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 
test_and_reset_skel(struct find_vma * skel,int expected_find_zero_ret,bool need_test)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 
open_pe(void)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_HARDWARE;
33 	attr.config = PERF_COUNT_HW_CPU_CYCLES;
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 
find_vma_pe_condition(struct find_vma * skel)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 
test_find_vma_pe(struct find_vma * skel)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 
test_find_vma_kprobe(struct find_vma * skel)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 
test_illegal_write_vma(void)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 
test_illegal_write_task(void)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 
serial_test_find_vma(void)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