Commit 7c21383f authored by Kees Cook's avatar Kees Cook Committed by Borislav Petkov

x86/build: Keep local relocations with ld.lld

The LLVM linker (ld.lld) defaults to removing local relocations, which
causes KASLR boot failures. ld.bfd and ld.gold already handle this
correctly. This adds the explicit instruction "--discard-none" during
the link phase. There is no change in output for ld.bfd and ld.gold,
but ld.lld now produces an image with all the needed relocations.
Signed-off-by: default avatarKees Cook <keescook@chromium.org>
Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: clang-built-linux@googlegroups.com
Cc: x86-ml <x86@kernel.org>
Link: https://lkml.kernel.org/r/20190404214027.GA7324@beast
Link: https://github.com/ClangBuiltLinux/linux/issues/404
parent 79a3aaa7
...@@ -47,7 +47,7 @@ export REALMODE_CFLAGS ...@@ -47,7 +47,7 @@ export REALMODE_CFLAGS
export BITS export BITS
ifdef CONFIG_X86_NEED_RELOCS ifdef CONFIG_X86_NEED_RELOCS
LDFLAGS_vmlinux := --emit-relocs LDFLAGS_vmlinux := --emit-relocs --discard-none
endif endif
# #
......
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