[PATCH] add rule filterkey

[linux-block.git] / kernel / auditsc.c

diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index dc5e3f01efe747c9d1816895ae1a1e40fb527489..316657855165d8e7c38104c3bc2f62e436d942c4 100644 (file)
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -186,6 +186,7 @@ struct audit_context {
        int                 auditable;  /* 1 if record should be written */
        int                 name_count;
        struct audit_names  names[AUDIT_NAMES];
+       char *              filterkey;  /* key for rule that triggered record */
        struct dentry *     pwd;
        struct vfsmount *   pwdmnt;
        struct audit_context *previous; /* For nested syscalls */
@@ -348,11 +349,17 @@ static int audit_filter_rules(struct task_struct *tsk,
                        if (ctx)
                                result = audit_comparator(ctx->argv[f->type-AUDIT_ARG0], f->op, f->val);
                        break;
+               case AUDIT_FILTERKEY:
+                       /* ignore this field for filtering */
+                       result = 1;
+                       break;
                }
 
                if (!result)
                        return 0;
        }
+       if (rule->filterkey)
+               ctx->filterkey = kstrdup(rule->filterkey, GFP_ATOMIC);
        switch (rule->action) {
        case AUDIT_NEVER:    *state = AUDIT_DISABLED;       break;
        case AUDIT_ALWAYS:   *state = AUDIT_RECORD_CONTEXT; break;
@@ -627,6 +634,7 @@ static inline void audit_free_context(struct audit_context *context)
                }
                audit_free_names(context);
                audit_free_aux(context);
+               kfree(context->filterkey);
                kfree(context);
                context  = previous;
        } while (context);
@@ -735,6 +743,11 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
                  context->euid, context->suid, context->fsuid,
                  context->egid, context->sgid, context->fsgid, tty);
        audit_log_task_info(ab, tsk);
+       if (context->filterkey) {
+               audit_log_format(ab, " key=");
+               audit_log_untrustedstring(ab, context->filterkey);
+       } else
+               audit_log_format(ab, " key=(null)");
        audit_log_end(ab);
 
        for (aux = context->aux; aux; aux = aux->next) {
@@ -1060,6 +1073,8 @@ void audit_syscall_exit(int valid, long return_code)
        } else {
                audit_free_names(context);
                audit_free_aux(context);
+               kfree(context->filterkey);
+               context->filterkey = NULL;
                tsk->audit_context = context;
        }
 }