1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2021 Facebook */
3 #include <test_progs.h>
4 #include <sys/types.h>
5 #include <unistd.h>
6 #include "find_vma.skel.h"
7 #include "find_vma_fail1.skel.h"
8 #include "find_vma_fail2.skel.h"
9
10 static void test_and_reset_skel(struct find_vma *skel, int expected_find_zero_ret, bool need_test)
11 {
12 if (need_test) {
13 ASSERT_EQ(skel->bss->found_vm_exec, 1, "found_vm_exec");
14 ASSERT_EQ(skel->data->find_addr_ret, 0, "find_addr_ret");
15 ASSERT_EQ(skel->data->find_zero_ret, expected_find_zero_ret, "find_zero_ret");
16 ASSERT_OK_PTR(strstr(skel->bss->d_iname, "test_progs"), "find_test_progs");
17 }
18
19 skel->bss->found_vm_exec = 0;
20 skel->data->find_addr_ret = -1;
21 skel->data->find_zero_ret = -1;
22 skel->bss->d_iname[0] = 0;
23 }
24
25 static int open_pe(void)
26 {
27 struct perf_event_attr attr = {0};
28 int pfd;
29
30 /* create perf event */
31 attr.size = sizeof(attr);
32 attr.type = PERF_TYPE_SOFTWARE;
33 attr.config = PERF_COUNT_SW_CPU_CLOCK;
34 attr.freq = 1;
35 attr.sample_freq = 1000;
36 pfd = syscall(__NR_perf_event_open, &attr, 0, -1, -1, PERF_FLAG_FD_CLOEXEC);
37
38 return pfd >= 0 ? pfd : -errno;
39 }
40
41 static bool find_vma_pe_condition(struct find_vma *skel)
42 {
43 return skel->bss->found_vm_exec == 0 ||
44 skel->data->find_addr_ret != 0 ||
45 skel->data->find_zero_ret == -1 ||
46 strcmp(skel->bss->d_iname, "test_progs") != 0;
47 }
48
49 static void test_find_vma_pe(struct find_vma *skel)
50 {
51 struct bpf_link *link = NULL;
52 volatile int j = 0;
53 int pfd, i;
54 const int one_bn = 1000000000;
55
56 pfd = open_pe();
57 if (pfd < 0) {
58 if (pfd == -ENOENT || pfd == -EOPNOTSUPP) {
59 printf("%s:SKIP:no PERF_COUNT_HW_CPU_CYCLES\n", __func__);
60 test__skip();
61 goto cleanup;
62 }
63 if (!ASSERT_GE(pfd, 0, "perf_event_open"))
64 goto cleanup;
65 }
66
67 link = bpf_program__attach_perf_event(skel->progs.handle_pe, pfd);
68 if (!ASSERT_OK_PTR(link, "attach_perf_event"))
69 goto cleanup;
70
71 for (i = 0; i < one_bn && find_vma_pe_condition(skel); ++i)
72 ++j;
73
74 test_and_reset_skel(skel, -EBUSY /* in nmi, irq_work is busy */, i == one_bn);
75 cleanup:
76 bpf_link__destroy(link);
77 close(pfd);
78 }
79
80 static void test_find_vma_kprobe(struct find_vma *skel)
81 {
82 int err;
83
84 err = find_vma__attach(skel);
85 if (!ASSERT_OK(err, "get_branch_snapshot__attach"))
86 return;
87
88 getpgid(skel->bss->target_pid);
89 test_and_reset_skel(skel, -ENOENT /* could not find vma for ptr 0 */, true);
90 }
91
92 static void test_illegal_write_vma(void)
93 {
94 struct find_vma_fail1 *skel;
95
96 skel = find_vma_fail1__open_and_load();
97 if (!ASSERT_ERR_PTR(skel, "find_vma_fail1__open_and_load"))
98 find_vma_fail1__destroy(skel);
99 }
100
101 static void test_illegal_write_task(void)
102 {
103 struct find_vma_fail2 *skel;
104
105 skel = find_vma_fail2__open_and_load();
106 if (!ASSERT_ERR_PTR(skel, "find_vma_fail2__open_and_load"))
107 find_vma_fail2__destroy(skel);
108 }
109
110 void serial_test_find_vma(void)
111 {
112 struct find_vma *skel;
113
114 skel = find_vma__open_and_load();
115 if (!ASSERT_OK_PTR(skel, "find_vma__open_and_load"))
116 return;
117
118 skel->bss->target_pid = getpid();
119 skel->bss->addr = (__u64)(uintptr_t)test_find_vma_pe;
120
121 test_find_vma_pe(skel);
122 test_find_vma_kprobe(skel);
123
124 find_vma__destroy(skel);
125 test_illegal_write_vma();
126 test_illegal_write_task();
127 }
128
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