linux-kernel - Re: [RFC v2 4/7] modsig: add integrity_module

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Message-ID: <CALLzPKb-qpAJCThHxukEUGGhOWUTxr5wCP7C1MmZfNZrdMViGg@mail.gmail.com>
Date:	Thu, 16 Aug 2012 22:56:02 +0300
From:	"Kasatkin, Dmitry" <dmitry.kasatkin@...el.com>
To:	Josh Boyer <jwboyer@...il.com>
Cc:	zohar@...ux.vnet.ibm.com, jmorris@...ei.org, rusty@...tcorp.com.au,
	dhowells@...hat.com, linux-security-module@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC v2 4/7] modsig: add integrity_module_check hook

On Thu, Aug 16, 2012 at 9:49 PM, Josh Boyer <jwboyer@...il.com> wrote:
> On Wed, Aug 15, 2012 at 2:43 PM, Dmitry Kasatkin
> <dmitry.kasatkin@...el.com> wrote:
>> @@ -2437,6 +2438,14 @@ static int copy_and_check(struct load_info *info,
>>
>>         info->hdr = hdr;
>>         info->len = len;
>> +
>> +       err = integrity_module_check(hdr, len);
>> +       if (err < 0)
>> +               goto free_hdr;
>> +
>> +       /* cut signature tail */
>> +       info->len = err;
>> +
>>         return 0;
>>
>>  free_hdr:
>
> So if I'm reading this correctly, any module that fails signature
> verification will fail to load.  That makes sense, but I wonder if you
> intend to support a non-enforcing mode for module signatures at all?
> Actually, a brief document in Documentation describing how this whole
> mechanism works and what the fail states are would be good.  David's
> patches have it nicely spelled out and I don't see anything similar in
> your patch set.
>
> josh

Hi,

I had enable and enforce mode in my previous patches.
I have removed them just before posting.
I added now enforcing back..

- Dmitry
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