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ima: Have the LSM free its audit rule

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[ Upstream commit 9ff8a616dfab96a4fa0ddd36190907dc68886d9b ]

Ask the LSM to free its audit rule rather than directly calling kfree().
Both AppArmor and SELinux do additional work in their audit_rule_free()
hooks. Fix memory leaks by allowing the LSMs to perform necessary work.

Fixes: b169424551 ("ima: use the lsm policy update notifier")
Signed-off-by: Tyler Hicks <tyhicks@linux.microsoft.com>
Cc: Janne Karhunen <janne.karhunen@gmail.com>
Cc: Casey Schaufler <casey@schaufler-ca.com>
Reviewed-by: Mimi Zohar <zohar@linux.ibm.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Tyler Hicks 2020-07-09 01:19:00 -05:00 • committed by Greg Kroah-Hartman
commit 2092075629
2 changed files with 6 additions and 1 deletions
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5
security/integrity/ima/ima.h
View file

@ -362,6 +362,7 @@ static inline void ima_free_modsig(struct modsig *modsig)
#ifdef CONFIG_IMA_LSM_RULES
#define security_filter_rule_init security_audit_rule_init
#define security_filter_rule_free security_audit_rule_free
#define security_filter_rule_match security_audit_rule_match
#else
@ -372,6 +373,10 @@ static inline int security_filter_rule_init(u32 field, u32 op, char *rulestr,
return -EINVAL;
}
static inline void security_filter_rule_free(void *lsmrule)
{
}
static inline int security_filter_rule_match(u32 secid, u32 field, u32 op,
void *lsmrule)
{

2
security/integrity/ima/ima_policy.c
View file

@ -254,7 +254,7 @@ static void ima_lsm_free_rule(struct ima_rule_entry *entry)
int i;
for (i = 0; i < MAX_LSM_RULES; i++) {
kfree(entry->lsm[i].rule);
security_filter_rule_free(entry->lsm[i].rule);
kfree(entry->lsm[i].args_p);
}
kfree(entry);