1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2024 Meta Platforms, Inc. and affiliates. */
3 #include <test_progs.h>
4
5 #include "test_build_id.skel.h"
6
7 static char build_id[BPF_BUILD_ID_SIZE];
8 static int build_id_sz;
9
10 static void print_stack(struct bpf_stack_build_id *stack, int frame_cnt)
11 {
12 int i, j;
13
14 for (i = 0; i < frame_cnt; i++) {
15 printf("FRAME #%02d: ", i);
16 switch (stack[i].status) {
17 case BPF_STACK_BUILD_ID_EMPTY:
18 printf("<EMPTY>\n");
19 break;
20 case BPF_STACK_BUILD_ID_VALID:
21 printf("BUILD ID = ");
22 for (j = 0; j < BPF_BUILD_ID_SIZE; j++)
23 printf("%02hhx", (unsigned)stack[i].build_id[j]);
24 printf(" OFFSET = %llx", (unsigned long long)stack[i].offset);
25 break;
26 case BPF_STACK_BUILD_ID_IP:
27 printf("IP = %llx", (unsigned long long)stack[i].ip);
28 break;
29 default:
30 printf("UNEXPECTED STATUS %d ", stack[i].status);
31 break;
32 }
33 printf("\n");
34 }
35 }
36
37 static void subtest_nofault(bool build_id_resident)
38 {
39 struct test_build_id *skel;
40 struct bpf_stack_build_id *stack;
41 int frame_cnt;
42
43 skel = test_build_id__open_and_load();
44 if (!ASSERT_OK_PTR(skel, "skel_open"))
45 return;
46
47 skel->links.uprobe_nofault = bpf_program__attach(skel->progs.uprobe_nofault);
48 if (!ASSERT_OK_PTR(skel->links.uprobe_nofault, "link"))
49 goto cleanup;
50
51 if (build_id_resident)
52 ASSERT_OK(system("./uprobe_multi uprobe-paged-in"), "trigger_uprobe");
53 else
54 ASSERT_OK(system("./uprobe_multi uprobe-paged-out"), "trigger_uprobe");
55
56 if (!ASSERT_GT(skel->bss->res_nofault, 0, "res"))
57 goto cleanup;
58
59 stack = skel->bss->stack_nofault;
60 frame_cnt = skel->bss->res_nofault / sizeof(struct bpf_stack_build_id);
61 if (env.verbosity >= VERBOSE_NORMAL)
62 print_stack(stack, frame_cnt);
63
64 if (build_id_resident) {
65 ASSERT_EQ(stack[0].status, BPF_STACK_BUILD_ID_VALID, "build_id_status");
66 ASSERT_EQ(memcmp(stack[0].build_id, build_id, build_id_sz), 0, "build_id_match");
67 } else {
68 ASSERT_EQ(stack[0].status, BPF_STACK_BUILD_ID_IP, "build_id_status");
69 }
70
71 cleanup:
72 test_build_id__destroy(skel);
73 }
74
75 static void subtest_sleepable(void)
76 {
77 struct test_build_id *skel;
78 struct bpf_stack_build_id *stack;
79 int frame_cnt;
80
81 skel = test_build_id__open_and_load();
82 if (!ASSERT_OK_PTR(skel, "skel_open"))
83 return;
84
85 skel->links.uprobe_sleepable = bpf_program__attach(skel->progs.uprobe_sleepable);
86 if (!ASSERT_OK_PTR(skel->links.uprobe_sleepable, "link"))
87 goto cleanup;
88
89 /* force build ID to not be paged in */
90 ASSERT_OK(system("./uprobe_multi uprobe-paged-out"), "trigger_uprobe");
91
92 if (!ASSERT_GT(skel->bss->res_sleepable, 0, "res"))
93 goto cleanup;
94
95 stack = skel->bss->stack_sleepable;
96 frame_cnt = skel->bss->res_sleepable / sizeof(struct bpf_stack_build_id);
97 if (env.verbosity >= VERBOSE_NORMAL)
98 print_stack(stack, frame_cnt);
99
100 ASSERT_EQ(stack[0].status, BPF_STACK_BUILD_ID_VALID, "build_id_status");
101 ASSERT_EQ(memcmp(stack[0].build_id, build_id, build_id_sz), 0, "build_id_match");
102
103 cleanup:
104 test_build_id__destroy(skel);
105 }
106
107 void serial_test_build_id(void)
108 {
109 build_id_sz = read_build_id("uprobe_multi", build_id, sizeof(build_id));
110 ASSERT_EQ(build_id_sz, BPF_BUILD_ID_SIZE, "parse_build_id");
111
112 if (test__start_subtest("nofault-paged-out"))
113 subtest_nofault(false /* not resident */);
114 if (test__start_subtest("nofault-paged-in"))
115 subtest_nofault(true /* resident */);
116 if (test__start_subtest("sleepable"))
117 subtest_sleepable();
118 }
119
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.