305 lines
9.1 KiB
C
305 lines
9.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <test_progs.h>
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#include <sys/mman.h>
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#include "test_mmap.skel.h"
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struct map_data {
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__u64 val[512 * 4];
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};
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static size_t roundup_page(size_t sz)
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{
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long page_size = sysconf(_SC_PAGE_SIZE);
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return (sz + page_size - 1) / page_size * page_size;
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}
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void test_mmap(void)
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{
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const size_t bss_sz = roundup_page(sizeof(struct test_mmap__bss));
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const size_t map_sz = roundup_page(sizeof(struct map_data));
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const int zero = 0, one = 1, two = 2, far = 1500;
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const long page_size = sysconf(_SC_PAGE_SIZE);
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int err, duration = 0, i, data_map_fd, data_map_id, tmp_fd, rdmap_fd;
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struct bpf_map *data_map, *bss_map;
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void *bss_mmaped = NULL, *map_mmaped = NULL, *tmp0, *tmp1, *tmp2;
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struct test_mmap__bss *bss_data;
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struct bpf_map_info map_info;
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__u32 map_info_sz = sizeof(map_info);
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struct map_data *map_data;
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struct test_mmap *skel;
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__u64 val = 0;
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skel = test_mmap__open();
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if (CHECK(!skel, "skel_open", "skeleton open failed\n"))
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return;
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err = bpf_map__set_max_entries(skel->maps.rdonly_map, page_size);
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if (CHECK(err != 0, "bpf_map__set_max_entries", "bpf_map__set_max_entries failed\n"))
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goto cleanup;
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/* at least 4 pages of data */
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err = bpf_map__set_max_entries(skel->maps.data_map,
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4 * (page_size / sizeof(u64)));
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if (CHECK(err != 0, "bpf_map__set_max_entries", "bpf_map__set_max_entries failed\n"))
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goto cleanup;
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err = test_mmap__load(skel);
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if (CHECK(err != 0, "skel_load", "skeleton load failed\n"))
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goto cleanup;
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bss_map = skel->maps.bss;
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data_map = skel->maps.data_map;
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data_map_fd = bpf_map__fd(data_map);
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rdmap_fd = bpf_map__fd(skel->maps.rdonly_map);
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tmp1 = mmap(NULL, page_size, PROT_READ | PROT_WRITE, MAP_SHARED, rdmap_fd, 0);
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if (CHECK(tmp1 != MAP_FAILED, "rdonly_write_mmap", "unexpected success\n")) {
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munmap(tmp1, page_size);
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goto cleanup;
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}
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/* now double-check if it's mmap()'able at all */
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tmp1 = mmap(NULL, page_size, PROT_READ, MAP_SHARED, rdmap_fd, 0);
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if (CHECK(tmp1 == MAP_FAILED, "rdonly_read_mmap", "failed: %d\n", errno))
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goto cleanup;
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/* get map's ID */
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memset(&map_info, 0, map_info_sz);
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err = bpf_obj_get_info_by_fd(data_map_fd, &map_info, &map_info_sz);
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if (CHECK(err, "map_get_info", "failed %d\n", errno))
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goto cleanup;
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data_map_id = map_info.id;
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/* mmap BSS map */
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bss_mmaped = mmap(NULL, bss_sz, PROT_READ | PROT_WRITE, MAP_SHARED,
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bpf_map__fd(bss_map), 0);
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if (CHECK(bss_mmaped == MAP_FAILED, "bss_mmap",
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".bss mmap failed: %d\n", errno)) {
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bss_mmaped = NULL;
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goto cleanup;
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}
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/* map as R/W first */
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map_mmaped = mmap(NULL, map_sz, PROT_READ | PROT_WRITE, MAP_SHARED,
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data_map_fd, 0);
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if (CHECK(map_mmaped == MAP_FAILED, "data_mmap",
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"data_map mmap failed: %d\n", errno)) {
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map_mmaped = NULL;
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goto cleanup;
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}
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bss_data = bss_mmaped;
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map_data = map_mmaped;
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CHECK_FAIL(bss_data->in_val);
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CHECK_FAIL(bss_data->out_val);
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CHECK_FAIL(skel->bss->in_val);
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CHECK_FAIL(skel->bss->out_val);
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CHECK_FAIL(map_data->val[0]);
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CHECK_FAIL(map_data->val[1]);
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CHECK_FAIL(map_data->val[2]);
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CHECK_FAIL(map_data->val[far]);
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err = test_mmap__attach(skel);
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if (CHECK(err, "attach_raw_tp", "err %d\n", err))
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goto cleanup;
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bss_data->in_val = 123;
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val = 111;
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CHECK_FAIL(bpf_map_update_elem(data_map_fd, &zero, &val, 0));
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usleep(1);
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CHECK_FAIL(bss_data->in_val != 123);
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CHECK_FAIL(bss_data->out_val != 123);
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CHECK_FAIL(skel->bss->in_val != 123);
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CHECK_FAIL(skel->bss->out_val != 123);
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CHECK_FAIL(map_data->val[0] != 111);
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CHECK_FAIL(map_data->val[1] != 222);
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CHECK_FAIL(map_data->val[2] != 123);
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CHECK_FAIL(map_data->val[far] != 3 * 123);
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CHECK_FAIL(bpf_map_lookup_elem(data_map_fd, &zero, &val));
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CHECK_FAIL(val != 111);
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CHECK_FAIL(bpf_map_lookup_elem(data_map_fd, &one, &val));
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CHECK_FAIL(val != 222);
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CHECK_FAIL(bpf_map_lookup_elem(data_map_fd, &two, &val));
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CHECK_FAIL(val != 123);
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CHECK_FAIL(bpf_map_lookup_elem(data_map_fd, &far, &val));
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CHECK_FAIL(val != 3 * 123);
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/* data_map freeze should fail due to R/W mmap() */
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err = bpf_map_freeze(data_map_fd);
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if (CHECK(!err || errno != EBUSY, "no_freeze",
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"data_map freeze succeeded: err=%d, errno=%d\n", err, errno))
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goto cleanup;
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err = mprotect(map_mmaped, map_sz, PROT_READ);
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if (CHECK(err, "mprotect_ro", "mprotect to r/o failed %d\n", errno))
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goto cleanup;
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/* unmap R/W mapping */
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err = munmap(map_mmaped, map_sz);
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map_mmaped = NULL;
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if (CHECK(err, "data_map_munmap", "data_map munmap failed: %d\n", errno))
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goto cleanup;
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/* re-map as R/O now */
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map_mmaped = mmap(NULL, map_sz, PROT_READ, MAP_SHARED, data_map_fd, 0);
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if (CHECK(map_mmaped == MAP_FAILED, "data_mmap",
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"data_map R/O mmap failed: %d\n", errno)) {
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map_mmaped = NULL;
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goto cleanup;
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}
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err = mprotect(map_mmaped, map_sz, PROT_WRITE);
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if (CHECK(!err, "mprotect_wr", "mprotect() succeeded unexpectedly!\n"))
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goto cleanup;
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err = mprotect(map_mmaped, map_sz, PROT_EXEC);
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if (CHECK(!err, "mprotect_ex", "mprotect() succeeded unexpectedly!\n"))
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goto cleanup;
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map_data = map_mmaped;
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/* map/unmap in a loop to test ref counting */
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for (i = 0; i < 10; i++) {
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int flags = i % 2 ? PROT_READ : PROT_WRITE;
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void *p;
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p = mmap(NULL, map_sz, flags, MAP_SHARED, data_map_fd, 0);
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if (CHECK_FAIL(p == MAP_FAILED))
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goto cleanup;
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err = munmap(p, map_sz);
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if (CHECK_FAIL(err))
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goto cleanup;
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}
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/* data_map freeze should now succeed due to no R/W mapping */
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err = bpf_map_freeze(data_map_fd);
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if (CHECK(err, "freeze", "data_map freeze failed: err=%d, errno=%d\n",
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err, errno))
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goto cleanup;
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/* mapping as R/W now should fail */
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tmp1 = mmap(NULL, map_sz, PROT_READ | PROT_WRITE, MAP_SHARED,
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data_map_fd, 0);
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if (CHECK(tmp1 != MAP_FAILED, "data_mmap", "mmap succeeded\n")) {
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munmap(tmp1, map_sz);
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goto cleanup;
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}
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bss_data->in_val = 321;
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usleep(1);
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CHECK_FAIL(bss_data->in_val != 321);
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CHECK_FAIL(bss_data->out_val != 321);
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CHECK_FAIL(skel->bss->in_val != 321);
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CHECK_FAIL(skel->bss->out_val != 321);
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CHECK_FAIL(map_data->val[0] != 111);
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CHECK_FAIL(map_data->val[1] != 222);
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CHECK_FAIL(map_data->val[2] != 321);
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CHECK_FAIL(map_data->val[far] != 3 * 321);
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/* check some more advanced mmap() manipulations */
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tmp0 = mmap(NULL, 4 * page_size, PROT_READ, MAP_SHARED | MAP_ANONYMOUS,
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-1, 0);
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if (CHECK(tmp0 == MAP_FAILED, "adv_mmap0", "errno %d\n", errno))
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goto cleanup;
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/* map all but last page: pages 1-3 mapped */
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tmp1 = mmap(tmp0, 3 * page_size, PROT_READ, MAP_SHARED | MAP_FIXED,
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data_map_fd, 0);
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if (CHECK(tmp0 != tmp1, "adv_mmap1", "tmp0: %p, tmp1: %p\n", tmp0, tmp1)) {
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munmap(tmp0, 4 * page_size);
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goto cleanup;
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}
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/* unmap second page: pages 1, 3 mapped */
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err = munmap(tmp1 + page_size, page_size);
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if (CHECK(err, "adv_mmap2", "errno %d\n", errno)) {
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munmap(tmp1, 4 * page_size);
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goto cleanup;
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}
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/* map page 2 back */
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tmp2 = mmap(tmp1 + page_size, page_size, PROT_READ,
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MAP_SHARED | MAP_FIXED, data_map_fd, 0);
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if (CHECK(tmp2 == MAP_FAILED, "adv_mmap3", "errno %d\n", errno)) {
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munmap(tmp1, page_size);
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munmap(tmp1 + 2*page_size, 2 * page_size);
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goto cleanup;
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}
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CHECK(tmp1 + page_size != tmp2, "adv_mmap4",
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"tmp1: %p, tmp2: %p\n", tmp1, tmp2);
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/* re-map all 4 pages */
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tmp2 = mmap(tmp1, 4 * page_size, PROT_READ, MAP_SHARED | MAP_FIXED,
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data_map_fd, 0);
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if (CHECK(tmp2 == MAP_FAILED, "adv_mmap5", "errno %d\n", errno)) {
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munmap(tmp1, 4 * page_size); /* unmap page 1 */
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goto cleanup;
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}
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CHECK(tmp1 != tmp2, "adv_mmap6", "tmp1: %p, tmp2: %p\n", tmp1, tmp2);
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map_data = tmp2;
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CHECK_FAIL(bss_data->in_val != 321);
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CHECK_FAIL(bss_data->out_val != 321);
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CHECK_FAIL(skel->bss->in_val != 321);
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CHECK_FAIL(skel->bss->out_val != 321);
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CHECK_FAIL(map_data->val[0] != 111);
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CHECK_FAIL(map_data->val[1] != 222);
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CHECK_FAIL(map_data->val[2] != 321);
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CHECK_FAIL(map_data->val[far] != 3 * 321);
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munmap(tmp2, 4 * page_size);
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/* map all 4 pages, but with pg_off=1 page, should fail */
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tmp1 = mmap(NULL, 4 * page_size, PROT_READ, MAP_SHARED | MAP_FIXED,
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data_map_fd, page_size /* initial page shift */);
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if (CHECK(tmp1 != MAP_FAILED, "adv_mmap7", "unexpected success")) {
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munmap(tmp1, 4 * page_size);
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goto cleanup;
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}
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tmp1 = mmap(NULL, map_sz, PROT_READ, MAP_SHARED, data_map_fd, 0);
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if (CHECK(tmp1 == MAP_FAILED, "last_mmap", "failed %d\n", errno))
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goto cleanup;
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test_mmap__destroy(skel);
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skel = NULL;
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CHECK_FAIL(munmap(bss_mmaped, bss_sz));
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bss_mmaped = NULL;
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CHECK_FAIL(munmap(map_mmaped, map_sz));
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map_mmaped = NULL;
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/* map should be still held by active mmap */
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tmp_fd = bpf_map_get_fd_by_id(data_map_id);
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if (CHECK(tmp_fd < 0, "get_map_by_id", "failed %d\n", errno)) {
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munmap(tmp1, map_sz);
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goto cleanup;
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}
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close(tmp_fd);
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/* this should release data map finally */
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munmap(tmp1, map_sz);
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/* we need to wait for RCU grace period */
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for (i = 0; i < 10000; i++) {
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__u32 id = data_map_id - 1;
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if (bpf_map_get_next_id(id, &id) || id > data_map_id)
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break;
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usleep(1);
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}
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/* should fail to get map FD by non-existing ID */
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tmp_fd = bpf_map_get_fd_by_id(data_map_id);
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if (CHECK(tmp_fd >= 0, "get_map_by_id_after",
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"unexpectedly succeeded %d\n", tmp_fd)) {
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close(tmp_fd);
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goto cleanup;
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}
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cleanup:
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if (bss_mmaped)
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CHECK_FAIL(munmap(bss_mmaped, bss_sz));
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if (map_mmaped)
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CHECK_FAIL(munmap(map_mmaped, map_sz));
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test_mmap__destroy(skel);
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}
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