[PATCH 5.8 239/464] ima: Have the LSM free its audit rule

[Greg Kroah-Hartman]

From: Tyler Hicks <tyhi...@linux.microsoft.com>

[ 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: b16942455193 ("ima: use the lsm policy update notifier")
Signed-off-by: Tyler Hicks <tyhi...@linux.microsoft.com>
Cc: Janne Karhunen <janne.karhu...@gmail.com>
Cc: Casey Schaufler <ca...@schaufler-ca.com>
Reviewed-by: Mimi Zohar <zo...@linux.ibm.com>
Signed-off-by: Mimi Zohar <zo...@linux.ibm.com>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 security/integrity/ima/ima.h        | 5 +++++
 security/integrity/ima/ima_policy.c | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
index 9d94080bdad82..f0748f8ca47e9 100644
--- a/security/integrity/ima/ima.h
+++ b/security/integrity/ima/ima.h
@@ -404,6 +404,7 @@ 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
@@ -414,6 +415,10 @@ 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)
 {
diff --git a/security/integrity/ima/ima_policy.c 
b/security/integrity/ima/ima_policy.c
index e493063a3c344..236a731492d1e 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -258,7 +258,7 @@ 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);
-- 
2.25.1