map_kptr.c (5568B)
1// SPDX-License-Identifier: GPL-2.0 2#include <test_progs.h> 3#include <network_helpers.h> 4 5#include "map_kptr.skel.h" 6#include "map_kptr_fail.skel.h" 7 8static char log_buf[1024 * 1024]; 9 10struct { 11 const char *prog_name; 12 const char *err_msg; 13} map_kptr_fail_tests[] = { 14 { "size_not_bpf_dw", "kptr access size must be BPF_DW" }, 15 { "non_const_var_off", "kptr access cannot have variable offset" }, 16 { "non_const_var_off_kptr_xchg", "R1 doesn't have constant offset. kptr has to be" }, 17 { "misaligned_access_write", "kptr access misaligned expected=8 off=7" }, 18 { "misaligned_access_read", "kptr access misaligned expected=8 off=1" }, 19 { "reject_var_off_store", "variable untrusted_ptr_ access var_off=(0x0; 0x1e0)" }, 20 { "reject_bad_type_match", "invalid kptr access, R1 type=untrusted_ptr_prog_test_ref_kfunc" }, 21 { "marked_as_untrusted_or_null", "R1 type=untrusted_ptr_or_null_ expected=percpu_ptr_" }, 22 { "correct_btf_id_check_size", "access beyond struct prog_test_ref_kfunc at off 32 size 4" }, 23 { "inherit_untrusted_on_walk", "R1 type=untrusted_ptr_ expected=percpu_ptr_" }, 24 { "reject_kptr_xchg_on_unref", "off=8 kptr isn't referenced kptr" }, 25 { "reject_kptr_get_no_map_val", "arg#0 expected pointer to map value" }, 26 { "reject_kptr_get_no_null_map_val", "arg#0 expected pointer to map value" }, 27 { "reject_kptr_get_no_kptr", "arg#0 no referenced kptr at map value offset=0" }, 28 { "reject_kptr_get_on_unref", "arg#0 no referenced kptr at map value offset=8" }, 29 { "reject_kptr_get_bad_type_match", "kernel function bpf_kfunc_call_test_kptr_get args#0" }, 30 { "mark_ref_as_untrusted_or_null", "R1 type=untrusted_ptr_or_null_ expected=percpu_ptr_" }, 31 { "reject_untrusted_store_to_ref", "store to referenced kptr disallowed" }, 32 { "reject_bad_type_xchg", "invalid kptr access, R2 type=ptr_prog_test_ref_kfunc expected=ptr_prog_test_member" }, 33 { "reject_untrusted_xchg", "R2 type=untrusted_ptr_ expected=ptr_" }, 34 { "reject_member_of_ref_xchg", "invalid kptr access, R2 type=ptr_prog_test_ref_kfunc" }, 35 { "reject_indirect_helper_access", "kptr cannot be accessed indirectly by helper" }, 36 { "reject_indirect_global_func_access", "kptr cannot be accessed indirectly by helper" }, 37 { "kptr_xchg_ref_state", "Unreleased reference id=5 alloc_insn=" }, 38 { "kptr_get_ref_state", "Unreleased reference id=3 alloc_insn=" }, 39}; 40 41static void test_map_kptr_fail_prog(const char *prog_name, const char *err_msg) 42{ 43 LIBBPF_OPTS(bpf_object_open_opts, opts, .kernel_log_buf = log_buf, 44 .kernel_log_size = sizeof(log_buf), 45 .kernel_log_level = 1); 46 struct map_kptr_fail *skel; 47 struct bpf_program *prog; 48 int ret; 49 50 skel = map_kptr_fail__open_opts(&opts); 51 if (!ASSERT_OK_PTR(skel, "map_kptr_fail__open_opts")) 52 return; 53 54 prog = bpf_object__find_program_by_name(skel->obj, prog_name); 55 if (!ASSERT_OK_PTR(prog, "bpf_object__find_program_by_name")) 56 goto end; 57 58 bpf_program__set_autoload(prog, true); 59 60 ret = map_kptr_fail__load(skel); 61 if (!ASSERT_ERR(ret, "map_kptr__load must fail")) 62 goto end; 63 64 if (!ASSERT_OK_PTR(strstr(log_buf, err_msg), "expected error message")) { 65 fprintf(stderr, "Expected: %s\n", err_msg); 66 fprintf(stderr, "Verifier: %s\n", log_buf); 67 } 68 69end: 70 map_kptr_fail__destroy(skel); 71} 72 73static void test_map_kptr_fail(void) 74{ 75 int i; 76 77 for (i = 0; i < ARRAY_SIZE(map_kptr_fail_tests); i++) { 78 if (!test__start_subtest(map_kptr_fail_tests[i].prog_name)) 79 continue; 80 test_map_kptr_fail_prog(map_kptr_fail_tests[i].prog_name, 81 map_kptr_fail_tests[i].err_msg); 82 } 83} 84 85static void test_map_kptr_success(bool test_run) 86{ 87 LIBBPF_OPTS(bpf_test_run_opts, opts, 88 .data_in = &pkt_v4, 89 .data_size_in = sizeof(pkt_v4), 90 .repeat = 1, 91 ); 92 struct map_kptr *skel; 93 int key = 0, ret; 94 char buf[16]; 95 96 skel = map_kptr__open_and_load(); 97 if (!ASSERT_OK_PTR(skel, "map_kptr__open_and_load")) 98 return; 99 100 ret = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.test_map_kptr_ref), &opts); 101 ASSERT_OK(ret, "test_map_kptr_ref refcount"); 102 ASSERT_OK(opts.retval, "test_map_kptr_ref retval"); 103 ret = bpf_prog_test_run_opts(bpf_program__fd(skel->progs.test_map_kptr_ref2), &opts); 104 ASSERT_OK(ret, "test_map_kptr_ref2 refcount"); 105 ASSERT_OK(opts.retval, "test_map_kptr_ref2 retval"); 106 107 if (test_run) 108 return; 109 110 ret = bpf_map__update_elem(skel->maps.array_map, 111 &key, sizeof(key), buf, sizeof(buf), 0); 112 ASSERT_OK(ret, "array_map update"); 113 ret = bpf_map__update_elem(skel->maps.array_map, 114 &key, sizeof(key), buf, sizeof(buf), 0); 115 ASSERT_OK(ret, "array_map update2"); 116 117 ret = bpf_map__update_elem(skel->maps.hash_map, 118 &key, sizeof(key), buf, sizeof(buf), 0); 119 ASSERT_OK(ret, "hash_map update"); 120 ret = bpf_map__delete_elem(skel->maps.hash_map, &key, sizeof(key), 0); 121 ASSERT_OK(ret, "hash_map delete"); 122 123 ret = bpf_map__update_elem(skel->maps.hash_malloc_map, 124 &key, sizeof(key), buf, sizeof(buf), 0); 125 ASSERT_OK(ret, "hash_malloc_map update"); 126 ret = bpf_map__delete_elem(skel->maps.hash_malloc_map, &key, sizeof(key), 0); 127 ASSERT_OK(ret, "hash_malloc_map delete"); 128 129 ret = bpf_map__update_elem(skel->maps.lru_hash_map, 130 &key, sizeof(key), buf, sizeof(buf), 0); 131 ASSERT_OK(ret, "lru_hash_map update"); 132 ret = bpf_map__delete_elem(skel->maps.lru_hash_map, &key, sizeof(key), 0); 133 ASSERT_OK(ret, "lru_hash_map delete"); 134 135 map_kptr__destroy(skel); 136} 137 138void test_map_kptr(void) 139{ 140 if (test__start_subtest("success")) { 141 test_map_kptr_success(false); 142 /* Do test_run twice, so that we see refcount going back to 1 143 * after we leave it in map from first iteration. 144 */ 145 test_map_kptr_success(true); 146 } 147 test_map_kptr_fail(); 148}