104 lines · c
1// SPDX-License-Identifier: GPL-2.02#include <test_progs.h>3#include "test_stacktrace_build_id.skel.h"4 5void test_stacktrace_build_id(void)6{7 8 int control_map_fd, stackid_hmap_fd, stackmap_fd, stack_amap_fd;9 struct test_stacktrace_build_id *skel;10 int err, stack_trace_len, build_id_size;11 __u32 key, prev_key, val, duration = 0;12 char buf[BPF_BUILD_ID_SIZE];13 struct bpf_stack_build_id id_offs[PERF_MAX_STACK_DEPTH];14 int build_id_matches = 0;15 int i, retry = 1;16 17retry:18 skel = test_stacktrace_build_id__open_and_load();19 if (CHECK(!skel, "skel_open_and_load", "skeleton open/load failed\n"))20 return;21 22 err = test_stacktrace_build_id__attach(skel);23 if (CHECK(err, "attach_tp", "err %d\n", err))24 goto cleanup;25 26 /* find map fds */27 control_map_fd = bpf_map__fd(skel->maps.control_map);28 stackid_hmap_fd = bpf_map__fd(skel->maps.stackid_hmap);29 stackmap_fd = bpf_map__fd(skel->maps.stackmap);30 stack_amap_fd = bpf_map__fd(skel->maps.stack_amap);31 32 if (CHECK_FAIL(system("dd if=/dev/urandom of=/dev/zero count=4 2> /dev/null")))33 goto cleanup;34 if (CHECK_FAIL(system("./urandom_read")))35 goto cleanup;36 /* disable stack trace collection */37 key = 0;38 val = 1;39 bpf_map_update_elem(control_map_fd, &key, &val, 0);40 41 /* for every element in stackid_hmap, we can find a corresponding one42 * in stackmap, and vise versa.43 */44 err = compare_map_keys(stackid_hmap_fd, stackmap_fd);45 if (CHECK(err, "compare_map_keys stackid_hmap vs. stackmap",46 "err %d errno %d\n", err, errno))47 goto cleanup;48 49 err = compare_map_keys(stackmap_fd, stackid_hmap_fd);50 if (CHECK(err, "compare_map_keys stackmap vs. stackid_hmap",51 "err %d errno %d\n", err, errno))52 goto cleanup;53 54 build_id_size = read_build_id("urandom_read", buf, sizeof(buf));55 err = build_id_size < 0 ? build_id_size : 0;56 57 if (CHECK(err, "read_build_id",58 "err %d errno %d\n", err, errno))59 goto cleanup;60 61 err = bpf_map__get_next_key(skel->maps.stackmap, NULL, &key, sizeof(key));62 if (CHECK(err, "get_next_key from stackmap",63 "err %d, errno %d\n", err, errno))64 goto cleanup;65 66 do {67 err = bpf_map_lookup_elem(stackmap_fd, &key, id_offs);68 if (CHECK(err, "lookup_elem from stackmap",69 "err %d, errno %d\n", err, errno))70 goto cleanup;71 for (i = 0; i < PERF_MAX_STACK_DEPTH; ++i)72 if (id_offs[i].status == BPF_STACK_BUILD_ID_VALID &&73 id_offs[i].offset != 0) {74 if (memcmp(buf, id_offs[i].build_id, build_id_size) == 0)75 build_id_matches = 1;76 }77 prev_key = key;78 } while (bpf_map__get_next_key(skel->maps.stackmap, &prev_key, &key, sizeof(key)) == 0);79 80 /* stack_map_get_build_id_offset() is racy and sometimes can return81 * BPF_STACK_BUILD_ID_IP instead of BPF_STACK_BUILD_ID_VALID;82 * try it one more time.83 */84 if (build_id_matches < 1 && retry--) {85 test_stacktrace_build_id__destroy(skel);86 printf("%s:WARN:Didn't find expected build ID from the map, retrying\n",87 __func__);88 goto retry;89 }90 91 if (CHECK(build_id_matches < 1, "build id match",92 "Didn't find expected build ID from the map\n"))93 goto cleanup;94 95 stack_trace_len = PERF_MAX_STACK_DEPTH *96 sizeof(struct bpf_stack_build_id);97 err = compare_stack_ips(stackmap_fd, stack_amap_fd, stack_trace_len);98 CHECK(err, "compare_stack_ips stackmap vs. stack_amap",99 "err %d errno %d\n", err, errno);100 101cleanup:102 test_stacktrace_build_id__destroy(skel);103}104