tools/testing/selftests/bpf/prog_tests/module_attach.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright (c) 2020 Facebook */
   3
   4 #include <test_progs.h>
   5 #include <stdbool.h>
   6 #include "test_module_attach.skel.h"
   7 #include "testing_helpers.h"
   8
   9 static int duration;
  10
  11 static int trigger_module_test_writable(int *val)
  12 {
  13         int fd, err;
  14         char buf[65];
  15         ssize_t rd;
  16
  17         fd = open(BPF_TESTMOD_TEST_FILE, O_RDONLY);
  18         err = -errno;
  19         if (!ASSERT_GE(fd, 0, "testmode_file_open"))
  20                 return err;
  21
  22         rd = read(fd, buf, sizeof(buf) - 1);
  23         err = -errno;
  24         if (!ASSERT_GT(rd, 0, "testmod_file_rd_val")) {
  25                 close(fd);
  26                 return err;
  27         }
  28
  29         buf[rd] = '\0';
  30         *val = strtol(buf, NULL, 0);
  31         close(fd);
  32
  33         return 0;
  34 }
  35
  36 void test_module_attach(void)
  37 {
  38         const int READ_SZ = 456;
  39         const int WRITE_SZ = 457;
  40         struct test_module_attach* skel;
  41         struct test_module_attach__bss *bss;
  42         struct bpf_link *link;
  43         int err;
  44         int writable_val = 0;
  45
  46         skel = test_module_attach__open();
  47         if (CHECK(!skel, "skel_open", "failed to open skeleton\n"))
  48                 return;
  49
  50         err = bpf_program__set_attach_target(skel->progs.handle_fentry_manual,
  51                                              0, "bpf_testmod_test_read");
  52         ASSERT_OK(err, "set_attach_target");
  53
  54         err = bpf_program__set_attach_target(skel->progs.handle_fentry_explicit_manual,
  55                                              0, "bpf_testmod:bpf_testmod_test_read");
  56         ASSERT_OK(err, "set_attach_target_explicit");
  57
  58         err = test_module_attach__load(skel);
  59         if (CHECK(err, "skel_load", "failed to load skeleton\n"))
  60                 return;
  61
  62         bss = skel->bss;
  63
  64         err = test_module_attach__attach(skel);
  65         if (CHECK(err, "skel_attach", "skeleton attach failed: %d\n", err))
  66                 goto cleanup;
  67
  68         /* trigger tracepoint */
  69         ASSERT_OK(trigger_module_test_read(READ_SZ), "trigger_read");
  70         ASSERT_OK(trigger_module_test_write(WRITE_SZ), "trigger_write");
  71
  72         ASSERT_EQ(bss->raw_tp_read_sz, READ_SZ, "raw_tp");
  73         ASSERT_EQ(bss->raw_tp_bare_write_sz, WRITE_SZ, "raw_tp_bare");
  74         ASSERT_EQ(bss->tp_btf_read_sz, READ_SZ, "tp_btf");
  75         ASSERT_EQ(bss->fentry_read_sz, READ_SZ, "fentry");
  76         ASSERT_EQ(bss->fentry_manual_read_sz, READ_SZ, "fentry_manual");
  77         ASSERT_EQ(bss->fentry_explicit_read_sz, READ_SZ, "fentry_explicit");
  78         ASSERT_EQ(bss->fentry_explicit_manual_read_sz, READ_SZ, "fentry_explicit_manual");
  79         ASSERT_EQ(bss->fexit_read_sz, READ_SZ, "fexit");
  80         ASSERT_EQ(bss->fexit_ret, -EIO, "fexit_tet");
  81         ASSERT_EQ(bss->fmod_ret_read_sz, READ_SZ, "fmod_ret");
  82
  83         bss->raw_tp_writable_bare_early_ret = true;
  84         bss->raw_tp_writable_bare_out_val = 0xf1f2f3f4;
  85         ASSERT_OK(trigger_module_test_writable(&writable_val),
  86                   "trigger_writable");
  87         ASSERT_EQ(bss->raw_tp_writable_bare_in_val, 1024, "writable_test_in");
  88         ASSERT_EQ(bss->raw_tp_writable_bare_out_val, writable_val,
  89                   "writable_test_out");
  90
  91         test_module_attach__detach(skel);
  92
  93         /* attach fentry/fexit and make sure it get's module reference */
  94         link = bpf_program__attach(skel->progs.handle_fentry);
  95         if (!ASSERT_OK_PTR(link, "attach_fentry"))
  96                 goto cleanup;
  97
  98         ASSERT_ERR(unload_bpf_testmod(false), "unload_bpf_testmod");
  99         bpf_link__destroy(link);
 100
 101         link = bpf_program__attach(skel->progs.handle_fexit);
 102         if (!ASSERT_OK_PTR(link, "attach_fexit"))
 103                 goto cleanup;
 104
 105         ASSERT_ERR(unload_bpf_testmod(false), "unload_bpf_testmod");
 106         bpf_link__destroy(link);
 107
 108         link = bpf_program__attach(skel->progs.kprobe_multi);
 109         if (!ASSERT_OK_PTR(link, "attach_kprobe_multi"))
 110                 goto cleanup;
 111
 112         ASSERT_ERR(unload_bpf_testmod(false), "unload_bpf_testmod");
 113         bpf_link__destroy(link);
 114
 115 cleanup:
 116         test_module_attach__destroy(skel);
 117 }