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IMA: do not allow the same rule to specify the same thing twice 

IMA will accept rules which specify things twice and will only pay
attention to the last one.  We should reject such rules.

Signed-off-by: Eric Paris <eparis@redhat.com>
Acked-by: Mimi Zohar <zohar@us.ibm.com>
Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
Eric Paris 2010-04-20 10:21:01 -04:00 committed by James Morris
parent 6ccd045630
commit 7b62e16212
1 changed files with 33 additions and 1 deletions
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34
security/integrity/ima/ima_policy.c
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@ -245,6 +245,9 @@ static int ima_lsm_rule_init(struct ima_measure_rule_entry *entry,
{
int result;
if (entry->lsm[lsm_rule].rule)
return -EINVAL;
entry->lsm[lsm_rule].type = audit_type;
result = security_filter_rule_init(entry->lsm[lsm_rule].type,
Audit_equal, args,
@ -260,6 +263,7 @@ static int ima_parse_rule(char *rule, struct ima_measure_rule_entry *entry)
ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_INTEGRITY_RULE);
entry->uid = -1;
entry->action = -1;
while ((p = strsep(&rule, " ")) != NULL) {
substring_t args[MAX_OPT_ARGS];
@ -274,14 +278,26 @@ static int ima_parse_rule(char *rule, struct ima_measure_rule_entry *entry)
switch (token) {
case Opt_measure:
audit_log_format(ab, "%s ", "measure");
if (entry->action != UNKNOWN)
result = -EINVAL;
entry->action = MEASURE;
break;
case Opt_dont_measure:
audit_log_format(ab, "%s ", "dont_measure");
if (entry->action != UNKNOWN)
result = -EINVAL;
entry->action = DONT_MEASURE;
break;
case Opt_func:
audit_log_format(ab, "func=%s ", args[0].from);
if (entry->func)
result = -EINVAL;
if (strcmp(args[0].from, "FILE_CHECK") == 0)
entry->func = FILE_CHECK;
/* PATH_CHECK is for backwards compat */
@ -298,6 +314,10 @@ static int ima_parse_rule(char *rule, struct ima_measure_rule_entry *entry)
break;
case Opt_mask:
audit_log_format(ab, "mask=%s ", args[0].from);
if (entry->mask)
result = -EINVAL;
if ((strcmp(args[0].from, "MAY_EXEC")) == 0)
entry->mask = MAY_EXEC;
else if (strcmp(args[0].from, "MAY_WRITE") == 0)
@ -313,6 +333,12 @@ static int ima_parse_rule(char *rule, struct ima_measure_rule_entry *entry)
break;
case Opt_fsmagic:
audit_log_format(ab, "fsmagic=%s ", args[0].from);
if (entry->fsmagic) {
result = -EINVAL;
break;
}
result = strict_strtoul(args[0].from, 16,
&entry->fsmagic);
if (!result)
@ -320,6 +346,12 @@ static int ima_parse_rule(char *rule, struct ima_measure_rule_entry *entry)
break;
case Opt_uid:
audit_log_format(ab, "uid=%s ", args[0].from);
if (entry->uid != -1) {
result = -EINVAL;
break;
}
result = strict_strtoul(args[0].from, 10, &lnum);
if (!result) {
entry->uid = (uid_t) lnum;
@ -370,7 +402,7 @@ static int ima_parse_rule(char *rule, struct ima_measure_rule_entry *entry)
break;
}
}
if (entry->action == UNKNOWN)
if (!result && (entry->action == UNKNOWN))
result = -EINVAL;
audit_log_format(ab, "res=%d", !!result);