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Kees Cook 4dcc9a8844 kbuild: mkcompile_h: Include $LD version in /proc/version

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>

2020-04-09 00:13:45 +09:00

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#!/bin/sh

SPDX-License-Identifier: GPL-2.0

TARGET=$1 ARCH=$2 SMP=$3 PREEMPT=$4 PREEMPT_RT=$5 CC=$6 LD=$7

vecho() { [ "${quiet}" = "silent_" ] || echo "$@" ; }

Do not expand names

set -f

Fix the language to get consistent output

LC_ALL=C export LC_ALL

if [ -z "$KBUILD_BUILD_VERSION" ]; then VERSION=$(cat .version 2>/dev/null || echo 1) else VERSION=$KBUILD_BUILD_VERSION fi

if [ -z "$KBUILD_BUILD_TIMESTAMP" ]; then TIMESTAMP=date else TIMESTAMP=$KBUILD_BUILD_TIMESTAMP fi if test -z "$KBUILD_BUILD_USER"; then LINUX_COMPILE_BY=$(whoami | sed 's/\/\\/') else LINUX_COMPILE_BY=$KBUILD_BUILD_USER fi if test -z "$KBUILD_BUILD_HOST"; then LINUX_COMPILE_HOST=hostname else LINUX_COMPILE_HOST=$KBUILD_BUILD_HOST fi

UTS_VERSION="#$VERSION" CONFIG_FLAGS="" if [ -n "$SMP" ] ; then CONFIG_FLAGS="SMP"; fi if [ -n "$PREEMPT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT"; fi if [ -n "$PREEMPT_RT" ] ; then CONFIG_FLAGS="$CONFIG_FLAGS PREEMPT_RT"; fi

Truncate to maximum length

UTS_LEN=64 UTS_VERSION="$(echo $UTS_VERSION $CONFIG_FLAGS $TIMESTAMP | cut -b -$UTS_LEN)"

Generate a temporary compile.h

{ echo /* This file is auto generated, version $VERSION */ if [ -n "$CONFIG_FLAGS" ] ; then echo "/* $CONFIG_FLAGS */"; fi

echo #define UTS_MACHINE "$ARCH"

echo #define UTS_VERSION "$UTS_VERSION"

printf '#define LINUX_COMPILE_BY "%s"\n' "$LINUX_COMPILE_BY" echo #define LINUX_COMPILE_HOST "$LINUX_COMPILE_HOST"

CC_VERSION=$($CC -v 2>&1 | grep ' version ' | sed 's/:space:$//') LD_VERSION=$($LD -v | head -n1 | sed 's/(compatible with [^)])//'
| sed 's/:space:*$//') printf '#define LINUX_COMPILER "%s"\n' "$CC_VERSION, $LD_VERSION" } > .tmpcompile

Only replace the real compile.h if the new one is different,

in order to preserve the timestamp and avoid unnecessary

recompilations.

We don't consider the file changed if only the date/time changed.

A kernel config change will increase the generation number, thus

causing compile.h to be updated (including date/time) due to the

changed comment in the

first line.

if [ -r $TARGET ] &&
grep -v 'UTS_VERSION' $TARGET > .tmpver.1 &&
grep -v 'UTS_VERSION' .tmpcompile > .tmpver.2 &&
cmp -s .tmpver.1 .tmpver.2; then rm -f .tmpcompile else vecho " UPD $TARGET" mv -f .tmpcompile $TARGET fi rm -f .tmpver.1 .tmpver.2

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