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ima: initialize the "template" field with the default template

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IMA policy rules are walked sequentially.  Depending on the ordering of
the policy rules, the "template" field might be defined in one rule, but
will be replaced by subsequent, applicable rules, even if the rule does
not explicitly define the "template" field.

This patch initializes the "template" once and only replaces the
"template", when explicitly defined.

Fixes: 19453ce0bc ("IMA: support for per policy rule template formats")
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
This commit is contained in:
Mimi Zohar 2019-07-19 07:16:57 -04:00
parent 609488bc97
commit b36f281f4a
1 changed files with 4 additions and 2 deletions
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6
security/integrity/ima/ima_policy.c
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@ -491,6 +491,9 @@ int ima_match_policy(struct inode *inode, const struct cred *cred, u32 secid,
struct ima_rule_entry *entry;
int action = 0, actmask = flags | (flags << 1);
if (template_desc)
*template_desc = ima_template_desc_current();
rcu_read_lock();
list_for_each_entry_rcu(entry, ima_rules, list) {
@ -510,6 +513,7 @@ int ima_match_policy(struct inode *inode, const struct cred *cred, u32 secid,
action |= IMA_FAIL_UNVERIFIABLE_SIGS;
}
if (entry->action & IMA_DO_MASK)
actmask &= ~(entry->action | entry->action << 1);
else
@ -520,8 +524,6 @@ int ima_match_policy(struct inode *inode, const struct cred *cred, u32 secid,
if (template_desc && entry->template)
*template_desc = entry->template;
else if (template_desc)
*template_desc = ima_template_desc_current();
if (!actmask)
break;