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BACKPORT: FROMGIT: kbuild: mkcompile_h: Include $LD version in /proc/version

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When doing Clang builds of the kernel, it is possible to link with
either ld.bfd (binutils) or ld.lld (LLVM), but it is not possible to
discover this from a running kernel. Add the "$LD -v" output to
/proc/version.

Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Tested-by: Nathan Chancellor <natechancellor@gmail.com>
Reviewed-by: Fangrui Song <maskray@google.com>
Reviewed-by: Sedat Dilek <sedat.dilek@gmail.com>
Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

Bug: 153484457
(cherry picked from commit 6f04f056df3c
 https://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild.git
 for-next)
[nd: commit 4b950bb9ac0c ("Kbuild: Handle PREEMPT_RT for version string and magic")
     missing in 4.19, first landed in 5.4-rc1.
     commit b79c6aa6a1f1 ("kbuild: remove unnecessary in-subshell execution")
     missing in 4.19, first landed in 5.1-rc1.
]
Change-Id: Ifa5a98fe159392862e8d07a733c0f141fa9c7715
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
This commit is contained in:
Kees Cook
2020-04-02 01:18:37 -07:00
committed by Alistair Delva
parent 0548ed6756
commit dba8725f4c
2 changed files with 8 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
init/Makefile
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@@ -33,5 +33,6 @@ $(obj)/version.o: include/generated/compile.h
silent_chk_compile.h = :
include/generated/compile.h: FORCE
@$($(quiet)chk_compile.h)
$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkcompile_h $@ \
"$(UTS_MACHINE)" "$(CONFIG_SMP)" "$(CONFIG_PREEMPT)" "$(CC) $(KBUILD_CFLAGS)"
$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkcompile_h $@ \
"$(UTS_MACHINE)" "$(CONFIG_SMP)" "$(CONFIG_PREEMPT)" \
"$(CC) $(KBUILD_CFLAGS)" "$(LD)"