linux-kernel - Re: [PATCH v2] pstore: fix crypto dependencies without compression

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Date:   Fri, 6 Apr 2018 15:44:17 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Tobias Regnery <tobias.regnery@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] pstore: fix crypto dependencies without compression

On Fri, Apr 6, 2018 at 12:56 AM, Arnd Bergmann <arnd@...db.de> wrote:
> On Fri, Apr 6, 2018 at 9:25 AM, Tobias Regnery <tobias.regnery@...il.com> wrote:
>> Commit 58eb5b670747 ("pstore: fix crypto dependencies") fixed up the crypto
>> dependencies but missed the case when no compression is selected.
>>
>> With CONFIG_PSTORE=y, CONFIG_PSTORE_COMPRESS=n  and CONFIG_CRYPTO=m we see
>> the following link error:
>>
>> fs/pstore/platform.o: In function `pstore_register':
>> (.text+0x1b1): undefined reference to `crypto_has_alg'
>> (.text+0x205): undefined reference to `crypto_alloc_base'
>> fs/pstore/platform.o: In function `pstore_unregister':
>> (.text+0x3b0): undefined reference to `crypto_destroy_tfm'
>>
>> Fix this by checking at compile-time if CONFIG_PSTORE_COMPRESS is enabled.
>>
>> Fixes: 58eb5b670747 ("pstore: fix crypto dependencies")
>> Signed-off-by: Tobias Regnery <tobias.regnery@...il.com>
>> ---
>> v2: check the config at compile-time rather than change the
>>     kconfig-dependency as suggested by Arnd.
>
> Thanks!
>
> Acked-by: Arnd Bergmann <arnd@...db.de>

Thanks! I'll apply this.

-Kees

-- 
Kees Cook
Pixel Security