mirror of https://gitee.com/openkylin/linux.git
134 lines
4.1 KiB
C
134 lines
4.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <test_progs.h>
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void test_stacktrace_build_id(void)
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{
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int control_map_fd, stackid_hmap_fd, stackmap_fd, stack_amap_fd;
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const char *prog_name = "tracepoint/random/urandom_read";
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const char *file = "./test_stacktrace_build_id.o";
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int err, prog_fd, stack_trace_len;
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__u32 key, previous_key, val, duration = 0;
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struct bpf_program *prog;
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struct bpf_object *obj;
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struct bpf_link *link = NULL;
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char buf[256];
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int i, j;
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struct bpf_stack_build_id id_offs[PERF_MAX_STACK_DEPTH];
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int build_id_matches = 0;
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int retry = 1;
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retry:
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err = bpf_prog_load(file, BPF_PROG_TYPE_TRACEPOINT, &obj, &prog_fd);
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if (CHECK(err, "prog_load", "err %d errno %d\n", err, errno))
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return;
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prog = bpf_object__find_program_by_title(obj, prog_name);
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if (CHECK(!prog, "find_prog", "prog '%s' not found\n", prog_name))
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goto close_prog;
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link = bpf_program__attach_tracepoint(prog, "random", "urandom_read");
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if (CHECK(IS_ERR(link), "attach_tp", "err %ld\n", PTR_ERR(link)))
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goto close_prog;
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/* find map fds */
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control_map_fd = bpf_find_map(__func__, obj, "control_map");
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if (CHECK(control_map_fd < 0, "bpf_find_map control_map",
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"err %d errno %d\n", err, errno))
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goto disable_pmu;
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stackid_hmap_fd = bpf_find_map(__func__, obj, "stackid_hmap");
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if (CHECK(stackid_hmap_fd < 0, "bpf_find_map stackid_hmap",
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"err %d errno %d\n", err, errno))
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goto disable_pmu;
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stackmap_fd = bpf_find_map(__func__, obj, "stackmap");
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if (CHECK(stackmap_fd < 0, "bpf_find_map stackmap", "err %d errno %d\n",
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err, errno))
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goto disable_pmu;
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stack_amap_fd = bpf_find_map(__func__, obj, "stack_amap");
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if (CHECK(stack_amap_fd < 0, "bpf_find_map stack_amap",
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"err %d errno %d\n", err, errno))
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goto disable_pmu;
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if (CHECK_FAIL(system("dd if=/dev/urandom of=/dev/zero count=4 2> /dev/null")))
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goto disable_pmu;
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if (CHECK_FAIL(system("./urandom_read")))
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goto disable_pmu;
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/* disable stack trace collection */
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key = 0;
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val = 1;
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bpf_map_update_elem(control_map_fd, &key, &val, 0);
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/* for every element in stackid_hmap, we can find a corresponding one
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* in stackmap, and vise versa.
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*/
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err = compare_map_keys(stackid_hmap_fd, stackmap_fd);
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if (CHECK(err, "compare_map_keys stackid_hmap vs. stackmap",
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"err %d errno %d\n", err, errno))
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goto disable_pmu;
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err = compare_map_keys(stackmap_fd, stackid_hmap_fd);
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if (CHECK(err, "compare_map_keys stackmap vs. stackid_hmap",
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"err %d errno %d\n", err, errno))
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goto disable_pmu;
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err = extract_build_id(buf, 256);
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if (CHECK(err, "get build_id with readelf",
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"err %d errno %d\n", err, errno))
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goto disable_pmu;
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err = bpf_map_get_next_key(stackmap_fd, NULL, &key);
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if (CHECK(err, "get_next_key from stackmap",
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"err %d, errno %d\n", err, errno))
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goto disable_pmu;
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do {
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char build_id[64];
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err = bpf_map_lookup_elem(stackmap_fd, &key, id_offs);
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if (CHECK(err, "lookup_elem from stackmap",
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"err %d, errno %d\n", err, errno))
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goto disable_pmu;
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for (i = 0; i < PERF_MAX_STACK_DEPTH; ++i)
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if (id_offs[i].status == BPF_STACK_BUILD_ID_VALID &&
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id_offs[i].offset != 0) {
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for (j = 0; j < 20; ++j)
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sprintf(build_id + 2 * j, "%02x",
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id_offs[i].build_id[j] & 0xff);
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if (strstr(buf, build_id) != NULL)
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build_id_matches = 1;
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}
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previous_key = key;
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} while (bpf_map_get_next_key(stackmap_fd, &previous_key, &key) == 0);
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/* stack_map_get_build_id_offset() is racy and sometimes can return
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* BPF_STACK_BUILD_ID_IP instead of BPF_STACK_BUILD_ID_VALID;
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* try it one more time.
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*/
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if (build_id_matches < 1 && retry--) {
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bpf_link__destroy(link);
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bpf_object__close(obj);
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printf("%s:WARN:Didn't find expected build ID from the map, retrying\n",
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__func__);
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goto retry;
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}
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if (CHECK(build_id_matches < 1, "build id match",
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"Didn't find expected build ID from the map\n"))
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goto disable_pmu;
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stack_trace_len = PERF_MAX_STACK_DEPTH
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* sizeof(struct bpf_stack_build_id);
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err = compare_stack_ips(stackmap_fd, stack_amap_fd, stack_trace_len);
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CHECK(err, "compare_stack_ips stackmap vs. stack_amap",
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"err %d errno %d\n", err, errno);
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disable_pmu:
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bpf_link__destroy(link);
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close_prog:
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bpf_object__close(obj);
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}
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