wonderful-mobile/exynos-linux-stable
2
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

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

Browse source 
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 4.14, first landed in 5.4-rc1.
     commit b79c6aa6a1f1 ("kbuild: remove unnecessary in-subshell execution")
     missing in 4.14, first landed in 5.1-rc1.
]
Change-Id: Ifa5a98fe159392862e8d07a733c0f141fa9c7715
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Danny Lin <danny@kdrag0n.dev>
This commit is contained in:
Kees Cook 2020-04-02 01:18:37 -07:00 • committed by xxmustafacooTR
parent c178081cc5
commit 9c537aaffc
No known key found for this signature in database
GPG key ID: 520B6FE385CBF5C9
2 changed files with 11 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files

5
init/Makefile
View file

@ -37,5 +37,6 @@ $(obj)/version.o: include/generated/compile.h
silent_chk_compile.h = :
include/generated/compile.h: FORCE
@$($(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)"

11
scripts/mkcompile_h
View file

@ -5,6 +5,7 @@ ARCH=$2
SMP=$3
PREEMPT=$4
CC=$5
LD=$6
vecho() { [ "${quiet}" = "silent_" ] || echo "$@" ; }
@ -77,10 +78,14 @@ UTS_TRUNCATE="cut -b -$UTS_LEN"
echo \#define LINUX_COMPILE_HOST \"`echo $LINUX_COMPILE_HOST | $UTS_TRUNCATE`\"
if [ -z "$KBUILD_COMPILER_STRING" ]; then
echo \#define LINUX_COMPILER \"`$CC -v 2>&1 | grep ' version ' | sed 's/[[:space:]]*$//'`\"
CC_VERSION=$($CC -v 2>&1 | grep ' version ' | sed 's/[[:space:]]*$//')
else
echo \#define LINUX_COMPILER \"$KBUILD_COMPILER_STRING\"
fi;
CC_VERSION="$KBUILD_COMPILER_STRING"
fi
LD_VERSION=$($LD -v | head -n1 | sed 's/(compatible with [^)]*)//' \
| sed 's/[[:space:]]*$//')
printf '#define LINUX_COMPILER "%s"\n' "$CC_VERSION, $LD_VERSION"
) > .tmpcompile
# Only replace the real compile.h if the new one is different,