linux-kernel - Re: [BUGFIX PATCH 1/1] bootconfig: Fix to remove bootconfig data from initrd while boot

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Message-ID: <20200424195833.1487a1a0@oasis.local.home>
Date:   Fri, 24 Apr 2020 19:58:33 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Borislav Petkov <bp@...en8.de>, Kees Cook <keescook@...omium.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [BUGFIX PATCH 1/1] bootconfig: Fix to remove bootconfig data
 from initrd while boot

On Sat, 25 Apr 2020 01:34:12 +0900
Masami Hiramatsu <mhiramat@...nel.org> wrote:

> If there is a bootconfig data in the tail of initrd/initramfs,
> initrd image sanity check caused an error while decompression
> stage as follows.
> 
> [    0.883882] Unpacking initramfs...
> [    2.696429] Initramfs unpacking failed: invalid magic at start of compressed archive
> 
> This error will be ignored if CONFIG_BLK_DEV_RAM=n,
> but CONFIG_BLK_DEV_RAM=y the kernel failed to mount rootfs
> and causes a panic.
> 
> To fix this issue, shrink down the initrd_end for removing
> tailing bootconfig data while boot the kernel.
> 
> Fixes: 7684b8582c24 ("bootconfig: Load boot config from the tail of initrd")
> Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
> Cc: stable@...r.kernel.org
> ---
>  init/main.c |   62 +++++++++++++++++++++++++++++++++++++++++++----------------
>  1 file changed, 45 insertions(+), 17 deletions(-)
> 
> 

A build with

 $ make allnoconfig

Produces this:

  MODPOST vmlinux.o
  MODINFO modules.builtin.modinfo
  GEN     modules.builtin
  LD      vmlinux
ld: init/main.o: in function `start_kernel':
main.c:(.init.text+0x37f): undefined reference to `initrd_end'
ld: main.c:(.init.text+0x3a7): undefined reference to `initrd_start'
ld: main.c:(.init.text+0x3ae): undefined reference to `initrd_end'
make[1]: *** [/work/git/linux-trace.git/Makefile:1106: vmlinux] Error 1

-- Steve