tracex5_user.c (68f0f2690e183306b52671a9ad09fb31808b0500) tracex5_user.c (bc1a85977b950407d67cd1e5b74f261a4bee3284)
1// SPDX-License-Identifier: GPL-2.0
2#include <stdio.h>
1// SPDX-License-Identifier: GPL-2.0
2#include <stdio.h>
3#include <linux/bpf.h>
3#include <stdlib.h>
4#include <unistd.h>
5#include <linux/filter.h>
6#include <linux/seccomp.h>
7#include <sys/prctl.h>
8#include <bpf/bpf.h>
4#include <unistd.h>
5#include <linux/filter.h>
6#include <linux/seccomp.h>
7#include <sys/prctl.h>
8#include <bpf/bpf.h>
9#include "bpf_load.h"
9#include <bpf/libbpf.h>
10#include <sys/resource.h>
11#include "trace_helpers.h"
12
10#include <sys/resource.h>
11#include "trace_helpers.h"
12
13#ifdef __mips__
14#define MAX_ENTRIES 6000 /* MIPS n64 syscalls start at 5000 */
15#else
16#define MAX_ENTRIES 1024
17#endif
18
13/* install fake seccomp program to enable seccomp code path inside the kernel,
14 * so that our kprobe attached to seccomp_phase1() can be triggered
15 */
16static void install_accept_all_seccomp(void)
17{
18 struct sock_filter filter[] = {
19 BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_ALLOW),
20 };
21 struct sock_fprog prog = {
22 .len = (unsigned short)(sizeof(filter)/sizeof(filter[0])),
23 .filter = filter,
24 };
25 if (prctl(PR_SET_SECCOMP, 2, &prog))
26 perror("prctl");
27}
28
29int main(int ac, char **argv)
30{
19/* install fake seccomp program to enable seccomp code path inside the kernel,
20 * so that our kprobe attached to seccomp_phase1() can be triggered
21 */
22static void install_accept_all_seccomp(void)
23{
24 struct sock_filter filter[] = {
25 BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_ALLOW),
26 };
27 struct sock_fprog prog = {
28 .len = (unsigned short)(sizeof(filter)/sizeof(filter[0])),
29 .filter = filter,
30 };
31 if (prctl(PR_SET_SECCOMP, 2, &prog))
32 perror("prctl");
33}
34
35int main(int ac, char **argv)
36{
31 FILE *f;
32 char filename[256];
33 struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
37 struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
38 struct bpf_link *link = NULL;
39 struct bpf_program *prog;
40 struct bpf_object *obj;
41 int key, fd, progs_fd;
42 char filename[256];
43 const char *title;
44 FILE *f;
34
45
35 snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
36 setrlimit(RLIMIT_MEMLOCK, &r);
37
46 setrlimit(RLIMIT_MEMLOCK, &r);
47
38 if (load_bpf_file(filename)) {
39 printf("%s", bpf_log_buf);
40 return 1;
48 snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
49 obj = bpf_object__open_file(filename, NULL);
50 if (libbpf_get_error(obj)) {
51 fprintf(stderr, "ERROR: opening BPF object file failed\n");
52 return 0;
41 }
42
53 }
54
55 prog = bpf_object__find_program_by_name(obj, "bpf_prog1");
56 if (!prog) {
57 printf("finding a prog in obj file failed\n");
58 goto cleanup;
59 }
60
61 /* load BPF program */
62 if (bpf_object__load(obj)) {
63 fprintf(stderr, "ERROR: loading BPF object file failed\n");
64 goto cleanup;
65 }
66
67 link = bpf_program__attach(prog);
68 if (libbpf_get_error(link)) {
69 fprintf(stderr, "ERROR: bpf_program__attach failed\n");
70 link = NULL;
71 goto cleanup;
72 }
73
74 progs_fd = bpf_object__find_map_fd_by_name(obj, "progs");
75 if (progs_fd < 0) {
76 fprintf(stderr, "ERROR: finding a map in obj file failed\n");
77 goto cleanup;
78 }
79
80 bpf_object__for_each_program(prog, obj) {
81 title = bpf_program__title(prog, false);
82 /* register only syscalls to PROG_ARRAY */
83 if (sscanf(title, "kprobe/%d", &key) != 1)
84 continue;
85
86 fd = bpf_program__fd(prog);
87 bpf_map_update_elem(progs_fd, &key, &fd, BPF_ANY);
88 }
89
43 install_accept_all_seccomp();
44
45 f = popen("dd if=/dev/zero of=/dev/null count=5", "r");
46 (void) f;
47
48 read_trace_pipe();
49
90 install_accept_all_seccomp();
91
92 f = popen("dd if=/dev/zero of=/dev/null count=5", "r");
93 (void) f;
94
95 read_trace_pipe();
96
97cleanup:
98 bpf_link__destroy(link);
99 bpf_object__close(obj);
50 return 0;
51}
100 return 0;
101}