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ima: Fail rule parsing when the KEY_CHECK hook is combined with an invalid cond

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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: 5808611ccc ("IMA: Add KEY_CHECK func to measure keys")
Signed-off-by: Tyler Hicks <tyhicks@linux.microsoft.com>
Reviewed-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
This commit is contained in:
Tyler Hicks 2020-07-09 01:19:05 -05:00 committed by Mimi Zohar
parent db2045f589
commit eb624fe214
1 changed files with 7 additions and 0 deletions
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7
security/integrity/ima/ima_policy.c
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@ -1023,6 +1023,13 @@ 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;