// SPDX-License-Identifier: GPL-2.0
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#define _GNU_SOURCE
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#include <pthread.h>
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#include <sched.h>
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#include <sys/socket.h>
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#include <test_progs.h>
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#define MAX_CNT_RAWTP 10ull
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#define MAX_STACK_RAWTP 100
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static int duration = 0;
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struct get_stack_trace_t {
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int pid;
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int kern_stack_size;
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int user_stack_size;
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int user_stack_buildid_size;
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__u64 kern_stack[MAX_STACK_RAWTP];
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__u64 user_stack[MAX_STACK_RAWTP];
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struct bpf_stack_build_id user_stack_buildid[MAX_STACK_RAWTP];
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};
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static void get_stack_print_output(void *ctx, int cpu, void *data, __u32 size)
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{
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bool good_kern_stack = false, good_user_stack = false;
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const char *nonjit_func = "___bpf_prog_run";
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struct get_stack_trace_t *e = data;
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int i, num_stack;
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static __u64 cnt;
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struct ksym *ks;
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cnt++;
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if (size < sizeof(struct get_stack_trace_t)) {
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__u64 *raw_data = data;
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bool found = false;
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num_stack = size / sizeof(__u64);
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/* If jit is enabled, we do not have a good way to
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* verify the sanity of the kernel stack. So we
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* just assume it is good if the stack is not empty.
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* This could be improved in the future.
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*/
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if (env.jit_enabled) {
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found = num_stack > 0;
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} else {
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for (i = 0; i < num_stack; i++) {
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ks = ksym_search(raw_data[i]);
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if (ks && (strcmp(ks->name, nonjit_func) == 0)) {
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found = true;
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break;
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}
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}
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}
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if (found) {
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good_kern_stack = true;
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good_user_stack = true;
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}
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} else {
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num_stack = e->kern_stack_size / sizeof(__u64);
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if (env.jit_enabled) {
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good_kern_stack = num_stack > 0;
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} else {
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for (i = 0; i < num_stack; i++) {
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ks = ksym_search(e->kern_stack[i]);
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if (ks && (strcmp(ks->name, nonjit_func) == 0)) {
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good_kern_stack = true;
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break;
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}
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}
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}
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if (e->user_stack_size > 0 && e->user_stack_buildid_size > 0)
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good_user_stack = true;
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}
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if (!good_kern_stack)
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CHECK(!good_kern_stack, "kern_stack", "corrupted kernel stack\n");
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if (!good_user_stack)
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CHECK(!good_user_stack, "user_stack", "corrupted user stack\n");
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}
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void test_get_stack_raw_tp(void)
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{
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const char *file = "./test_get_stack_rawtp.o";
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const char *file_err = "./test_get_stack_rawtp_err.o";
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const char *prog_name = "raw_tracepoint/sys_enter";
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int i, err, prog_fd, exp_cnt = MAX_CNT_RAWTP;
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struct perf_buffer_opts pb_opts = {};
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struct perf_buffer *pb = NULL;
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struct bpf_link *link = NULL;
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struct timespec tv = {0, 10};
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struct bpf_program *prog;
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struct bpf_object *obj;
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struct bpf_map *map;
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cpu_set_t cpu_set;
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err = bpf_prog_load(file_err, BPF_PROG_TYPE_RAW_TRACEPOINT, &obj, &prog_fd);
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if (CHECK(err >= 0, "prog_load raw tp", "err %d errno %d\n", err, errno))
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return;
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err = bpf_prog_load(file, BPF_PROG_TYPE_RAW_TRACEPOINT, &obj, &prog_fd);
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if (CHECK(err, "prog_load raw tp", "err %d errno %d\n", err, errno))
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return;
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prog = bpf_object__find_program_by_title(obj, prog_name);
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if (CHECK(!prog, "find_probe", "prog '%s' not found\n", prog_name))
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goto close_prog;
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map = bpf_object__find_map_by_name(obj, "perfmap");
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if (CHECK(!map, "bpf_find_map", "not found\n"))
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goto close_prog;
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err = load_kallsyms();
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if (CHECK(err < 0, "load_kallsyms", "err %d errno %d\n", err, errno))
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goto close_prog;
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CPU_ZERO(&cpu_set);
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CPU_SET(0, &cpu_set);
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err = pthread_setaffinity_np(pthread_self(), sizeof(cpu_set), &cpu_set);
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if (CHECK(err, "set_affinity", "err %d, errno %d\n", err, errno))
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goto close_prog;
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link = bpf_program__attach_raw_tracepoint(prog, "sys_enter");
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if (CHECK(IS_ERR(link), "attach_raw_tp", "err %ld\n", PTR_ERR(link)))
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goto close_prog;
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pb_opts.sample_cb = get_stack_print_output;
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pb = perf_buffer__new(bpf_map__fd(map), 8, &pb_opts);
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if (CHECK(IS_ERR(pb), "perf_buf__new", "err %ld\n", PTR_ERR(pb)))
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goto close_prog;
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/* trigger some syscall action */
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for (i = 0; i < MAX_CNT_RAWTP; i++)
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nanosleep(&tv, NULL);
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while (exp_cnt > 0) {
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err = perf_buffer__poll(pb, 100);
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if (err < 0 && CHECK(err < 0, "pb__poll", "err %d\n", err))
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goto close_prog;
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exp_cnt -= err;
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}
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close_prog:
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if (!IS_ERR_OR_NULL(link))
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bpf_link__destroy(link);
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if (!IS_ERR_OR_NULL(pb))
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perf_buffer__free(pb);
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bpf_object__close(obj);
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}
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