diff options
| -rw-r--r-- | tools/testing/selftests/bpf/prog_tests/core_reloc.c | 45 | ||||
| -rw-r--r-- | tools/testing/selftests/bpf/prog_tests/mmap.c | 220 | ||||
| -rw-r--r-- | tools/testing/selftests/bpf/progs/test_mmap.c | 45 |
3 files changed, 292 insertions, 18 deletions
diff --git a/tools/testing/selftests/bpf/prog_tests/core_reloc.c b/tools/testing/selftests/bpf/prog_tests/core_reloc.c index f94bd071536b..ec9e2fdd6b89 100644 --- a/tools/testing/selftests/bpf/prog_tests/core_reloc.c +++ b/tools/testing/selftests/bpf/prog_tests/core_reloc.c @@ -1,6 +1,7 @@ // SPDX-License-Identifier: GPL-2.0 #include <test_progs.h> #include "progs/core_reloc_types.h" +#include <sys/mman.h> #define STRUCT_TO_CHAR_PTR(struct_name) (const char *)&(struct struct_name) @@ -453,8 +454,15 @@ struct data { char out[256]; }; +static size_t roundup_page(size_t sz) +{ + long page_size = sysconf(_SC_PAGE_SIZE); + return (sz + page_size - 1) / page_size * page_size; +} + void test_core_reloc(void) { + const size_t mmap_sz = roundup_page(sizeof(struct data)); struct bpf_object_load_attr load_attr = {}; struct core_reloc_test_case *test_case; const char *tp_name, *probe_name; @@ -463,8 +471,8 @@ void test_core_reloc(void) struct bpf_map *data_map; struct bpf_program *prog; struct bpf_object *obj; - const int zero = 0; - struct data data; + struct data *data; + void *mmap_data = NULL; for (i = 0; i < ARRAY_SIZE(test_cases); i++) { test_case = &test_cases[i]; @@ -476,8 +484,7 @@ void test_core_reloc(void) ); obj = bpf_object__open_file(test_case->bpf_obj_file, &opts); - if (CHECK(IS_ERR_OR_NULL(obj), "obj_open", - "failed to open '%s': %ld\n", + if (CHECK(IS_ERR(obj), "obj_open", "failed to open '%s': %ld\n", test_case->bpf_obj_file, PTR_ERR(obj))) continue; @@ -519,24 +526,22 @@ void test_core_reloc(void) if (CHECK(!data_map, "find_data_map", "data map not found\n")) goto cleanup; - memset(&data, 0, sizeof(data)); - memcpy(data.in, test_case->input, test_case->input_len); - - err = bpf_map_update_elem(bpf_map__fd(data_map), - &zero, &data, 0); - if (CHECK(err, "update_data_map", - "failed to update .data map: %d\n", err)) + mmap_data = mmap(NULL, mmap_sz, PROT_READ | PROT_WRITE, + MAP_SHARED, bpf_map__fd(data_map), 0); + if (CHECK(mmap_data == MAP_FAILED, "mmap", + ".bss mmap failed: %d", errno)) { + mmap_data = NULL; goto cleanup; + } + data = mmap_data; + + memset(mmap_data, 0, sizeof(*data)); + memcpy(data->in, test_case->input, test_case->input_len); /* trigger test run */ usleep(1); - err = bpf_map_lookup_elem(bpf_map__fd(data_map), &zero, &data); - if (CHECK(err, "get_result", - "failed to get output data: %d\n", err)) - goto cleanup; - - equal = memcmp(data.out, test_case->output, + equal = memcmp(data->out, test_case->output, test_case->output_len) == 0; if (CHECK(!equal, "check_result", "input/output data don't match\n")) { @@ -548,12 +553,16 @@ void test_core_reloc(void) } for (j = 0; j < test_case->output_len; j++) { printf("output byte #%d: EXP 0x%02hhx GOT 0x%02hhx\n", - j, test_case->output[j], data.out[j]); + j, test_case->output[j], data->out[j]); } goto cleanup; } cleanup: + if (mmap_data) { + CHECK_FAIL(munmap(mmap_data, mmap_sz)); + mmap_data = NULL; + } if (!IS_ERR_OR_NULL(link)) { bpf_link__destroy(link); link = NULL; diff --git a/tools/testing/selftests/bpf/prog_tests/mmap.c b/tools/testing/selftests/bpf/prog_tests/mmap.c new file mode 100644 index 000000000000..051a6d48762c --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/mmap.c @@ -0,0 +1,220 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <test_progs.h> +#include <sys/mman.h> + +struct map_data { + __u64 val[512 * 4]; +}; + +struct bss_data { + __u64 in_val; + __u64 out_val; +}; + +static size_t roundup_page(size_t sz) +{ + long page_size = sysconf(_SC_PAGE_SIZE); + return (sz + page_size - 1) / page_size * page_size; +} + +void test_mmap(void) +{ + const char *file = "test_mmap.o"; + const char *probe_name = "raw_tracepoint/sys_enter"; + const char *tp_name = "sys_enter"; + const size_t bss_sz = roundup_page(sizeof(struct bss_data)); + const size_t map_sz = roundup_page(sizeof(struct map_data)); + const int zero = 0, one = 1, two = 2, far = 1500; + const long page_size = sysconf(_SC_PAGE_SIZE); + int err, duration = 0, i, data_map_fd; + struct bpf_program *prog; + struct bpf_object *obj; + struct bpf_link *link = NULL; + struct bpf_map *data_map, *bss_map; + void *bss_mmaped = NULL, *map_mmaped = NULL, *tmp1, *tmp2; + volatile struct bss_data *bss_data; + volatile struct map_data *map_data; + __u64 val = 0; + + obj = bpf_object__open_file("test_mmap.o", NULL); + if (CHECK(IS_ERR(obj), "obj_open", "failed to open '%s': %ld\n", + file, PTR_ERR(obj))) + return; + prog = bpf_object__find_program_by_title(obj, probe_name); + if (CHECK(!prog, "find_probe", "prog '%s' not found\n", probe_name)) + goto cleanup; + err = bpf_object__load(obj); + if (CHECK(err, "obj_load", "failed to load prog '%s': %d\n", + probe_name, err)) + goto cleanup; + + bss_map = bpf_object__find_map_by_name(obj, "test_mma.bss"); + if (CHECK(!bss_map, "find_bss_map", ".bss map not found\n")) + goto cleanup; + data_map = bpf_object__find_map_by_name(obj, "data_map"); + if (CHECK(!data_map, "find_data_map", "data_map map not found\n")) + goto cleanup; + data_map_fd = bpf_map__fd(data_map); + + bss_mmaped = mmap(NULL, bss_sz, PROT_READ | PROT_WRITE, MAP_SHARED, + bpf_map__fd(bss_map), 0); + if (CHECK(bss_mmaped == MAP_FAILED, "bss_mmap", + ".bss mmap failed: %d\n", errno)) { + bss_mmaped = NULL; + goto cleanup; + } + /* map as R/W first */ + map_mmaped = mmap(NULL, map_sz, PROT_READ | PROT_WRITE, MAP_SHARED, + data_map_fd, 0); + if (CHECK(map_mmaped == MAP_FAILED, "data_mmap", + "data_map mmap failed: %d\n", errno)) { + map_mmaped = NULL; + goto cleanup; + } + + bss_data = bss_mmaped; + map_data = map_mmaped; + + CHECK_FAIL(bss_data->in_val); + CHECK_FAIL(bss_data->out_val); + CHECK_FAIL(map_data->val[0]); + CHECK_FAIL(map_data->val[1]); + CHECK_FAIL(map_data->val[2]); + CHECK_FAIL(map_data->val[far]); + + link = bpf_program__attach_raw_tracepoint(prog, tp_name); + if (CHECK(IS_ERR(link), "attach_raw_tp", "err %ld\n", PTR_ERR(link))) + goto cleanup; + + bss_data->in_val = 123; + val = 111; + CHECK_FAIL(bpf_map_update_elem(data_map_fd, &zero, &val, 0)); + + usleep(1); + + CHECK_FAIL(bss_data->in_val != 123); + CHECK_FAIL(bss_data->out_val != 123); + CHECK_FAIL(map_data->val[0] != 111); + CHECK_FAIL(map_data->val[1] != 222); + CHECK_FAIL(map_data->val[2] != 123); + CHECK_FAIL(map_data->val[far] != 3 * 123); + + CHECK_FAIL(bpf_map_lookup_elem(data_map_fd, &zero, &val)); + CHECK_FAIL(val != 111); + CHECK_FAIL(bpf_map_lookup_elem(data_map_fd, &one, &val)); + CHECK_FAIL(val != 222); + CHECK_FAIL(bpf_map_lookup_elem(data_map_fd, &two, &val)); + CHECK_FAIL(val != 123); + CHECK_FAIL(bpf_map_lookup_elem(data_map_fd, &far, &val)); + CHECK_FAIL(val != 3 * 123); + + /* data_map freeze should fail due to R/W mmap() */ + err = bpf_map_freeze(data_map_fd); + if (CHECK(!err || errno != EBUSY, "no_freeze", + "data_map freeze succeeded: err=%d, errno=%d\n", err, errno)) + goto cleanup; + + /* unmap R/W mapping */ + err = munmap(map_mmaped, map_sz); + map_mmaped = NULL; + if (CHECK(err, "data_map_munmap", "data_map munmap failed: %d\n", errno)) + goto cleanup; + + /* re-map as R/O now */ + map_mmaped = mmap(NULL, map_sz, PROT_READ, MAP_SHARED, data_map_fd, 0); + if (CHECK(map_mmaped == MAP_FAILED, "data_mmap", + "data_map R/O mmap failed: %d\n", errno)) { + map_mmaped = NULL; + goto cleanup; + } + map_data = map_mmaped; + + /* map/unmap in a loop to test ref counting */ + for (i = 0; i < 10; i++) { + int flags = i % 2 ? PROT_READ : PROT_WRITE; + void *p; + + p = mmap(NULL, map_sz, flags, MAP_SHARED, data_map_fd, 0); + if (CHECK_FAIL(p == MAP_FAILED)) + goto cleanup; + err = munmap(p, map_sz); + if (CHECK_FAIL(err)) + goto cleanup; + } + + /* data_map freeze should now succeed due to no R/W mapping */ + err = bpf_map_freeze(data_map_fd); + if (CHECK(err, "freeze", "data_map freeze failed: err=%d, errno=%d\n", + err, errno)) + goto cleanup; + + /* mapping as R/W now should fail */ + tmp1 = mmap(NULL, map_sz, PROT_READ | PROT_WRITE, MAP_SHARED, + data_map_fd, 0); + if (CHECK(tmp1 != MAP_FAILED, "data_mmap", "mmap succeeded\n")) { + munmap(tmp1, map_sz); + goto cleanup; + } + + bss_data->in_val = 321; + usleep(1); + CHECK_FAIL(bss_data->in_val != 321); + CHECK_FAIL(bss_data->out_val != 321); + CHECK_FAIL(map_data->val[0] != 111); + CHECK_FAIL(map_data->val[1] != 222); + CHECK_FAIL(map_data->val[2] != 321); + CHECK_FAIL(map_data->val[far] != 3 * 321); + + /* check some more advanced mmap() manipulations */ + + /* map all but last page: pages 1-3 mapped */ + tmp1 = mmap(NULL, 3 * page_size, PROT_READ, MAP_SHARED, + data_map_fd, 0); + if (CHECK(tmp1 == MAP_FAILED, "adv_mmap1", "errno %d\n", errno)) + goto cleanup; + + /* unmap second page: pages 1, 3 mapped */ + err = munmap(tmp1 + page_size, page_size); + if (CHECK(err, "adv_mmap2", "errno %d\n", errno)) { + munmap(tmp1, map_sz); + goto cleanup; + } + + /* map page 2 back */ + tmp2 = mmap(tmp1 + page_size, page_size, PROT_READ, + MAP_SHARED | MAP_FIXED, data_map_fd, 0); + if (CHECK(tmp2 == MAP_FAILED, "adv_mmap3", "errno %d\n", errno)) { + munmap(tmp1, page_size); + munmap(tmp1 + 2*page_size, page_size); + goto cleanup; + } + CHECK(tmp1 + page_size != tmp2, "adv_mmap4", + "tmp1: %p, tmp2: %p\n", tmp1, tmp2); + + /* re-map all 4 pages */ + tmp2 = mmap(tmp1, 4 * page_size, PROT_READ, MAP_SHARED | MAP_FIXED, + data_map_fd, 0); + if (CHECK(tmp2 == MAP_FAILED, "adv_mmap5", "errno %d\n", errno)) { + munmap(tmp1, 3 * page_size); /* unmap page 1 */ + goto cleanup; + } + CHECK(tmp1 != tmp2, "adv_mmap6", "tmp1: %p, tmp2: %p\n", tmp1, tmp2); + + map_data = tmp2; + CHECK_FAIL(bss_data->in_val != 321); + CHECK_FAIL(bss_data->out_val != 321); + CHECK_FAIL(map_data->val[0] != 111); + CHECK_FAIL(map_data->val[1] != 222); + CHECK_FAIL(map_data->val[2] != 321); + CHECK_FAIL(map_data->val[far] != 3 * 321); + + munmap(tmp2, 4 * page_size); +cleanup: + if (bss_mmaped) + CHECK_FAIL(munmap(bss_mmaped, bss_sz)); + if (map_mmaped) + CHECK_FAIL(munmap(map_mmaped, map_sz)); + if (!IS_ERR_OR_NULL(link)) + bpf_link__destroy(link); + bpf_object__close(obj); +} diff --git a/tools/testing/selftests/bpf/progs/test_mmap.c b/tools/testing/selftests/bpf/progs/test_mmap.c new file mode 100644 index 000000000000..0d2ec9fbcf61 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/test_mmap.c @@ -0,0 +1,45 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (c) 2019 Facebook + +#include <linux/bpf.h> +#include <stdint.h> +#include "bpf_helpers.h" + +char _license[] SEC("license") = "GPL"; + +struct { + __uint(type, BPF_MAP_TYPE_ARRAY); + __uint(max_entries, 512 * 4); /* at least 4 pages of data */ + __uint(map_flags, BPF_F_MMAPABLE); + __type(key, __u32); + __type(value, __u64); +} data_map SEC(".maps"); + +static volatile __u64 in_val; +static volatile __u64 out_val; + +SEC("raw_tracepoint/sys_enter") +int test_mmap(void *ctx) +{ + int zero = 0, one = 1, two = 2, far = 1500; + __u64 val, *p; + + out_val = in_val; + + /* data_map[2] = in_val; */ + bpf_map_update_elem(&data_map, &two, (const void *)&in_val, 0); + + /* data_map[1] = data_map[0] * 2; */ + p = bpf_map_lookup_elem(&data_map, &zero); + if (p) { + val = (*p) * 2; + bpf_map_update_elem(&data_map, &one, &val, 0); + } + + /* data_map[far] = in_val * 3; */ + val = in_val * 3; + bpf_map_update_elem(&data_map, &far, &val, 0); + + return 0; +} + |