linux-kernel - Re: [PATCH] kexec_file: Adjust type of kexec

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Date:   Wed, 10 May 2017 12:54:00 -0700
From:   Kees Cook <keescook@...omium.org>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     Daniel Micay <danielmicay@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Kexec Mailing List <kexec@...ts.infradead.org>
Subject: Re: [PATCH] kexec_file: Adjust type of kexec_purgatory

On Tue, May 9, 2017 at 5:15 PM, Eric W. Biederman <ebiederm@...ssion.com> wrote:
> Kees Cook <keescook@...omium.org> writes:
>> kernel/kexec_file.c:33:13: warning: array ‘kexec_purgatory’ assumed to
>> have one element
>>  char __weak kexec_purgatory[];
>>              ^~~~~~~~~~~~~~~
>
> Nor does "void *kexec_purgatory" as that says at the address known as
> kexec_purgatory is a void pointer not a blob a bytes that can be used
> for something interesting.
>
> Better to get rid of the __weak and deal with that fallout.

Agreed. This is actually pretty easy, since only x86 and PPC use
kexec_file, and both define purgatories. I'll send an updated patch.

Thanks!

-Kees

-- 
Kees Cook
Pixel Security