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. Signed-off-by: Casey Schaufler <ca...@schaufler-ca.com> Cc: linux-audit@redhat.com --- include/linux/security.h | 5 +++-- kernel/auditfilter.c | 6 ++++-- kernel/auditsc.c | 16 +++++++++++----- security/security.c | 5 +++-- 4 files changed, 21 insertions(+), 11 deletions(-) diff --git a/include/linux/security.h b/include/linux/security.h index ddd4cf48413c..d846d90f5624 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -1954,7 +1954,7 @@ static inline int security_key_getsecurity(struct key *key, char **_buffer) int security_audit_rule_init(u32 field, u32 op, char *rulestr, struct audit_rules *lsmrules); int security_audit_rule_known(struct audit_krule *krule); -int security_audit_rule_match(u32 secid, u32 field, u32 op, +int security_audit_rule_match(struct lsmblob *blob, u32 field, u32 op, struct audit_rules *lsmrules); void security_audit_rule_free(struct audit_rules *lsmrules); @@ -1971,7 +1971,8 @@ 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, +static inline int security_audit_rule_match(struct lsmblob *blob secid, + u32 field, u32 op, struct audit_rules *lsmrules) { return 0; diff --git a/kernel/auditfilter.c b/kernel/auditfilter.c index db427e136368..ffbd8396bdc9 100644 --- a/kernel/auditfilter.c +++ b/kernel/auditfilter.c @@ -1338,6 +1338,7 @@ 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 lsmblob blob; pid_t pid; u32 sid; @@ -1371,8 +1372,9 @@ int audit_filter(int msgtype, unsigned int listtype) if (f->lsm_isset) { security_task_getsecid_subj(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 1aa8ffdae0ad..de22e852373a 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -468,6 +468,7 @@ 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; if (ctx && rule->prio <= ctx->prio) @@ -669,8 +670,10 @@ static int audit_filter_rules(struct task_struct *tsk, security_task_getsecid_subj(tsk, &sid); need_sid = 0; } - result = security_audit_rule_match(sid, f->type, - f->op, &f->lsm_rules); + lsmblob_init(&blob, sid); + result = security_audit_rule_match(&blob, + f->type, f->op, + &f->lsm_rules); } break; case AUDIT_OBJ_USER: @@ -683,15 +686,17 @@ 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, n->osid); if (security_audit_rule_match( - n->osid, f->type, f->op, + &blob, f->type, f->op, &f->lsm_rules)) { ++result; break; @@ -701,7 +706,8 @@ 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/security.c b/security/security.c index c472cac72641..238541218ca5 100644 --- a/security/security.c +++ b/security/security.c @@ -2680,7 +2680,7 @@ void security_audit_rule_free(struct audit_rules *lsmrules) } } -int security_audit_rule_match(u32 secid, u32 field, u32 op, +int security_audit_rule_match(struct lsmblob *blob, u32 field, u32 op, struct audit_rules *lsmrules) { struct security_hook_list *hp; @@ -2691,7 +2691,8 @@ int security_audit_rule_match(u32 secid, u32 field, u32 op, continue; if (lsmrules->rule[hp->lsmid->slot] == NULL) continue; - rc = hp->hook.audit_rule_match(secid, field, op, + rc = hp->hook.audit_rule_match(blob->secid[hp->lsmid->slot], + field, op, &lsmrules->rule[hp->lsmid->slot]); if (rc) return rc; -- 2.31.1 -- Linux-audit mailing list Linux-audit@redhat.com https://listman.redhat.com/mailman/listinfo/linux-audit