^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) #include <stdio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) #include <stdlib.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) #include <unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) #include <linux/filter.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) #include <linux/seccomp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <sys/prctl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <bpf/bpf.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <bpf/libbpf.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <sys/resource.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include "trace_helpers.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #ifdef __mips__
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #define MAX_ENTRIES 6000 /* MIPS n64 syscalls start at 5000 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #define MAX_ENTRIES 1024
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) /* install fake seccomp program to enable seccomp code path inside the kernel,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * so that our kprobe attached to seccomp_phase1() can be triggered
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) static void install_accept_all_seccomp(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) struct sock_filter filter[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) BPF_STMT(BPF_RET+BPF_K, SECCOMP_RET_ALLOW),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) struct sock_fprog prog = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) .len = (unsigned short)(sizeof(filter)/sizeof(filter[0])),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) .filter = filter,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) if (prctl(PR_SET_SECCOMP, 2, &prog))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) perror("prctl");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) int main(int ac, char **argv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) struct bpf_link *link = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) struct bpf_program *prog;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) struct bpf_object *obj;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) int key, fd, progs_fd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) const char *section;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) char filename[256];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) FILE *f;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) setrlimit(RLIMIT_MEMLOCK, &r);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) obj = bpf_object__open_file(filename, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) if (libbpf_get_error(obj)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) fprintf(stderr, "ERROR: opening BPF object file failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) prog = bpf_object__find_program_by_name(obj, "bpf_prog1");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) if (!prog) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) printf("finding a prog in obj file failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) goto cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) /* load BPF program */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) if (bpf_object__load(obj)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) fprintf(stderr, "ERROR: loading BPF object file failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) goto cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) link = bpf_program__attach(prog);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) if (libbpf_get_error(link)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) fprintf(stderr, "ERROR: bpf_program__attach failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) link = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) goto cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) progs_fd = bpf_object__find_map_fd_by_name(obj, "progs");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) if (progs_fd < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) fprintf(stderr, "ERROR: finding a map in obj file failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) goto cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) bpf_object__for_each_program(prog, obj) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) section = bpf_program__section_name(prog);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) /* register only syscalls to PROG_ARRAY */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) if (sscanf(section, "kprobe/%d", &key) != 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) fd = bpf_program__fd(prog);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) bpf_map_update_elem(progs_fd, &key, &fd, BPF_ANY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) install_accept_all_seccomp();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) f = popen("dd if=/dev/zero of=/dev/null count=5", "r");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) (void) f;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) read_trace_pipe();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) cleanup:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) bpf_link__destroy(link);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) bpf_object__close(obj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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