linux-kernel - Re: [PATCH 1/6] crypto: api - laying macros for statically allocated buffers

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAJHCu1KkNgiFR1cZ+T6-+t5-41theqVsLU8umgqLi8JWhs2nxw@mail.gmail.com>
Date:   Sun, 8 Apr 2018 10:56:17 +0200
From:   Salvatore Mesoraca <s.mesoraca16@...il.com>
To:     Herbert Xu <herbert@...dor.apana.org.au>
Cc:     linux-kernel@...r.kernel.org,
        Kernel Hardening <kernel-hardening@...ts.openwall.com>,
        linux-crypto@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Kees Cook <keescook@...omium.org>,
        Eric Biggers <ebiggers3@...il.com>,
        Laura Abbott <labbott@...hat.com>
Subject: Re: [PATCH 1/6] crypto: api - laying macros for statically allocated buffers

2018-04-08 5:15 GMT+02:00 Herbert Xu <herbert@...dor.apana.org.au>:
> On Sat, Apr 07, 2018 at 08:38:18PM +0200, Salvatore Mesoraca wrote:
>> Creating 2 new compile-time constants for internal use,
>> in preparation for the removal of VLAs[1] from crypto code.
>> All ciphers implemented in Linux have a block size less than or
>> equal to 16 bytes and the most demanding hw require 16 bytes
>> alignment for the block buffer.
>>
>> [1] http://lkml.kernel.org/r/CA+55aFzCG-zNmZwX4A2FQpadafLfEzK6CC=qPXydAacU1RqZWA@mail.gmail.com
>>
>> Signed-off-by: Salvatore Mesoraca <s.mesoraca16@...il.com>
>> ---
>>  crypto/internal.h | 8 ++++++++
>>  1 file changed, 8 insertions(+)
>>
>> diff --git a/crypto/internal.h b/crypto/internal.h
>> index 9a3f399..89ae41e 100644
>> --- a/crypto/internal.h
>> +++ b/crypto/internal.h
>> @@ -26,6 +26,14 @@
>>  #include <linux/rwsem.h>
>>  #include <linux/slab.h>
>>
>> +/*
>> + * Maximum values for blocksize and alignmask, used to allocate
>> + * static buffers that are big enough for any combination of
>> + * ciphers and architectures.
>> + */
>> +#define MAX_BLOCKSIZE                        16
>> +#define MAX_ALIGNMASK                        15
>
> No please don't put this here if you intend on using it everywhere.
> This file is reserved for truly internal bits.
>
> Perhaps include/crypto/algapi.h would be a better place.

OK, thank you for the suggestion :)

Salvatore