From: Casey Schaufler <casey@schaufler-ca.com>
To: Mimi Zohar <zohar@linux.ibm.com>,
casey.schaufler@intel.com, jmorris@namei.org,
linux-security-module@vger.kernel.org, selinux@vger.kernel.org,
Matthew Garrett <mjg59@google.com>
Cc: keescook@chromium.org, john.johansen@canonical.com,
penguin-kernel@i-love.sakura.ne.jp, paul@paul-moore.com,
sds@tycho.nsa.gov, Casey Schaufler <casey@schaufler-ca.com>
Subject: Re: [PATCH v12 03/25] LSM: Use lsmblob in security_audit_rule_match
Date: Tue, 31 Dec 2019 09:36:26 -0800 [thread overview]
Message-ID: <f0eae3ec-f13d-e660-8fb8-7a1e139f806b@schaufler-ca.com> (raw)
In-Reply-To: <1577812497.5874.97.camel@linux.ibm.com>
On 12/31/2019 9:14 AM, Mimi Zohar wrote:
> [Cc'ing Matthew Garret based on the additional bprm call to
> process_measurement() - commit d906c10d8a31 ("IMA: Support using new
> creds in appraisal policy")]
>
> On Tue, 2019-12-24 at 15:18 -0800, Casey Schaufler wrote:
>> diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
>> index f19a895ad7cd..193ddd55420b 100644
>> --- a/security/integrity/ima/ima_policy.c
>> +++ b/security/integrity/ima/ima_policy.c
>> @@ -414,6 +414,7 @@ static bool ima_match_rules(struct ima_rule_entry *rule, struct inode *inode,
>> for (i = 0; i < MAX_LSM_RULES; i++) {
>> int rc = 0;
>> u32 osid;
>> + struct lsmblob blob;
>>
>> if (!rule->lsm[i].rule)
>> continue;
>> @@ -423,7 +424,8 @@ static bool ima_match_rules(struct ima_rule_entry *rule, struct inode *inode,
>> case LSM_OBJ_ROLE:
>> case LSM_OBJ_TYPE:
>> security_inode_getsecid(inode, &osid);
>> - rc = security_filter_rule_match(osid,
>> + lsmblob_init(&blob, osid);
>> + rc = security_filter_rule_match(&blob,
>> rule->lsm[i].type,
>> Audit_equal,
>> rule->lsm[i].rule);
>> @@ -431,7 +433,8 @@ static bool ima_match_rules(struct ima_rule_entry *rule, struct inode *inode,
>> case LSM_SUBJ_USER:
>> case LSM_SUBJ_ROLE:
>> case LSM_SUBJ_TYPE:
>> - rc = security_filter_rule_match(secid,
>> + lsmblob_init(&blob, secid);
>> + rc = security_filter_rule_match(&blob,
> On the bprm hook, IMA calls process_measurement() twice. The first
> time the secid is passed as an argument based on a call to
> security_task_getsecid(), while the second time it is based on
> security_cred_getsecid(). process_measurement() passes the correct
> secid converted to a blob, but instead of using the passed variable,
> this code uses the locally defined blob field. A later patch removes
> the the lsmblob_init(), leaving the local blob uninitialized.
> Something is terribly wrong here.
I can see that there's significant work required on audit rule
filtering. security_audit_rule_init() isn't going to work correctly
the way it is.
I'll admit that the aliasing of audit_rule to filter_rule had me
very confused for some time.
>
> Mimi
>
>> rule->lsm[i].type,
>> Audit_equal,
>> rule->lsm[i].rule);
>
>
next prev parent reply other threads:[~2019-12-31 17:36 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20191224231915.7208-1-casey.ref@schaufler-ca.com>
2019-12-24 23:18 ` [PATCH v12 00/25] LSM: Module stacking for AppArmor Casey Schaufler
2019-12-24 23:18 ` [PATCH v12 01/25] LSM: Infrastructure management of the sock security Casey Schaufler
2019-12-24 23:18 ` [PATCH v12 02/25] LSM: Create and manage the lsmblob data structure Casey Schaufler
2019-12-24 23:18 ` [PATCH v12 03/25] LSM: Use lsmblob in security_audit_rule_match Casey Schaufler
2019-12-31 17:14 ` Mimi Zohar
2019-12-31 17:36 ` Casey Schaufler [this message]
2019-12-24 23:18 ` [PATCH v12 04/25] LSM: Use lsmblob in security_kernel_act_as Casey Schaufler
2019-12-24 23:18 ` [PATCH v12 05/25] net: Prepare UDS for security module stacking Casey Schaufler
2019-12-24 23:18 ` [PATCH v12 06/25] LSM: Use lsmblob in security_secctx_to_secid Casey Schaufler
2019-12-24 23:18 ` [PATCH v12 07/25] LSM: Use lsmblob in security_secid_to_secctx Casey Schaufler
2019-12-24 23:18 ` [PATCH v12 08/25] LSM: Use lsmblob in security_ipc_getsecid Casey Schaufler
2019-12-24 23:18 ` [PATCH v12 09/25] LSM: Use lsmblob in security_task_getsecid Casey Schaufler
2019-12-24 23:19 ` [PATCH v12 10/25] LSM: Use lsmblob in security_inode_getsecid Casey Schaufler
2019-12-24 23:19 ` [PATCH v12 11/25] LSM: Use lsmblob in security_cred_getsecid Casey Schaufler
2019-12-24 23:19 ` [PATCH v12 12/25] IMA: Change internal interfaces to use lsmblobs Casey Schaufler
2019-12-24 23:19 ` [PATCH v12 13/25] LSM: Specify which LSM to display Casey Schaufler
2019-12-24 23:19 ` [PATCH v12 14/25] LSM: Ensure the correct LSM context releaser Casey Schaufler
2019-12-24 23:19 ` [PATCH v12 15/25] LSM: Use lsmcontext in security_secid_to_secctx Casey Schaufler
2019-12-24 23:19 ` [PATCH v12 16/25] LSM: Use lsmcontext in security_dentry_init_security Casey Schaufler
2019-12-24 23:19 ` [PATCH v12 17/25] LSM: Use lsmcontext in security_inode_getsecctx Casey Schaufler
2019-12-24 23:19 ` [PATCH v12 18/25] LSM: security_secid_to_secctx in netlink netfilter Casey Schaufler
2019-12-24 23:19 ` [PATCH v12 19/25] NET: Store LSM netlabel data in a lsmblob Casey Schaufler
2019-12-24 23:19 ` [PATCH v12 20/25] LSM: Verify LSM display sanity in binder Casey Schaufler
2019-12-24 23:19 ` [PATCH v12 21/25] Audit: Add subj_LSM fields when necessary Casey Schaufler
2019-12-24 23:19 ` [PATCH v12 22/25] Audit: Include object data for all security modules Casey Schaufler
2019-12-24 23:19 ` [PATCH v12 23/25] NET: Add SO_PEERCONTEXT for multiple LSMs Casey Schaufler
2019-12-24 23:19 ` [PATCH v12 24/25] LSM: Add /proc attr entry for full LSM context Casey Schaufler
2019-12-24 23:19 ` [PATCH v12 25/25] AppArmor: Remove the exclusive flag Casey Schaufler
2019-12-24 23:58 ` [PATCH v12 00/25] LSM: Module stacking for AppArmor Casey Schaufler
2019-12-16 22:35 Casey Schaufler
2019-12-16 22:35 ` [PATCH v12 03/25] LSM: Use lsmblob in security_audit_rule_match Casey Schaufler
2019-12-17 17:34 ` Stephen Smalley
2019-12-17 22:01 ` Casey Schaufler
2019-12-17 23:47 ` Kees Cook
2019-12-18 0:28 ` Casey Schaufler
2019-12-18 13:16 ` Stephen Smalley
-- strict thread matches above, loose matches on Subject: below --
2019-12-16 22:33 [PATCH v12 00/25] LSM: Module stacking for AppArmor Casey Schaufler
2019-12-16 22:33 ` [PATCH v12 03/25] LSM: Use lsmblob in security_audit_rule_match Casey Schaufler
2019-12-16 22:24 [PATCH v12 00/25] LSM: Module stacking for AppArmor Casey Schaufler
2019-12-16 22:24 ` [PATCH v12 03/25] LSM: Use lsmblob in security_audit_rule_match Casey Schaufler
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