Commit 1cd0e771 authored by Yafang Shao's avatar Yafang Shao Committed by Alexei Starovoitov
Browse files

selftests/bpf: Add selftest for PTR_UNTRUSTED 



Add a new selftest to check the PTR_UNTRUSTED condition. Below is the
result,

 #160     ptr_untrusted:OK

Signed-off-by: default avatarYafang Shao <laoar.shao@gmail.com>
Link: https://lore.kernel.org/r/20230713025642.27477-5-laoar.shao@gmail.com


Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent 33937607

tools/testing/selftests/bpf/prog_tests/ptr_untrusted.c

0 → 100644
+36 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/* Copyright (C) 2023 Yafang Shao <laoar.shao@gmail.com> */



#include <string.h>

#include <linux/bpf.h>

#include <test_progs.h>

#include "test_ptr_untrusted.skel.h"



#define TP_NAME "sched_switch"



void serial_test_ptr_untrusted(void)

{

	struct test_ptr_untrusted *skel;

	int err;



	skel = test_ptr_untrusted__open_and_load();

	if (!ASSERT_OK_PTR(skel, "skel_open"))

		goto cleanup;



	/* First, attach lsm prog */

	skel->links.lsm_run = bpf_program__attach_lsm(skel->progs.lsm_run);

	if (!ASSERT_OK_PTR(skel->links.lsm_run, "lsm_attach"))

		goto cleanup;



	/* Second, attach raw_tp prog. The lsm prog will be triggered. */

	skel->links.raw_tp_run = bpf_program__attach_raw_tracepoint(skel->progs.raw_tp_run,

								    TP_NAME);

	if (!ASSERT_OK_PTR(skel->links.raw_tp_run, "raw_tp_attach"))

		goto cleanup;



	err = strncmp(skel->bss->tp_name, TP_NAME, strlen(TP_NAME));

	ASSERT_EQ(err, 0, "cmp_tp_name");



cleanup:

	test_ptr_untrusted__destroy(skel);

}

tools/testing/selftests/bpf/progs/test_ptr_untrusted.c

0 → 100644
+29 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/* Copyright (C) 2023 Yafang Shao <laoar.shao@gmail.com> */



#include "vmlinux.h"

#include <bpf/bpf_tracing.h>



char tp_name[128];



SEC("lsm/bpf")

int BPF_PROG(lsm_run, int cmd, union bpf_attr *attr, unsigned int size)

{

	switch (cmd) {

	case BPF_RAW_TRACEPOINT_OPEN:

		bpf_probe_read_user_str(tp_name, sizeof(tp_name) - 1,

					(void *)attr->raw_tracepoint.name);

		break;

	default:

		break;

	}

	return 0;

}



SEC("raw_tracepoint")

int BPF_PROG(raw_tp_run)

{

	return 0;

}



char _license[] SEC("license") = "GPL";