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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 | // SPDX-License-Identifier: GPL-2.0 #include <test_progs.h> #include "test_stacktrace_build_id.skel.h" void test_stacktrace_build_id(void) { int control_map_fd, stackid_hmap_fd, stackmap_fd, stack_amap_fd; struct test_stacktrace_build_id *skel; int err, stack_trace_len, build_id_size; __u32 key, prev_key, val, duration = 0; char buf[BPF_BUILD_ID_SIZE]; struct bpf_stack_build_id id_offs[PERF_MAX_STACK_DEPTH]; int build_id_matches = 0; int i, retry = 1; retry: skel = test_stacktrace_build_id__open_and_load(); if (CHECK(!skel, "skel_open_and_load", "skeleton open/load failed\n")) return; err = test_stacktrace_build_id__attach(skel); if (CHECK(err, "attach_tp", "err %d\n", err)) goto cleanup; /* find map fds */ control_map_fd = bpf_map__fd(skel->maps.control_map); stackid_hmap_fd = bpf_map__fd(skel->maps.stackid_hmap); stackmap_fd = bpf_map__fd(skel->maps.stackmap); stack_amap_fd = bpf_map__fd(skel->maps.stack_amap); if (CHECK_FAIL(system("dd if=/dev/urandom of=/dev/zero count=4 2> /dev/null"))) goto cleanup; if (CHECK_FAIL(system("./urandom_read"))) goto cleanup; /* disable stack trace collection */ key = 0; val = 1; bpf_map_update_elem(control_map_fd, &key, &val, 0); /* for every element in stackid_hmap, we can find a corresponding one * in stackmap, and vise versa. */ err = compare_map_keys(stackid_hmap_fd, stackmap_fd); if (CHECK(err, "compare_map_keys stackid_hmap vs. stackmap", "err %d errno %d\n", err, errno)) goto cleanup; err = compare_map_keys(stackmap_fd, stackid_hmap_fd); if (CHECK(err, "compare_map_keys stackmap vs. stackid_hmap", "err %d errno %d\n", err, errno)) goto cleanup; build_id_size = read_build_id("urandom_read", buf, sizeof(buf)); err = build_id_size < 0 ? build_id_size : 0; if (CHECK(err, "read_build_id", "err %d errno %d\n", err, errno)) goto cleanup; err = bpf_map__get_next_key(skel->maps.stackmap, NULL, &key, sizeof(key)); if (CHECK(err, "get_next_key from stackmap", "err %d, errno %d\n", err, errno)) goto cleanup; do { err = bpf_map_lookup_elem(stackmap_fd, &key, id_offs); if (CHECK(err, "lookup_elem from stackmap", "err %d, errno %d\n", err, errno)) goto cleanup; for (i = 0; i < PERF_MAX_STACK_DEPTH; ++i) if (id_offs[i].status == BPF_STACK_BUILD_ID_VALID && id_offs[i].offset != 0) { if (memcmp(buf, id_offs[i].build_id, build_id_size) == 0) build_id_matches = 1; } prev_key = key; } while (bpf_map__get_next_key(skel->maps.stackmap, &prev_key, &key, sizeof(key)) == 0); /* stack_map_get_build_id_offset() is racy and sometimes can return * BPF_STACK_BUILD_ID_IP instead of BPF_STACK_BUILD_ID_VALID; * try it one more time. */ if (build_id_matches < 1 && retry--) { test_stacktrace_build_id__destroy(skel); printf("%s:WARN:Didn't find expected build ID from the map, retrying\n", __func__); goto retry; } if (CHECK(build_id_matches < 1, "build id match", "Didn't find expected build ID from the map\n")) goto cleanup; stack_trace_len = PERF_MAX_STACK_DEPTH * sizeof(struct bpf_stack_build_id); err = compare_stack_ips(stackmap_fd, stack_amap_fd, stack_trace_len); CHECK(err, "compare_stack_ips stackmap vs. stack_amap", "err %d errno %d\n", err, errno); cleanup: test_stacktrace_build_id__destroy(skel); } |