LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Roberto Sassu <roberto.sassu@huawei.com>
To: prakhar srivastava <prsriva02@gmail.com>
Cc: <linux-integrity@vger.kernel.org>,
	<inux-security-module@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>, Mimi Zohar <zohar@linux.ibm.com>,
	<ebiederm@xmission.com>, <vgoyal@redhat.com>,
	Prakhar Srivastava <prsriva@microsoft.com>
Subject: Re: [PATCH 2/3 v5] add a new template field buf to contain the buffer
Date: Tue, 14 May 2019 15:22:46 +0200	[thread overview]
Message-ID: <ec8ee6f7-3a1d-6498-e009-f85e677b448a@huawei.com> (raw)
In-Reply-To: <CAEFn8qJVvNivP6Lmx+nVewPcHjH=V2OrR_HyHR6nOeuVQW0A4w@mail.gmail.com>

On 5/14/2019 7:07 AM, prakhar srivastava wrote:
> On Mon, May 13, 2019 at 6:48 AM Roberto Sassu <roberto.sassu@huawei.com> wrote:
>>
>> On 5/11/2019 12:37 AM, Prakhar Srivastava wrote:
>>> From: Prakhar Srivastava <prsriva02@gmail.com>
>>>
>>> The buffer(cmdline args) added to the ima log cannot be attested
>>> without having the actual buffer. Thus to make the measured buffer
>>> available to store/read a new ima template (buf) is added.
>>
>> Hi Prakhar
>>
>> please fix the typos. More comments below.
>>
>>
>>> +     buffer_event_data->type = IMA_XATTR_BUFFER;
>>> +     buffer_event_data->buf_length = size;
>>> +     memcpy(buffer_event_data->buf, buf, size);
>>> +
>>> +     event_data.xattr_value = (struct evm_ima_xattr_data *)buffer_event_data;
>>> +     event_data.xattr_len = alloc_length;
>>
>> I would prefer that you introduce two new fields in the ima_event_data
>> structure. You can initialize them directly with the parameters of
>> process_buffer_measurement().
> I will make the edits, this will definitely save the kzalloc in this code
> path.
>>
>> ima_write_template_field_data() will make
>> a copy.
>>
> Since event_data->type is used to distinguish what the template field
>   should contain.
> Removing the type and subsequent check in the template_init,
>   buf template fmt will result in the whole event_Data structure
> being added to the log, which is not the expected output.
> For buffer entries, the buf templet fmt will contains the buffer itself.

The purpose of ima_event_data is to pass data to the init method of
template fields. Each method takes the data it needs.

If you pass event_data->buf and event_data->buf_len to
ima_write_template_field_data() this should be fine.

Roberto


>>> +      .field_show = ima_show_template_buf},
>>
>> Please update Documentation/security/IMA-templates.rst
> Will update the documentation.
> 
> Thanks,
> Prakhar Srivastava
>>
>> Thanks
>>
>> Roberto

-- 
HUAWEI TECHNOLOGIES Duesseldorf GmbH, HRB 56063
Managing Director: Bo PENG, Jian LI, Yanli SHI

  reply	other threads:[~2019-05-14 13:22 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-10 22:37 [PATCH 0/3 v5] Kexec cmdline bufffer measure Prakhar Srivastava
2019-05-10 22:37 ` [PATCH 1/3 v5] add a new ima hook and policy to measure the cmdline Prakhar Srivastava
2019-05-13 16:56   ` Mimi Zohar
2019-05-14  4:53     ` prakhar srivastava
2019-05-14 14:36       ` Mimi Zohar
2019-05-10 22:37 ` [PATCH 2/3 v5] add a new template field buf to contain the buffer Prakhar Srivastava
2019-05-13 13:48   ` Roberto Sassu
2019-05-14  5:07     ` prakhar srivastava
2019-05-14 13:22       ` Roberto Sassu [this message]
2019-05-17 23:32         ` prakhar srivastava
2019-05-20 12:18           ` Roberto Sassu
2019-05-10 22:37 ` [PATCH 3/3 v5] call ima_kexec_cmdline from kexec_file_load path Prakhar Srivastava
2019-05-14 14:46   ` Mimi Zohar
  -- strict thread matches above, loose matches on Subject: below --
2019-05-10 22:32 [PATCH 0/3 v5] Kexec cmdline bufffer measure Prakhar Srivastava
2019-05-10 22:32 ` [PATCH 2/3 v5] add a new template field buf to contain the buffer Prakhar Srivastava

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=ec8ee6f7-3a1d-6498-e009-f85e677b448a@huawei.com \
    --to=roberto.sassu@huawei.com \
    --cc=ebiederm@xmission.com \
    --cc=inux-security-module@vger.kernel.org \
    --cc=linux-integrity@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=prsriva02@gmail.com \
    --cc=prsriva@microsoft.com \
    --cc=vgoyal@redhat.com \
    --cc=zohar@linux.ibm.com \
    --subject='Re: [PATCH 2/3 v5] add a new template field buf to contain the buffer' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).