tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2/* Copyright (c) 2023 Meta Platforms, Inc. and affiliates. */
3
4#include <sys/syscall.h>
5#include <sys/mman.h>
6#include <sys/wait.h>
7#include <unistd.h>
8#include <malloc.h>
9#include <stdlib.h>
10#include <test_progs.h>
11#include "cgroup_helpers.h"
12
13#include "iters.skel.h"
14#include "iters_state_safety.skel.h"
15#include "iters_looping.skel.h"
16#include "iters_num.skel.h"
17#include "iters_testmod_seq.skel.h"
18#include "iters_task_vma.skel.h"
19#include "iters_task.skel.h"
20#include "iters_css_task.skel.h"
21#include "iters_css.skel.h"
22#include "iters_task_failure.skel.h"
23
24static void subtest_num_iters(void)
25{
26 struct iters_num *skel;
27 int err;
28
29 skel = iters_num__open_and_load();
30 if (!ASSERT_OK_PTR(skel, "skel_open_and_load"))
31 return;
32
33 err = iters_num__attach(skel);
34 if (!ASSERT_OK(err, "skel_attach"))
35 goto cleanup;
36
37 usleep(1);
38 iters_num__detach(skel);
39
40#define VALIDATE_CASE(case_name) \
41 ASSERT_EQ(skel->bss->res_##case_name, \
42 skel->rodata->exp_##case_name, \
43 #case_name)
44
45 VALIDATE_CASE(empty_zero);
46 VALIDATE_CASE(empty_int_min);
47 VALIDATE_CASE(empty_int_max);
48 VALIDATE_CASE(empty_minus_one);
49
50 VALIDATE_CASE(simple_sum);
51 VALIDATE_CASE(neg_sum);
52 VALIDATE_CASE(very_neg_sum);
53 VALIDATE_CASE(neg_pos_sum);
54
55 VALIDATE_CASE(invalid_range);
56 VALIDATE_CASE(max_range);
57 VALIDATE_CASE(e2big_range);
58
59 VALIDATE_CASE(succ_elem_cnt);
60 VALIDATE_CASE(overfetched_elem_cnt);
61 VALIDATE_CASE(fail_elem_cnt);
62
63#undef VALIDATE_CASE
64
65cleanup:
66 iters_num__destroy(skel);
67}
68
69static void subtest_testmod_seq_iters(void)
70{
71 struct iters_testmod_seq *skel;
72 int err;
73
74 if (!env.has_testmod) {
75 test__skip();
76 return;
77 }
78
79 skel = iters_testmod_seq__open_and_load();
80 if (!ASSERT_OK_PTR(skel, "skel_open_and_load"))
81 return;
82
83 err = iters_testmod_seq__attach(skel);
84 if (!ASSERT_OK(err, "skel_attach"))
85 goto cleanup;
86
87 usleep(1);
88 iters_testmod_seq__detach(skel);
89
90#define VALIDATE_CASE(case_name) \
91 ASSERT_EQ(skel->bss->res_##case_name, \
92 skel->rodata->exp_##case_name, \
93 #case_name)
94
95 VALIDATE_CASE(empty);
96 VALIDATE_CASE(full);
97 VALIDATE_CASE(truncated);
98
99#undef VALIDATE_CASE
100
101cleanup:
102 iters_testmod_seq__destroy(skel);
103}
104
105static void subtest_task_vma_iters(void)
106{
107 unsigned long start, end, bpf_iter_start, bpf_iter_end;
108 struct iters_task_vma *skel;
109 char rest_of_line[1000];
110 unsigned int seen;
111 FILE *f = NULL;
112 int err;
113
114 skel = iters_task_vma__open_and_load();
115 if (!ASSERT_OK_PTR(skel, "skel_open_and_load"))
116 return;
117
118 skel->bss->target_pid = getpid();
119
120 err = iters_task_vma__attach(skel);
121 if (!ASSERT_OK(err, "skel_attach"))
122 goto cleanup;
123
124 getpgid(skel->bss->target_pid);
125 iters_task_vma__detach(skel);
126
127 if (!ASSERT_GT(skel->bss->vmas_seen, 0, "vmas_seen_gt_zero"))
128 goto cleanup;
129
130 f = fopen("/proc/self/maps", "r");
131 if (!ASSERT_OK_PTR(f, "proc_maps_fopen"))
132 goto cleanup;
133
134 seen = 0;
135 while (fscanf(f, "%lx-%lx %[^\n]\n", &start, &end, rest_of_line) == 3) {
136 /* [vsyscall] vma isn't _really_ part of task->mm vmas.
137 * /proc/PID/maps returns it when out of vmas - see get_gate_vma
138 * calls in fs/proc/task_mmu.c
139 */
140 if (strstr(rest_of_line, "[vsyscall]"))
141 continue;
142
143 bpf_iter_start = skel->bss->vm_ranges[seen].vm_start;
144 bpf_iter_end = skel->bss->vm_ranges[seen].vm_end;
145
146 ASSERT_EQ(bpf_iter_start, start, "vma->vm_start match");
147 ASSERT_EQ(bpf_iter_end, end, "vma->vm_end match");
148 seen++;
149 }
150
151 if (!ASSERT_EQ(skel->bss->vmas_seen, seen, "vmas_seen_eq"))
152 goto cleanup;
153
154cleanup:
155 if (f)
156 fclose(f);
157 iters_task_vma__destroy(skel);
158}
159
160static pthread_mutex_t do_nothing_mutex;
161
162static void *do_nothing_wait(void *arg)
163{
164 pthread_mutex_lock(&do_nothing_mutex);
165 pthread_mutex_unlock(&do_nothing_mutex);
166
167 pthread_exit(arg);
168}
169
170#define thread_num 2
171
172static void subtest_task_iters(void)
173{
174 struct iters_task *skel = NULL;
175 pthread_t thread_ids[thread_num];
176 void *ret;
177 int err;
178
179 skel = iters_task__open_and_load();
180 if (!ASSERT_OK_PTR(skel, "open_and_load"))
181 goto cleanup;
182 skel->bss->target_pid = getpid();
183 err = iters_task__attach(skel);
184 if (!ASSERT_OK(err, "iters_task__attach"))
185 goto cleanup;
186 pthread_mutex_lock(&do_nothing_mutex);
187 for (int i = 0; i < thread_num; i++)
188 ASSERT_OK(pthread_create(&thread_ids[i], NULL, &do_nothing_wait, NULL),
189 "pthread_create");
190
191 syscall(SYS_getpgid);
192 iters_task__detach(skel);
193 ASSERT_EQ(skel->bss->procs_cnt, 1, "procs_cnt");
194 ASSERT_EQ(skel->bss->threads_cnt, thread_num + 1, "threads_cnt");
195 ASSERT_EQ(skel->bss->proc_threads_cnt, thread_num + 1, "proc_threads_cnt");
196 pthread_mutex_unlock(&do_nothing_mutex);
197 for (int i = 0; i < thread_num; i++)
198 ASSERT_OK(pthread_join(thread_ids[i], &ret), "pthread_join");
199cleanup:
200 iters_task__destroy(skel);
201}
202
203extern int stack_mprotect(void);
204
205static void subtest_css_task_iters(void)
206{
207 struct iters_css_task *skel = NULL;
208 int err, cg_fd, cg_id;
209 const char *cgrp_path = "/cg1";
210
211 err = setup_cgroup_environment();
212 if (!ASSERT_OK(err, "setup_cgroup_environment"))
213 goto cleanup;
214 cg_fd = create_and_get_cgroup(cgrp_path);
215 if (!ASSERT_GE(cg_fd, 0, "create_and_get_cgroup"))
216 goto cleanup;
217 cg_id = get_cgroup_id(cgrp_path);
218 err = join_cgroup(cgrp_path);
219 if (!ASSERT_OK(err, "join_cgroup"))
220 goto cleanup;
221
222 skel = iters_css_task__open_and_load();
223 if (!ASSERT_OK_PTR(skel, "open_and_load"))
224 goto cleanup;
225
226 skel->bss->target_pid = getpid();
227 skel->bss->cg_id = cg_id;
228 err = iters_css_task__attach(skel);
229 if (!ASSERT_OK(err, "iters_task__attach"))
230 goto cleanup;
231 err = stack_mprotect();
232 if (!ASSERT_EQ(err, -1, "stack_mprotect") ||
233 !ASSERT_EQ(errno, EPERM, "stack_mprotect"))
234 goto cleanup;
235 iters_css_task__detach(skel);
236 ASSERT_EQ(skel->bss->css_task_cnt, 1, "css_task_cnt");
237
238cleanup:
239 cleanup_cgroup_environment();
240 iters_css_task__destroy(skel);
241}
242
243static void subtest_css_iters(void)
244{
245 struct iters_css *skel = NULL;
246 struct {
247 const char *path;
248 int fd;
249 } cgs[] = {
250 { "/cg1" },
251 { "/cg1/cg2" },
252 { "/cg1/cg2/cg3" },
253 { "/cg1/cg2/cg3/cg4" },
254 };
255 int err, cg_nr = ARRAY_SIZE(cgs);
256 int i;
257
258 err = setup_cgroup_environment();
259 if (!ASSERT_OK(err, "setup_cgroup_environment"))
260 goto cleanup;
261 for (i = 0; i < cg_nr; i++) {
262 cgs[i].fd = create_and_get_cgroup(cgs[i].path);
263 if (!ASSERT_GE(cgs[i].fd, 0, "create_and_get_cgroup"))
264 goto cleanup;
265 }
266
267 skel = iters_css__open_and_load();
268 if (!ASSERT_OK_PTR(skel, "open_and_load"))
269 goto cleanup;
270
271 skel->bss->target_pid = getpid();
272 skel->bss->root_cg_id = get_cgroup_id(cgs[0].path);
273 skel->bss->leaf_cg_id = get_cgroup_id(cgs[cg_nr - 1].path);
274 err = iters_css__attach(skel);
275
276 if (!ASSERT_OK(err, "iters_task__attach"))
277 goto cleanup;
278
279 syscall(SYS_getpgid);
280 ASSERT_EQ(skel->bss->pre_order_cnt, cg_nr, "pre_order_cnt");
281 ASSERT_EQ(skel->bss->first_cg_id, get_cgroup_id(cgs[0].path), "first_cg_id");
282
283 ASSERT_EQ(skel->bss->post_order_cnt, cg_nr, "post_order_cnt");
284 ASSERT_EQ(skel->bss->last_cg_id, get_cgroup_id(cgs[0].path), "last_cg_id");
285 ASSERT_EQ(skel->bss->tree_high, cg_nr - 1, "tree_high");
286 iters_css__detach(skel);
287cleanup:
288 cleanup_cgroup_environment();
289 iters_css__destroy(skel);
290}
291
292void test_iters(void)
293{
294 RUN_TESTS(iters_state_safety);
295 RUN_TESTS(iters_looping);
296 RUN_TESTS(iters);
297 RUN_TESTS(iters_css_task);
298
299 if (env.has_testmod)
300 RUN_TESTS(iters_testmod_seq);
301
302 if (test__start_subtest("num"))
303 subtest_num_iters();
304 if (test__start_subtest("testmod_seq"))
305 subtest_testmod_seq_iters();
306 if (test__start_subtest("task_vma"))
307 subtest_task_vma_iters();
308 if (test__start_subtest("task"))
309 subtest_task_iters();
310 if (test__start_subtest("css_task"))
311 subtest_css_task_iters();
312 if (test__start_subtest("css"))
313 subtest_css_iters();
314 RUN_TESTS(iters_task_failure);
315}