Quelle  fill_link_info.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) 2023 Yafang Shao <laoar.shao@gmail.com> */

#include <string.h>
#include <linux/bpf.h>
#include <linux/limits.h>
#include <test_progs.h>
#include "trace_helpers.h"
#include "test_fill_link_info.skel.h"
#include "bpf/libbpf_internal.h"

#define TP_CAT "sched"
#define TP_NAME "sched_switch"

static const char *kmulti_syms[] = {
 "bpf_fentry_test2",
 "bpf_fentry_test1",
 "bpf_fentry_test3",
};
#define KMULTI_CNT ARRAY_SIZE(kmulti_syms)
static __u64 kmulti_addrs[KMULTI_CNT];
static __u64 kmulti_cookies[] = { 3, 1, 2 };

#define KPROBE_FUNC "bpf_fentry_test1"
static __u64 kprobe_addr;

#define UPROBE_FILE "/proc/self/exe"
static ssize_t uprobe_offset;
/* uprobe attach point */
static noinline void uprobe_func(void)
{
 asm volatile ("");
}

#define PERF_EVENT_COOKIE 0xdeadbeef

static int verify_perf_link_info(int fd, enum bpf_perf_event_type type, long addr,
     ssize_t offset, ssize_t entry_offset)
{
 ssize_t ref_ctr_offset = entry_offset /* ref_ctr_offset for uprobes */;
 struct bpf_link_info info;
 __u32 len = sizeof(info);
 char buf[PATH_MAX];
 int err;

 memset(&info, 0, sizeof(info));
 buf[0] = '\0';

again:
 err = bpf_link_get_info_by_fd(fd, &info, &len);
 if (!ASSERT_OK(err, "get_link_info"))
  return -1;

 if (!ASSERT_EQ(info.type, BPF_LINK_TYPE_PERF_EVENT, "link_type"))
  return -1;
 if (!ASSERT_EQ(info.perf_event.type, type, "perf_type_match"))
  return -1;

 switch (info.perf_event.type) {
 case BPF_PERF_EVENT_KPROBE:
 case BPF_PERF_EVENT_KRETPROBE:
  ASSERT_EQ(info.perf_event.kprobe.offset, offset, "kprobe_offset");

  /* In case kernel.kptr_restrict is not permitted or MAX_SYMS is reached */
  if (addr)
   ASSERT_EQ(info.perf_event.kprobe.addr, addr + entry_offset,
      "kprobe_addr");

  ASSERT_EQ(info.perf_event.kprobe.cookie, PERF_EVENT_COOKIE, "kprobe_cookie");

  ASSERT_EQ(info.perf_event.kprobe.name_len, strlen(KPROBE_FUNC) + 1,
      "name_len");
  if (!info.perf_event.kprobe.func_name) {
   info.perf_event.kprobe.func_name = ptr_to_u64(&buf);
   info.perf_event.kprobe.name_len = sizeof(buf);
   goto again;
  }

  err = strncmp(u64_to_ptr(info.perf_event.kprobe.func_name), KPROBE_FUNC,
         strlen(KPROBE_FUNC));
  ASSERT_EQ(err, 0, "cmp_kprobe_func_name");
  break;
 case BPF_PERF_EVENT_TRACEPOINT:
  ASSERT_EQ(info.perf_event.tracepoint.name_len, strlen(TP_NAME) + 1,
      "name_len");
  if (!info.perf_event.tracepoint.tp_name) {
   info.perf_event.tracepoint.tp_name = ptr_to_u64(&buf);
   info.perf_event.tracepoint.name_len = sizeof(buf);
   goto again;
  }

  ASSERT_EQ(info.perf_event.tracepoint.cookie, PERF_EVENT_COOKIE, "tracepoint_cookie");

  err = strncmp(u64_to_ptr(info.perf_event.tracepoint.tp_name), TP_NAME,
         strlen(TP_NAME));
  ASSERT_EQ(err, 0, "cmp_tp_name");
  break;
 case BPF_PERF_EVENT_UPROBE:
 case BPF_PERF_EVENT_URETPROBE:
  ASSERT_EQ(info.perf_event.uprobe.offset, offset, "uprobe_offset");
  ASSERT_EQ(info.perf_event.uprobe.ref_ctr_offset, ref_ctr_offset, "uprobe_ref_ctr_offset");

  ASSERT_EQ(info.perf_event.uprobe.name_len, strlen(UPROBE_FILE) + 1,
      "name_len");
  if (!info.perf_event.uprobe.file_name) {
   info.perf_event.uprobe.file_name = ptr_to_u64(&buf);
   info.perf_event.uprobe.name_len = sizeof(buf);
   goto again;
  }

  ASSERT_EQ(info.perf_event.uprobe.cookie, PERF_EVENT_COOKIE, "uprobe_cookie");

  err = strncmp(u64_to_ptr(info.perf_event.uprobe.file_name), UPROBE_FILE,
         strlen(UPROBE_FILE));
   ASSERT_EQ(err, 0, "cmp_file_name");
  break;
 case BPF_PERF_EVENT_EVENT:
  ASSERT_EQ(info.perf_event.event.type, PERF_TYPE_SOFTWARE, "event_type");
  ASSERT_EQ(info.perf_event.event.config, PERF_COUNT_SW_PAGE_FAULTS, "event_config");
  ASSERT_EQ(info.perf_event.event.cookie, PERF_EVENT_COOKIE, "event_cookie");
  break;
 default:
  err = -1;
  break;
 }
 return err;
}

static void kprobe_fill_invalid_user_buffer(int fd)
{
 struct bpf_link_info info;
 __u32 len = sizeof(info);
 int err;

 memset(&info, 0, sizeof(info));

 info.perf_event.kprobe.func_name = 0x1; /* invalid address */
 err = bpf_link_get_info_by_fd(fd, &info, &len);
 ASSERT_EQ(err, -EINVAL, "invalid_buff_and_len");

 info.perf_event.kprobe.name_len = 64;
 err = bpf_link_get_info_by_fd(fd, &info, &len);
 ASSERT_EQ(err, -EFAULT, "invalid_buff");

 info.perf_event.kprobe.func_name = 0;
 err = bpf_link_get_info_by_fd(fd, &info, &len);
 ASSERT_EQ(err, -EINVAL, "invalid_len");

 ASSERT_EQ(info.perf_event.kprobe.addr, 0, "func_addr");
 ASSERT_EQ(info.perf_event.kprobe.offset, 0, "func_offset");
 ASSERT_EQ(info.perf_event.type, 0, "type");
}

static void test_kprobe_fill_link_info(struct test_fill_link_info *skel,
           enum bpf_perf_event_type type,
           bool invalid)
{
 DECLARE_LIBBPF_OPTS(bpf_kprobe_opts, opts,
  .attach_mode = PROBE_ATTACH_MODE_LINK,
  .retprobe = type == BPF_PERF_EVENT_KRETPROBE,
  .bpf_cookie = PERF_EVENT_COOKIE,
 );
 ssize_t entry_offset = 0;
 struct bpf_link *link;
 int link_fd, err;

 link = bpf_program__attach_kprobe_opts(skel->progs.kprobe_run, KPROBE_FUNC, &opts);
 if (!ASSERT_OK_PTR(link, "attach_kprobe"))
  return;

 link_fd = bpf_link__fd(link);
 if (!invalid) {
  /* See also arch_adjust_kprobe_addr(). */
  if (skel->kconfig->CONFIG_X86_KERNEL_IBT)
   entry_offset = 4;
  if (skel->kconfig->CONFIG_PPC64 &&
      skel->kconfig->CONFIG_KPROBES_ON_FTRACE &&
      !skel->kconfig->CONFIG_PPC_FTRACE_OUT_OF_LINE)
   entry_offset = 4;
  err = verify_perf_link_info(link_fd, type, kprobe_addr, 0, entry_offset);
  ASSERT_OK(err, "verify_perf_link_info");
 } else {
  kprobe_fill_invalid_user_buffer(link_fd);
 }
 bpf_link__destroy(link);
}

static void test_tp_fill_link_info(struct test_fill_link_info *skel)
{
 DECLARE_LIBBPF_OPTS(bpf_tracepoint_opts, opts,
  .bpf_cookie = PERF_EVENT_COOKIE,
 );
 struct bpf_link *link;
 int link_fd, err;

 link = bpf_program__attach_tracepoint_opts(skel->progs.tp_run, TP_CAT, TP_NAME, &opts);
 if (!ASSERT_OK_PTR(link, "attach_tp"))
  return;

 link_fd = bpf_link__fd(link);
 err = verify_perf_link_info(link_fd, BPF_PERF_EVENT_TRACEPOINT, 0, 0, 0);
 ASSERT_OK(err, "verify_perf_link_info");
 bpf_link__destroy(link);
}

static void test_event_fill_link_info(struct test_fill_link_info *skel)
{
 DECLARE_LIBBPF_OPTS(bpf_perf_event_opts, opts,
  .bpf_cookie = PERF_EVENT_COOKIE,
 );
 struct bpf_link *link;
 int link_fd, err, pfd;
 struct perf_event_attr attr = {
  .type = PERF_TYPE_SOFTWARE,
  .config = PERF_COUNT_SW_PAGE_FAULTS,
  .freq = 1,
  .sample_freq = 1,
  .size = sizeof(struct perf_event_attr),
 };

 pfd = syscall(__NR_perf_event_open, &attr, -1 /* pid */, 0 /* cpu 0 */,
        -1 /* group id */, 0 /* flags */);
 if (!ASSERT_GE(pfd, 0, "perf_event_open"))
  return;

 link = bpf_program__attach_perf_event_opts(skel->progs.event_run, pfd, &opts);
 if (!ASSERT_OK_PTR(link, "attach_event"))
  goto error;

 link_fd = bpf_link__fd(link);
 err = verify_perf_link_info(link_fd, BPF_PERF_EVENT_EVENT, 0, 0, 0);
 ASSERT_OK(err, "verify_perf_link_info");
 bpf_link__destroy(link);

error:
 close(pfd);
}

static void test_uprobe_fill_link_info(struct test_fill_link_info *skel,
           enum bpf_perf_event_type type)
{
 DECLARE_LIBBPF_OPTS(bpf_uprobe_opts, opts,
  .retprobe = type == BPF_PERF_EVENT_URETPROBE,
  .bpf_cookie = PERF_EVENT_COOKIE,
 );
 const char *sema[1] = {
  "uprobe_link_info_sema_1",
 };
 __u64 *ref_ctr_offset;
 struct bpf_link *link;
 int link_fd, err;

 err = elf_resolve_syms_offsets("/proc/self/exe", 1, sema,
           (unsigned long **) &ref_ctr_offset, STT_OBJECT);
 if (!ASSERT_OK(err, "elf_resolve_syms_offsets_object"))
  return;

 opts.ref_ctr_offset = *ref_ctr_offset;
 link = bpf_program__attach_uprobe_opts(skel->progs.uprobe_run,
            0, /* self pid */
            UPROBE_FILE, uprobe_offset,
            &opts);
 if (!ASSERT_OK_PTR(link, "attach_uprobe"))
  goto out;

 link_fd = bpf_link__fd(link);
 err = verify_perf_link_info(link_fd, type, 0, uprobe_offset, *ref_ctr_offset);
 ASSERT_OK(err, "verify_perf_link_info");
 bpf_link__destroy(link);
out:
 free(ref_ctr_offset);
}

static int verify_kmulti_link_info(int fd, bool retprobe, bool has_cookies)
{
 __u64 addrs[KMULTI_CNT], cookies[KMULTI_CNT];
 struct bpf_link_info info;
 __u32 len = sizeof(info);
 int flags, i, err;

 memset(&info, 0, sizeof(info));

again:
 err = bpf_link_get_info_by_fd(fd, &info, &len);
 if (!ASSERT_OK(err, "get_link_info"))
  return -1;

 if (!ASSERT_EQ(info.type, BPF_LINK_TYPE_KPROBE_MULTI, "kmulti_type"))
  return -1;

 ASSERT_EQ(info.kprobe_multi.count, KMULTI_CNT, "func_cnt");
 flags = info.kprobe_multi.flags & BPF_F_KPROBE_MULTI_RETURN;
 if (!retprobe)
  ASSERT_EQ(flags, 0, "kmulti_flags");
 else
  ASSERT_NEQ(flags, 0, "kretmulti_flags");

 if (!info.kprobe_multi.addrs) {
  info.kprobe_multi.addrs = ptr_to_u64(addrs);
  info.kprobe_multi.cookies = ptr_to_u64(cookies);
  goto again;
 }
 for (i = 0; i < KMULTI_CNT; i++) {
  ASSERT_EQ(addrs[i], kmulti_addrs[i], "kmulti_addrs");
  ASSERT_EQ(cookies[i], has_cookies ? kmulti_cookies[i] : 0,
     "kmulti_cookies_value");
 }
 return 0;
}

static void verify_kmulti_invalid_user_buffer(int fd)
{
 __u64 addrs[KMULTI_CNT], cookies[KMULTI_CNT];
 struct bpf_link_info info;
 __u32 len = sizeof(info);
 int err, i;

 memset(&info, 0, sizeof(info));

 info.kprobe_multi.count = KMULTI_CNT;
 err = bpf_link_get_info_by_fd(fd, &info, &len);
 ASSERT_EQ(err, -EINVAL, "no_addr");

 info.kprobe_multi.addrs = ptr_to_u64(addrs);
 info.kprobe_multi.count = 0;
 err = bpf_link_get_info_by_fd(fd, &info, &len);
 ASSERT_EQ(err, -EINVAL, "no_cnt");

 for (i = 0; i < KMULTI_CNT; i++)
  addrs[i] = 0;
 info.kprobe_multi.count = KMULTI_CNT - 1;
 err = bpf_link_get_info_by_fd(fd, &info, &len);
 ASSERT_EQ(err, -ENOSPC, "smaller_cnt");
 for (i = 0; i < KMULTI_CNT - 1; i++)
  ASSERT_EQ(addrs[i], kmulti_addrs[i], "kmulti_addrs");
 ASSERT_EQ(addrs[i], 0, "kmulti_addrs");

 for (i = 0; i < KMULTI_CNT; i++)
  addrs[i] = 0;
 info.kprobe_multi.count = KMULTI_CNT + 1;
 err = bpf_link_get_info_by_fd(fd, &info, &len);
 ASSERT_EQ(err, 0, "bigger_cnt");
 for (i = 0; i < KMULTI_CNT; i++)
  ASSERT_EQ(addrs[i], kmulti_addrs[i], "kmulti_addrs");

 info.kprobe_multi.count = KMULTI_CNT;
 info.kprobe_multi.addrs = 0x1; /* invalid addr */
 err = bpf_link_get_info_by_fd(fd, &info, &len);
 ASSERT_EQ(err, -EFAULT, "invalid_buff_addrs");

 info.kprobe_multi.count = KMULTI_CNT;
 info.kprobe_multi.addrs = ptr_to_u64(addrs);
 info.kprobe_multi.cookies = 0x1; /* invalid addr */
 err = bpf_link_get_info_by_fd(fd, &info, &len);
 ASSERT_EQ(err, -EFAULT, "invalid_buff_cookies");

 /* cookies && !count */
 info.kprobe_multi.count = 0;
 info.kprobe_multi.addrs = ptr_to_u64(NULL);
 info.kprobe_multi.cookies = ptr_to_u64(cookies);
 err = bpf_link_get_info_by_fd(fd, &info, &len);
 ASSERT_EQ(err, -EINVAL, "invalid_cookies_count");
}

static int symbols_cmp_r(const void *a, const void *b)
{
 const char **str_a = (const char **) a;
 const char **str_b = (const char **) b;

 return strcmp(*str_a, *str_b);
}

static void test_kprobe_multi_fill_link_info(struct test_fill_link_info *skel,
          bool retprobe, bool cookies,
          bool invalid)
{
 LIBBPF_OPTS(bpf_kprobe_multi_opts, opts);
 struct bpf_link *link;
 int link_fd, err;

 opts.syms = kmulti_syms;
 opts.cookies = cookies ? kmulti_cookies : NULL;
 opts.cnt = KMULTI_CNT;
 opts.retprobe = retprobe;
 link = bpf_program__attach_kprobe_multi_opts(skel->progs.kmulti_run, NULL, &opts);
 if (!ASSERT_OK_PTR(link, "attach_kprobe_multi"))
  return;

 link_fd = bpf_link__fd(link);
 if (!invalid) {
  err = verify_kmulti_link_info(link_fd, retprobe, cookies);
  ASSERT_OK(err, "verify_kmulti_link_info");
 } else {
  verify_kmulti_invalid_user_buffer(link_fd);
 }
 bpf_link__destroy(link);
}

#define SEC(name) __attribute__((section(name), used))

static short uprobe_link_info_sema_1 SEC(".probes");
static short uprobe_link_info_sema_2 SEC(".probes");
static short uprobe_link_info_sema_3 SEC(".probes");

noinline void uprobe_link_info_func_1(void)
{
 asm volatile ("");
 uprobe_link_info_sema_1++;
}

noinline void uprobe_link_info_func_2(void)
{
 asm volatile ("");
 uprobe_link_info_sema_2++;
}

noinline void uprobe_link_info_func_3(void)
{
 asm volatile ("");
 uprobe_link_info_sema_3++;
}

static int
verify_umulti_link_info(int fd, bool retprobe, __u64 *offsets,
   __u64 *cookies, __u64 *ref_ctr_offsets)
{
 char path[PATH_MAX], path_buf[PATH_MAX];
 struct bpf_link_info info;
 __u32 len = sizeof(info);
 __u64 ref_ctr_offsets_buf[3];
 __u64 offsets_buf[3];
 __u64 cookies_buf[3];
 int i, err, bit;
 __u32 count = 0;

 memset(path, 0, sizeof(path));
 err = readlink("/proc/self/exe", path, sizeof(path));
 if (!ASSERT_NEQ(err, -1, "readlink"))
  return -1;

 memset(&info, 0, sizeof(info));
 err = bpf_link_get_info_by_fd(fd, &info, &len);
 if (!ASSERT_OK(err, "bpf_link_get_info_by_fd"))
  return -1;

 ASSERT_EQ(info.uprobe_multi.count, 3, "info.uprobe_multi.count");
 ASSERT_EQ(info.uprobe_multi.path_size, strlen(path) + 1,
    "info.uprobe_multi.path_size");

 for (bit = 0; bit < 8; bit++) {
  memset(&info, 0, sizeof(info));
  info.uprobe_multi.path = ptr_to_u64(path_buf);
  info.uprobe_multi.path_size = sizeof(path_buf);
  info.uprobe_multi.count = count;

  if (bit & 0x1)
   info.uprobe_multi.offsets = ptr_to_u64(offsets_buf);
  if (bit & 0x2)
   info.uprobe_multi.cookies = ptr_to_u64(cookies_buf);
  if (bit & 0x4)
   info.uprobe_multi.ref_ctr_offsets = ptr_to_u64(ref_ctr_offsets_buf);

  err = bpf_link_get_info_by_fd(fd, &info, &len);
  if (!ASSERT_OK(err, "bpf_link_get_info_by_fd"))
   return -1;

  if (!ASSERT_EQ(info.type, BPF_LINK_TYPE_UPROBE_MULTI, "info.type"))
   return -1;

  ASSERT_EQ(info.uprobe_multi.pid, getpid(), "info.uprobe_multi.pid");
  ASSERT_EQ(info.uprobe_multi.count, 3, "info.uprobe_multi.count");
  ASSERT_EQ(info.uprobe_multi.flags & BPF_F_KPROBE_MULTI_RETURN,
     retprobe, "info.uprobe_multi.flags.retprobe");
  ASSERT_EQ(info.uprobe_multi.path_size, strlen(path) + 1, "info.uprobe_multi.path_size");
  ASSERT_STREQ(path_buf, path, "info.uprobe_multi.path");

  for (i = 0; i < info.uprobe_multi.count; i++) {
   if (info.uprobe_multi.offsets)
    ASSERT_EQ(offsets_buf[i], offsets[i], "info.uprobe_multi.offsets");
   if (info.uprobe_multi.cookies)
    ASSERT_EQ(cookies_buf[i], cookies[i], "info.uprobe_multi.cookies");
   if (info.uprobe_multi.ref_ctr_offsets) {
    ASSERT_EQ(ref_ctr_offsets_buf[i], ref_ctr_offsets[i],
       "info.uprobe_multi.ref_ctr_offsets");
   }
  }
  count = count ?: info.uprobe_multi.count;
 }

 return 0;
}

static void verify_umulti_invalid_user_buffer(int fd)
{
 struct bpf_link_info info;
 __u32 len = sizeof(info);
 __u64 buf[3];
 int err;

 /* upath_size defined, not path */
 memset(&info, 0, sizeof(info));
 info.uprobe_multi.path_size = 3;
 err = bpf_link_get_info_by_fd(fd, &info, &len);
 ASSERT_EQ(err, -EINVAL, "failed_upath_size");

 /* path defined, but small */
 memset(&info, 0, sizeof(info));
 info.uprobe_multi.path = ptr_to_u64(buf);
 info.uprobe_multi.path_size = 3;
 err = bpf_link_get_info_by_fd(fd, &info, &len);
 ASSERT_LT(err, 0, "failed_upath_small");

 /* path has wrong pointer */
 memset(&info, 0, sizeof(info));
 info.uprobe_multi.path_size = PATH_MAX;
 info.uprobe_multi.path = 123;
 err = bpf_link_get_info_by_fd(fd, &info, &len);
 ASSERT_EQ(err, -EFAULT, "failed_bad_path_ptr");

 /* count zero, with offsets */
 memset(&info, 0, sizeof(info));
 info.uprobe_multi.offsets = ptr_to_u64(buf);
 err = bpf_link_get_info_by_fd(fd, &info, &len);
 ASSERT_EQ(err, -EINVAL, "failed_count");

 /* offsets not big enough */
 memset(&info, 0, sizeof(info));
 info.uprobe_multi.offsets = ptr_to_u64(buf);
 info.uprobe_multi.count = 2;
 err = bpf_link_get_info_by_fd(fd, &info, &len);
 ASSERT_EQ(err, -ENOSPC, "failed_small_count");

 /* offsets has wrong pointer */
 memset(&info, 0, sizeof(info));
 info.uprobe_multi.offsets = 123;
 info.uprobe_multi.count = 3;
 err = bpf_link_get_info_by_fd(fd, &info, &len);
 ASSERT_EQ(err, -EFAULT, "failed_wrong_offsets");
}

static void test_uprobe_multi_fill_link_info(struct test_fill_link_info *skel,
          bool retprobe, bool invalid)
{
 LIBBPF_OPTS(bpf_uprobe_multi_opts, opts,
  .retprobe = retprobe,
 );
 const char *syms[3] = {
  "uprobe_link_info_func_1",
  "uprobe_link_info_func_2",
  "uprobe_link_info_func_3",
 };
 __u64 cookies[3] = {
  0xdead,
  0xbeef,
  0xcafe,
 };
 const char *sema[3] = {
  "uprobe_link_info_sema_1",
  "uprobe_link_info_sema_2",
  "uprobe_link_info_sema_3",
 };
 __u64 *offsets = NULL, *ref_ctr_offsets;
 struct bpf_link *link;
 int link_fd, err;

 err = elf_resolve_syms_offsets("/proc/self/exe", 3, sema,
           (unsigned long **) &ref_ctr_offsets, STT_OBJECT);
 if (!ASSERT_OK(err, "elf_resolve_syms_offsets_object"))
  return;

 err = elf_resolve_syms_offsets("/proc/self/exe", 3, syms,
           (unsigned long **) &offsets, STT_FUNC);
 if (!ASSERT_OK(err, "elf_resolve_syms_offsets_func"))
  goto out;

 opts.syms = syms;
 opts.cookies = &cookies[0];
 opts.ref_ctr_offsets = (unsigned long *) &ref_ctr_offsets[0];
 opts.cnt = ARRAY_SIZE(syms);

 link = bpf_program__attach_uprobe_multi(skel->progs.umulti_run, 0,
      "/proc/self/exe", NULL, &opts);
 if (!ASSERT_OK_PTR(link, "bpf_program__attach_uprobe_multi"))
  goto out;

 link_fd = bpf_link__fd(link);
 if (invalid)
  verify_umulti_invalid_user_buffer(link_fd);
 else
  verify_umulti_link_info(link_fd, retprobe, offsets, cookies, ref_ctr_offsets);

 bpf_link__destroy(link);
out:
 free(ref_ctr_offsets);
 free(offsets);
}

void test_fill_link_info(void)
{
 struct test_fill_link_info *skel;
 int i;

 skel = test_fill_link_info__open_and_load();
 if (!ASSERT_OK_PTR(skel, "skel_open"))
  return;

 /* load kallsyms to compare the addr */
 if (!ASSERT_OK(load_kallsyms(), "load_kallsyms"))
  goto cleanup;

 kprobe_addr = ksym_get_addr(KPROBE_FUNC);
 if (test__start_subtest("kprobe_link_info"))
  test_kprobe_fill_link_info(skel, BPF_PERF_EVENT_KPROBE, false);
 if (test__start_subtest("kretprobe_link_info"))
  test_kprobe_fill_link_info(skel, BPF_PERF_EVENT_KRETPROBE, false);
 if (test__start_subtest("kprobe_invalid_ubuff"))
  test_kprobe_fill_link_info(skel, BPF_PERF_EVENT_KPROBE, true);
 if (test__start_subtest("tracepoint_link_info"))
  test_tp_fill_link_info(skel);
 if (test__start_subtest("event_link_info"))
  test_event_fill_link_info(skel);

 uprobe_offset = get_uprobe_offset(&uprobe_func);
 if (test__start_subtest("uprobe_link_info"))
  test_uprobe_fill_link_info(skel, BPF_PERF_EVENT_UPROBE);
 if (test__start_subtest("uretprobe_link_info"))
  test_uprobe_fill_link_info(skel, BPF_PERF_EVENT_URETPROBE);

 qsort(kmulti_syms, KMULTI_CNT, sizeof(kmulti_syms[0]), symbols_cmp_r);
 for (i = 0; i < KMULTI_CNT; i++)
  kmulti_addrs[i] = ksym_get_addr(kmulti_syms[i]);
 if (test__start_subtest("kprobe_multi_link_info")) {
  test_kprobe_multi_fill_link_info(skel, false, false, false);
  test_kprobe_multi_fill_link_info(skel, false, true, false);
 }
 if (test__start_subtest("kretprobe_multi_link_info")) {
  test_kprobe_multi_fill_link_info(skel, true, false, false);
  test_kprobe_multi_fill_link_info(skel, true, true, false);
 }
 if (test__start_subtest("kprobe_multi_invalid_ubuff"))
  test_kprobe_multi_fill_link_info(skel, true, true, true);

 if (test__start_subtest("uprobe_multi_link_info"))
  test_uprobe_multi_fill_link_info(skel, false, false);
 if (test__start_subtest("uretprobe_multi_link_info"))
  test_uprobe_multi_fill_link_info(skel, true, false);
 if (test__start_subtest("uprobe_multi_invalid"))
  test_uprobe_multi_fill_link_info(skel, false, true);

cleanup:
 test_fill_link_info__destroy(skel);
}