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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Verify that context-sensitive SCX kfuncs (even "unlocked" ones) are
* restricted to only SCX struct_ops programs. Non-SCX struct_ops programs,
* such as TCP congestion control programs, should be rejected by the BPF
* verifier when attempting to call these kfuncs.
*
* Copyright (C) 2026 Ching-Chun (Jim) Huang <jserv@ccns.ncku.edu.tw>
* Copyright (C) 2026 Cheng-Yang Chou <yphbchou0911@gmail.com>
*/
#include <bpf/bpf.h>
#include <scx/common.h>
#include <unistd.h>
#include <errno.h>
#include <stdio.h>
#include "non_scx_kfunc_deny.bpf.skel.h"
#include "scx_test.h"
static enum scx_test_status run(void *ctx)
{
struct non_scx_kfunc_deny *skel;
int err;
skel = non_scx_kfunc_deny__open();
if (!skel) {
SCX_ERR("Failed to open skel");
return SCX_TEST_FAIL;
}
err = non_scx_kfunc_deny__load(skel);
non_scx_kfunc_deny__destroy(skel);
if (err == 0) {
SCX_ERR("non-SCX BPF program loaded when it should have been rejected");
return SCX_TEST_FAIL;
}
return SCX_TEST_PASS;
}
struct scx_test non_scx_kfunc_deny = {
.name = "non_scx_kfunc_deny",
.description = "Verify that non-SCX struct_ops programs cannot call SCX kfuncs",
.run = run,
};
REGISTER_SCX_TEST(&non_scx_kfunc_deny)
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