tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
selftests/bpf: Add cgroup kfunc / kptr selftests
This patch adds a selftest suite to validate the cgroup kfuncs that were
added in the prior patch.
Signed-off-by: David Vernet <void@manifault.com>
Link: https://lore.kernel.org/r/20221122055458.173143-3-void@manifault.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
authored by
David Vernet
and committed by
Alexei Starovoitov
f583ddf1
fda01efc
+631
+1
tools/testing/selftests/bpf/DENYLIST.s390x
+1
tools/testing/selftests/bpf/DENYLIST.s390x
···
10
10
bpf_tcp_ca # JIT does not support calling kernel function (kfunc)
11
11
cb_refs # expected error message unexpected error: -524 (trampoline)
12
12
cgroup_hierarchical_stats # JIT does not support calling kernel function (kfunc)
13
+
cgrp_kfunc # JIT does not support calling kernel function
13
14
cgrp_local_storage # prog_attach unexpected error: -524 (trampoline)
14
15
core_read_macros # unknown func bpf_probe_read#4 (overlapping)
15
16
d_path # failed to auto-attach program 'prog_stat': -524 (trampoline)
+174
tools/testing/selftests/bpf/prog_tests/cgrp_kfunc.c
+174
tools/testing/selftests/bpf/prog_tests/cgrp_kfunc.c
···
1
+
// SPDX-License-Identifier: GPL-2.0
2
+
/* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */
3
+
4
+
#define _GNU_SOURCE
5
+
#include <cgroup_helpers.h>
6
+
#include <test_progs.h>
7
+
8
+
#include "cgrp_kfunc_failure.skel.h"
9
+
#include "cgrp_kfunc_success.skel.h"
10
+
11
+
static size_t log_buf_sz = 1 << 20; /* 1 MB */
12
+
static char obj_log_buf[1048576];
13
+
14
+
static struct cgrp_kfunc_success *open_load_cgrp_kfunc_skel(void)
15
+
{
16
+
struct cgrp_kfunc_success *skel;
17
+
int err;
18
+
19
+
skel = cgrp_kfunc_success__open();
20
+
if (!ASSERT_OK_PTR(skel, "skel_open"))
21
+
return NULL;
22
+
23
+
skel->bss->pid = getpid();
24
+
25
+
err = cgrp_kfunc_success__load(skel);
26
+
if (!ASSERT_OK(err, "skel_load"))
27
+
goto cleanup;
28
+
29
+
return skel;
30
+
31
+
cleanup:
32
+
cgrp_kfunc_success__destroy(skel);
33
+
return NULL;
34
+
}
35
+
36
+
static int mkdir_rm_test_dir(void)
37
+
{
38
+
int fd;
39
+
const char *cgrp_path = "cgrp_kfunc";
40
+
41
+
fd = create_and_get_cgroup(cgrp_path);
42
+
if (!ASSERT_GT(fd, 0, "mkdir_cgrp_fd"))
43
+
return -1;
44
+
45
+
close(fd);
46
+
remove_cgroup(cgrp_path);
47
+
48
+
return 0;
49
+
}
50
+
51
+
static void run_success_test(const char *prog_name)
52
+
{
53
+
struct cgrp_kfunc_success *skel;
54
+
struct bpf_program *prog;
55
+
struct bpf_link *link = NULL;
56
+
57
+
skel = open_load_cgrp_kfunc_skel();
58
+
if (!ASSERT_OK_PTR(skel, "open_load_skel"))
59
+
return;
60
+
61
+
if (!ASSERT_OK(skel->bss->err, "pre_mkdir_err"))
62
+
goto cleanup;
63
+
64
+
prog = bpf_object__find_program_by_name(skel->obj, prog_name);
65
+
if (!ASSERT_OK_PTR(prog, "bpf_object__find_program_by_name"))
66
+
goto cleanup;
67
+
68
+
link = bpf_program__attach(prog);
69
+
if (!ASSERT_OK_PTR(link, "attached_link"))
70
+
goto cleanup;
71
+
72
+
ASSERT_EQ(skel->bss->invocations, 0, "pre_rmdir_count");
73
+
if (!ASSERT_OK(mkdir_rm_test_dir(), "cgrp_mkdir"))
74
+
goto cleanup;
75
+
76
+
ASSERT_EQ(skel->bss->invocations, 1, "post_rmdir_count");
77
+
ASSERT_OK(skel->bss->err, "post_rmdir_err");
78
+
79
+
cleanup:
80
+
bpf_link__destroy(link);
81
+
cgrp_kfunc_success__destroy(skel);
82
+
}
83
+
84
+
static const char * const success_tests[] = {
85
+
"test_cgrp_acquire_release_argument",
86
+
"test_cgrp_acquire_leave_in_map",
87
+
"test_cgrp_xchg_release",
88
+
"test_cgrp_get_release",
89
+
};
90
+
91
+
static struct {
92
+
const char *prog_name;
93
+
const char *expected_err_msg;
94
+
} failure_tests[] = {
95
+
{"cgrp_kfunc_acquire_untrusted", "R1 must be referenced or trusted"},
96
+
{"cgrp_kfunc_acquire_fp", "arg#0 pointer type STRUCT cgroup must point"},
97
+
{"cgrp_kfunc_acquire_unsafe_kretprobe", "reg type unsupported for arg#0 function"},
98
+
{"cgrp_kfunc_acquire_trusted_walked", "R1 must be referenced or trusted"},
99
+
{"cgrp_kfunc_acquire_null", "arg#0 pointer type STRUCT cgroup must point"},
100
+
{"cgrp_kfunc_acquire_unreleased", "Unreleased reference"},
101
+
{"cgrp_kfunc_get_non_kptr_param", "arg#0 expected pointer to map value"},
102
+
{"cgrp_kfunc_get_non_kptr_acquired", "arg#0 expected pointer to map value"},
103
+
{"cgrp_kfunc_get_null", "arg#0 expected pointer to map value"},
104
+
{"cgrp_kfunc_xchg_unreleased", "Unreleased reference"},
105
+
{"cgrp_kfunc_get_unreleased", "Unreleased reference"},
106
+
{"cgrp_kfunc_release_untrusted", "arg#0 is untrusted_ptr_or_null_ expected ptr_ or socket"},
107
+
{"cgrp_kfunc_release_fp", "arg#0 pointer type STRUCT cgroup must point"},
108
+
{"cgrp_kfunc_release_null", "arg#0 is ptr_or_null_ expected ptr_ or socket"},
109
+
{"cgrp_kfunc_release_unacquired", "release kernel function bpf_cgroup_release expects"},
110
+
};
111
+
112
+
static void verify_fail(const char *prog_name, const char *expected_err_msg)
113
+
{
114
+
LIBBPF_OPTS(bpf_object_open_opts, opts);
115
+
struct cgrp_kfunc_failure *skel;
116
+
int err, i;
117
+
118
+
opts.kernel_log_buf = obj_log_buf;
119
+
opts.kernel_log_size = log_buf_sz;
120
+
opts.kernel_log_level = 1;
121
+
122
+
skel = cgrp_kfunc_failure__open_opts(&opts);
123
+
if (!ASSERT_OK_PTR(skel, "cgrp_kfunc_failure__open_opts"))
124
+
goto cleanup;
125
+
126
+
for (i = 0; i < ARRAY_SIZE(failure_tests); i++) {
127
+
struct bpf_program *prog;
128
+
const char *curr_name = failure_tests[i].prog_name;
129
+
130
+
prog = bpf_object__find_program_by_name(skel->obj, curr_name);
131
+
if (!ASSERT_OK_PTR(prog, "bpf_object__find_program_by_name"))
132
+
goto cleanup;
133
+
134
+
bpf_program__set_autoload(prog, !strcmp(curr_name, prog_name));
135
+
}
136
+
137
+
err = cgrp_kfunc_failure__load(skel);
138
+
if (!ASSERT_ERR(err, "unexpected load success"))
139
+
goto cleanup;
140
+
141
+
if (!ASSERT_OK_PTR(strstr(obj_log_buf, expected_err_msg), "expected_err_msg")) {
142
+
fprintf(stderr, "Expected err_msg: %s\n", expected_err_msg);
143
+
fprintf(stderr, "Verifier output: %s\n", obj_log_buf);
144
+
}
145
+
146
+
cleanup:
147
+
cgrp_kfunc_failure__destroy(skel);
148
+
}
149
+
150
+
void test_cgrp_kfunc(void)
151
+
{
152
+
int i, err;
153
+
154
+
err = setup_cgroup_environment();
155
+
if (!ASSERT_OK(err, "cgrp_env_setup"))
156
+
goto cleanup;
157
+
158
+
for (i = 0; i < ARRAY_SIZE(success_tests); i++) {
159
+
if (!test__start_subtest(success_tests[i]))
160
+
continue;
161
+
162
+
run_success_test(success_tests[i]);
163
+
}
164
+
165
+
for (i = 0; i < ARRAY_SIZE(failure_tests); i++) {
166
+
if (!test__start_subtest(failure_tests[i].prog_name))
167
+
continue;
168
+
169
+
verify_fail(failure_tests[i].prog_name, failure_tests[i].expected_err_msg);
170
+
}
171
+
172
+
cleanup:
173
+
cleanup_cgroup_environment();
174
+
}
+71
tools/testing/selftests/bpf/progs/cgrp_kfunc_common.h
+71
tools/testing/selftests/bpf/progs/cgrp_kfunc_common.h
···
1
+
/* SPDX-License-Identifier: GPL-2.0 */
2
+
/* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */
3
+
4
+
#ifndef _CGRP_KFUNC_COMMON_H
5
+
#define _CGRP_KFUNC_COMMON_H
6
+
7
+
#include <errno.h>
8
+
#include <vmlinux.h>
9
+
#include <bpf/bpf_helpers.h>
10
+
#include <bpf/bpf_tracing.h>
11
+
12
+
struct __cgrps_kfunc_map_value {
13
+
struct cgroup __kptr_ref * cgrp;
14
+
};
15
+
16
+
struct hash_map {
17
+
__uint(type, BPF_MAP_TYPE_HASH);
18
+
__type(key, int);
19
+
__type(value, struct __cgrps_kfunc_map_value);
20
+
__uint(max_entries, 1);
21
+
} __cgrps_kfunc_map SEC(".maps");
22
+
23
+
struct cgroup *bpf_cgroup_acquire(struct cgroup *p) __ksym;
24
+
struct cgroup *bpf_cgroup_kptr_get(struct cgroup **pp) __ksym;
25
+
void bpf_cgroup_release(struct cgroup *p) __ksym;
26
+
27
+
static inline struct __cgrps_kfunc_map_value *cgrps_kfunc_map_value_lookup(struct cgroup *cgrp)
28
+
{
29
+
s32 id;
30
+
long status;
31
+
32
+
status = bpf_probe_read_kernel(&id, sizeof(id), &cgrp->self.id);
33
+
if (status)
34
+
return NULL;
35
+
36
+
return bpf_map_lookup_elem(&__cgrps_kfunc_map, &id);
37
+
}
38
+
39
+
static inline int cgrps_kfunc_map_insert(struct cgroup *cgrp)
40
+
{
41
+
struct __cgrps_kfunc_map_value local, *v;
42
+
long status;
43
+
struct cgroup *acquired, *old;
44
+
s32 id;
45
+
46
+
status = bpf_probe_read_kernel(&id, sizeof(id), &cgrp->self.id);
47
+
if (status)
48
+
return status;
49
+
50
+
local.cgrp = NULL;
51
+
status = bpf_map_update_elem(&__cgrps_kfunc_map, &id, &local, BPF_NOEXIST);
52
+
if (status)
53
+
return status;
54
+
55
+
v = bpf_map_lookup_elem(&__cgrps_kfunc_map, &id);
56
+
if (!v) {
57
+
bpf_map_delete_elem(&__cgrps_kfunc_map, &id);
58
+
return -ENOENT;
59
+
}
60
+
61
+
acquired = bpf_cgroup_acquire(cgrp);
62
+
old = bpf_kptr_xchg(&v->cgrp, acquired);
63
+
if (old) {
64
+
bpf_cgroup_release(old);
65
+
return -EEXIST;
66
+
}
67
+
68
+
return 0;
69
+
}
70
+
71
+
#endif /* _CGRP_KFUNC_COMMON_H */
+260
tools/testing/selftests/bpf/progs/cgrp_kfunc_failure.c
+260
tools/testing/selftests/bpf/progs/cgrp_kfunc_failure.c
···
1
+
// SPDX-License-Identifier: GPL-2.0
2
+
/* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */
3
+
4
+
#include <vmlinux.h>
5
+
#include <bpf/bpf_tracing.h>
6
+
#include <bpf/bpf_helpers.h>
7
+
8
+
#include "cgrp_kfunc_common.h"
9
+
10
+
char _license[] SEC("license") = "GPL";
11
+
12
+
/* Prototype for all of the program trace events below:
13
+
*
14
+
* TRACE_EVENT(cgroup_mkdir,
15
+
* TP_PROTO(struct cgroup *cgrp, const char *path),
16
+
* TP_ARGS(cgrp, path)
17
+
*/
18
+
19
+
static struct __cgrps_kfunc_map_value *insert_lookup_cgrp(struct cgroup *cgrp)
20
+
{
21
+
int status;
22
+
23
+
status = cgrps_kfunc_map_insert(cgrp);
24
+
if (status)
25
+
return NULL;
26
+
27
+
return cgrps_kfunc_map_value_lookup(cgrp);
28
+
}
29
+
30
+
SEC("tp_btf/cgroup_mkdir")
31
+
int BPF_PROG(cgrp_kfunc_acquire_untrusted, struct cgroup *cgrp, const char *path)
32
+
{
33
+
struct cgroup *acquired;
34
+
struct __cgrps_kfunc_map_value *v;
35
+
36
+
v = insert_lookup_cgrp(cgrp);
37
+
if (!v)
38
+
return 0;
39
+
40
+
/* Can't invoke bpf_cgroup_acquire() on an untrusted pointer. */
41
+
acquired = bpf_cgroup_acquire(v->cgrp);
42
+
bpf_cgroup_release(acquired);
43
+
44
+
return 0;
45
+
}
46
+
47
+
SEC("tp_btf/cgroup_mkdir")
48
+
int BPF_PROG(cgrp_kfunc_acquire_fp, struct cgroup *cgrp, const char *path)
49
+
{
50
+
struct cgroup *acquired, *stack_cgrp = (struct cgroup *)&path;
51
+
52
+
/* Can't invoke bpf_cgroup_acquire() on a random frame pointer. */
53
+
acquired = bpf_cgroup_acquire((struct cgroup *)&stack_cgrp);
54
+
bpf_cgroup_release(acquired);
55
+
56
+
return 0;
57
+
}
58
+
59
+
SEC("kretprobe/cgroup_destroy_locked")
60
+
int BPF_PROG(cgrp_kfunc_acquire_unsafe_kretprobe, struct cgroup *cgrp)
61
+
{
62
+
struct cgroup *acquired;
63
+
64
+
/* Can't acquire an untrusted struct cgroup * pointer. */
65
+
acquired = bpf_cgroup_acquire(cgrp);
66
+
bpf_cgroup_release(acquired);
67
+
68
+
return 0;
69
+
}
70
+
71
+
SEC("tp_btf/cgroup_mkdir")
72
+
int BPF_PROG(cgrp_kfunc_acquire_trusted_walked, struct cgroup *cgrp, const char *path)
73
+
{
74
+
struct cgroup *acquired;
75
+
76
+
/* Can't invoke bpf_cgroup_acquire() on a pointer obtained from walking a trusted cgroup. */
77
+
acquired = bpf_cgroup_acquire(cgrp->old_dom_cgrp);
78
+
bpf_cgroup_release(acquired);
79
+
80
+
return 0;
81
+
}
82
+
83
+
84
+
SEC("tp_btf/cgroup_mkdir")
85
+
int BPF_PROG(cgrp_kfunc_acquire_null, struct cgroup *cgrp, const char *path)
86
+
{
87
+
struct cgroup *acquired;
88
+
89
+
/* Can't invoke bpf_cgroup_acquire() on a NULL pointer. */
90
+
acquired = bpf_cgroup_acquire(NULL);
91
+
if (!acquired)
92
+
return 0;
93
+
bpf_cgroup_release(acquired);
94
+
95
+
return 0;
96
+
}
97
+
98
+
SEC("tp_btf/cgroup_mkdir")
99
+
int BPF_PROG(cgrp_kfunc_acquire_unreleased, struct cgroup *cgrp, const char *path)
100
+
{
101
+
struct cgroup *acquired;
102
+
103
+
acquired = bpf_cgroup_acquire(cgrp);
104
+
105
+
/* Acquired cgroup is never released. */
106
+
107
+
return 0;
108
+
}
109
+
110
+
SEC("tp_btf/cgroup_mkdir")
111
+
int BPF_PROG(cgrp_kfunc_get_non_kptr_param, struct cgroup *cgrp, const char *path)
112
+
{
113
+
struct cgroup *kptr;
114
+
115
+
/* Cannot use bpf_cgroup_kptr_get() on a non-kptr, even on a valid cgroup. */
116
+
kptr = bpf_cgroup_kptr_get(&cgrp);
117
+
if (!kptr)
118
+
return 0;
119
+
120
+
bpf_cgroup_release(kptr);
121
+
122
+
return 0;
123
+
}
124
+
125
+
SEC("tp_btf/cgroup_mkdir")
126
+
int BPF_PROG(cgrp_kfunc_get_non_kptr_acquired, struct cgroup *cgrp, const char *path)
127
+
{
128
+
struct cgroup *kptr, *acquired;
129
+
130
+
acquired = bpf_cgroup_acquire(cgrp);
131
+
132
+
/* Cannot use bpf_cgroup_kptr_get() on a non-map-value, even if the kptr was acquired. */
133
+
kptr = bpf_cgroup_kptr_get(&acquired);
134
+
bpf_cgroup_release(acquired);
135
+
if (!kptr)
136
+
return 0;
137
+
138
+
bpf_cgroup_release(kptr);
139
+
140
+
return 0;
141
+
}
142
+
143
+
SEC("tp_btf/cgroup_mkdir")
144
+
int BPF_PROG(cgrp_kfunc_get_null, struct cgroup *cgrp, const char *path)
145
+
{
146
+
struct cgroup *kptr;
147
+
148
+
/* Cannot use bpf_cgroup_kptr_get() on a NULL pointer. */
149
+
kptr = bpf_cgroup_kptr_get(NULL);
150
+
if (!kptr)
151
+
return 0;
152
+
153
+
bpf_cgroup_release(kptr);
154
+
155
+
return 0;
156
+
}
157
+
158
+
SEC("tp_btf/cgroup_mkdir")
159
+
int BPF_PROG(cgrp_kfunc_xchg_unreleased, struct cgroup *cgrp, const char *path)
160
+
{
161
+
struct cgroup *kptr;
162
+
struct __cgrps_kfunc_map_value *v;
163
+
164
+
v = insert_lookup_cgrp(cgrp);
165
+
if (!v)
166
+
return 0;
167
+
168
+
kptr = bpf_kptr_xchg(&v->cgrp, NULL);
169
+
if (!kptr)
170
+
return 0;
171
+
172
+
/* Kptr retrieved from map is never released. */
173
+
174
+
return 0;
175
+
}
176
+
177
+
SEC("tp_btf/cgroup_mkdir")
178
+
int BPF_PROG(cgrp_kfunc_get_unreleased, struct cgroup *cgrp, const char *path)
179
+
{
180
+
struct cgroup *kptr;
181
+
struct __cgrps_kfunc_map_value *v;
182
+
183
+
v = insert_lookup_cgrp(cgrp);
184
+
if (!v)
185
+
return 0;
186
+
187
+
kptr = bpf_cgroup_kptr_get(&v->cgrp);
188
+
if (!kptr)
189
+
return 0;
190
+
191
+
/* Kptr acquired above is never released. */
192
+
193
+
return 0;
194
+
}
195
+
196
+
SEC("tp_btf/cgroup_mkdir")
197
+
int BPF_PROG(cgrp_kfunc_release_untrusted, struct cgroup *cgrp, const char *path)
198
+
{
199
+
struct __cgrps_kfunc_map_value *v;
200
+
201
+
v = insert_lookup_cgrp(cgrp);
202
+
if (!v)
203
+
return 0;
204
+
205
+
/* Can't invoke bpf_cgroup_release() on an untrusted pointer. */
206
+
bpf_cgroup_release(v->cgrp);
207
+
208
+
return 0;
209
+
}
210
+
211
+
SEC("tp_btf/cgroup_mkdir")
212
+
int BPF_PROG(cgrp_kfunc_release_fp, struct cgroup *cgrp, const char *path)
213
+
{
214
+
struct cgroup *acquired = (struct cgroup *)&path;
215
+
216
+
/* Cannot release random frame pointer. */
217
+
bpf_cgroup_release(acquired);
218
+
219
+
return 0;
220
+
}
221
+
222
+
SEC("tp_btf/cgroup_mkdir")
223
+
int BPF_PROG(cgrp_kfunc_release_null, struct cgroup *cgrp, const char *path)
224
+
{
225
+
struct __cgrps_kfunc_map_value local, *v;
226
+
long status;
227
+
struct cgroup *acquired, *old;
228
+
s32 id;
229
+
230
+
status = bpf_probe_read_kernel(&id, sizeof(id), &cgrp->self.id);
231
+
if (status)
232
+
return 0;
233
+
234
+
local.cgrp = NULL;
235
+
status = bpf_map_update_elem(&__cgrps_kfunc_map, &id, &local, BPF_NOEXIST);
236
+
if (status)
237
+
return status;
238
+
239
+
v = bpf_map_lookup_elem(&__cgrps_kfunc_map, &id);
240
+
if (!v)
241
+
return -ENOENT;
242
+
243
+
acquired = bpf_cgroup_acquire(cgrp);
244
+
245
+
old = bpf_kptr_xchg(&v->cgrp, acquired);
246
+
247
+
/* old cannot be passed to bpf_cgroup_release() without a NULL check. */
248
+
bpf_cgroup_release(old);
249
+
250
+
return 0;
251
+
}
252
+
253
+
SEC("tp_btf/cgroup_mkdir")
254
+
int BPF_PROG(cgrp_kfunc_release_unacquired, struct cgroup *cgrp, const char *path)
255
+
{
256
+
/* Cannot release trusted cgroup pointer which was not acquired. */
257
+
bpf_cgroup_release(cgrp);
258
+
259
+
return 0;
260
+
}
+125
tools/testing/selftests/bpf/progs/cgrp_kfunc_success.c
+125
tools/testing/selftests/bpf/progs/cgrp_kfunc_success.c
···
1
+
// SPDX-License-Identifier: GPL-2.0
2
+
/* Copyright (c) 2022 Meta Platforms, Inc. and affiliates. */
3
+
4
+
#include <vmlinux.h>
5
+
#include <bpf/bpf_tracing.h>
6
+
#include <bpf/bpf_helpers.h>
7
+
8
+
#include "cgrp_kfunc_common.h"
9
+
10
+
char _license[] SEC("license") = "GPL";
11
+
12
+
int err, pid, invocations;
13
+
14
+
/* Prototype for all of the program trace events below:
15
+
*
16
+
* TRACE_EVENT(cgroup_mkdir,
17
+
* TP_PROTO(struct cgroup *cgrp, const char *path),
18
+
* TP_ARGS(cgrp, path)
19
+
*/
20
+
21
+
static bool is_test_kfunc_task(void)
22
+
{
23
+
int cur_pid = bpf_get_current_pid_tgid() >> 32;
24
+
bool same = pid == cur_pid;
25
+
26
+
if (same)
27
+
__sync_fetch_and_add(&invocations, 1);
28
+
29
+
return same;
30
+
}
31
+
32
+
SEC("tp_btf/cgroup_mkdir")
33
+
int BPF_PROG(test_cgrp_acquire_release_argument, struct cgroup *cgrp, const char *path)
34
+
{
35
+
struct cgroup *acquired;
36
+
37
+
if (!is_test_kfunc_task())
38
+
return 0;
39
+
40
+
acquired = bpf_cgroup_acquire(cgrp);
41
+
bpf_cgroup_release(acquired);
42
+
43
+
return 0;
44
+
}
45
+
46
+
SEC("tp_btf/cgroup_mkdir")
47
+
int BPF_PROG(test_cgrp_acquire_leave_in_map, struct cgroup *cgrp, const char *path)
48
+
{
49
+
long status;
50
+
51
+
if (!is_test_kfunc_task())
52
+
return 0;
53
+
54
+
status = cgrps_kfunc_map_insert(cgrp);
55
+
if (status)
56
+
err = 1;
57
+
58
+
return 0;
59
+
}
60
+
61
+
SEC("tp_btf/cgroup_mkdir")
62
+
int BPF_PROG(test_cgrp_xchg_release, struct cgroup *cgrp, const char *path)
63
+
{
64
+
struct cgroup *kptr;
65
+
struct __cgrps_kfunc_map_value *v;
66
+
long status;
67
+
68
+
if (!is_test_kfunc_task())
69
+
return 0;
70
+
71
+
status = cgrps_kfunc_map_insert(cgrp);
72
+
if (status) {
73
+
err = 1;
74
+
return 0;
75
+
}
76
+
77
+
v = cgrps_kfunc_map_value_lookup(cgrp);
78
+
if (!v) {
79
+
err = 2;
80
+
return 0;
81
+
}
82
+
83
+
kptr = bpf_kptr_xchg(&v->cgrp, NULL);
84
+
if (!kptr) {
85
+
err = 3;
86
+
return 0;
87
+
}
88
+
89
+
bpf_cgroup_release(kptr);
90
+
91
+
return 0;
92
+
}
93
+
94
+
SEC("tp_btf/cgroup_mkdir")
95
+
int BPF_PROG(test_cgrp_get_release, struct cgroup *cgrp, const char *path)
96
+
{
97
+
struct cgroup *kptr;
98
+
struct __cgrps_kfunc_map_value *v;
99
+
long status;
100
+
101
+
if (!is_test_kfunc_task())
102
+
return 0;
103
+
104
+
status = cgrps_kfunc_map_insert(cgrp);
105
+
if (status) {
106
+
err = 1;
107
+
return 0;
108
+
}
109
+
110
+
v = cgrps_kfunc_map_value_lookup(cgrp);
111
+
if (!v) {
112
+
err = 2;
113
+
return 0;
114
+
}
115
+
116
+
kptr = bpf_cgroup_kptr_get(&v->cgrp);
117
+
if (!kptr) {
118
+
err = 3;
119
+
return 0;
120
+
}
121
+
122
+
bpf_cgroup_release(kptr);
123
+
124
+
return 0;
125
+
}