[PATCH 4.14 027/156] ima/policy: fix parsing of fsuuid

From: Greg Kroah-Hartman
Date: Fri Feb 02 2018 - 13:06:07 EST


4.14-stable review patch. If anyone has any objections, please let me know.

------------------

From: Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx>

commit 36447456e1cca853188505f2a964dbbeacfc7a7a upstream.

The switch to uuid_t invereted the logic of verfication that &entry->fsuuid
is zero during parsing of "fsuuid=" rule. Instead of making sure the
&entry->fsuuid field is not attempted to be overwritten, we bail out for
perfectly correct rule.

Fixes: 787d8c530af7 ("ima/policy: switch to use uuid_t")
Signed-off-by: Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Mimi Zohar <zohar@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
security/integrity/ima/ima_policy.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -743,7 +743,7 @@ static int ima_parse_rule(char *rule, st
case Opt_fsuuid:
ima_log_string(ab, "fsuuid", args[0].from);

- if (uuid_is_null(&entry->fsuuid)) {
+ if (!uuid_is_null(&entry->fsuuid)) {
result = -EINVAL;
break;
}