[PATCH v16 03/23] LSM: Use lsmblob in security_audit_rule_match
Casey Schaufler
casey at schaufler-ca.com
Tue Apr 7 00:01:39 UTC 2020
Change the secid parameter of security_audit_rule_match
to a lsmblob structure pointer. Pass the entry from the
lsmblob structure for the approprite slot to the LSM hook.
Change the users of security_audit_rule_match to use the
lsmblob instead of a u32. The scaffolding function lsmblob_init()
fills the blob with the value of the old secid, ensuring that
it is available to the appropriate module hook. The sources of
the secid, security_task_getsecid() and security_inode_getsecid(),
will be converted to use the blob structure later in the series.
At the point the use of lsmblob_init() is dropped.
Reviewed-by: Kees Cook <keescook at chromium.org>
Reviewed-by: John Johansen <john.johansen at canonical.com>
Acked-by: Stephen Smalley <sds at tycho.nsa.gov>
Signed-off-by: Casey Schaufler <casey at schaufler-ca.com>
---
include/linux/security.h | 7 ++++---
kernel/auditfilter.c | 6 ++++--
kernel/auditsc.c | 14 ++++++++++----
security/integrity/ima/ima.h | 4 ++--
security/integrity/ima/ima_policy.c | 7 +++++--
security/security.c | 6 ++++--
6 files changed, 29 insertions(+), 15 deletions(-)
diff --git a/include/linux/security.h b/include/linux/security.h
index 8c2751763c52..9d83c6832bae 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -1839,7 +1839,8 @@ static inline int security_key_getsecurity(struct key *key, char **_buffer)
#ifdef CONFIG_SECURITY
int security_audit_rule_init(u32 field, u32 op, char *rulestr, void **lsmrule);
int security_audit_rule_known(struct audit_krule *krule);
-int security_audit_rule_match(u32 secid, u32 field, u32 op, void **lsmrule);
+int security_audit_rule_match(struct lsmblob *blob, u32 field, u32 op,
+ void **lsmrule);
void security_audit_rule_free(void **lsmrule);
#else
@@ -1855,8 +1856,8 @@ static inline int security_audit_rule_known(struct audit_krule *krule)
return 0;
}
-static inline int security_audit_rule_match(u32 secid, u32 field, u32 op,
- void **lsmrule)
+static inline int security_audit_rule_match(struct lsmblob *blob, u32 field,
+ u32 op, void **lsmrule)
{
return 0;
}
diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c
index 978051c498d5..542eee7ad882 100644
--- a/kernel/auditfilter.c
+++ b/kernel/auditfilter.c
@@ -1333,6 +1333,7 @@ int audit_filter(int msgtype, unsigned int listtype)
struct audit_field *f = &e->rule.fields[i];
pid_t pid;
u32 sid;
+ struct lsmblob blob;
switch (f->type) {
case AUDIT_PID:
@@ -1363,8 +1364,9 @@ int audit_filter(int msgtype, unsigned int listtype)
case AUDIT_SUBJ_CLR:
if (f->lsm_isset) {
security_task_getsecid(current, &sid);
- result = security_audit_rule_match(sid,
- f->type, f->op,
+ lsmblob_init(&blob, sid);
+ result = security_audit_rule_match(
+ &blob, f->type, f->op,
f->lsm_rules);
}
break;
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 0c239c29a9d5..ef2f5e7eec7b 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -445,6 +445,7 @@ static int audit_filter_rules(struct task_struct *tsk,
const struct cred *cred;
int i, need_sid = 1;
u32 sid;
+ struct lsmblob blob;
unsigned int sessionid;
cred = rcu_dereference_check(tsk->cred, tsk == current || task_creation);
@@ -643,7 +644,9 @@ static int audit_filter_rules(struct task_struct *tsk,
security_task_getsecid(tsk, &sid);
need_sid = 0;
}
- result = security_audit_rule_match(sid, f->type,
+ lsmblob_init(&blob, sid);
+ result = security_audit_rule_match(&blob,
+ f->type,
f->op,
f->lsm_rules);
}
@@ -658,15 +661,17 @@ static int audit_filter_rules(struct task_struct *tsk,
if (f->lsm_isset) {
/* Find files that match */
if (name) {
+ lsmblob_init(&blob, name->osid);
result = security_audit_rule_match(
- name->osid,
+ &blob,
f->type,
f->op,
f->lsm_rules);
} else if (ctx) {
list_for_each_entry(n, &ctx->names_list, list) {
+ lsmblob_init(&blob, name->osid);
if (security_audit_rule_match(
- n->osid,
+ &blob,
f->type,
f->op,
f->lsm_rules)) {
@@ -678,7 +683,8 @@ static int audit_filter_rules(struct task_struct *tsk,
/* Find ipc objects that match */
if (!ctx || ctx->type != AUDIT_IPC)
break;
- if (security_audit_rule_match(ctx->ipc.osid,
+ lsmblob_init(&blob, ctx->ipc.osid);
+ if (security_audit_rule_match(&blob,
f->type, f->op,
f->lsm_rules))
++result;
diff --git a/security/integrity/ima/ima.h b/security/integrity/ima/ima.h
index 64317d95363e..f9e3ca96fa52 100644
--- a/security/integrity/ima/ima.h
+++ b/security/integrity/ima/ima.h
@@ -408,8 +408,8 @@ static inline int security_filter_rule_init(u32 field, u32 op, char *rulestr,
return -EINVAL;
}
-static inline int security_filter_rule_match(u32 secid, u32 field, u32 op,
- void *lsmrule)
+static inline int security_filter_rule_match(struct lsmblob *blob, u32 field,
+ u32 op, void *lsmrule)
{
return -EINVAL;
}
diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
index 006447d6c366..55cca6a57178 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -482,6 +482,7 @@ static bool ima_match_rules(struct ima_rule_entry *rule, struct inode *inode,
for (i = 0; i < MAX_LSM_RULES; i++) {
int rc = 0;
u32 osid;
+ struct lsmblob lsmdata;
if (!ima_lsm_isset(rule->lsm[i].rules)) {
if (!rule->lsm[i].args_p)
@@ -494,7 +495,8 @@ static bool ima_match_rules(struct ima_rule_entry *rule, struct inode *inode,
case LSM_OBJ_ROLE:
case LSM_OBJ_TYPE:
security_inode_getsecid(inode, &osid);
- rc = security_filter_rule_match(osid,
+ lsmblob_init(&lsmdata, osid);
+ rc = security_filter_rule_match(&lsmdata,
rule->lsm[i].type,
Audit_equal,
rule->lsm[i].rules);
@@ -502,7 +504,8 @@ static bool ima_match_rules(struct ima_rule_entry *rule, struct inode *inode,
case LSM_SUBJ_USER:
case LSM_SUBJ_ROLE:
case LSM_SUBJ_TYPE:
- rc = security_filter_rule_match(secid,
+ lsmblob_init(&lsmdata, secid);
+ rc = security_filter_rule_match(&lsmdata,
rule->lsm[i].type,
Audit_equal,
rule->lsm[i].rules);
diff --git a/security/security.c b/security/security.c
index 8e66f27d6adb..b3fab8fdbb57 100644
--- a/security/security.c
+++ b/security/security.c
@@ -2467,7 +2467,8 @@ void security_audit_rule_free(void **lsmrule)
}
}
-int security_audit_rule_match(u32 secid, u32 field, u32 op, void **lsmrule)
+int security_audit_rule_match(struct lsmblob *blob, u32 field, u32 op,
+ void **lsmrule)
{
struct security_hook_list *hp;
int rc;
@@ -2475,7 +2476,8 @@ int security_audit_rule_match(u32 secid, u32 field, u32 op, void **lsmrule)
hlist_for_each_entry(hp, &security_hook_heads.audit_rule_match, list) {
if (WARN_ON(hp->lsmid->slot < 0 || hp->lsmid->slot >= lsm_slot))
continue;
- rc = hp->hook.audit_rule_match(secid, field, op,
+ rc = hp->hook.audit_rule_match(blob->secid[hp->lsmid->slot],
+ field, op,
&lsmrule[hp->lsmid->slot]);
if (rc)
return rc;
--
2.24.1
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