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From: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
To: Tyler Hicks <tyhicks@linux.microsoft.com>,
	Mimi Zohar <zohar@linux.ibm.com>,
	Dmitry Kasatkin <dmitry.kasatkin@gmail.com>
Cc: James Morris <jmorris@namei.org>,
	"Serge E . Hallyn" <serge@hallyn.com>,
	Prakhar Srivastava <prsriva02@gmail.com>,
	linux-kernel@vger.kernel.org, linux-integrity@vger.kernel.org,
	linux-security-module@vger.kernel.org
Subject: Re: [PATCH v2 06/11] ima: Fail rule parsing when the KEY_CHECK hook is combined with an invalid cond
Date: Sat, 27 Jun 2020 16:39:08 -0700
Message-ID: <8eb0035d-f326-0299-aa4c-27d3db2deb2a@linux.microsoft.com> (raw)
In-Reply-To: <20200626223900.253615-7-tyhicks@linux.microsoft.com>

On 6/26/20 3:38 PM, Tyler Hicks wrote:
> The KEY_CHECK function only supports the uid, pcr, and keyrings
> conditionals. Make this clear at policy load so that IMA policy authors
> don't assume that other conditionals are supported.
> 
> Fixes: 5808611cccb2 ("IMA: Add KEY_CHECK func to measure keys")
> Signed-off-by: Tyler Hicks <tyhicks@linux.microsoft.com>
> ---
> 
> * v2
>    - No change
> 
>   security/integrity/ima/ima_policy.c | 7 +++++++
>   1 file changed, 7 insertions(+)
> 
> diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
> index 676d5557af1a..f9b1bdb897da 100644
> --- a/security/integrity/ima/ima_policy.c
> +++ b/security/integrity/ima/ima_policy.c
> @@ -1018,6 +1018,13 @@ static bool ima_validate_rule(struct ima_rule_entry *entry)
>   			if (entry->action & ~(MEASURE | DONT_MEASURE))
>   				return false;
>   
> +			if (entry->flags & ~(IMA_FUNC | IMA_UID | IMA_PCR |
> +					     IMA_KEYRINGS))
> +				return false;
> +
> +			if (ima_rule_contains_lsm_cond(entry))
> +				return false;
> +
>   			break;
>   		default:
>   			return false;
> 

Reviewed-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>


  reply index

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-26 22:38 [PATCH v2 00/11] ima: Fix rule parsing bugs and extend KEXEC_CMDLINE rule support Tyler Hicks
2020-06-26 22:38 ` [PATCH v2 01/11] ima: Have the LSM free its audit rule Tyler Hicks
2020-06-26 22:38 ` [PATCH v2 02/11] ima: Free the entire rule when deleting a list of rules Tyler Hicks
2020-06-26 22:38 ` [PATCH v2 03/11] ima: Free the entire rule if it fails to parse Tyler Hicks
2020-06-26 22:38 ` [PATCH v2 04/11] ima: Fail rule parsing when buffer hook functions have an invalid action Tyler Hicks
2020-06-26 22:38 ` [PATCH v2 05/11] ima: Fail rule parsing when the KEXEC_CMDLINE hook is combined with an invalid cond Tyler Hicks
2020-06-27 23:40   ` Lakshmi Ramasubramanian
2020-06-26 22:38 ` [PATCH v2 06/11] ima: Fail rule parsing when the KEY_CHECK " Tyler Hicks
2020-06-27 23:39   ` Lakshmi Ramasubramanian [this message]
2020-06-26 22:38 ` [PATCH v2 07/11] ima: Shallow copy the args_p member of ima_rule_entry.lsm elements Tyler Hicks
2020-06-26 22:38 ` [PATCH v2 08/11] ima: Use correct type for " Tyler Hicks
2020-06-26 22:38 ` [PATCH v2 09/11] ima: Move validation of the keyrings conditional into ima_validate_rule() Tyler Hicks
2020-06-27 23:49   ` Lakshmi Ramasubramanian
2020-06-29 14:16     ` Tyler Hicks
2020-06-30 23:07   ` Mimi Zohar
2020-07-02 22:16     ` Tyler Hicks
2020-07-03 14:15       ` Mimi Zohar
2020-07-06 13:18         ` Tyler Hicks
2020-07-07  3:18           ` Mimi Zohar
2020-06-26 22:38 ` [PATCH v2 10/11] ima: Use the common function to detect LSM conditionals in a rule Tyler Hicks
2020-06-26 22:39 ` [PATCH v2 11/11] ima: Support additional conditionals in the KEXEC_CMDLINE hook function Tyler Hicks
2020-06-28  0:03   ` Lakshmi Ramasubramanian
2020-07-01  8:04   ` Dave Young
2020-07-01 14:38     ` Tyler Hicks
2020-07-01  0:29 ` [PATCH v2 00/11] ima: Fix rule parsing bugs and extend KEXEC_CMDLINE rule support Mimi Zohar

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