linux-kernel - Re: [RFC 1/2] export unpack_to

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Date:	Tue, 5 Feb 2013 11:48:17 -0500
From:	Peter Jones <pjones@...hat.com>
To:	Dmitry Kasatkin <dmitry.kasatkin@...el.com>
Cc:	linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC 1/2] export unpack_to_rootfs

On Tue, Feb 05, 2013 at 02:34:49PM +0200, Dmitry Kasatkin wrote:
> Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@...el.com>
> ---
>  init/do_mounts.h |    2 ++
>  init/initramfs.c |    2 +-
>  2 files changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/init/do_mounts.h b/init/do_mounts.h
> index f5b978a..11829eb 100644
> --- a/init/do_mounts.h
> +++ b/init/do_mounts.h
> @@ -74,3 +74,5 @@ void md_run_setup(void);
>  static inline void md_run_setup(void) {}
>  
>  #endif
> +
> +char * __init unpack_to_rootfs(char *buf, unsigned len);
> diff --git a/init/initramfs.c b/init/initramfs.c
> index 84c6bf1..e32bc06 100644
> --- a/init/initramfs.c
> +++ b/init/initramfs.c
> @@ -421,7 +421,7 @@ static unsigned my_inptr;   /* index of next byte to be processed in inbuf */
>  
>  #include <linux/decompress/generic.h>
>  
> -static char * __init unpack_to_rootfs(char *buf, unsigned len)
> +char * __init unpack_to_rootfs(char *buf, unsigned len)
>  {
>  	int written, res;
>  	decompress_fn decompress;

Doing this unconditionally seems to be inviting rootkit authors to use a
new and shiny tool.  I also don't think it's the best way to do this,
but I'll comment on the other patch to explain why.

-- 
        Peter
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