Linux-Integrity Archive on lore.kernel.org
 help / color / Atom feed
From: Mimi Zohar <zohar@linux.ibm.com>
To: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>,
	linux-integrity@vger.kernel.org
Cc: eric.snowberg@oracle.com, dhowells@redhat.com,
	mathew.j.martineau@linux.intel.com, matthewgarrett@google.com,
	sashal@kernel.org, jamorris@linux.microsoft.com,
	linux-kernel@vger.kernel.org, keyrings@vger.kernel.org
Subject: Re: [PATCH v10 1/6] IMA: Check IMA policy flag
Date: Tue, 10 Dec 2019 17:42:29 -0500
Message-ID: <1576017749.4579.40.camel@linux.ibm.com> (raw)
In-Reply-To: <20191204224131.3384-2-nramas@linux.microsoft.com>

On Wed, 2019-12-04 at 14:41 -0800, Lakshmi Ramasubramanian wrote:
> Return immediately from process_buffer_measurement()
> if the IMA policy flag is set to zero. Not doing this
> can result in kernel panic when process_buffer_measurement()
> is called before IMA is initialized (for instance, when
> the IMA hook is called when a key is added to
> the .builtin_trusted_keys keyring).
> 
> This change adds the check in process_buffer_measurement()
> to return immediately if ima_policy_flag is set to zero.

Patch descriptions aren't suppose to be written as pseudo code.  Start
with the current status and problem description.

For example, "process_buffer_measurement() may be called prior to IMA being initialized, which would result in a kernel panic.  This patch ..."

Mimi

> 
> Signed-off-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
> ---
>  security/integrity/ima/ima_main.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
> index d7e987baf127..9b35db2fc777 100644
> --- a/security/integrity/ima/ima_main.c
> +++ b/security/integrity/ima/ima_main.c
> @@ -655,6 +655,9 @@ void process_buffer_measurement(const void *buf, int size,
>  	int action = 0;
>  	u32 secid;
>  
> +	if (!ima_policy_flag)
> +		return;
> +
>  	/*
>  	 * Both LSM hooks and auxilary based buffer measurements are
>  	 * based on policy.  To avoid code duplication, differentiate


  reply index

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-04 22:41 [PATCH v10 0/6] KEYS: Measure keys when they are created or updated Lakshmi Ramasubramanian
2019-12-04 22:41 ` [PATCH v10 1/6] IMA: Check IMA policy flag Lakshmi Ramasubramanian
2019-12-10 22:42   ` Mimi Zohar [this message]
2019-12-10 23:29     ` Lakshmi Ramasubramanian
2019-12-11  0:03       ` Mimi Zohar
2019-12-04 22:41 ` [PATCH v10 2/6] IMA: Add KEY_CHECK func to measure keys Lakshmi Ramasubramanian
2019-12-04 22:41 ` [PATCH v10 3/6] IMA: Define an IMA hook " Lakshmi Ramasubramanian
2019-12-10 22:42   ` Mimi Zohar
2019-12-04 22:41 ` [PATCH v10 4/6] KEYS: Call the " Lakshmi Ramasubramanian
2019-12-10 22:43   ` Mimi Zohar
2019-12-04 22:41 ` [PATCH v10 5/6] IMA: Add support to limit measuring keys Lakshmi Ramasubramanian
2019-12-10 22:43   ` Mimi Zohar
2019-12-10 23:23     ` Lakshmi Ramasubramanian
2019-12-04 22:41 ` [PATCH v10 6/6] IMA: Read keyrings= option from the IMA policy Lakshmi Ramasubramanian
2019-12-10 22:43   ` Mimi Zohar

Reply instructions:

You may reply publically 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=1576017749.4579.40.camel@linux.ibm.com \
    --to=zohar@linux.ibm.com \
    --cc=dhowells@redhat.com \
    --cc=eric.snowberg@oracle.com \
    --cc=jamorris@linux.microsoft.com \
    --cc=keyrings@vger.kernel.org \
    --cc=linux-integrity@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mathew.j.martineau@linux.intel.com \
    --cc=matthewgarrett@google.com \
    --cc=nramas@linux.microsoft.com \
    --cc=sashal@kernel.org \
    /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

Linux-Integrity Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-integrity/0 linux-integrity/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-integrity linux-integrity/ https://lore.kernel.org/linux-integrity \
		linux-integrity@vger.kernel.org
	public-inbox-index linux-integrity

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-integrity


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git