Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 1 | // syscall_filter_unittest.cpp |
| 2 | // Copyright (C) 2016 The Android Open Source Project |
| 3 | // |
| 4 | // Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | // you may not use this file except in compliance with the License. |
| 6 | // You may obtain a copy of the License at |
| 7 | // |
| 8 | // http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | // |
| 10 | // Unless required by applicable law or agreed to in writing, software |
| 11 | // distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | // See the License for the specific language governing permissions and |
| 14 | // limitations under the License. |
| 15 | // |
| 16 | // Test syscall filtering using gtest. |
| 17 | |
| 18 | #include <asm/unistd.h> |
| 19 | #include <errno.h> |
| 20 | #include <fcntl.h> /* For O_WRONLY. */ |
| 21 | |
| 22 | #include <gtest/gtest.h> |
Jorge Lucangeli Obes | 0745937 | 2016-10-19 15:33:31 -0400 | [diff] [blame] | 23 | #include <string> |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 24 | |
| 25 | #include "bpf.h" |
| 26 | #include "syscall_filter.h" |
| 27 | #include "syscall_filter_unittest_macros.h" |
| 28 | #include "util.h" |
| 29 | |
Jorge Lucangeli Obes | 0745937 | 2016-10-19 15:33:31 -0400 | [diff] [blame] | 30 | TEST(util, parse_constant_unsigned) { |
| 31 | char *end; |
| 32 | long int c = 0; |
| 33 | std::string constant; |
| 34 | |
| 35 | #if defined(BITS32) |
| 36 | constant = "0x80000000"; |
| 37 | c = parse_constant(const_cast<char*>(constant.c_str()), &end); |
| 38 | EXPECT_EQ(0x80000000U, static_cast<unsigned long int>(c)); |
| 39 | |
| 40 | #elif defined(BITS64) |
| 41 | constant = "0x8000000000000000"; |
| 42 | c = parse_constant(const_cast<char*>(constant.c_str()), &end); |
| 43 | EXPECT_EQ(0x8000000000000000UL, static_cast<unsigned long int>(c)); |
| 44 | #endif |
| 45 | } |
| 46 | |
| 47 | TEST(util, parse_constant_unsigned_toobig) { |
| 48 | char *end; |
| 49 | long int c = 0; |
| 50 | std::string constant; |
| 51 | |
| 52 | #if defined(BITS32) |
| 53 | constant = "0x100000000"; // Too big for 32-bit unsigned long int. |
| 54 | c = parse_constant(const_cast<char*>(constant.c_str()), &end); |
| 55 | // Error case should return 0. |
| 56 | EXPECT_EQ(0, c); |
| 57 | |
| 58 | #elif defined(BITS64) |
| 59 | constant = "0x10000000000000000"; |
| 60 | c = parse_constant(const_cast<char*>(constant.c_str()), &end); |
| 61 | // Error case should return 0. |
| 62 | EXPECT_EQ(0, c); |
| 63 | #endif |
| 64 | } |
| 65 | |
| 66 | TEST(util, parse_constant_signed) { |
| 67 | char *end; |
| 68 | long int c = 0; |
| 69 | std::string constant = "-1"; |
| 70 | c = parse_constant(const_cast<char*>(constant.c_str()), &end); |
| 71 | EXPECT_EQ(-1, c); |
| 72 | } |
| 73 | |
| 74 | TEST(util, parse_constant_signed_toonegative) { |
| 75 | char *end; |
| 76 | long int c = 0; |
| 77 | std::string constant; |
| 78 | |
| 79 | #if defined(BITS32) |
| 80 | constant = "-0x80000001"; |
| 81 | c = parse_constant(const_cast<char*>(constant.c_str()), &end); |
| 82 | // Error case should return 0. |
| 83 | EXPECT_EQ(0, c); |
| 84 | |
| 85 | #elif defined(BITS64) |
| 86 | constant = "-0x8000000000000001"; |
| 87 | c = parse_constant(const_cast<char*>(constant.c_str()), &end); |
| 88 | // Error case should return 0. |
| 89 | EXPECT_EQ(0, c); |
| 90 | #endif |
| 91 | } |
| 92 | |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 93 | /* Test that setting one BPF instruction works. */ |
| 94 | TEST(bpf, set_bpf_instr) { |
| 95 | struct sock_filter instr; |
| 96 | unsigned char code = BPF_LD + BPF_W + BPF_ABS; |
| 97 | unsigned int k = 4; |
| 98 | unsigned char jt = 1, jf = 2; |
| 99 | |
| 100 | size_t len = set_bpf_instr(&instr, code, k, jt, jf); |
| 101 | |
| 102 | EXPECT_EQ(len, 1U); |
| 103 | EXPECT_EQ_BLOCK(&instr, code, k, jt, jf); |
| 104 | } |
| 105 | |
| 106 | TEST(bpf, bpf_load_arg) { |
| 107 | struct sock_filter load_arg[BPF_LOAD_ARG_LEN]; |
| 108 | int argidx = 1; |
| 109 | size_t len = bpf_load_arg(load_arg, argidx); |
| 110 | |
| 111 | EXPECT_EQ(len, BPF_LOAD_ARG_LEN); |
| 112 | |
| 113 | #if defined(BITS32) |
| 114 | EXPECT_EQ_STMT(&load_arg[0], BPF_LD + BPF_W + BPF_ABS, LO_ARG(argidx)); |
| 115 | #elif defined(BITS64) |
| 116 | EXPECT_EQ_STMT(&load_arg[0], BPF_LD + BPF_W + BPF_ABS, LO_ARG(argidx)); |
| 117 | EXPECT_EQ_STMT(&load_arg[1], BPF_ST, 0); |
| 118 | EXPECT_EQ_STMT(&load_arg[2], BPF_LD + BPF_W + BPF_ABS, HI_ARG(argidx)); |
| 119 | EXPECT_EQ_STMT(&load_arg[3], BPF_ST, 1); |
| 120 | #endif |
| 121 | } |
| 122 | |
| 123 | TEST(bpf, bpf_comp_jeq) { |
| 124 | struct sock_filter comp_jeq[BPF_COMP_LEN]; |
| 125 | unsigned long c = 1; |
| 126 | unsigned char jt = 1; |
| 127 | unsigned char jf = 2; |
| 128 | |
| 129 | size_t len = bpf_comp_jeq(comp_jeq, c, jt, jf); |
| 130 | |
| 131 | EXPECT_EQ(len, BPF_COMP_LEN); |
| 132 | |
| 133 | #if defined(BITS32) |
| 134 | EXPECT_EQ_BLOCK(&comp_jeq[0], BPF_JMP + BPF_JEQ + BPF_K, c, jt, jf); |
| 135 | #elif defined(BITS64) |
| 136 | EXPECT_EQ_BLOCK(&comp_jeq[0], BPF_JMP + BPF_JEQ + BPF_K, 0, 0, jf + 2); |
| 137 | EXPECT_EQ_STMT(&comp_jeq[1], BPF_LD + BPF_MEM, 0); |
| 138 | EXPECT_EQ_BLOCK(&comp_jeq[2], BPF_JMP + BPF_JEQ + BPF_K, c, jt, jf); |
| 139 | #endif |
| 140 | } |
| 141 | |
| 142 | TEST(bpf, bpf_comp_jset) { |
| 143 | struct sock_filter comp_jset[BPF_COMP_LEN]; |
Jorge Lucangeli Obes | fd6f8e3 | 2016-10-12 11:19:28 -0400 | [diff] [blame] | 144 | unsigned long mask = (1UL << (sizeof(unsigned long) * 8 - 1)) | O_WRONLY; |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 145 | unsigned char jt = 1; |
| 146 | unsigned char jf = 2; |
| 147 | |
| 148 | size_t len = bpf_comp_jset(comp_jset, mask, jt, jf); |
| 149 | |
| 150 | EXPECT_EQ(len, BPF_COMP_LEN); |
| 151 | |
| 152 | #if defined(BITS32) |
| 153 | EXPECT_EQ_BLOCK(&comp_jset[0], BPF_JMP + BPF_JSET + BPF_K, mask, jt, jf); |
| 154 | #elif defined(BITS64) |
Jorge Lucangeli Obes | fd6f8e3 | 2016-10-12 11:19:28 -0400 | [diff] [blame] | 155 | EXPECT_EQ_BLOCK( |
| 156 | &comp_jset[0], BPF_JMP + BPF_JSET + BPF_K, 0x80000000, jt + 2, 0); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 157 | EXPECT_EQ_STMT(&comp_jset[1], BPF_LD + BPF_MEM, 0); |
Jorge Lucangeli Obes | fd6f8e3 | 2016-10-12 11:19:28 -0400 | [diff] [blame] | 158 | EXPECT_EQ_BLOCK(&comp_jset[2], BPF_JMP + BPF_JSET + BPF_K, O_WRONLY, jt, jf); |
| 159 | #endif |
| 160 | } |
| 161 | |
| 162 | TEST(bpf, bpf_comp_jin) { |
| 163 | struct sock_filter comp_jin[BPF_COMP_LEN]; |
| 164 | unsigned long mask = (1UL << (sizeof(unsigned long) * 8 - 1)) | O_WRONLY; |
| 165 | unsigned char jt = 10; |
| 166 | unsigned char jf = 20; |
| 167 | |
| 168 | size_t len = bpf_comp_jin(comp_jin, mask, jt, jf); |
| 169 | |
| 170 | EXPECT_EQ(len, BPF_COMP_LEN); |
| 171 | |
| 172 | #if defined(BITS32) |
| 173 | EXPECT_EQ_BLOCK(&comp_jin[0], BPF_JMP + BPF_JSET + BPF_K, ~mask, jf, jt); |
| 174 | #elif defined(BITS64) |
| 175 | EXPECT_EQ_BLOCK( |
| 176 | &comp_jin[0], BPF_JMP + BPF_JSET + BPF_K, 0x7FFFFFFF, jf + 2, 0); |
| 177 | EXPECT_EQ_STMT(&comp_jin[1], BPF_LD + BPF_MEM, 0); |
| 178 | EXPECT_EQ_BLOCK(&comp_jin[2], BPF_JMP + BPF_JSET + BPF_K, ~O_WRONLY, jf, jt); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 179 | #endif |
| 180 | } |
| 181 | |
| 182 | TEST(bpf, bpf_arg_comp) { |
| 183 | struct sock_filter *arg_comp; |
| 184 | int op = EQ; |
| 185 | int argidx = 1; |
| 186 | unsigned long c = 3; |
| 187 | unsigned int label_id = 0; |
| 188 | |
| 189 | size_t len = bpf_arg_comp(&arg_comp, op, argidx, c, label_id); |
| 190 | |
| 191 | EXPECT_EQ(len, BPF_ARG_COMP_LEN + 1); |
| 192 | |
| 193 | #if defined(BITS32) |
| 194 | EXPECT_EQ_STMT(&arg_comp[0], BPF_LD + BPF_W + BPF_ABS, LO_ARG(argidx)); |
| 195 | EXPECT_EQ_BLOCK(&arg_comp[1], BPF_JMP + BPF_JEQ + BPF_K, c, 1, 0); |
| 196 | EXPECT_JUMP_LBL(&arg_comp[2]); |
| 197 | #elif defined(BITS64) |
| 198 | EXPECT_EQ_STMT(&arg_comp[0], BPF_LD + BPF_W + BPF_ABS, LO_ARG(argidx)); |
| 199 | EXPECT_EQ_STMT(&arg_comp[1], BPF_ST, 0); |
| 200 | EXPECT_EQ_STMT(&arg_comp[2], BPF_LD + BPF_W + BPF_ABS, HI_ARG(argidx)); |
| 201 | EXPECT_EQ_STMT(&arg_comp[3], BPF_ST, 1); |
| 202 | |
| 203 | EXPECT_EQ_BLOCK(&arg_comp[4], BPF_JMP + BPF_JEQ + BPF_K, 0, 0, 2); |
| 204 | EXPECT_EQ_STMT(&arg_comp[5], BPF_LD + BPF_MEM, 0); |
| 205 | EXPECT_EQ_BLOCK(&arg_comp[6], BPF_JMP + BPF_JEQ + BPF_K, c, 1, 0); |
| 206 | EXPECT_JUMP_LBL(&arg_comp[7]); |
| 207 | #endif |
| 208 | free(arg_comp); |
| 209 | } |
| 210 | |
| 211 | TEST(bpf, bpf_validate_arch) { |
| 212 | struct sock_filter validate_arch[ARCH_VALIDATION_LEN]; |
| 213 | |
| 214 | size_t len = bpf_validate_arch(validate_arch); |
| 215 | |
| 216 | EXPECT_EQ(len, ARCH_VALIDATION_LEN); |
| 217 | EXPECT_ARCH_VALIDATION(validate_arch); |
| 218 | } |
| 219 | |
| 220 | TEST(bpf, bpf_allow_syscall) { |
| 221 | struct sock_filter allow_syscall[ALLOW_SYSCALL_LEN]; |
| 222 | int nr = 1; |
| 223 | |
| 224 | size_t len = bpf_allow_syscall(allow_syscall, nr); |
| 225 | |
| 226 | EXPECT_EQ(len, ALLOW_SYSCALL_LEN); |
| 227 | EXPECT_ALLOW_SYSCALL(allow_syscall, nr); |
| 228 | } |
| 229 | |
| 230 | TEST(bpf, bpf_allow_syscall_args) { |
| 231 | struct sock_filter allow_syscall[ALLOW_SYSCALL_LEN]; |
| 232 | int nr = 1; |
| 233 | unsigned int id = 1024; |
| 234 | |
| 235 | size_t len = bpf_allow_syscall_args(allow_syscall, nr, id); |
| 236 | |
| 237 | EXPECT_EQ(len, ALLOW_SYSCALL_LEN); |
| 238 | EXPECT_ALLOW_SYSCALL_ARGS(allow_syscall, nr, id, JUMP_JT, JUMP_JF); |
| 239 | } |
| 240 | |
Jorge Lucangeli Obes | 8cc9d4a | 2016-10-03 10:00:57 -0400 | [diff] [blame] | 241 | class BpfLabelTest : public ::testing::Test { |
| 242 | protected: |
| 243 | virtual void TearDown() { free_label_strings(&labels_); } |
| 244 | struct bpf_labels labels_; |
| 245 | }; |
| 246 | |
| 247 | TEST_F(BpfLabelTest, zero_length_filter) { |
| 248 | int res = bpf_resolve_jumps(&labels_, NULL, 0); |
| 249 | |
| 250 | EXPECT_EQ(res, 0); |
| 251 | EXPECT_EQ(labels_.count, 0U); |
| 252 | } |
| 253 | |
| 254 | TEST_F(BpfLabelTest, single_label) { |
| 255 | struct sock_filter test_label[1]; |
| 256 | |
| 257 | int id = bpf_label_id(&labels_, "test"); |
| 258 | set_bpf_lbl(test_label, id); |
| 259 | int res = bpf_resolve_jumps(&labels_, test_label, 1); |
| 260 | |
| 261 | EXPECT_EQ(res, 0); |
| 262 | EXPECT_EQ(labels_.count, 1U); |
| 263 | } |
| 264 | |
| 265 | TEST_F(BpfLabelTest, repeated_label) { |
| 266 | struct sock_filter test_label[2]; |
| 267 | |
| 268 | int id = bpf_label_id(&labels_, "test"); |
| 269 | set_bpf_lbl(&test_label[0], id); |
| 270 | set_bpf_lbl(&test_label[1], id); |
| 271 | int res = bpf_resolve_jumps(&labels_, test_label, 2); |
| 272 | |
| 273 | EXPECT_EQ(res, -1); |
| 274 | } |
| 275 | |
| 276 | TEST_F(BpfLabelTest, jump_with_no_label) { |
| 277 | struct sock_filter test_jump[1]; |
| 278 | |
| 279 | set_bpf_jump_lbl(test_jump, 14831); |
| 280 | int res = bpf_resolve_jumps(&labels_, test_jump, 1); |
| 281 | |
| 282 | EXPECT_EQ(res, -1); |
| 283 | } |
| 284 | |
| 285 | TEST_F(BpfLabelTest, jump_to_valid_label) { |
| 286 | struct sock_filter test_jump[2]; |
| 287 | |
| 288 | int id = bpf_label_id(&labels_, "test"); |
| 289 | set_bpf_jump_lbl(&test_jump[0], id); |
| 290 | set_bpf_lbl(&test_jump[1], id); |
| 291 | |
| 292 | int res = bpf_resolve_jumps(&labels_, test_jump, 2); |
| 293 | EXPECT_EQ(res, 0); |
| 294 | EXPECT_EQ(labels_.count, 1U); |
| 295 | } |
| 296 | |
| 297 | TEST_F(BpfLabelTest, jump_to_invalid_label) { |
| 298 | struct sock_filter test_jump[2]; |
| 299 | |
| 300 | int id = bpf_label_id(&labels_, "test"); |
| 301 | set_bpf_jump_lbl(&test_jump[0], id + 1); |
| 302 | set_bpf_lbl(&test_jump[1], id); |
| 303 | |
| 304 | int res = bpf_resolve_jumps(&labels_, test_jump, 2); |
| 305 | EXPECT_EQ(res, -1); |
| 306 | } |
| 307 | |
| 308 | TEST_F(BpfLabelTest, jump_to_unresolved_label) { |
| 309 | struct sock_filter test_jump[2]; |
| 310 | |
| 311 | int id = bpf_label_id(&labels_, "test"); |
| 312 | /* Notice the order of the instructions is reversed. */ |
| 313 | set_bpf_lbl(&test_jump[0], id); |
| 314 | set_bpf_jump_lbl(&test_jump[1], id); |
| 315 | |
| 316 | int res = bpf_resolve_jumps(&labels_, test_jump, 2); |
| 317 | EXPECT_EQ(res, -1); |
| 318 | } |
| 319 | |
| 320 | TEST_F(BpfLabelTest, too_many_labels) { |
| 321 | unsigned int i; |
| 322 | char label[20]; |
| 323 | |
| 324 | for (i = 0; i < BPF_LABELS_MAX; i++) { |
| 325 | snprintf(label, 20, "test%u", i); |
| 326 | (void) bpf_label_id(&labels_, label); |
| 327 | } |
| 328 | int id = bpf_label_id(&labels_, "test"); |
| 329 | |
| 330 | /* Insertion failed... */ |
| 331 | EXPECT_EQ(id, -1); |
| 332 | /* ... because the label lookup table is full. */ |
| 333 | EXPECT_EQ(labels_.count, BPF_LABELS_MAX); |
| 334 | } |
| 335 | |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 336 | class ArgFilterTest : public ::testing::Test { |
| 337 | protected: |
| 338 | virtual void TearDown() { free_label_strings(&labels_); } |
| 339 | struct bpf_labels labels_; |
| 340 | }; |
| 341 | |
Jorge Lucangeli Obes | 1a122b8 | 2016-11-01 11:59:33 -0400 | [diff] [blame] | 342 | TEST_F(ArgFilterTest, empty_atom) { |
| 343 | const char* fragment = ""; |
| 344 | int nr = 1; |
| 345 | unsigned int id = 0; |
| 346 | |
| 347 | struct filter_block* block = |
| 348 | compile_section(nr, fragment, id, &labels_, NO_LOGGING); |
| 349 | ASSERT_EQ(block, nullptr); |
| 350 | } |
| 351 | |
| 352 | TEST_F(ArgFilterTest, no_comparison) { |
| 353 | const char* fragment = "arg0"; |
| 354 | int nr = 1; |
| 355 | unsigned int id = 0; |
| 356 | |
| 357 | struct filter_block* block = |
| 358 | compile_section(nr, fragment, id, &labels_, NO_LOGGING); |
| 359 | ASSERT_EQ(block, nullptr); |
| 360 | } |
| 361 | |
| 362 | TEST_F(ArgFilterTest, no_constant) { |
| 363 | const char* fragment = "arg0 =="; |
| 364 | int nr = 1; |
| 365 | unsigned int id = 0; |
| 366 | |
| 367 | struct filter_block* block = |
| 368 | compile_section(nr, fragment, id, &labels_, NO_LOGGING); |
| 369 | ASSERT_EQ(block, nullptr); |
| 370 | } |
| 371 | |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 372 | TEST_F(ArgFilterTest, arg0_equals) { |
| 373 | const char *fragment = "arg0 == 0"; |
| 374 | int nr = 1; |
| 375 | unsigned int id = 0; |
| 376 | struct filter_block *block = |
| 377 | compile_section(nr, fragment, id, &labels_, NO_LOGGING); |
| 378 | |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 379 | ASSERT_NE(block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 380 | size_t exp_total_len = 1 + (BPF_ARG_COMP_LEN + 1) + 2 + 1 + 2; |
| 381 | EXPECT_EQ(block->total_len, exp_total_len); |
| 382 | |
| 383 | /* First block is a label. */ |
| 384 | struct filter_block *curr_block = block; |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 385 | ASSERT_NE(curr_block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 386 | EXPECT_EQ(block->len, 1U); |
| 387 | EXPECT_LBL(curr_block->instrs); |
| 388 | |
| 389 | /* Second block is a comparison. */ |
| 390 | curr_block = block->next; |
| 391 | EXPECT_COMP(curr_block); |
| 392 | |
| 393 | /* Third block is a jump and a label (end of AND group). */ |
| 394 | curr_block = curr_block->next; |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 395 | ASSERT_NE(curr_block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 396 | EXPECT_GROUP_END(curr_block); |
| 397 | |
| 398 | /* Fourth block is SECCOMP_RET_KILL. */ |
| 399 | curr_block = curr_block->next; |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 400 | ASSERT_NE(curr_block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 401 | EXPECT_KILL(curr_block); |
| 402 | |
| 403 | /* Fifth block is "SUCCESS" label and SECCOMP_RET_ALLOW. */ |
| 404 | curr_block = curr_block->next; |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 405 | ASSERT_NE(curr_block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 406 | EXPECT_ALLOW(curr_block); |
| 407 | |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 408 | EXPECT_EQ(curr_block->next, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 409 | |
| 410 | free_block_list(block); |
| 411 | } |
| 412 | |
| 413 | TEST_F(ArgFilterTest, arg0_mask) { |
| 414 | const char *fragment = "arg1 & O_RDWR"; |
| 415 | int nr = 1; |
| 416 | unsigned int id = 0; |
| 417 | struct filter_block *block = |
| 418 | compile_section(nr, fragment, id, &labels_, NO_LOGGING); |
| 419 | |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 420 | ASSERT_NE(block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 421 | size_t exp_total_len = 1 + (BPF_ARG_COMP_LEN + 1) + 2 + 1 + 2; |
| 422 | EXPECT_EQ(block->total_len, exp_total_len); |
| 423 | |
| 424 | /* First block is a label. */ |
| 425 | struct filter_block *curr_block = block; |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 426 | ASSERT_NE(curr_block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 427 | EXPECT_EQ(block->len, 1U); |
| 428 | EXPECT_LBL(curr_block->instrs); |
| 429 | |
| 430 | /* Second block is a comparison. */ |
| 431 | curr_block = block->next; |
| 432 | EXPECT_COMP(curr_block); |
| 433 | |
| 434 | /* Third block is a jump and a label (end of AND group). */ |
| 435 | curr_block = curr_block->next; |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 436 | ASSERT_NE(curr_block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 437 | EXPECT_GROUP_END(curr_block); |
| 438 | |
| 439 | /* Fourth block is SECCOMP_RET_KILL. */ |
| 440 | curr_block = curr_block->next; |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 441 | ASSERT_NE(curr_block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 442 | EXPECT_KILL(curr_block); |
| 443 | |
| 444 | /* Fifth block is "SUCCESS" label and SECCOMP_RET_ALLOW. */ |
| 445 | curr_block = curr_block->next; |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 446 | ASSERT_NE(curr_block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 447 | EXPECT_ALLOW(curr_block); |
| 448 | |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 449 | EXPECT_EQ(curr_block->next, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 450 | |
| 451 | free_block_list(block); |
| 452 | } |
| 453 | |
Jorge Lucangeli Obes | fd6f8e3 | 2016-10-12 11:19:28 -0400 | [diff] [blame] | 454 | TEST_F(ArgFilterTest, arg0_flag_set_inclusion) { |
| 455 | const char *fragment = "arg0 in O_RDONLY|O_CREAT"; |
| 456 | int nr = 1; |
| 457 | unsigned int id = 0; |
| 458 | struct filter_block *block = |
| 459 | compile_section(nr, fragment, id, &labels_, NO_LOGGING); |
| 460 | |
| 461 | ASSERT_NE(block, nullptr); |
| 462 | size_t exp_total_len = 1 + (BPF_ARG_COMP_LEN + 1) + 2 + 1 + 2; |
| 463 | EXPECT_EQ(block->total_len, exp_total_len); |
| 464 | |
| 465 | /* First block is a label. */ |
| 466 | struct filter_block *curr_block = block; |
| 467 | ASSERT_NE(curr_block, nullptr); |
| 468 | EXPECT_EQ(block->len, 1U); |
| 469 | EXPECT_LBL(curr_block->instrs); |
| 470 | |
| 471 | /* Second block is a comparison. */ |
| 472 | curr_block = block->next; |
| 473 | ASSERT_NE(curr_block, nullptr); |
| 474 | EXPECT_COMP(curr_block); |
| 475 | |
| 476 | /* Third block is a jump and a label (end of AND group). */ |
| 477 | curr_block = curr_block->next; |
| 478 | ASSERT_NE(curr_block, nullptr); |
| 479 | EXPECT_GROUP_END(curr_block); |
| 480 | |
| 481 | /* Fourth block is SECCOMP_RET_KILL. */ |
| 482 | curr_block = curr_block->next; |
| 483 | ASSERT_NE(curr_block, nullptr); |
| 484 | EXPECT_KILL(curr_block); |
| 485 | |
| 486 | /* Fifth block is "SUCCESS" label and SECCOMP_RET_ALLOW. */ |
| 487 | curr_block = curr_block->next; |
| 488 | ASSERT_NE(curr_block, nullptr); |
| 489 | EXPECT_ALLOW(curr_block); |
| 490 | |
| 491 | EXPECT_EQ(curr_block->next, nullptr); |
| 492 | |
| 493 | free_block_list(block); |
| 494 | } |
| 495 | |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 496 | TEST_F(ArgFilterTest, arg0_eq_mask) { |
| 497 | const char *fragment = "arg1 == O_WRONLY|O_CREAT"; |
| 498 | int nr = 1; |
| 499 | unsigned int id = 0; |
| 500 | |
| 501 | struct filter_block *block = |
| 502 | compile_section(nr, fragment, id, &labels_, NO_LOGGING); |
| 503 | |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 504 | ASSERT_NE(block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 505 | size_t exp_total_len = 1 + (BPF_ARG_COMP_LEN + 1) + 2 + 1 + 2; |
| 506 | EXPECT_EQ(block->total_len, exp_total_len); |
| 507 | |
| 508 | /* First block is a label. */ |
| 509 | struct filter_block *curr_block = block; |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 510 | ASSERT_NE(curr_block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 511 | EXPECT_EQ(block->len, 1U); |
| 512 | EXPECT_LBL(curr_block->instrs); |
| 513 | |
| 514 | /* Second block is a comparison. */ |
| 515 | curr_block = block->next; |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 516 | ASSERT_NE(curr_block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 517 | EXPECT_COMP(curr_block); |
| 518 | EXPECT_EQ(curr_block->instrs[BPF_ARG_COMP_LEN - 1].k, |
| 519 | (unsigned int)(O_WRONLY | O_CREAT)); |
| 520 | |
| 521 | /* Third block is a jump and a label (end of AND group). */ |
| 522 | curr_block = curr_block->next; |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 523 | ASSERT_NE(curr_block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 524 | EXPECT_GROUP_END(curr_block); |
| 525 | |
| 526 | /* Fourth block is SECCOMP_RET_KILL. */ |
| 527 | curr_block = curr_block->next; |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 528 | ASSERT_NE(curr_block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 529 | EXPECT_KILL(curr_block); |
| 530 | |
| 531 | /* Fifth block is "SUCCESS" label and SECCOMP_RET_ALLOW. */ |
| 532 | curr_block = curr_block->next; |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 533 | ASSERT_NE(curr_block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 534 | EXPECT_ALLOW(curr_block); |
| 535 | |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 536 | EXPECT_EQ(curr_block->next, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 537 | |
| 538 | free_block_list(block); |
| 539 | } |
| 540 | |
| 541 | TEST_F(ArgFilterTest, and_or) { |
| 542 | const char *fragment = "arg0 == 0 && arg1 == 0 || arg0 == 1"; |
| 543 | int nr = 1; |
| 544 | unsigned int id = 0; |
| 545 | |
| 546 | struct filter_block *block = |
| 547 | compile_section(nr, fragment, id, &labels_, NO_LOGGING); |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 548 | ASSERT_NE(block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 549 | size_t exp_total_len = 1 + 3 * (BPF_ARG_COMP_LEN + 1) + 2 + 2 + 1 + 2; |
| 550 | EXPECT_EQ(block->total_len, exp_total_len); |
| 551 | |
| 552 | /* First block is a label. */ |
| 553 | struct filter_block *curr_block = block; |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 554 | ASSERT_NE(curr_block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 555 | EXPECT_EQ(block->len, 1U); |
| 556 | EXPECT_LBL(curr_block->instrs); |
| 557 | |
| 558 | /* Second block is a comparison ("arg0 == 0"). */ |
| 559 | curr_block = curr_block->next; |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 560 | ASSERT_NE(curr_block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 561 | EXPECT_COMP(curr_block); |
| 562 | |
| 563 | /* Third block is a comparison ("arg1 == 0"). */ |
| 564 | curr_block = curr_block->next; |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 565 | ASSERT_NE(curr_block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 566 | EXPECT_COMP(curr_block); |
| 567 | |
| 568 | /* Fourth block is a jump and a label (end of AND group). */ |
| 569 | curr_block = curr_block->next; |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 570 | ASSERT_NE(curr_block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 571 | EXPECT_GROUP_END(curr_block); |
| 572 | |
| 573 | /* Fifth block is a comparison ("arg0 == 1"). */ |
| 574 | curr_block = curr_block->next; |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 575 | ASSERT_NE(curr_block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 576 | EXPECT_COMP(curr_block); |
| 577 | |
| 578 | /* Sixth block is a jump and a label (end of AND group). */ |
| 579 | curr_block = curr_block->next; |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 580 | ASSERT_NE(curr_block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 581 | EXPECT_GROUP_END(curr_block); |
| 582 | |
| 583 | /* Seventh block is SECCOMP_RET_KILL. */ |
| 584 | curr_block = curr_block->next; |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 585 | ASSERT_NE(curr_block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 586 | EXPECT_KILL(curr_block); |
| 587 | |
| 588 | /* Eigth block is "SUCCESS" label and SECCOMP_RET_ALLOW. */ |
| 589 | curr_block = curr_block->next; |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 590 | ASSERT_NE(curr_block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 591 | EXPECT_ALLOW(curr_block); |
| 592 | |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 593 | EXPECT_EQ(curr_block->next, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 594 | |
| 595 | free_block_list(block); |
| 596 | } |
| 597 | |
| 598 | TEST_F(ArgFilterTest, ret_errno) { |
| 599 | const char *fragment = "arg0 == 0 || arg0 == 1; return 1"; |
| 600 | int nr = 1; |
| 601 | unsigned int id = 0; |
| 602 | |
| 603 | struct filter_block *block = |
| 604 | compile_section(nr, fragment, id, &labels_, NO_LOGGING); |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 605 | ASSERT_NE(block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 606 | size_t exp_total_len = 1 + 2 * (BPF_ARG_COMP_LEN + 1) + 2 + 2 + 1 + 2; |
| 607 | EXPECT_EQ(block->total_len, exp_total_len); |
| 608 | |
| 609 | /* First block is a label. */ |
| 610 | struct filter_block *curr_block = block; |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 611 | ASSERT_NE(curr_block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 612 | EXPECT_EQ(block->len, 1U); |
| 613 | EXPECT_LBL(curr_block->instrs); |
| 614 | |
| 615 | /* Second block is a comparison ("arg0 == 0"). */ |
| 616 | curr_block = curr_block->next; |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 617 | ASSERT_NE(curr_block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 618 | EXPECT_COMP(curr_block); |
| 619 | |
| 620 | /* Third block is a jump and a label (end of AND group). */ |
| 621 | curr_block = curr_block->next; |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 622 | ASSERT_NE(curr_block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 623 | EXPECT_GROUP_END(curr_block); |
| 624 | |
| 625 | /* Fourth block is a comparison ("arg0 == 1"). */ |
| 626 | curr_block = curr_block->next; |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 627 | ASSERT_NE(curr_block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 628 | EXPECT_COMP(curr_block); |
| 629 | |
| 630 | /* Fifth block is a jump and a label (end of AND group). */ |
| 631 | curr_block = curr_block->next; |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 632 | ASSERT_NE(curr_block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 633 | EXPECT_GROUP_END(curr_block); |
| 634 | |
| 635 | /* Sixth block is SECCOMP_RET_ERRNO. */ |
| 636 | curr_block = curr_block->next; |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 637 | ASSERT_NE(curr_block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 638 | EXPECT_EQ(curr_block->len, 1U); |
| 639 | EXPECT_EQ_STMT(curr_block->instrs, |
| 640 | BPF_RET + BPF_K, |
| 641 | SECCOMP_RET_ERRNO | (1 & SECCOMP_RET_DATA)); |
| 642 | |
| 643 | /* Seventh block is "SUCCESS" label and SECCOMP_RET_ALLOW. */ |
| 644 | curr_block = curr_block->next; |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 645 | ASSERT_NE(curr_block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 646 | EXPECT_ALLOW(curr_block); |
| 647 | |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 648 | EXPECT_EQ(curr_block->next, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 649 | |
| 650 | free_block_list(block); |
| 651 | } |
| 652 | |
| 653 | TEST_F(ArgFilterTest, unconditional_errno) { |
| 654 | const char *fragment = "return 1"; |
| 655 | int nr = 1; |
| 656 | unsigned int id = 0; |
| 657 | |
| 658 | struct filter_block *block = |
| 659 | compile_section(nr, fragment, id, &labels_, NO_LOGGING); |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 660 | ASSERT_NE(block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 661 | size_t exp_total_len = 2; |
| 662 | EXPECT_EQ(block->total_len, exp_total_len); |
| 663 | |
| 664 | /* First block is a label. */ |
| 665 | struct filter_block *curr_block = block; |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 666 | ASSERT_NE(curr_block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 667 | EXPECT_EQ(block->len, 1U); |
| 668 | EXPECT_LBL(curr_block->instrs); |
| 669 | |
| 670 | /* Second block is SECCOMP_RET_ERRNO. */ |
| 671 | curr_block = curr_block->next; |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 672 | ASSERT_NE(curr_block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 673 | EXPECT_EQ(curr_block->len, 1U); |
| 674 | EXPECT_EQ_STMT(curr_block->instrs, |
| 675 | BPF_RET + BPF_K, |
| 676 | SECCOMP_RET_ERRNO | (1 & SECCOMP_RET_DATA)); |
| 677 | |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 678 | EXPECT_EQ(curr_block->next, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 679 | |
| 680 | free_block_list(block); |
| 681 | } |
| 682 | |
Jorge Lucangeli Obes | 1a122b8 | 2016-11-01 11:59:33 -0400 | [diff] [blame] | 683 | TEST_F(ArgFilterTest, invalid_arg_token) { |
| 684 | const char *fragment = "org0 == 0"; |
| 685 | int nr = 1; |
| 686 | unsigned int id = 0; |
| 687 | |
| 688 | struct filter_block *block = |
| 689 | compile_section(nr, fragment, id, &labels_, NO_LOGGING); |
| 690 | ASSERT_EQ(block, nullptr); |
| 691 | } |
| 692 | |
Jorge Lucangeli Obes | 5389540 | 2016-10-18 12:02:58 -0400 | [diff] [blame] | 693 | TEST_F(ArgFilterTest, invalid_arg_number) { |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 694 | const char *fragment = "argnn == 0"; |
| 695 | int nr = 1; |
| 696 | unsigned int id = 0; |
| 697 | |
| 698 | struct filter_block *block = |
| 699 | compile_section(nr, fragment, id, &labels_, NO_LOGGING); |
Jorge Lucangeli Obes | 5389540 | 2016-10-18 12:02:58 -0400 | [diff] [blame] | 700 | ASSERT_EQ(block, nullptr); |
| 701 | } |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 702 | |
Jorge Lucangeli Obes | 1a122b8 | 2016-11-01 11:59:33 -0400 | [diff] [blame] | 703 | TEST_F(ArgFilterTest, extra_chars_in_arg_token) { |
| 704 | const char* fragment = "arg0n == 0"; |
| 705 | int nr = 1; |
| 706 | unsigned int id = 0; |
| 707 | |
| 708 | struct filter_block* block = |
| 709 | compile_section(nr, fragment, id, &labels_, NO_LOGGING); |
| 710 | ASSERT_EQ(block, nullptr); |
| 711 | } |
| 712 | |
| 713 | TEST_F(ArgFilterTest, invalid_operator) { |
| 714 | const char* fragment = "arg0 invalidop 0"; |
| 715 | int nr = 1; |
| 716 | unsigned int id = 0; |
| 717 | |
| 718 | struct filter_block* block = |
| 719 | compile_section(nr, fragment, id, &labels_, NO_LOGGING); |
| 720 | ASSERT_EQ(block, nullptr); |
| 721 | } |
| 722 | |
Jorge Lucangeli Obes | 5389540 | 2016-10-18 12:02:58 -0400 | [diff] [blame] | 723 | TEST_F(ArgFilterTest, invalid_constant) { |
| 724 | const char *fragment = "arg0 == INVALIDCONSTANT"; |
| 725 | int nr = 1; |
| 726 | unsigned int id = 0; |
| 727 | |
| 728 | struct filter_block* block = |
| 729 | compile_section(nr, fragment, id, &labels_, NO_LOGGING); |
| 730 | ASSERT_EQ(block, nullptr); |
| 731 | } |
| 732 | |
Jorge Lucangeli Obes | 1a122b8 | 2016-11-01 11:59:33 -0400 | [diff] [blame] | 733 | TEST_F(ArgFilterTest, extra_tokens) { |
| 734 | const char* fragment = "arg0 == 0 EXTRATOKEN"; |
| 735 | int nr = 1; |
| 736 | unsigned int id = 0; |
| 737 | |
| 738 | struct filter_block* block = |
| 739 | compile_section(nr, fragment, id, &labels_, NO_LOGGING); |
| 740 | ASSERT_EQ(block, nullptr); |
| 741 | } |
| 742 | |
Jorge Lucangeli Obes | 5389540 | 2016-10-18 12:02:58 -0400 | [diff] [blame] | 743 | TEST_F(ArgFilterTest, invalid_errno) { |
| 744 | const char *fragment = "arg0 == 0 && arg1 == 1; return errno"; |
| 745 | int nr = 1; |
| 746 | unsigned int id = 0; |
| 747 | |
| 748 | struct filter_block *block = |
| 749 | compile_section(nr, fragment, id, &labels_, NO_LOGGING); |
| 750 | ASSERT_EQ(block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 751 | } |
| 752 | |
| 753 | TEST_F(ArgFilterTest, log_no_ret_error) { |
| 754 | const char *fragment = "arg0 == 0"; |
| 755 | int nr = 1; |
| 756 | unsigned int id = 0; |
| 757 | struct filter_block *block = |
| 758 | compile_section(nr, fragment, id, &labels_, USE_LOGGING); |
| 759 | |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 760 | ASSERT_NE(block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 761 | size_t exp_total_len = 1 + (BPF_ARG_COMP_LEN + 1) + 2 + 1 + 2; |
| 762 | EXPECT_EQ(block->total_len, exp_total_len); |
| 763 | |
| 764 | /* First block is a label. */ |
| 765 | struct filter_block *curr_block = block; |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 766 | ASSERT_NE(curr_block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 767 | EXPECT_EQ(block->len, 1U); |
| 768 | EXPECT_LBL(curr_block->instrs); |
| 769 | |
| 770 | /* Second block is a comparison. */ |
| 771 | curr_block = block->next; |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 772 | ASSERT_NE(curr_block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 773 | EXPECT_COMP(curr_block); |
| 774 | |
| 775 | /* Third block is a jump and a label (end of AND group). */ |
| 776 | curr_block = curr_block->next; |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 777 | ASSERT_NE(curr_block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 778 | EXPECT_GROUP_END(curr_block); |
| 779 | |
| 780 | /* Fourth block is SECCOMP_RET_TRAP, with no errno. */ |
| 781 | curr_block = curr_block->next; |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 782 | ASSERT_NE(curr_block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 783 | EXPECT_TRAP(curr_block); |
| 784 | |
| 785 | /* Fifth block is "SUCCESS" label and SECCOMP_RET_ALLOW. */ |
| 786 | curr_block = curr_block->next; |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 787 | ASSERT_NE(curr_block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 788 | EXPECT_ALLOW(curr_block); |
| 789 | |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 790 | EXPECT_EQ(curr_block->next, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 791 | |
| 792 | free_block_list(block); |
| 793 | } |
| 794 | |
| 795 | TEST_F(ArgFilterTest, log_bad_ret_error) { |
| 796 | const char *fragment = "arg0 == 0; return"; |
| 797 | int nr = 1; |
| 798 | unsigned int id = 0; |
| 799 | |
| 800 | struct filter_block *block = |
| 801 | compile_section(nr, fragment, id, &labels_, NO_LOGGING); |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 802 | ASSERT_NE(block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 803 | size_t exp_total_len = 1 + (BPF_ARG_COMP_LEN + 1) + 2 + 1 + 2; |
| 804 | EXPECT_EQ(block->total_len, exp_total_len); |
| 805 | |
| 806 | /* First block is a label. */ |
| 807 | struct filter_block *curr_block = block; |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 808 | ASSERT_NE(curr_block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 809 | EXPECT_EQ(block->len, 1U); |
| 810 | EXPECT_LBL(curr_block->instrs); |
| 811 | |
| 812 | /* Second block is a comparison ("arg0 == 0"). */ |
| 813 | curr_block = curr_block->next; |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 814 | ASSERT_NE(curr_block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 815 | EXPECT_COMP(curr_block); |
| 816 | |
| 817 | /* Third block is a jump and a label (end of AND group). */ |
| 818 | curr_block = curr_block->next; |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 819 | ASSERT_NE(curr_block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 820 | EXPECT_GROUP_END(curr_block); |
| 821 | |
| 822 | /* |
| 823 | * Sixth block is NOT SECCOMP_RET_ERRNO, it should be SECCOMP_RET_KILL. |
| 824 | */ |
| 825 | curr_block = curr_block->next; |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 826 | ASSERT_NE(curr_block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 827 | EXPECT_KILL(curr_block); |
| 828 | |
| 829 | /* Seventh block is "SUCCESS" label and SECCOMP_RET_ALLOW. */ |
| 830 | curr_block = curr_block->next; |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 831 | ASSERT_NE(curr_block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 832 | EXPECT_ALLOW(curr_block); |
| 833 | |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 834 | EXPECT_EQ(curr_block->next, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 835 | |
| 836 | free_block_list(block); |
| 837 | } |
| 838 | |
| 839 | TEST_F(ArgFilterTest, no_log_bad_ret_error) { |
| 840 | const char *fragment = "arg0 == 0; return"; |
| 841 | int nr = 1; |
| 842 | unsigned int id = 0; |
| 843 | |
| 844 | struct filter_block *block = |
| 845 | compile_section(nr, fragment, id, &labels_, USE_LOGGING); |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 846 | ASSERT_NE(block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 847 | size_t exp_total_len = 1 + (BPF_ARG_COMP_LEN + 1) + 2 + 1 + 2; |
| 848 | EXPECT_EQ(block->total_len, exp_total_len); |
| 849 | |
| 850 | /* First block is a label. */ |
| 851 | struct filter_block *curr_block = block; |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 852 | ASSERT_NE(curr_block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 853 | EXPECT_EQ(block->len, 1U); |
| 854 | EXPECT_LBL(curr_block->instrs); |
| 855 | |
| 856 | /* Second block is a comparison ("arg0 == 0"). */ |
| 857 | curr_block = curr_block->next; |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 858 | ASSERT_NE(curr_block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 859 | EXPECT_COMP(curr_block); |
| 860 | |
| 861 | /* Third block is a jump and a label (end of AND group). */ |
| 862 | curr_block = curr_block->next; |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 863 | ASSERT_NE(curr_block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 864 | EXPECT_GROUP_END(curr_block); |
| 865 | |
| 866 | /* |
| 867 | * Sixth block is *not* SECCOMP_RET_ERRNO, it should be |
| 868 | * SECCOMP_RET_TRAP. |
| 869 | */ |
| 870 | curr_block = curr_block->next; |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 871 | ASSERT_NE(curr_block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 872 | EXPECT_TRAP(curr_block); |
| 873 | |
| 874 | /* Seventh block is "SUCCESS" label and SECCOMP_RET_ALLOW. */ |
| 875 | curr_block = curr_block->next; |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 876 | ASSERT_NE(curr_block, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 877 | EXPECT_ALLOW(curr_block); |
| 878 | |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 879 | EXPECT_EQ(curr_block->next, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 880 | |
| 881 | free_block_list(block); |
| 882 | } |
| 883 | |
| 884 | FILE *write_policy_to_pipe(const char *policy, size_t len) { |
| 885 | int pipefd[2]; |
| 886 | if (pipe(pipefd) == -1) { |
| 887 | pwarn("pipe(pipefd) failed"); |
| 888 | return NULL; |
| 889 | } |
| 890 | |
| 891 | size_t i = 0; |
| 892 | unsigned int attempts = 0; |
| 893 | ssize_t ret; |
| 894 | while (i < len) { |
| 895 | ret = write(pipefd[1], &policy[i], len - i); |
| 896 | if (ret == -1) { |
| 897 | close(pipefd[0]); |
| 898 | close(pipefd[1]); |
| 899 | return NULL; |
| 900 | } |
| 901 | |
| 902 | /* If we write 0 bytes three times in a row, fail. */ |
| 903 | if (ret == 0) { |
| 904 | if (++attempts >= 3) { |
| 905 | close(pipefd[0]); |
| 906 | close(pipefd[1]); |
| 907 | warn("write() returned 0 three times in a row"); |
| 908 | return NULL; |
| 909 | } |
| 910 | continue; |
| 911 | } |
| 912 | |
| 913 | attempts = 0; |
| 914 | i += (size_t)ret; |
| 915 | } |
| 916 | |
| 917 | close(pipefd[1]); |
| 918 | return fdopen(pipefd[0], "r"); |
| 919 | } |
| 920 | |
| 921 | TEST(FilterTest, seccomp_mode1) { |
| 922 | struct sock_fprog actual; |
| 923 | const char *policy = |
| 924 | "read: 1\n" |
| 925 | "write: 1\n" |
| 926 | "rt_sigreturn: 1\n" |
| 927 | "exit: 1\n"; |
| 928 | |
| 929 | FILE *policy_file = write_policy_to_pipe(policy, strlen(policy)); |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 930 | ASSERT_NE(policy_file, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 931 | |
Jorge Lucangeli Obes | 713f6fb | 2016-10-03 13:03:25 -0400 | [diff] [blame] | 932 | int res = compile_filter(policy_file, &actual, USE_RET_KILL, NO_LOGGING); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 933 | fclose(policy_file); |
| 934 | |
| 935 | /* |
| 936 | * Checks return value, filter length, and that the filter |
| 937 | * validates arch, loads syscall number, and |
| 938 | * only allows expected syscalls. |
| 939 | */ |
| 940 | ASSERT_EQ(res, 0); |
| 941 | EXPECT_EQ(actual.len, 13); |
| 942 | EXPECT_ARCH_VALIDATION(actual.filter); |
| 943 | EXPECT_EQ_STMT(actual.filter + ARCH_VALIDATION_LEN, |
| 944 | BPF_LD + BPF_W + BPF_ABS, |
| 945 | syscall_nr); |
| 946 | EXPECT_ALLOW_SYSCALL(actual.filter + ARCH_VALIDATION_LEN + 1, __NR_read); |
| 947 | EXPECT_ALLOW_SYSCALL(actual.filter + ARCH_VALIDATION_LEN + 3, __NR_write); |
| 948 | EXPECT_ALLOW_SYSCALL(actual.filter + ARCH_VALIDATION_LEN + 5, |
| 949 | __NR_rt_sigreturn); |
| 950 | EXPECT_ALLOW_SYSCALL(actual.filter + ARCH_VALIDATION_LEN + 7, __NR_exit); |
| 951 | EXPECT_EQ_STMT(actual.filter + ARCH_VALIDATION_LEN + 9, |
| 952 | BPF_RET + BPF_K, |
| 953 | SECCOMP_RET_KILL); |
| 954 | |
| 955 | free(actual.filter); |
| 956 | } |
| 957 | |
Jorge Lucangeli Obes | 713f6fb | 2016-10-03 13:03:25 -0400 | [diff] [blame] | 958 | TEST(FilterTest, seccomp_mode1_trap) { |
| 959 | struct sock_fprog actual; |
| 960 | const char *policy = |
| 961 | "read: 1\n" |
| 962 | "write: 1\n" |
| 963 | "rt_sigreturn: 1\n" |
| 964 | "exit: 1\n"; |
| 965 | |
| 966 | FILE *policy_file = write_policy_to_pipe(policy, strlen(policy)); |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 967 | ASSERT_NE(policy_file, nullptr); |
Jorge Lucangeli Obes | 713f6fb | 2016-10-03 13:03:25 -0400 | [diff] [blame] | 968 | |
| 969 | int res = compile_filter(policy_file, &actual, USE_RET_TRAP, NO_LOGGING); |
| 970 | fclose(policy_file); |
| 971 | |
| 972 | /* |
| 973 | * Checks return value, filter length, and that the filter |
| 974 | * validates arch, loads syscall number, and |
| 975 | * only allows expected syscalls. |
| 976 | */ |
| 977 | ASSERT_EQ(res, 0); |
| 978 | EXPECT_EQ(actual.len, 13); |
| 979 | EXPECT_ARCH_VALIDATION(actual.filter); |
| 980 | EXPECT_EQ_STMT(actual.filter + ARCH_VALIDATION_LEN, |
| 981 | BPF_LD+BPF_W+BPF_ABS, syscall_nr); |
| 982 | EXPECT_ALLOW_SYSCALL(actual.filter + ARCH_VALIDATION_LEN + 1, |
| 983 | __NR_read); |
| 984 | EXPECT_ALLOW_SYSCALL(actual.filter + ARCH_VALIDATION_LEN + 3, |
| 985 | __NR_write); |
| 986 | EXPECT_ALLOW_SYSCALL(actual.filter + ARCH_VALIDATION_LEN + 5, |
| 987 | __NR_rt_sigreturn); |
| 988 | EXPECT_ALLOW_SYSCALL(actual.filter + ARCH_VALIDATION_LEN + 7, |
| 989 | __NR_exit); |
| 990 | EXPECT_EQ_STMT(actual.filter + ARCH_VALIDATION_LEN + 9, BPF_RET+BPF_K, |
| 991 | SECCOMP_RET_TRAP); |
| 992 | |
| 993 | free(actual.filter); |
| 994 | } |
| 995 | |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 996 | TEST(FilterTest, seccomp_read_write) { |
| 997 | struct sock_fprog actual; |
| 998 | const char *policy = |
| 999 | "read: arg0 == 0\n" |
| 1000 | "write: arg0 == 1 || arg0 == 2\n" |
| 1001 | "rt_sigreturn: 1\n" |
| 1002 | "exit: 1\n"; |
| 1003 | |
| 1004 | FILE *policy_file = write_policy_to_pipe(policy, strlen(policy)); |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 1005 | ASSERT_NE(policy_file, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 1006 | |
Jorge Lucangeli Obes | 713f6fb | 2016-10-03 13:03:25 -0400 | [diff] [blame] | 1007 | int res = compile_filter(policy_file, &actual, USE_RET_KILL, NO_LOGGING); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 1008 | fclose(policy_file); |
| 1009 | |
| 1010 | /* |
| 1011 | * Checks return value, filter length, and that the filter |
| 1012 | * validates arch, loads syscall number, and |
| 1013 | * only allows expected syscalls, jumping to correct arg filter |
| 1014 | * offsets. |
| 1015 | */ |
| 1016 | ASSERT_EQ(res, 0); |
| 1017 | size_t exp_total_len = 27 + 3 * (BPF_ARG_COMP_LEN + 1); |
| 1018 | EXPECT_EQ(actual.len, exp_total_len); |
| 1019 | |
| 1020 | EXPECT_ARCH_VALIDATION(actual.filter); |
| 1021 | EXPECT_EQ_STMT(actual.filter + ARCH_VALIDATION_LEN, |
| 1022 | BPF_LD + BPF_W + BPF_ABS, |
| 1023 | syscall_nr); |
| 1024 | EXPECT_ALLOW_SYSCALL_ARGS( |
| 1025 | actual.filter + ARCH_VALIDATION_LEN + 1, __NR_read, 7, 0, 0); |
| 1026 | EXPECT_ALLOW_SYSCALL_ARGS(actual.filter + ARCH_VALIDATION_LEN + 3, |
| 1027 | __NR_write, |
| 1028 | 12 + BPF_ARG_COMP_LEN, |
| 1029 | 0, |
| 1030 | 0); |
| 1031 | EXPECT_ALLOW_SYSCALL(actual.filter + ARCH_VALIDATION_LEN + 5, |
| 1032 | __NR_rt_sigreturn); |
| 1033 | EXPECT_ALLOW_SYSCALL(actual.filter + ARCH_VALIDATION_LEN + 7, __NR_exit); |
| 1034 | EXPECT_EQ_STMT(actual.filter + ARCH_VALIDATION_LEN + 9, |
| 1035 | BPF_RET + BPF_K, |
| 1036 | SECCOMP_RET_KILL); |
| 1037 | |
| 1038 | free(actual.filter); |
| 1039 | } |
| 1040 | |
Jorge Lucangeli Obes | 1a122b8 | 2016-11-01 11:59:33 -0400 | [diff] [blame] | 1041 | TEST(FilterTest, missing_atom) { |
| 1042 | struct sock_fprog actual; |
| 1043 | const char* policy = "open:\n"; |
| 1044 | |
| 1045 | FILE* policy_file = write_policy_to_pipe(policy, strlen(policy)); |
| 1046 | ASSERT_NE(policy_file, nullptr); |
| 1047 | |
| 1048 | int res = compile_filter(policy_file, &actual, 0, NO_LOGGING); |
| 1049 | fclose(policy_file); |
| 1050 | ASSERT_NE(res, 0); |
| 1051 | } |
| 1052 | |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 1053 | TEST(FilterTest, invalid_name) { |
| 1054 | struct sock_fprog actual; |
| 1055 | const char *policy = "notasyscall: 1\n"; |
| 1056 | |
| 1057 | FILE *policy_file = write_policy_to_pipe(policy, strlen(policy)); |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 1058 | ASSERT_NE(policy_file, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 1059 | |
Jorge Lucangeli Obes | 713f6fb | 2016-10-03 13:03:25 -0400 | [diff] [blame] | 1060 | int res = compile_filter(policy_file, &actual, 0, NO_LOGGING); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 1061 | fclose(policy_file); |
| 1062 | ASSERT_NE(res, 0); |
| 1063 | } |
| 1064 | |
| 1065 | TEST(FilterTest, invalid_arg) { |
| 1066 | struct sock_fprog actual; |
| 1067 | const char *policy = "open: argnn ==\n"; |
| 1068 | |
| 1069 | FILE *policy_file = write_policy_to_pipe(policy, strlen(policy)); |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 1070 | ASSERT_NE(policy_file, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 1071 | |
Jorge Lucangeli Obes | 713f6fb | 2016-10-03 13:03:25 -0400 | [diff] [blame] | 1072 | int res = compile_filter(policy_file, &actual, 0, NO_LOGGING); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 1073 | fclose(policy_file); |
| 1074 | ASSERT_NE(res, 0); |
| 1075 | } |
| 1076 | |
| 1077 | TEST(FilterTest, nonexistent) { |
| 1078 | struct sock_fprog actual; |
Jorge Lucangeli Obes | 713f6fb | 2016-10-03 13:03:25 -0400 | [diff] [blame] | 1079 | int res = compile_filter(NULL, &actual, 0, NO_LOGGING); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 1080 | ASSERT_NE(res, 0); |
| 1081 | } |
| 1082 | |
| 1083 | TEST(FilterTest, log) { |
| 1084 | struct sock_fprog actual; |
| 1085 | const char *policy = |
| 1086 | "read: 1\n" |
| 1087 | "write: 1\n" |
| 1088 | "rt_sigreturn: 1\n" |
| 1089 | "exit: 1\n"; |
| 1090 | |
| 1091 | FILE *policy_file = write_policy_to_pipe(policy, strlen(policy)); |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 1092 | ASSERT_NE(policy_file, nullptr); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 1093 | |
Jorge Lucangeli Obes | 713f6fb | 2016-10-03 13:03:25 -0400 | [diff] [blame] | 1094 | int res = compile_filter(policy_file, &actual, USE_RET_TRAP, USE_LOGGING); |
Jorge Lucangeli Obes | 106d97f | 2016-08-19 12:34:02 -0400 | [diff] [blame] | 1095 | fclose(policy_file); |
| 1096 | |
| 1097 | size_t i; |
| 1098 | size_t index = 0; |
| 1099 | /* |
| 1100 | * Checks return value, filter length, and that the filter |
| 1101 | * validates arch, loads syscall number, only allows expected syscalls, |
| 1102 | * and returns TRAP on failure. |
| 1103 | * NOTE(jorgelo): the filter is longer since we add the syscalls needed |
| 1104 | * for logging. |
| 1105 | */ |
| 1106 | ASSERT_EQ(res, 0); |
| 1107 | EXPECT_EQ(actual.len, 13 + 2 * log_syscalls_len); |
| 1108 | EXPECT_ARCH_VALIDATION(actual.filter); |
| 1109 | EXPECT_EQ_STMT(actual.filter + ARCH_VALIDATION_LEN, |
| 1110 | BPF_LD + BPF_W + BPF_ABS, |
| 1111 | syscall_nr); |
| 1112 | |
| 1113 | index = ARCH_VALIDATION_LEN + 1; |
| 1114 | for (i = 0; i < log_syscalls_len; i++) |
| 1115 | EXPECT_ALLOW_SYSCALL(actual.filter + (index + 2 * i), |
| 1116 | lookup_syscall(log_syscalls[i])); |
| 1117 | |
| 1118 | index += 2 * log_syscalls_len; |
| 1119 | |
| 1120 | EXPECT_ALLOW_SYSCALL(actual.filter + index, __NR_read); |
| 1121 | EXPECT_ALLOW_SYSCALL(actual.filter + index + 2, __NR_write); |
| 1122 | EXPECT_ALLOW_SYSCALL(actual.filter + index + 4, __NR_rt_sigreturn); |
| 1123 | EXPECT_ALLOW_SYSCALL(actual.filter + index + 6, __NR_exit); |
| 1124 | EXPECT_EQ_STMT(actual.filter + index + 8, BPF_RET + BPF_K, SECCOMP_RET_TRAP); |
| 1125 | |
| 1126 | free(actual.filter); |
| 1127 | } |
Jorge Lucangeli Obes | 713f6fb | 2016-10-03 13:03:25 -0400 | [diff] [blame] | 1128 | |
| 1129 | TEST(FilterTest, allow_log_but_kill) { |
| 1130 | struct sock_fprog actual; |
| 1131 | const char *policy = |
| 1132 | "read: 1\n" |
| 1133 | "write: 1\n" |
| 1134 | "rt_sigreturn: 1\n" |
| 1135 | "exit: 1\n"; |
| 1136 | |
| 1137 | FILE *policy_file = write_policy_to_pipe(policy, strlen(policy)); |
Jorge Lucangeli Obes | e9740af | 2016-11-02 13:39:24 -0400 | [diff] [blame^] | 1138 | ASSERT_NE(policy_file, nullptr); |
Jorge Lucangeli Obes | 713f6fb | 2016-10-03 13:03:25 -0400 | [diff] [blame] | 1139 | |
| 1140 | int res = compile_filter(policy_file, &actual, USE_RET_KILL, USE_LOGGING); |
| 1141 | fclose(policy_file); |
| 1142 | |
| 1143 | size_t i; |
| 1144 | size_t index = 0; |
| 1145 | /* |
| 1146 | * Checks return value, filter length, and that the filter |
| 1147 | * validates arch, loads syscall number, only allows expected syscalls, |
| 1148 | * and returns TRAP on failure. |
| 1149 | * NOTE(jorgelo): the filter is longer since we add the syscalls needed |
| 1150 | * for logging. |
| 1151 | */ |
| 1152 | ASSERT_EQ(res, 0); |
| 1153 | EXPECT_EQ(actual.len, 13 + 2 * log_syscalls_len); |
| 1154 | EXPECT_ARCH_VALIDATION(actual.filter); |
| 1155 | EXPECT_EQ_STMT(actual.filter + ARCH_VALIDATION_LEN, |
| 1156 | BPF_LD+BPF_W+BPF_ABS, syscall_nr); |
| 1157 | |
| 1158 | index = ARCH_VALIDATION_LEN + 1; |
| 1159 | for (i = 0; i < log_syscalls_len; i++) |
| 1160 | EXPECT_ALLOW_SYSCALL(actual.filter + (index + 2 * i), |
| 1161 | lookup_syscall(log_syscalls[i])); |
| 1162 | |
| 1163 | index += 2 * log_syscalls_len; |
| 1164 | |
| 1165 | EXPECT_ALLOW_SYSCALL(actual.filter + index, __NR_read); |
| 1166 | EXPECT_ALLOW_SYSCALL(actual.filter + index + 2, __NR_write); |
| 1167 | EXPECT_ALLOW_SYSCALL(actual.filter + index + 4, __NR_rt_sigreturn); |
| 1168 | EXPECT_ALLOW_SYSCALL(actual.filter + index + 6, __NR_exit); |
| 1169 | EXPECT_EQ_STMT(actual.filter + index + 8, BPF_RET+BPF_K, |
| 1170 | SECCOMP_RET_KILL); |
| 1171 | |
| 1172 | free(actual.filter); |
| 1173 | } |