// SPDX-License-Identifier: GPL-2.0#include <stdio.h>#include <stdlib.h>#include <unistd.h>#include <linux/filter.h>#include <linux/seccomp.h>#include <sys/prctl.h>#include <bpf/bpf.h>#include <bpf/libbpf.h>#include "trace_helpers.h"#include "bpf_util.h" #ifdef __mips__#define	MAX_ENTRIES  6000 /* MIPS n64 syscalls start at 5000 */#else#define	MAX_ENTRIES  1024#endif /* install fake seccomp program to enable seccomp code path inside the kernel, * so that our kprobe attached to seccomp_phase1() can be triggered */static void install_accept_all_seccomp(void){	struct sock_filter filter[] = {		BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_ALLOW),	};	struct sock_fprog prog = {		.len = (unsigned short)ARRAY_SIZE(filter),		.filter = filter,	};	if (prctl(PR_SET_SECCOMP, 2, &prog))		perror("prctl");} int main(int ac, char **argv){	struct bpf_link *link = NULL;	struct bpf_program *prog;	struct bpf_object *obj;	int key, fd, progs_fd;	const char *section;	char filename[256];	FILE *f; 	snprintf(filename, sizeof(filename), "%s.bpf.o", argv[0]);	obj = bpf_object__open_file(filename, NULL);	if (libbpf_get_error(obj)) {		fprintf(stderr, "ERROR: opening BPF object file failed\n");		return 0;	} 	prog = bpf_object__find_program_by_name(obj, "bpf_prog1");	if (!prog) {		printf("finding a prog in obj file failed\n");		goto cleanup;	} 	/* load BPF program */	if (bpf_object__load(obj)) {		fprintf(stderr, "ERROR: loading BPF object file failed\n");		goto cleanup;	} 	link = bpf_program__attach(prog);	if (libbpf_get_error(link)) {		fprintf(stderr, "ERROR: bpf_program__attach failed\n");		link = NULL;		goto cleanup;	} 	progs_fd = bpf_object__find_map_fd_by_name(obj, "progs");	if (progs_fd < 0) {		fprintf(stderr, "ERROR: finding a map in obj file failed\n");		goto cleanup;	} 	bpf_object__for_each_program(prog, obj) {		section = bpf_program__section_name(prog);		/* register only syscalls to PROG_ARRAY */		if (sscanf(section, "kprobe/%d", &key) != 1)			continue; 		fd = bpf_program__fd(prog);		bpf_map_update_elem(progs_fd, &key, &fd, BPF_ANY);	} 	install_accept_all_seccomp(); 	f = popen("dd if=/dev/zero of=/dev/null count=5", "r");	(void) f; 	read_trace_pipe(); cleanup:	bpf_link__destroy(link);	bpf_object__close(obj);	return 0;}