linux-kernel - Re: [PATCH 25/42] x86, boot: print compression suffix in decompress stage

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Date:	Tue, 7 Jul 2015 16:13:48 -0700
From:	Kees Cook <keescook@...omium.org>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Baoquan He <bhe@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 25/42] x86, boot: print compression suffix in decompress stage

On Tue, Jul 7, 2015 at 1:20 PM, Yinghai Lu <yinghai@...nel.org> wrote:
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> ---
>  arch/x86/boot/compressed/misc.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
>
> diff --git a/arch/x86/boot/compressed/misc.c b/arch/x86/boot/compressed/misc.c
> index a428c03..9266f78 100644
> --- a/arch/x86/boot/compressed/misc.c
> +++ b/arch/x86/boot/compressed/misc.c
> @@ -120,26 +120,32 @@ static int lines, cols;
>
>  #ifdef CONFIG_KERNEL_GZIP
>  #include "../../../../lib/decompress_inflate.c"
> +static char *suffix_str = "gz";
>  #endif
>
>  #ifdef CONFIG_KERNEL_BZIP2
>  #include "../../../../lib/decompress_bunzip2.c"
> +static char *suffix_str = "bz2";
>  #endif
>
>  #ifdef CONFIG_KERNEL_LZMA
>  #include "../../../../lib/decompress_unlzma.c"
> +static char *suffix_str = "lzma";
>  #endif
>
>  #ifdef CONFIG_KERNEL_XZ
>  #include "../../../../lib/decompress_unxz.c"
> +static char *suffix_str = "xz";
>  #endif
>
>  #ifdef CONFIG_KERNEL_LZO
>  #include "../../../../lib/decompress_unlzo.c"
> +static char *suffix_str = "lzo";
>  #endif
>
>  #ifdef CONFIG_KERNEL_LZ4
>  #include "../../../../lib/decompress_unlz4.c"
> +static char *suffix_str = "lz4";
>  #endif

I like the idea!

>
>  static void scroll(void)
> @@ -486,6 +492,8 @@ asmlinkage __visible void *decompress_kernel(void *rmode, memptr heap,
>                 (unsigned long)input_data,
>                 (unsigned long)input_data + input_len - 1);
>         debug_putstr("\nDecompressing Linux... ");
> +       debug_putstr(suffix_str);
> +       debug_putstr("... ");

I wouldn't repeat the "...". Maybe remove "..." from the Decompressing putstr?

-Kees

>         decompress(input_data, input_len, NULL, NULL, output, NULL, error);
>         parse_elf(output);
>         handle_relocations(output, output_len, virt_offset);
> --
> 1.8.4.5
>
> --
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-- 
Kees Cook
Chrome OS Security
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