linux-kernel - Re: [PATCH] kbuild: mkcompile_h: Include $LD version in /proc/version

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Message-ID: <CA+icZUV1wy6QFzQJFghBpvAphMnZ1DGhYrmrryfZ7vkXfPc3vw@mail.gmail.com>
Date:   Mon, 6 Apr 2020 19:13:22 +0200
From:   Sedat Dilek <sedat.dilek@...il.com>
To:     Kees Cook <keescook@...omium.org>
Cc:     Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Clang-Built-Linux ML <clang-built-linux@...glegroups.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] kbuild: mkcompile_h: Include $LD version in /proc/version

On Mon, Apr 6, 2020 at 5:53 PM Kees Cook <keescook@...omium.org> wrote:
[ ... ]
> > How to test scripts/mkcompile_h?
>
> There's probably a better way, but I do:
>
> $ rm include/generated/compile.h init/version.o
> $ make init/version.o
> $ cat include/generated/compile.h
>

Thanks Kees.

# Clean-up
make distclean

# Prereq: Generate include/generated/autoconf.h file
cp -v /boot/config-5.6.0-2-amd64-clang .config
MAKE="make V=1" ; COMPILER="mycompiler" ; LINKER="mylinker" ;
MAKE_OPTS="CC=$COMPILER HOSTCC=$COMPILER LD=$LINKER HOSTLD=$LINKER"
yes "" | $MAKE $MAKE_OPTS oldconfig && $MAKE $MAKE_OPTS syncconfig < /dev/null

# Generate include/generated/compile.h file
$MAKE $MAKE_OPTS init/version.o

cat include/generated/compile.h

/* This file is auto generated, version 1 */
/* SMP */
#define UTS_MACHINE "x86_64"
#define UTS_VERSION "#1 SMP Mon Apr 6 19:05:53 CEST 2020"
#define LINUX_COMPILE_BY "dileks"
#define LINUX_COMPILE_HOST "iniza"
#define LINUX_COMPILER "clang version 10.0.0-2, LLD 10.0.0"

- sed@ -