raw_tp_writable_reject_nbd_invalid.c

 1// SPDX-License-Identifier: GPL-2.0
 2
 3#include <test_progs.h>
 4#include <linux/nbd.h>
 5#include "bpf_util.h"
 6
 7void test_raw_tp_writable_reject_nbd_invalid(void)
 8{
 9	__u32 duration = 0;
10	char error[4096];
11	int bpf_fd = -1, tp_fd = -1;
12
13	const struct bpf_insn program[] = {
14		/* r6 is our tp buffer */
15		BPF_LDX_MEM(BPF_DW, BPF_REG_6, BPF_REG_1, 0),
16		/* one byte beyond the end of the nbd_request struct */
17		BPF_LDX_MEM(BPF_B, BPF_REG_0, BPF_REG_6,
18			    sizeof(struct nbd_request)),
19		BPF_EXIT_INSN(),
20	};
21
22	LIBBPF_OPTS(bpf_prog_load_opts, opts,
23		.log_level = 2,
24		.log_buf = error,
25		.log_size = sizeof(error),
26	);
27
28	bpf_fd = bpf_prog_load(BPF_PROG_TYPE_RAW_TRACEPOINT_WRITABLE, NULL, "GPL v2",
29			       program, ARRAY_SIZE(program),
30			       &opts);
31	if (CHECK(bpf_fd < 0, "bpf_raw_tracepoint_writable load",
32		  "failed: %d errno %d\n", bpf_fd, errno))
33		return;
34
35	tp_fd = bpf_raw_tracepoint_open("nbd_send_request", bpf_fd);
36	if (CHECK(tp_fd >= 0, "bpf_raw_tracepoint_writable open",
37		  "erroneously succeeded\n"))
38		goto out_bpffd;
39
40	close(tp_fd);
41out_bpffd:
42	close(bpf_fd);
43}