05-28 08:31:48 -10:00
commit 8508b97ae2
2 changed files with 7 additions and 1 deletions
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5
Makefile
View File

@ -928,6 +928,11 @@ CC_FLAGS_LTO += -fvisibility=hidden
# Limit inlining across translation units to reduce binary size
KBUILD_LDFLAGS += -mllvm -import-instr-limit=5
# Check for frame size exceeding threshold during prolog/epilog insertion.
ifneq ($(CONFIG_FRAME_WARN),0)
KBUILD_LDFLAGS += -plugin-opt=-warn-stack-size=$(CONFIG_FRAME_WARN)
endif
endif
ifdef CONFIG_LTO

3
include/linux/init.h
View File

@ -242,7 +242,8 @@ extern bool initcall_debug;
asm(".section \"" __sec "\", \"a\" \n" \
__stringify(__name) ": \n" \
".long " __stringify(__stub) " - . \n" \
".previous \n");
".previous \n"); \
static_assert(__same_type(initcall_t, &fn));
#else
#define ____define_initcall(fn, __unused, __name, __sec) \
static initcall_t __name __used \