150 lines
3.8 KiB
C
150 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2018 Facebook
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <syscall.h>
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#include <unistd.h>
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#include <linux/perf_event.h>
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#include <sys/ioctl.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <linux/bpf.h>
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#include <bpf/bpf.h>
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#include <bpf/libbpf.h>
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#include "cgroup_helpers.h"
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#include "bpf_rlimit.h"
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#define CHECK(condition, tag, format...) ({ \
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int __ret = !!(condition); \
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if (__ret) { \
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printf("%s:FAIL:%s ", __func__, tag); \
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printf(format); \
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} else { \
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printf("%s:PASS:%s\n", __func__, tag); \
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} \
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__ret; \
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})
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static int bpf_find_map(const char *test, struct bpf_object *obj,
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const char *name)
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{
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struct bpf_map *map;
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map = bpf_object__find_map_by_name(obj, name);
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if (!map)
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return -1;
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return bpf_map__fd(map);
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}
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#define TEST_CGROUP "/test-bpf-get-cgroup-id/"
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int main(int argc, char **argv)
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{
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const char *probe_name = "syscalls/sys_enter_nanosleep";
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const char *file = "get_cgroup_id_kern.o";
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int err, bytes, efd, prog_fd, pmu_fd;
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int cgroup_fd, cgidmap_fd, pidmap_fd;
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struct perf_event_attr attr = {};
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struct bpf_object *obj;
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__u64 kcgid = 0, ucgid;
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__u32 key = 0, pid;
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int exit_code = 1;
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char buf[256];
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err = setup_cgroup_environment();
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if (CHECK(err, "setup_cgroup_environment", "err %d errno %d\n", err,
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errno))
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return 1;
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cgroup_fd = create_and_get_cgroup(TEST_CGROUP);
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if (CHECK(cgroup_fd < 0, "create_and_get_cgroup", "err %d errno %d\n",
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cgroup_fd, errno))
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goto cleanup_cgroup_env;
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err = join_cgroup(TEST_CGROUP);
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if (CHECK(err, "join_cgroup", "err %d errno %d\n", err, errno))
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goto cleanup_cgroup_env;
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err = bpf_prog_load(file, BPF_PROG_TYPE_TRACEPOINT, &obj, &prog_fd);
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if (CHECK(err, "bpf_prog_load", "err %d errno %d\n", err, errno))
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goto cleanup_cgroup_env;
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cgidmap_fd = bpf_find_map(__func__, obj, "cg_ids");
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if (CHECK(cgidmap_fd < 0, "bpf_find_map", "err %d errno %d\n",
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cgidmap_fd, errno))
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goto close_prog;
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pidmap_fd = bpf_find_map(__func__, obj, "pidmap");
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if (CHECK(pidmap_fd < 0, "bpf_find_map", "err %d errno %d\n",
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pidmap_fd, errno))
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goto close_prog;
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pid = getpid();
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bpf_map_update_elem(pidmap_fd, &key, &pid, 0);
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snprintf(buf, sizeof(buf),
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"/sys/kernel/debug/tracing/events/%s/id", probe_name);
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efd = open(buf, O_RDONLY, 0);
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if (CHECK(efd < 0, "open", "err %d errno %d\n", efd, errno))
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goto close_prog;
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bytes = read(efd, buf, sizeof(buf));
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close(efd);
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if (CHECK(bytes <= 0 || bytes >= sizeof(buf), "read",
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"bytes %d errno %d\n", bytes, errno))
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goto close_prog;
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attr.config = strtol(buf, NULL, 0);
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attr.type = PERF_TYPE_TRACEPOINT;
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attr.sample_type = PERF_SAMPLE_RAW;
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attr.sample_period = 1;
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attr.wakeup_events = 1;
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/* attach to this pid so the all bpf invocations will be in the
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* cgroup associated with this pid.
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*/
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pmu_fd = syscall(__NR_perf_event_open, &attr, getpid(), -1, -1, 0);
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if (CHECK(pmu_fd < 0, "perf_event_open", "err %d errno %d\n", pmu_fd,
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errno))
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goto close_prog;
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err = ioctl(pmu_fd, PERF_EVENT_IOC_ENABLE, 0);
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if (CHECK(err, "perf_event_ioc_enable", "err %d errno %d\n", err,
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errno))
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goto close_pmu;
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err = ioctl(pmu_fd, PERF_EVENT_IOC_SET_BPF, prog_fd);
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if (CHECK(err, "perf_event_ioc_set_bpf", "err %d errno %d\n", err,
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errno))
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goto close_pmu;
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/* trigger some syscalls */
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sleep(1);
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err = bpf_map_lookup_elem(cgidmap_fd, &key, &kcgid);
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if (CHECK(err, "bpf_map_lookup_elem", "err %d errno %d\n", err, errno))
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goto close_pmu;
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ucgid = get_cgroup_id(TEST_CGROUP);
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if (CHECK(kcgid != ucgid, "compare_cgroup_id",
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"kern cgid %llx user cgid %llx", kcgid, ucgid))
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goto close_pmu;
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exit_code = 0;
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printf("%s:PASS\n", argv[0]);
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close_pmu:
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close(pmu_fd);
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close_prog:
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bpf_object__close(obj);
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cleanup_cgroup_env:
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cleanup_cgroup_environment();
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return exit_code;
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}
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