1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (c) 2018 Facebook
11 #include <linux/perf_event.h>
12 #include <sys/ioctl.h>
14 #include <sys/types.h>
17 #include <linux/bpf.h>
19 #include <bpf/libbpf.h>
21 #include "cgroup_helpers.h"
22 #include "bpf_rlimit.h"
24 #define CHECK(condition, tag, format...) ({ \
25 int __ret = !!(condition); \
27 printf("%s:FAIL:%s ", __func__, tag); \
30 printf("%s:PASS:%s\n", __func__, tag); \
35 static int bpf_find_map(const char *test, struct bpf_object *obj,
40 map = bpf_object__find_map_by_name(obj, name);
43 return bpf_map__fd(map);
46 #define TEST_CGROUP "/test-bpf-get-cgroup-id/"
48 int main(int argc, char **argv)
50 const char *probe_name = "syscalls/sys_enter_nanosleep";
51 const char *file = "get_cgroup_id_kern.o";
52 int err, bytes, efd, prog_fd, pmu_fd;
53 int cgroup_fd, cgidmap_fd, pidmap_fd;
54 struct perf_event_attr attr = {};
55 struct bpf_object *obj;
56 __u64 kcgid = 0, ucgid;
61 err = setup_cgroup_environment();
62 if (CHECK(err, "setup_cgroup_environment", "err %d errno %d\n", err,
66 cgroup_fd = create_and_get_cgroup(TEST_CGROUP);
67 if (CHECK(cgroup_fd < 0, "create_and_get_cgroup", "err %d errno %d\n",
69 goto cleanup_cgroup_env;
71 err = join_cgroup(TEST_CGROUP);
72 if (CHECK(err, "join_cgroup", "err %d errno %d\n", err, errno))
73 goto cleanup_cgroup_env;
75 err = bpf_prog_load(file, BPF_PROG_TYPE_TRACEPOINT, &obj, &prog_fd);
76 if (CHECK(err, "bpf_prog_load", "err %d errno %d\n", err, errno))
77 goto cleanup_cgroup_env;
79 cgidmap_fd = bpf_find_map(__func__, obj, "cg_ids");
80 if (CHECK(cgidmap_fd < 0, "bpf_find_map", "err %d errno %d\n",
84 pidmap_fd = bpf_find_map(__func__, obj, "pidmap");
85 if (CHECK(pidmap_fd < 0, "bpf_find_map", "err %d errno %d\n",
90 bpf_map_update_elem(pidmap_fd, &key, &pid, 0);
92 snprintf(buf, sizeof(buf),
93 "/sys/kernel/debug/tracing/events/%s/id", probe_name);
94 efd = open(buf, O_RDONLY, 0);
95 if (CHECK(efd < 0, "open", "err %d errno %d\n", efd, errno))
97 bytes = read(efd, buf, sizeof(buf));
99 if (CHECK(bytes <= 0 || bytes >= sizeof(buf), "read",
100 "bytes %d errno %d\n", bytes, errno))
103 attr.config = strtol(buf, NULL, 0);
104 attr.type = PERF_TYPE_TRACEPOINT;
105 attr.sample_type = PERF_SAMPLE_RAW;
106 attr.sample_period = 1;
107 attr.wakeup_events = 1;
109 /* attach to this pid so the all bpf invocations will be in the
110 * cgroup associated with this pid.
112 pmu_fd = syscall(__NR_perf_event_open, &attr, getpid(), -1, -1, 0);
113 if (CHECK(pmu_fd < 0, "perf_event_open", "err %d errno %d\n", pmu_fd,
117 err = ioctl(pmu_fd, PERF_EVENT_IOC_ENABLE, 0);
118 if (CHECK(err, "perf_event_ioc_enable", "err %d errno %d\n", err,
122 err = ioctl(pmu_fd, PERF_EVENT_IOC_SET_BPF, prog_fd);
123 if (CHECK(err, "perf_event_ioc_set_bpf", "err %d errno %d\n", err,
127 /* trigger some syscalls */
130 err = bpf_map_lookup_elem(cgidmap_fd, &key, &kcgid);
131 if (CHECK(err, "bpf_map_lookup_elem", "err %d errno %d\n", err, errno))
134 ucgid = get_cgroup_id(TEST_CGROUP);
135 if (CHECK(kcgid != ucgid, "compare_cgroup_id",
136 "kern cgid %llx user cgid %llx", kcgid, ucgid))
140 printf("%s:PASS\n", argv[0]);
145 bpf_object__close(obj);
147 cleanup_cgroup_environment();