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2023-12-11 1f93a7dfd1f8d5ff7a5c53246c7534fe2332d6f4

 kernel/samples/bpf/tracex5_user.c
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@@ -1,13 +1,20 @@
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 // SPDX-License-Identifier: GPL-2.0
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 #include <stdio.h>
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-#include <linux/bpf.h>
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+#include <stdlib.h>
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 #include <unistd.h>
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 #include <linux/filter.h>
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 #include <linux/seccomp.h>
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 #include <sys/prctl.h>
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 #include <bpf/bpf.h>
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-#include "bpf_load.h"
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+#include <bpf/libbpf.h>
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 #include <sys/resource.h>
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+#include "trace_helpers.h"
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+
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+#ifdef __mips__
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+#define	MAX_ENTRIES  6000 /* MIPS n64 syscalls start at 5000 */
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+#else
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+#define	MAX_ENTRIES  1024
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+#endif
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 /* install fake seccomp program to enable seccomp code path inside the kernel,
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  * so that our kprobe attached to seccomp_phase1() can be triggered
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@@ -27,16 +34,57 @@
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34
 
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 int main(int ac, char **argv)
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 {
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-	FILE *f;
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-	char filename[256];
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 	struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
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+	struct bpf_link *link = NULL;
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+	struct bpf_program *prog;
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+	struct bpf_object *obj;
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+	int key, fd, progs_fd;
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+	const char *section;
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+	char filename[256];
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+	FILE *f;
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-	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
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 	setrlimit(RLIMIT_MEMLOCK, &r);
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-	if (load_bpf_file(filename)) {
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-		printf("%s", bpf_log_buf);
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-		return 1;
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+	snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
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+	obj = bpf_object__open_file(filename, NULL);
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+	if (libbpf_get_error(obj)) {
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+		fprintf(stderr, "ERROR: opening BPF object file failed\n");
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+		return 0;
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+	}
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+
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+	prog = bpf_object__find_program_by_name(obj, "bpf_prog1");
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+	if (!prog) {
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+		printf("finding a prog in obj file failed\n");
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+		goto cleanup;
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+	}
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+
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+	/* load BPF program */
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+	if (bpf_object__load(obj)) {
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+		fprintf(stderr, "ERROR: loading BPF object file failed\n");
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+		goto cleanup;
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+	}
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+
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+	link = bpf_program__attach(prog);
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+	if (libbpf_get_error(link)) {
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+		fprintf(stderr, "ERROR: bpf_program__attach failed\n");
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+		link = NULL;
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+		goto cleanup;
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+	}
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+
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+	progs_fd = bpf_object__find_map_fd_by_name(obj, "progs");
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+	if (progs_fd < 0) {
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+		fprintf(stderr, "ERROR: finding a map in obj file failed\n");
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+		goto cleanup;
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+	}
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+
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+	bpf_object__for_each_program(prog, obj) {
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+		section = bpf_program__section_name(prog);
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+		/* register only syscalls to PROG_ARRAY */
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+		if (sscanf(section, "kprobe/%d", &key) != 1)
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+			continue;
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+
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+		fd = bpf_program__fd(prog);
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+		bpf_map_update_elem(progs_fd, &key, &fd, BPF_ANY);
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 	}
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 	install_accept_all_seccomp();
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@@ -46,5 +94,8 @@
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 	read_trace_pipe();
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96
 
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+cleanup:
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+	bpf_link__destroy(link);
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+	bpf_object__close(obj);
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 	return 0;
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 }