bpf/prog_tests/dynptr.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 /* Copyright (c) 2022 Facebook */
0003
0004 #include <test_progs.h>
0005 #include "dynptr_fail.skel.h"
0006 #include "dynptr_success.skel.h"
0007
0008 static size_t log_buf_sz = 1048576; /* 1 MB */
0009 static char obj_log_buf[1048576];
0010
0011 static struct {
0012     const char *prog_name;
0013     const char *expected_err_msg;
0014 } dynptr_tests[] = {
0015     /* failure cases */
0016     {"ringbuf_missing_release1", "Unreleased reference id=1"},
0017     {"ringbuf_missing_release2", "Unreleased reference id=2"},
0018     {"ringbuf_missing_release_callback", "Unreleased reference id"},
0019     {"use_after_invalid", "Expected an initialized dynptr as arg #3"},
0020     {"ringbuf_invalid_api", "type=mem expected=alloc_mem"},
0021     {"add_dynptr_to_map1", "invalid indirect read from stack"},
0022     {"add_dynptr_to_map2", "invalid indirect read from stack"},
0023     {"data_slice_out_of_bounds_ringbuf", "value is outside of the allowed memory range"},
0024     {"data_slice_out_of_bounds_map_value", "value is outside of the allowed memory range"},
0025     {"data_slice_use_after_release", "invalid mem access 'scalar'"},
0026     {"data_slice_missing_null_check1", "invalid mem access 'mem_or_null'"},
0027     {"data_slice_missing_null_check2", "invalid mem access 'mem_or_null'"},
0028     {"invalid_helper1", "invalid indirect read from stack"},
0029     {"invalid_helper2", "Expected an initialized dynptr as arg #3"},
0030     {"invalid_write1", "Expected an initialized dynptr as arg #1"},
0031     {"invalid_write2", "Expected an initialized dynptr as arg #3"},
0032     {"invalid_write3", "Expected an initialized ringbuf dynptr as arg #1"},
0033     {"invalid_write4", "arg 1 is an unacquired reference"},
0034     {"invalid_read1", "invalid read from stack"},
0035     {"invalid_read2", "cannot pass in dynptr at an offset"},
0036     {"invalid_read3", "invalid read from stack"},
0037     {"invalid_read4", "invalid read from stack"},
0038     {"invalid_offset", "invalid write to stack"},
0039     {"global", "type=map_value expected=fp"},
0040     {"release_twice", "arg 1 is an unacquired reference"},
0041     {"release_twice_callback", "arg 1 is an unacquired reference"},
0042     {"dynptr_from_mem_invalid_api",
0043         "Unsupported reg type fp for bpf_dynptr_from_mem data"},
0044
0045     /* success cases */
0046     {"test_read_write", NULL},
0047     {"test_data_slice", NULL},
0048     {"test_ringbuf", NULL},
0049 };
0050
0051 static void verify_fail(const char *prog_name, const char *expected_err_msg)
0052 {
0053     LIBBPF_OPTS(bpf_object_open_opts, opts);
0054     struct bpf_program *prog;
0055     struct dynptr_fail *skel;
0056     int err;
0057
0058     opts.kernel_log_buf = obj_log_buf;
0059     opts.kernel_log_size = log_buf_sz;
0060     opts.kernel_log_level = 1;
0061
0062     skel = dynptr_fail__open_opts(&opts);
0063     if (!ASSERT_OK_PTR(skel, "dynptr_fail__open_opts"))
0064         goto cleanup;
0065
0066     prog = bpf_object__find_program_by_name(skel->obj, prog_name);
0067     if (!ASSERT_OK_PTR(prog, "bpf_object__find_program_by_name"))
0068         goto cleanup;
0069
0070     bpf_program__set_autoload(prog, true);
0071
0072     bpf_map__set_max_entries(skel->maps.ringbuf, getpagesize());
0073
0074     err = dynptr_fail__load(skel);
0075     if (!ASSERT_ERR(err, "unexpected load success"))
0076         goto cleanup;
0077
0078     if (!ASSERT_OK_PTR(strstr(obj_log_buf, expected_err_msg), "expected_err_msg")) {
0079         fprintf(stderr, "Expected err_msg: %s\n", expected_err_msg);
0080         fprintf(stderr, "Verifier output: %s\n", obj_log_buf);
0081     }
0082
0083 cleanup:
0084     dynptr_fail__destroy(skel);
0085 }
0086
0087 static void verify_success(const char *prog_name)
0088 {
0089     struct dynptr_success *skel;
0090     struct bpf_program *prog;
0091     struct bpf_link *link;
0092
0093     skel = dynptr_success__open();
0094     if (!ASSERT_OK_PTR(skel, "dynptr_success__open"))
0095         return;
0096
0097     skel->bss->pid = getpid();
0098
0099     bpf_map__set_max_entries(skel->maps.ringbuf, getpagesize());
0100
0101     dynptr_success__load(skel);
0102     if (!ASSERT_OK_PTR(skel, "dynptr_success__load"))
0103         goto cleanup;
0104
0105     prog = bpf_object__find_program_by_name(skel->obj, prog_name);
0106     if (!ASSERT_OK_PTR(prog, "bpf_object__find_program_by_name"))
0107         goto cleanup;
0108
0109     link = bpf_program__attach(prog);
0110     if (!ASSERT_OK_PTR(link, "bpf_program__attach"))
0111         goto cleanup;
0112
0113     usleep(1);
0114
0115     ASSERT_EQ(skel->bss->err, 0, "err");
0116
0117     bpf_link__destroy(link);
0118
0119 cleanup:
0120     dynptr_success__destroy(skel);
0121 }
0122
0123 void test_dynptr(void)
0124 {
0125     int i;
0126
0127     for (i = 0; i < ARRAY_SIZE(dynptr_tests); i++) {
0128         if (!test__start_subtest(dynptr_tests[i].prog_name))
0129             continue;
0130
0131         if (dynptr_tests[i].expected_err_msg)
0132             verify_fail(dynptr_tests[i].prog_name,
0133                     dynptr_tests[i].expected_err_msg);
0134         else
0135             verify_success(dynptr_tests[i].prog_name);
0136     }
0137 }