linux-kernel - Re: [v3] crypto: ctr

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Date:   Wed, 4 Apr 2018 11:49:54 +0200
From:   Salvatore Mesoraca <s.mesoraca16@...il.com>
To:     Laura Abbott <labbott@...hat.com>
Cc:     linux-kernel@...r.kernel.org,
        Kernel Hardening <kernel-hardening@...ts.openwall.com>,
        linux-crypto@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Kees Cook <keescook@...omium.org>,
        Eric Biggers <ebiggers3@...il.com>
Subject: Re: [v3] crypto: ctr - avoid VLA use

2018-04-03 23:37 GMT+02:00 Laura Abbott <labbott@...hat.com>:
> On 03/30/2018 01:53 AM, Salvatore Mesoraca wrote:
>> ---
>>   crypto/ctr.c | 15 +++++++++++++--
>>   1 file changed, 13 insertions(+), 2 deletions(-)
>>
>> diff --git a/crypto/ctr.c b/crypto/ctr.c
>> index 854d924..49c469d 100644
>> --- a/crypto/ctr.c
>> +++ b/crypto/ctr.c
>> @@ -21,6 +21,9 @@
>>   #include <linux/scatterlist.h>
>>   #include <linux/slab.h>
>>   +#define MAX_BLOCKSIZE 16
>> +#define MAX_ALIGNMASK 15
>> +
>
>
> Can we pull this out into a header file, I think this would cover
>
> crypto/cipher.c: In function ‘cipher_crypt_unaligned’:
> crypto/cipher.c:70:2: warning: ISO C90 forbids variable length array
> ‘buffer’ [-Wvla]
>   u8 buffer[size + alignmask];
>   ^~

Yeah, I'll send a patchset that includes the fix for crypto/cipher.c too.

Thank you for the suggestion :)

Salvatore