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lsm: use lsm_prop in security_audit_rule_match

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Change the secid parameter of security_audit_rule_match
to a lsm_prop structure pointer. Pass the entry from the
lsm_prop structure for the approprite slot to the LSM hook.

Change the users of security_audit_rule_match to use the
lsm_prop instead of a u32. The scaffolding function lsmprop_init()
fills the structure 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 lsm_prop structure later in the series.
At that point the use of lsmprop_init() is dropped.

Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
[PM: subject line tweak]
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Casey Schaufler
2024-10-09 10:32:10 -07:00
committed by Paul Moore
parent ed870e35db
commit 870b7fdc66
12 changed files with 63 additions and 31 deletions
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11
kernel/auditfilter.c
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@@ -1339,8 +1339,8 @@ int audit_filter(int msgtype, unsigned int listtype)
for (i = 0; i < e->rule.field_count; i++) {
struct audit_field *f = &e->rule.fields[i];
struct lsm_prop prop = { };
pid_t pid;
u32 sid;
switch (f->type) {
case AUDIT_PID:
@@ -1370,9 +1370,12 @@ int audit_filter(int msgtype, unsigned int listtype)
case AUDIT_SUBJ_SEN:
case AUDIT_SUBJ_CLR:
if (f->lsm_rule) {
security_current_getsecid_subj(&sid);
result = security_audit_rule_match(sid,
f->type, f->op, f->lsm_rule);
/* scaffolding */
security_current_getsecid_subj(
&prop.scaffold.secid);
result = security_audit_rule_match(
&prop, f->type, f->op,
f->lsm_rule);
}
break;
case AUDIT_EXE: