linux-kernel - Re: [PATCH] x86, build: move build output statistics away from stderr

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Message-ID: <CAGXu5jL8qzxGq49vBBH9f1+GgCtVUA8MK=ed-qmWMaq=TetPDg@mail.gmail.com>
Date:	Thu, 26 Sep 2013 15:36:09 -0500
From:	Kees Cook <keescook@...omium.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"x86@...nel.org" <x86@...nel.org>, Jiri Slaby <jslaby@...e.cz>,
	David Woodhouse <David.Woodhouse@...el.com>
Subject: Re: [PATCH] x86, build: move build output statistics away from stderr

On Mon, Sep 9, 2013 at 3:49 AM, Ingo Molnar <mingo@...nel.org> wrote:
>
> * Kees Cook <keescook@...omium.org> wrote:
>
>> When building on x86, the final image building step always emits stats
>> to stderr, even though this information is neither a warning nor an error:
>>
>>   BUILD   arch/x86/boot/bzImage
>> Setup is 16188 bytes (padded to 16384 bytes).
>> System is 6368 kB
>> CRC cbe50c61
>>
>> Validating automated builds would be cleaner if stderr did not have to
>> filter out these lines. Instead, change how tools/build is called, and
>> make the zoffset header unconditional, and write to a specified file
>> instead of to stdout, which can then be used for statistics, leaving
>> stderr open for legitimate warnings and errors, like the output from
>> die().
>
> Nice, that output to stderr was always somewhat annoying.
>
>> +     /* Catch any delayed write failures */
>> +     if (fclose(dest))
>> +             die("Writing image failed");
>> +
>>       close(fd);
>
> Looks like the new code is not just reporting errors better, but it's more
> robust by catching and reporting fclose()-time failures as well, avoiding
> a corrupt kernel image in certain corner cases - the most common being a
> file system full error I suspect.

Quick ping on this; can someone pick it up in their tree?

Thanks!

-Kees

>
> Thanks,
>
>         Ingo



-- 
Kees Cook
Chrome OS Security
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