Jorge Lucangeli Obes | fc8ab53 | 2012-03-20 10:14:31 -0700 | [diff] [blame] | 1 | /* syscall_filter_unittest.c |
Jorge Lucangeli Obes | 6135db9 | 2012-07-27 13:37:30 -0700 | [diff] [blame] | 2 | * Copyright (c) 2012 The Chromium OS Authors. All rights reserved. |
Jorge Lucangeli Obes | fc8ab53 | 2012-03-20 10:14:31 -0700 | [diff] [blame] | 3 | * Use of this source code is governed by a BSD-style license that can be |
| 4 | * found in the LICENSE file. |
| 5 | * |
| 6 | * Test syscall filtering. |
| 7 | */ |
| 8 | |
Jorge Lucangeli Obes | d446726 | 2012-03-23 16:19:59 -0700 | [diff] [blame] | 9 | #include <asm/unistd.h> |
Jorge Lucangeli Obes | fc8ab53 | 2012-03-20 10:14:31 -0700 | [diff] [blame] | 10 | #include <errno.h> |
Jorge Lucangeli Obes | ffec891 | 2012-11-30 14:46:23 -0800 | [diff] [blame] | 11 | #include <fcntl.h> /* For O_WRONLY */ |
Jorge Lucangeli Obes | fc8ab53 | 2012-03-20 10:14:31 -0700 | [diff] [blame] | 12 | |
| 13 | #include "test_harness.h" |
| 14 | |
| 15 | #include "bpf.h" |
| 16 | #include "syscall_filter.h" |
| 17 | |
Jorge Lucangeli Obes | bda833c | 2012-07-31 16:25:56 -0700 | [diff] [blame] | 18 | #include "util.h" |
| 19 | |
Jorge Lucangeli Obes | fc8ab53 | 2012-03-20 10:14:31 -0700 | [diff] [blame] | 20 | /* BPF testing macros. */ |
| 21 | #define EXPECT_EQ_BLOCK(_block, _code, _k, _jt, _jf) \ |
| 22 | do { \ |
| 23 | EXPECT_EQ((_block)->code, _code); \ |
| 24 | EXPECT_EQ((_block)->k, (unsigned int)(_k)); \ |
| 25 | EXPECT_EQ((_block)->jt, _jt); \ |
| 26 | EXPECT_EQ((_block)->jf, _jf); \ |
| 27 | } while (0) |
| 28 | |
| 29 | #define EXPECT_EQ_STMT(_block, _code, _k) \ |
| 30 | EXPECT_EQ_BLOCK(_block, _code, _k, 0, 0) |
| 31 | |
| 32 | #define EXPECT_COMP(_block) \ |
| 33 | do { \ |
| 34 | EXPECT_EQ((_block)->len, BPF_ARG_COMP_LEN + 1); \ |
| 35 | EXPECT_EQ((_block)->instrs->code, BPF_LD+BPF_W+BPF_ABS); \ |
| 36 | } while (0) |
| 37 | |
| 38 | #define EXPECT_LBL(_block) \ |
| 39 | do { \ |
| 40 | EXPECT_EQ((_block)->code, BPF_JMP+BPF_JA); \ |
| 41 | EXPECT_EQ((_block)->jt, LABEL_JT); \ |
| 42 | EXPECT_EQ((_block)->jf, LABEL_JF); \ |
| 43 | } while (0) |
| 44 | |
| 45 | #define EXPECT_JUMP_LBL(_block) \ |
| 46 | do { \ |
| 47 | EXPECT_EQ((_block)->code, BPF_JMP+BPF_JA); \ |
| 48 | EXPECT_EQ((_block)->jt, JUMP_JT); \ |
| 49 | EXPECT_EQ((_block)->jf, JUMP_JF); \ |
| 50 | } while (0) |
| 51 | |
| 52 | #define EXPECT_GROUP_END(_block) \ |
| 53 | do { \ |
| 54 | EXPECT_EQ((_block)->len, 2U); \ |
| 55 | EXPECT_JUMP_LBL(&(_block)->instrs[0]); \ |
| 56 | EXPECT_LBL(&(_block)->instrs[1]); \ |
| 57 | } while (0) |
| 58 | |
| 59 | #define EXPECT_KILL(_block) \ |
| 60 | do { \ |
| 61 | EXPECT_EQ((_block)->len, 1U); \ |
| 62 | EXPECT_EQ_STMT(_block->instrs, \ |
| 63 | BPF_RET+BPF_K, SECCOMP_RET_KILL); \ |
| 64 | } while (0) |
| 65 | |
| 66 | #define EXPECT_ALLOW(_block) \ |
| 67 | do { \ |
| 68 | EXPECT_EQ((_block)->len, 2U); \ |
| 69 | EXPECT_LBL(&(_block)->instrs[0]); \ |
| 70 | EXPECT_EQ_STMT(&(_block)->instrs[1], \ |
| 71 | BPF_RET+BPF_K, SECCOMP_RET_ALLOW); \ |
| 72 | } while (0) |
| 73 | |
Jorge Lucangeli Obes | d446726 | 2012-03-23 16:19:59 -0700 | [diff] [blame] | 74 | #define EXPECT_ARCH_VALIDATION(_filter) \ |
| 75 | do { \ |
| 76 | EXPECT_EQ_STMT(&(_filter)[0], BPF_LD+BPF_W+BPF_ABS, arch_nr); \ |
| 77 | EXPECT_EQ_BLOCK(&(_filter)[1], \ |
| 78 | BPF_JMP+BPF_JEQ+BPF_K, ARCH_NR, SKIP, NEXT); \ |
| 79 | EXPECT_EQ_STMT(&(_filter)[2], BPF_RET+BPF_K, SECCOMP_RET_KILL); \ |
| 80 | } while (0) |
| 81 | |
| 82 | #define EXPECT_ALLOW_SYSCALL(_filter, _nr) \ |
| 83 | do { \ |
| 84 | EXPECT_EQ_BLOCK(&(_filter)[0], \ |
| 85 | BPF_JMP+BPF_JEQ+BPF_K, (_nr), NEXT, SKIP); \ |
| 86 | EXPECT_EQ_STMT(&(_filter)[1], \ |
| 87 | BPF_RET+BPF_K, SECCOMP_RET_ALLOW); \ |
| 88 | } while (0) |
| 89 | |
| 90 | #define EXPECT_ALLOW_SYSCALL_ARGS(_filter, _nr, _id, _jt, _jf) \ |
| 91 | do { \ |
| 92 | EXPECT_EQ_BLOCK(&(_filter)[0], \ |
| 93 | BPF_JMP+BPF_JEQ+BPF_K, (_nr), NEXT, SKIP); \ |
| 94 | EXPECT_EQ_BLOCK(&(_filter)[1], \ |
| 95 | BPF_JMP+BPF_JA, (_id), (_jt), (_jf)); \ |
| 96 | } while (0) |
| 97 | |
| 98 | |
Jorge Lucangeli Obes | fc8ab53 | 2012-03-20 10:14:31 -0700 | [diff] [blame] | 99 | FIXTURE(bpf) {}; |
| 100 | |
| 101 | FIXTURE_SETUP(bpf) {} |
| 102 | FIXTURE_TEARDOWN(bpf) {} |
| 103 | |
Jorge Lucangeli Obes | ffec891 | 2012-11-30 14:46:23 -0800 | [diff] [blame] | 104 | /* Test that setting one BPF instruction works. */ |
Jorge Lucangeli Obes | fc8ab53 | 2012-03-20 10:14:31 -0700 | [diff] [blame] | 105 | TEST_F(bpf, set_bpf_instr) { |
| 106 | struct sock_filter instr; |
| 107 | unsigned char code = BPF_LD+BPF_W+BPF_ABS; |
| 108 | unsigned int k = 4; |
| 109 | unsigned char jt = 1, jf = 2; |
| 110 | |
| 111 | size_t len = set_bpf_instr(&instr, code, k, jt, jf); |
| 112 | |
| 113 | EXPECT_EQ(len, 1U); |
| 114 | EXPECT_EQ_BLOCK(&instr, code, k, jt, jf); |
| 115 | } |
| 116 | |
| 117 | TEST_F(bpf, bpf_load_arg) { |
| 118 | struct sock_filter load_arg[BPF_LOAD_ARG_LEN]; |
| 119 | int argidx = 1; |
| 120 | size_t len = bpf_load_arg(load_arg, argidx); |
| 121 | |
| 122 | EXPECT_EQ(len, BPF_LOAD_ARG_LEN); |
Jorge Lucangeli Obes | edb1d8e | 2012-04-26 10:05:09 -0700 | [diff] [blame] | 123 | |
| 124 | #if defined(BITS32) |
| 125 | EXPECT_EQ_STMT(&load_arg[0], BPF_LD+BPF_W+BPF_ABS, LO_ARG(argidx)); |
| 126 | #elif defined(BITS64) |
Jorge Lucangeli Obes | fc8ab53 | 2012-03-20 10:14:31 -0700 | [diff] [blame] | 127 | EXPECT_EQ_STMT(&load_arg[0], BPF_LD+BPF_W+BPF_ABS, LO_ARG(argidx)); |
| 128 | EXPECT_EQ_STMT(&load_arg[1], BPF_ST, 0); |
| 129 | EXPECT_EQ_STMT(&load_arg[2], BPF_LD+BPF_W+BPF_ABS, HI_ARG(argidx)); |
| 130 | EXPECT_EQ_STMT(&load_arg[3], BPF_ST, 1); |
Jorge Lucangeli Obes | edb1d8e | 2012-04-26 10:05:09 -0700 | [diff] [blame] | 131 | #endif |
Jorge Lucangeli Obes | fc8ab53 | 2012-03-20 10:14:31 -0700 | [diff] [blame] | 132 | } |
| 133 | |
| 134 | TEST_F(bpf, bpf_comp_jeq) { |
| 135 | struct sock_filter comp_jeq[BPF_COMP_LEN]; |
| 136 | unsigned long c = 1; |
| 137 | unsigned char jt = 1; |
| 138 | unsigned char jf = 2; |
| 139 | |
Jorge Lucangeli Obes | edb1d8e | 2012-04-26 10:05:09 -0700 | [diff] [blame] | 140 | size_t len = bpf_comp_jeq(comp_jeq, c, jt, jf); |
Jorge Lucangeli Obes | fc8ab53 | 2012-03-20 10:14:31 -0700 | [diff] [blame] | 141 | |
| 142 | EXPECT_EQ(len, BPF_COMP_LEN); |
Jorge Lucangeli Obes | edb1d8e | 2012-04-26 10:05:09 -0700 | [diff] [blame] | 143 | |
| 144 | #if defined(BITS32) |
Jorge Lucangeli Obes | ffec891 | 2012-11-30 14:46:23 -0800 | [diff] [blame] | 145 | EXPECT_EQ_BLOCK(&comp_jeq[0], |
Jorge Lucangeli Obes | edb1d8e | 2012-04-26 10:05:09 -0700 | [diff] [blame] | 146 | BPF_JMP+BPF_JEQ+BPF_K, c, jt, jf); |
| 147 | #elif defined(BITS64) |
Jorge Lucangeli Obes | fc8ab53 | 2012-03-20 10:14:31 -0700 | [diff] [blame] | 148 | EXPECT_EQ_BLOCK(&comp_jeq[0], |
| 149 | BPF_JMP+BPF_JEQ+BPF_K, 0, 0, jf + 2); |
| 150 | EXPECT_EQ_STMT(&comp_jeq[1], BPF_LD+BPF_MEM, 0); |
| 151 | EXPECT_EQ_BLOCK(&comp_jeq[2], |
| 152 | BPF_JMP+BPF_JEQ+BPF_K, c, jt, jf); |
Jorge Lucangeli Obes | edb1d8e | 2012-04-26 10:05:09 -0700 | [diff] [blame] | 153 | #endif |
Jorge Lucangeli Obes | fc8ab53 | 2012-03-20 10:14:31 -0700 | [diff] [blame] | 154 | } |
| 155 | |
Jorge Lucangeli Obes | ffec891 | 2012-11-30 14:46:23 -0800 | [diff] [blame] | 156 | TEST_F(bpf, bpf_comp_jset) { |
| 157 | struct sock_filter comp_jset[BPF_COMP_LEN]; |
| 158 | unsigned long mask = O_WRONLY; |
| 159 | unsigned char jt = 1; |
| 160 | unsigned char jf = 2; |
| 161 | |
| 162 | size_t len = bpf_comp_jset(comp_jset, mask, jt, jf); |
| 163 | |
| 164 | EXPECT_EQ(len, BPF_COMP_LEN); |
| 165 | |
| 166 | #if defined(BITS32) |
| 167 | EXPECT_EQ_BLOCK(&comp_jset[0], |
| 168 | BPF_JMP+BPF_JSET+BPF_K, mask, jt, jf); |
| 169 | #elif defined(BITS64) |
| 170 | EXPECT_EQ_BLOCK(&comp_jset[0], |
| 171 | BPF_JMP+BPF_JSET+BPF_K, 0, jt + 2, 0); |
| 172 | EXPECT_EQ_STMT(&comp_jset[1], BPF_LD+BPF_MEM, 0); |
| 173 | EXPECT_EQ_BLOCK(&comp_jset[2], |
| 174 | BPF_JMP+BPF_JSET+BPF_K, mask, jt, jf); |
| 175 | #endif |
| 176 | } |
| 177 | |
Jorge Lucangeli Obes | fc8ab53 | 2012-03-20 10:14:31 -0700 | [diff] [blame] | 178 | TEST_F(bpf, bpf_arg_comp) { |
| 179 | struct sock_filter *arg_comp; |
| 180 | int op = EQ; |
| 181 | int argidx = 1; |
| 182 | unsigned long c = 3; |
| 183 | unsigned int label_id = 0; |
| 184 | |
| 185 | size_t len = bpf_arg_comp(&arg_comp, op, argidx, c, label_id); |
| 186 | |
| 187 | EXPECT_EQ(len, BPF_ARG_COMP_LEN + 1); |
Jorge Lucangeli Obes | edb1d8e | 2012-04-26 10:05:09 -0700 | [diff] [blame] | 188 | |
| 189 | #if defined(BITS32) |
| 190 | EXPECT_EQ_STMT(&arg_comp[0], |
| 191 | BPF_LD+BPF_W+BPF_ABS, LO_ARG(argidx)); |
| 192 | EXPECT_EQ_BLOCK(&arg_comp[1], |
| 193 | BPF_JMP+BPF_JEQ+BPF_K, c, 1, 0); |
| 194 | EXPECT_JUMP_LBL(&arg_comp[2]); |
| 195 | #elif defined(BITS64) |
Jorge Lucangeli Obes | fc8ab53 | 2012-03-20 10:14:31 -0700 | [diff] [blame] | 196 | EXPECT_EQ_STMT(&arg_comp[0], |
| 197 | BPF_LD+BPF_W+BPF_ABS, LO_ARG(argidx)); |
| 198 | EXPECT_EQ_STMT(&arg_comp[1], BPF_ST, 0); |
| 199 | EXPECT_EQ_STMT(&arg_comp[2], |
| 200 | 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], |
| 204 | BPF_JMP+BPF_JEQ+BPF_K, 0, 0, 2); |
| 205 | EXPECT_EQ_STMT(&arg_comp[5], BPF_LD+BPF_MEM, 0); |
| 206 | EXPECT_EQ_BLOCK(&arg_comp[6], |
| 207 | BPF_JMP+BPF_JEQ+BPF_K, c, 1, 0); |
| 208 | EXPECT_JUMP_LBL(&arg_comp[7]); |
Jorge Lucangeli Obes | edb1d8e | 2012-04-26 10:05:09 -0700 | [diff] [blame] | 209 | #endif |
Jorge Lucangeli Obes | fc8ab53 | 2012-03-20 10:14:31 -0700 | [diff] [blame] | 210 | free(arg_comp); |
| 211 | } |
| 212 | |
Jorge Lucangeli Obes | d446726 | 2012-03-23 16:19:59 -0700 | [diff] [blame] | 213 | TEST_F(bpf, bpf_validate_arch) { |
| 214 | struct sock_filter validate_arch[ARCH_VALIDATION_LEN]; |
| 215 | |
| 216 | size_t len = bpf_validate_arch(validate_arch); |
| 217 | |
| 218 | EXPECT_EQ(len, ARCH_VALIDATION_LEN); |
| 219 | EXPECT_ARCH_VALIDATION(validate_arch); |
| 220 | } |
| 221 | |
| 222 | TEST_F(bpf, bpf_allow_syscall) { |
| 223 | struct sock_filter allow_syscall[ALLOW_SYSCALL_LEN]; |
| 224 | int nr = 1; |
| 225 | |
| 226 | size_t len = bpf_allow_syscall(allow_syscall, nr); |
| 227 | |
| 228 | EXPECT_EQ(len, ALLOW_SYSCALL_LEN); |
| 229 | EXPECT_ALLOW_SYSCALL(allow_syscall, nr); |
| 230 | } |
| 231 | |
| 232 | TEST_F(bpf, bpf_allow_syscall_args) { |
| 233 | struct sock_filter allow_syscall[ALLOW_SYSCALL_LEN]; |
| 234 | int nr = 1; |
| 235 | unsigned int id = 1024; |
| 236 | |
| 237 | size_t len = bpf_allow_syscall_args(allow_syscall, nr, id); |
| 238 | |
| 239 | EXPECT_EQ(len, ALLOW_SYSCALL_LEN); |
| 240 | EXPECT_ALLOW_SYSCALL_ARGS(allow_syscall, nr, id, JUMP_JT, JUMP_JF); |
| 241 | } |
| 242 | |
Jorge Lucangeli Obes | fc8ab53 | 2012-03-20 10:14:31 -0700 | [diff] [blame] | 243 | FIXTURE(arg_filter) { |
| 244 | struct bpf_labels labels; |
| 245 | }; |
| 246 | |
| 247 | FIXTURE_SETUP(arg_filter) {} |
| 248 | FIXTURE_TEARDOWN(arg_filter) {} |
| 249 | |
| 250 | TEST_F(arg_filter, arg0_equals) { |
| 251 | const char *fragment = "arg0 == 0"; |
| 252 | int nr = 1; |
| 253 | unsigned int id = 0; |
| 254 | struct filter_block *block = |
| 255 | compile_section(nr, fragment, id, &self->labels); |
| 256 | |
| 257 | ASSERT_NE(block, NULL); |
Jorge Lucangeli Obes | edb1d8e | 2012-04-26 10:05:09 -0700 | [diff] [blame] | 258 | size_t exp_total_len = 1 + (BPF_ARG_COMP_LEN + 1) + 2 + 1 + 2; |
| 259 | EXPECT_EQ(block->total_len, exp_total_len); |
Jorge Lucangeli Obes | fc8ab53 | 2012-03-20 10:14:31 -0700 | [diff] [blame] | 260 | |
| 261 | /* First block is a label. */ |
| 262 | struct filter_block *curr_block = block; |
| 263 | ASSERT_NE(curr_block, NULL); |
| 264 | EXPECT_EQ(block->len, 1U); |
| 265 | EXPECT_LBL(curr_block->instrs); |
| 266 | |
| 267 | /* Second block is a comparison. */ |
| 268 | curr_block = block->next; |
| 269 | EXPECT_COMP(curr_block); |
| 270 | |
| 271 | /* Third block is a jump and a label (end of AND group). */ |
| 272 | curr_block = curr_block->next; |
| 273 | EXPECT_NE(curr_block, NULL); |
| 274 | EXPECT_GROUP_END(curr_block); |
| 275 | |
| 276 | /* Fourth block is SECCOMP_RET_KILL */ |
| 277 | curr_block = curr_block->next; |
| 278 | EXPECT_NE(curr_block, NULL); |
| 279 | EXPECT_KILL(curr_block); |
| 280 | |
| 281 | /* Fifth block is "SUCCESS" label and SECCOMP_RET_ALLOW */ |
| 282 | curr_block = curr_block->next; |
| 283 | EXPECT_NE(curr_block, NULL); |
| 284 | EXPECT_ALLOW(curr_block); |
| 285 | |
| 286 | EXPECT_EQ(curr_block->next, NULL); |
| 287 | |
| 288 | free_block_list(block); |
| 289 | free_label_strings(&self->labels); |
| 290 | } |
| 291 | |
Jorge Lucangeli Obes | 66cfc14 | 2012-11-30 15:42:52 -0800 | [diff] [blame] | 292 | TEST_F(arg_filter, arg0_mask) { |
Luis Hector Chavez | 40b2574 | 2013-09-22 19:44:06 -0700 | [diff] [blame] | 293 | const char *fragment = "arg1 & O_RDWR"; |
Jorge Lucangeli Obes | 66cfc14 | 2012-11-30 15:42:52 -0800 | [diff] [blame] | 294 | int nr = 1; |
| 295 | unsigned int id = 0; |
| 296 | struct filter_block *block = |
| 297 | compile_section(nr, fragment, id, &self->labels); |
| 298 | |
| 299 | ASSERT_NE(block, NULL); |
| 300 | size_t exp_total_len = 1 + (BPF_ARG_COMP_LEN + 1) + 2 + 1 + 2; |
| 301 | EXPECT_EQ(block->total_len, exp_total_len); |
| 302 | |
| 303 | /* First block is a label. */ |
| 304 | struct filter_block *curr_block = block; |
| 305 | ASSERT_NE(curr_block, NULL); |
| 306 | EXPECT_EQ(block->len, 1U); |
| 307 | EXPECT_LBL(curr_block->instrs); |
| 308 | |
| 309 | /* Second block is a comparison. */ |
| 310 | curr_block = block->next; |
| 311 | EXPECT_COMP(curr_block); |
| 312 | |
| 313 | /* Third block is a jump and a label (end of AND group). */ |
| 314 | curr_block = curr_block->next; |
| 315 | EXPECT_NE(curr_block, NULL); |
| 316 | EXPECT_GROUP_END(curr_block); |
| 317 | |
| 318 | /* Fourth block is SECCOMP_RET_KILL */ |
| 319 | curr_block = curr_block->next; |
| 320 | EXPECT_NE(curr_block, NULL); |
| 321 | EXPECT_KILL(curr_block); |
| 322 | |
| 323 | /* Fifth block is "SUCCESS" label and SECCOMP_RET_ALLOW */ |
| 324 | curr_block = curr_block->next; |
| 325 | EXPECT_NE(curr_block, NULL); |
| 326 | EXPECT_ALLOW(curr_block); |
| 327 | |
| 328 | EXPECT_EQ(curr_block->next, NULL); |
| 329 | |
| 330 | free_block_list(block); |
| 331 | free_label_strings(&self->labels); |
| 332 | } |
| 333 | |
Luis Hector Chavez | 2122455 | 2015-06-27 18:10:39 +0000 | [diff] [blame] | 334 | TEST_F(arg_filter, arg0_eq_mask) { |
| 335 | const char *fragment = "arg1 == O_WRONLY|O_CREAT"; |
| 336 | int nr = 1; |
| 337 | unsigned int id = 0; |
| 338 | struct filter_block *block = |
| 339 | compile_section(nr, fragment, id, &self->labels); |
| 340 | |
| 341 | ASSERT_NE(block, NULL); |
| 342 | size_t exp_total_len = 1 + (BPF_ARG_COMP_LEN + 1) + 2 + 1 + 2; |
| 343 | EXPECT_EQ(block->total_len, exp_total_len); |
| 344 | |
| 345 | /* First block is a label. */ |
| 346 | struct filter_block *curr_block = block; |
| 347 | ASSERT_NE(curr_block, NULL); |
| 348 | EXPECT_EQ(block->len, 1U); |
| 349 | EXPECT_LBL(curr_block->instrs); |
| 350 | |
| 351 | /* Second block is a comparison. */ |
| 352 | curr_block = block->next; |
| 353 | EXPECT_COMP(curr_block); |
| 354 | EXPECT_EQ(curr_block->instrs[BPF_ARG_COMP_LEN - 1].k, |
| 355 | (unsigned int)(O_WRONLY | O_CREAT)); |
| 356 | |
| 357 | /* Third block is a jump and a label (end of AND group). */ |
| 358 | curr_block = curr_block->next; |
| 359 | EXPECT_NE(curr_block, NULL); |
| 360 | EXPECT_GROUP_END(curr_block); |
| 361 | |
| 362 | /* Fourth block is SECCOMP_RET_KILL */ |
| 363 | curr_block = curr_block->next; |
| 364 | EXPECT_NE(curr_block, NULL); |
| 365 | EXPECT_KILL(curr_block); |
| 366 | |
| 367 | /* Fifth block is "SUCCESS" label and SECCOMP_RET_ALLOW */ |
| 368 | curr_block = curr_block->next; |
| 369 | EXPECT_NE(curr_block, NULL); |
| 370 | EXPECT_ALLOW(curr_block); |
| 371 | |
| 372 | EXPECT_EQ(curr_block->next, NULL); |
| 373 | |
| 374 | free_block_list(block); |
| 375 | free_label_strings(&self->labels); |
| 376 | } |
| 377 | |
Jorge Lucangeli Obes | fc8ab53 | 2012-03-20 10:14:31 -0700 | [diff] [blame] | 378 | TEST_F(arg_filter, and_or) { |
| 379 | const char *fragment = "arg0 == 0 && arg1 == 0 || arg0 == 1"; |
| 380 | int nr = 1; |
| 381 | unsigned int id = 0; |
| 382 | |
| 383 | struct filter_block *block = |
| 384 | compile_section(nr, fragment, id, &self->labels); |
| 385 | ASSERT_NE(block, NULL); |
Jorge Lucangeli Obes | edb1d8e | 2012-04-26 10:05:09 -0700 | [diff] [blame] | 386 | size_t exp_total_len = 1 + 3 * (BPF_ARG_COMP_LEN + 1) + 2 + 2 + 1 + 2; |
| 387 | EXPECT_EQ(block->total_len, exp_total_len); |
Jorge Lucangeli Obes | fc8ab53 | 2012-03-20 10:14:31 -0700 | [diff] [blame] | 388 | |
| 389 | /* First block is a label. */ |
| 390 | struct filter_block *curr_block = block; |
| 391 | ASSERT_NE(curr_block, NULL); |
| 392 | EXPECT_EQ(block->len, 1U); |
| 393 | EXPECT_LBL(curr_block->instrs); |
| 394 | |
| 395 | /* Second block is a comparison ("arg0 == 0"). */ |
| 396 | curr_block = curr_block->next; |
| 397 | EXPECT_NE(curr_block, NULL); |
| 398 | EXPECT_COMP(curr_block); |
| 399 | |
| 400 | /* Third block is a comparison ("arg1 == 0"). */ |
| 401 | curr_block = curr_block->next; |
| 402 | EXPECT_NE(curr_block, NULL); |
| 403 | EXPECT_COMP(curr_block); |
| 404 | |
| 405 | /* Fourth block is a jump and a label (end of AND group). */ |
| 406 | curr_block = curr_block->next; |
| 407 | EXPECT_NE(curr_block, NULL); |
| 408 | EXPECT_GROUP_END(curr_block); |
| 409 | |
| 410 | /* Fifth block is a comparison ("arg0 == 1"). */ |
| 411 | curr_block = curr_block->next; |
| 412 | EXPECT_NE(curr_block, NULL); |
| 413 | EXPECT_COMP(curr_block); |
| 414 | |
| 415 | /* Sixth block is a jump and a label (end of AND group). */ |
| 416 | curr_block = curr_block->next; |
| 417 | EXPECT_NE(curr_block, NULL); |
| 418 | EXPECT_GROUP_END(curr_block); |
| 419 | |
| 420 | /* Seventh block is SECCOMP_RET_KILL */ |
| 421 | curr_block = curr_block->next; |
| 422 | EXPECT_NE(curr_block, NULL); |
| 423 | EXPECT_KILL(curr_block); |
| 424 | |
| 425 | /* Eigth block is "SUCCESS" label and SECCOMP_RET_ALLOW */ |
| 426 | curr_block = curr_block->next; |
| 427 | EXPECT_NE(curr_block, NULL); |
| 428 | EXPECT_ALLOW(curr_block); |
| 429 | |
| 430 | EXPECT_EQ(curr_block->next, NULL); |
| 431 | |
| 432 | free_block_list(block); |
| 433 | free_label_strings(&self->labels); |
| 434 | } |
| 435 | |
| 436 | TEST_F(arg_filter, ret_errno) { |
| 437 | const char *fragment = "arg0 == 0 || arg0 == 1; return 1"; |
| 438 | int nr = 1; |
| 439 | unsigned int id = 0; |
| 440 | |
| 441 | struct filter_block *block = |
| 442 | compile_section(nr, fragment, id, &self->labels); |
| 443 | ASSERT_NE(block, NULL); |
Jorge Lucangeli Obes | edb1d8e | 2012-04-26 10:05:09 -0700 | [diff] [blame] | 444 | size_t exp_total_len = 1 + 2 * (BPF_ARG_COMP_LEN + 1) + 2 + 2 + 1 + 2; |
| 445 | EXPECT_EQ(block->total_len, exp_total_len); |
Jorge Lucangeli Obes | fc8ab53 | 2012-03-20 10:14:31 -0700 | [diff] [blame] | 446 | |
| 447 | /* First block is a label. */ |
| 448 | struct filter_block *curr_block = block; |
| 449 | ASSERT_NE(curr_block, NULL); |
| 450 | EXPECT_EQ(block->len, 1U); |
| 451 | EXPECT_LBL(curr_block->instrs); |
| 452 | |
| 453 | /* Second block is a comparison ("arg0 == 0"). */ |
| 454 | curr_block = curr_block->next; |
| 455 | EXPECT_NE(curr_block, NULL); |
| 456 | EXPECT_COMP(curr_block); |
| 457 | |
| 458 | /* Third block is a jump and a label (end of AND group). */ |
| 459 | curr_block = curr_block->next; |
| 460 | EXPECT_NE(curr_block, NULL); |
| 461 | EXPECT_GROUP_END(curr_block); |
| 462 | |
| 463 | /* Fourth block is a comparison ("arg0 == 1"). */ |
| 464 | curr_block = curr_block->next; |
| 465 | EXPECT_NE(curr_block, NULL); |
| 466 | EXPECT_COMP(curr_block); |
| 467 | |
| 468 | /* Fifth block is a jump and a label (end of AND group). */ |
| 469 | curr_block = curr_block->next; |
| 470 | EXPECT_NE(curr_block, NULL); |
| 471 | EXPECT_GROUP_END(curr_block); |
| 472 | |
| 473 | /* Sixth block is SECCOMP_RET_ERRNO */ |
| 474 | curr_block = curr_block->next; |
| 475 | EXPECT_NE(curr_block, NULL); |
| 476 | EXPECT_EQ(curr_block->len, 1U); |
| 477 | EXPECT_EQ_STMT(curr_block->instrs, |
| 478 | BPF_RET+BPF_K, |
| 479 | SECCOMP_RET_ERRNO | (1 & SECCOMP_RET_DATA)); |
| 480 | |
| 481 | /* Seventh block is "SUCCESS" label and SECCOMP_RET_ALLOW */ |
| 482 | curr_block = curr_block->next; |
| 483 | EXPECT_NE(curr_block, NULL); |
| 484 | EXPECT_ALLOW(curr_block); |
| 485 | |
| 486 | EXPECT_EQ(curr_block->next, NULL); |
| 487 | |
| 488 | free_block_list(block); |
| 489 | free_label_strings(&self->labels); |
| 490 | } |
| 491 | |
Jorge Lucangeli Obes | d96baf4 | 2013-03-26 15:11:30 -0700 | [diff] [blame] | 492 | TEST_F(arg_filter, unconditional_errno) { |
| 493 | const char *fragment = "return 1"; |
| 494 | int nr = 1; |
| 495 | unsigned int id = 0; |
| 496 | |
| 497 | struct filter_block *block = |
| 498 | compile_section(nr, fragment, id, &self->labels); |
| 499 | ASSERT_NE(block, NULL); |
| 500 | size_t exp_total_len = 2; |
| 501 | EXPECT_EQ(block->total_len, exp_total_len); |
| 502 | |
| 503 | /* First block is a label. */ |
| 504 | struct filter_block *curr_block = block; |
| 505 | ASSERT_NE(curr_block, NULL); |
| 506 | EXPECT_EQ(block->len, 1U); |
| 507 | EXPECT_LBL(curr_block->instrs); |
| 508 | |
| 509 | /* Second block is SECCOMP_RET_ERRNO */ |
| 510 | curr_block = curr_block->next; |
| 511 | EXPECT_NE(curr_block, NULL); |
| 512 | EXPECT_EQ(curr_block->len, 1U); |
| 513 | EXPECT_EQ_STMT(curr_block->instrs, |
| 514 | BPF_RET+BPF_K, |
| 515 | SECCOMP_RET_ERRNO | (1 & SECCOMP_RET_DATA)); |
| 516 | |
| 517 | EXPECT_EQ(curr_block->next, NULL); |
| 518 | |
| 519 | free_block_list(block); |
| 520 | free_label_strings(&self->labels); |
| 521 | } |
| 522 | |
Jorge Lucangeli Obes | fc8ab53 | 2012-03-20 10:14:31 -0700 | [diff] [blame] | 523 | TEST_F(arg_filter, invalid) { |
| 524 | const char *fragment = "argnn == 0"; |
| 525 | int nr = 1; |
| 526 | unsigned int id = 0; |
| 527 | |
| 528 | struct filter_block *block = |
| 529 | compile_section(nr, fragment, id, &self->labels); |
| 530 | ASSERT_EQ(block, NULL); |
| 531 | |
| 532 | fragment = "arg0 == 0 && arg1 == 1; return errno"; |
| 533 | block = compile_section(nr, fragment, id, &self->labels); |
| 534 | ASSERT_EQ(block, NULL); |
| 535 | } |
| 536 | |
Jorge Lucangeli Obes | d446726 | 2012-03-23 16:19:59 -0700 | [diff] [blame] | 537 | FIXTURE(filter) {}; |
| 538 | |
Jorge Lucangeli Obes | 53495fe | 2015-12-01 11:56:04 -0800 | [diff] [blame] | 539 | /* |
| 540 | * When compiling for Android, disable tests that require data files. |
| 541 | * TODO(b/259497279): Re-enable this. |
| 542 | */ |
| 543 | #if !defined(__ANDROID__) |
Jorge Lucangeli Obes | d446726 | 2012-03-23 16:19:59 -0700 | [diff] [blame] | 544 | FIXTURE_SETUP(filter) {} |
| 545 | FIXTURE_TEARDOWN(filter) {} |
| 546 | |
| 547 | TEST_F(filter, seccomp_mode1) { |
| 548 | struct sock_fprog actual; |
| 549 | FILE *policy = fopen("test/seccomp.policy", "r"); |
Jorge Lucangeli Obes | bda833c | 2012-07-31 16:25:56 -0700 | [diff] [blame] | 550 | int res = compile_filter(policy, &actual, NO_LOGGING); |
Jorge Lucangeli Obes | d446726 | 2012-03-23 16:19:59 -0700 | [diff] [blame] | 551 | |
| 552 | /* |
| 553 | * Checks return value, filter length, and that the filter |
| 554 | * validates arch, loads syscall number, and |
| 555 | * only allows expected syscalls. |
| 556 | */ |
| 557 | ASSERT_EQ(res, 0); |
| 558 | EXPECT_EQ(actual.len, 13); |
| 559 | EXPECT_ARCH_VALIDATION(actual.filter); |
| 560 | EXPECT_EQ_STMT(actual.filter + ARCH_VALIDATION_LEN, |
| 561 | BPF_LD+BPF_W+BPF_ABS, syscall_nr); |
| 562 | EXPECT_ALLOW_SYSCALL(actual.filter + ARCH_VALIDATION_LEN + 1, |
| 563 | __NR_read); |
| 564 | EXPECT_ALLOW_SYSCALL(actual.filter + ARCH_VALIDATION_LEN + 3, |
| 565 | __NR_write); |
| 566 | EXPECT_ALLOW_SYSCALL(actual.filter + ARCH_VALIDATION_LEN + 5, |
| 567 | __NR_rt_sigreturn); |
| 568 | EXPECT_ALLOW_SYSCALL(actual.filter + ARCH_VALIDATION_LEN + 7, |
| 569 | __NR_exit); |
Jorge Lucangeli Obes | 18d1eba | 2014-04-18 13:58:20 -0700 | [diff] [blame] | 570 | EXPECT_EQ_STMT(actual.filter + ARCH_VALIDATION_LEN + 9, BPF_RET+BPF_K, |
| 571 | SECCOMP_RET_KILL); |
Jorge Lucangeli Obes | d446726 | 2012-03-23 16:19:59 -0700 | [diff] [blame] | 572 | |
| 573 | free(actual.filter); |
| 574 | fclose(policy); |
| 575 | } |
| 576 | |
| 577 | TEST_F(filter, seccomp_read_write) { |
| 578 | struct sock_fprog actual; |
| 579 | FILE *policy = fopen("test/stdin_stdout.policy", "r"); |
Jorge Lucangeli Obes | bda833c | 2012-07-31 16:25:56 -0700 | [diff] [blame] | 580 | int res = compile_filter(policy, &actual, NO_LOGGING); |
Jorge Lucangeli Obes | d446726 | 2012-03-23 16:19:59 -0700 | [diff] [blame] | 581 | |
| 582 | /* |
| 583 | * Checks return value, filter length, and that the filter |
| 584 | * validates arch, loads syscall number, and |
| 585 | * only allows expected syscalls, jumping to correct arg filter |
| 586 | * offsets. |
| 587 | */ |
| 588 | ASSERT_EQ(res, 0); |
| 589 | size_t exp_total_len = 27 + 3 * (BPF_ARG_COMP_LEN + 1); |
| 590 | EXPECT_EQ(actual.len, exp_total_len); |
| 591 | |
| 592 | EXPECT_ARCH_VALIDATION(actual.filter); |
| 593 | EXPECT_EQ_STMT(actual.filter + ARCH_VALIDATION_LEN, |
| 594 | BPF_LD+BPF_W+BPF_ABS, syscall_nr); |
| 595 | EXPECT_ALLOW_SYSCALL_ARGS(actual.filter + ARCH_VALIDATION_LEN + 1, |
| 596 | __NR_read, 7, 0, 0); |
| 597 | EXPECT_ALLOW_SYSCALL_ARGS(actual.filter + ARCH_VALIDATION_LEN + 3, |
| 598 | __NR_write, 12 + BPF_ARG_COMP_LEN, 0, 0); |
| 599 | EXPECT_ALLOW_SYSCALL(actual.filter + ARCH_VALIDATION_LEN + 5, |
| 600 | __NR_rt_sigreturn); |
| 601 | EXPECT_ALLOW_SYSCALL(actual.filter + ARCH_VALIDATION_LEN + 7, |
| 602 | __NR_exit); |
Jorge Lucangeli Obes | 18d1eba | 2014-04-18 13:58:20 -0700 | [diff] [blame] | 603 | EXPECT_EQ_STMT(actual.filter + ARCH_VALIDATION_LEN + 9, BPF_RET+BPF_K, |
| 604 | SECCOMP_RET_KILL); |
Jorge Lucangeli Obes | d446726 | 2012-03-23 16:19:59 -0700 | [diff] [blame] | 605 | |
| 606 | free(actual.filter); |
| 607 | fclose(policy); |
| 608 | } |
| 609 | |
| 610 | TEST_F(filter, invalid) { |
| 611 | struct sock_fprog actual; |
| 612 | |
| 613 | FILE *policy = fopen("test/invalid_syscall_name.policy", "r"); |
Jorge Lucangeli Obes | bda833c | 2012-07-31 16:25:56 -0700 | [diff] [blame] | 614 | int res = compile_filter(policy, &actual, NO_LOGGING); |
Jorge Lucangeli Obes | d446726 | 2012-03-23 16:19:59 -0700 | [diff] [blame] | 615 | ASSERT_NE(res, 0); |
| 616 | fclose(policy); |
| 617 | |
| 618 | policy = fopen("test/invalid_arg_filter.policy", "r"); |
Jorge Lucangeli Obes | bda833c | 2012-07-31 16:25:56 -0700 | [diff] [blame] | 619 | res = compile_filter(policy, &actual, NO_LOGGING); |
Jorge Lucangeli Obes | d446726 | 2012-03-23 16:19:59 -0700 | [diff] [blame] | 620 | ASSERT_NE(res, 0); |
| 621 | fclose(policy); |
| 622 | } |
| 623 | |
Jorge Lucangeli Obes | 6135db9 | 2012-07-27 13:37:30 -0700 | [diff] [blame] | 624 | TEST_F(filter, nonexistent) { |
| 625 | struct sock_fprog actual; |
| 626 | |
| 627 | FILE *policy = fopen("test/nonexistent-file.policy", "r"); |
Jorge Lucangeli Obes | bda833c | 2012-07-31 16:25:56 -0700 | [diff] [blame] | 628 | int res = compile_filter(policy, &actual, NO_LOGGING); |
Jorge Lucangeli Obes | 6135db9 | 2012-07-27 13:37:30 -0700 | [diff] [blame] | 629 | ASSERT_NE(res, 0); |
| 630 | } |
| 631 | |
Jorge Lucangeli Obes | bda833c | 2012-07-31 16:25:56 -0700 | [diff] [blame] | 632 | TEST_F(filter, log) { |
| 633 | struct sock_fprog actual; |
| 634 | |
| 635 | FILE *policy = fopen("test/seccomp.policy", "r"); |
| 636 | int res = compile_filter(policy, &actual, USE_LOGGING); |
| 637 | |
| 638 | size_t i; |
| 639 | size_t index = 0; |
| 640 | /* |
| 641 | * Checks return value, filter length, and that the filter |
| 642 | * validates arch, loads syscall number, only allows expected syscalls, |
| 643 | * and returns TRAP on failure. |
| 644 | * NOTE(jorgelo): the filter is longer since we add the syscalls needed |
| 645 | * for logging. |
| 646 | */ |
| 647 | ASSERT_EQ(res, 0); |
| 648 | EXPECT_EQ(actual.len, 13 + 2 * log_syscalls_len); |
| 649 | EXPECT_ARCH_VALIDATION(actual.filter); |
| 650 | EXPECT_EQ_STMT(actual.filter + ARCH_VALIDATION_LEN, |
| 651 | BPF_LD+BPF_W+BPF_ABS, syscall_nr); |
| 652 | |
| 653 | index = ARCH_VALIDATION_LEN + 1; |
| 654 | for (i = 0; i < log_syscalls_len; i++) |
| 655 | EXPECT_ALLOW_SYSCALL(actual.filter + (index + 2 * i), |
| 656 | lookup_syscall(log_syscalls[i])); |
| 657 | |
| 658 | index += 2 * log_syscalls_len; |
| 659 | |
| 660 | EXPECT_ALLOW_SYSCALL(actual.filter + index, __NR_read); |
| 661 | EXPECT_ALLOW_SYSCALL(actual.filter + index + 2, __NR_write); |
| 662 | EXPECT_ALLOW_SYSCALL(actual.filter + index + 4, __NR_rt_sigreturn); |
| 663 | EXPECT_ALLOW_SYSCALL(actual.filter + index + 6, __NR_exit); |
Jorge Lucangeli Obes | 66cfc14 | 2012-11-30 15:42:52 -0800 | [diff] [blame] | 664 | EXPECT_EQ_STMT(actual.filter + index + 8, BPF_RET+BPF_K, |
| 665 | SECCOMP_RET_TRAP); |
Jorge Lucangeli Obes | bda833c | 2012-07-31 16:25:56 -0700 | [diff] [blame] | 666 | |
| 667 | free(actual.filter); |
| 668 | fclose(policy); |
| 669 | } |
Jorge Lucangeli Obes | 53495fe | 2015-12-01 11:56:04 -0800 | [diff] [blame] | 670 | #endif /* __ANDROID__ */ |
Jorge Lucangeli Obes | ffec891 | 2012-11-30 14:46:23 -0800 | [diff] [blame] | 671 | |
| 672 | TEST_HARNESS_MAIN |