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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 | // SPDX-License-Identifier: GPL-2.0 /* Converted from tools/testing/selftests/bpf/verifier/stack_ptr.c */ #include <linux/bpf.h> #include <bpf/bpf_helpers.h> #include <limits.h> #include "bpf_misc.h" #define MAX_ENTRIES 11 struct test_val { unsigned int index; int foo[MAX_ENTRIES]; }; struct { __uint(type, BPF_MAP_TYPE_ARRAY); __uint(max_entries, 1); __type(key, int); __type(value, struct test_val); } map_array_48b SEC(".maps"); SEC("socket") __description("PTR_TO_STACK store/load") __success __success_unpriv __retval(0xfaceb00c) __naked void ptr_to_stack_store_load(void) { asm volatile (" \ r1 = r10; \ r1 += -10; \ r0 = 0xfaceb00c; \ *(u64*)(r1 + 2) = r0; \ r0 = *(u64*)(r1 + 2); \ exit; \ " ::: __clobber_all); } SEC("socket") __description("PTR_TO_STACK store/load - bad alignment on off") __failure __msg("misaligned stack access off 0+-8+2 size 8") __failure_unpriv __naked void load_bad_alignment_on_off(void) { asm volatile (" \ r1 = r10; \ r1 += -8; \ r0 = 0xfaceb00c; \ *(u64*)(r1 + 2) = r0; \ r0 = *(u64*)(r1 + 2); \ exit; \ " ::: __clobber_all); } SEC("socket") __description("PTR_TO_STACK store/load - bad alignment on reg") __failure __msg("misaligned stack access off 0+-10+8 size 8") __failure_unpriv __naked void load_bad_alignment_on_reg(void) { asm volatile (" \ r1 = r10; \ r1 += -10; \ r0 = 0xfaceb00c; \ *(u64*)(r1 + 8) = r0; \ r0 = *(u64*)(r1 + 8); \ exit; \ " ::: __clobber_all); } SEC("socket") __description("PTR_TO_STACK store/load - out of bounds low") __failure __msg("invalid write to stack R1 off=-79992 size=8") __msg_unpriv("R1 stack pointer arithmetic goes out of range") __naked void load_out_of_bounds_low(void) { asm volatile (" \ r1 = r10; \ r1 += -80000; \ r0 = 0xfaceb00c; \ *(u64*)(r1 + 8) = r0; \ r0 = *(u64*)(r1 + 8); \ exit; \ " ::: __clobber_all); } SEC("socket") __description("PTR_TO_STACK store/load - out of bounds high") __failure __msg("invalid write to stack R1 off=0 size=8") __failure_unpriv __naked void load_out_of_bounds_high(void) { asm volatile (" \ r1 = r10; \ r1 += -8; \ r0 = 0xfaceb00c; \ *(u64*)(r1 + 8) = r0; \ r0 = *(u64*)(r1 + 8); \ exit; \ " ::: __clobber_all); } SEC("socket") __description("PTR_TO_STACK check high 1") __success __success_unpriv __retval(42) __naked void to_stack_check_high_1(void) { asm volatile (" \ r1 = r10; \ r1 += -1; \ r0 = 42; \ *(u8*)(r1 + 0) = r0; \ r0 = *(u8*)(r1 + 0); \ exit; \ " ::: __clobber_all); } SEC("socket") __description("PTR_TO_STACK check high 2") __success __success_unpriv __retval(42) __naked void to_stack_check_high_2(void) { asm volatile (" \ r1 = r10; \ r0 = 42; \ *(u8*)(r1 - 1) = r0; \ r0 = *(u8*)(r1 - 1); \ exit; \ " ::: __clobber_all); } SEC("socket") __description("PTR_TO_STACK check high 3") __success __failure_unpriv __msg_unpriv("R1 stack pointer arithmetic goes out of range") __retval(42) __naked void to_stack_check_high_3(void) { asm volatile (" \ r1 = r10; \ r1 += 0; \ r0 = 42; \ *(u8*)(r1 - 1) = r0; \ r0 = *(u8*)(r1 - 1); \ exit; \ " ::: __clobber_all); } SEC("socket") __description("PTR_TO_STACK check high 4") __failure __msg("invalid write to stack R1 off=0 size=1") __msg_unpriv("R1 stack pointer arithmetic goes out of range") __naked void to_stack_check_high_4(void) { asm volatile (" \ r1 = r10; \ r1 += 0; \ r0 = 42; \ *(u8*)(r1 + 0) = r0; \ r0 = *(u8*)(r1 + 0); \ exit; \ " ::: __clobber_all); } SEC("socket") __description("PTR_TO_STACK check high 5") __failure __msg("invalid write to stack R1") __msg_unpriv("R1 stack pointer arithmetic goes out of range") __naked void to_stack_check_high_5(void) { asm volatile (" \ r1 = r10; \ r1 += %[__imm_0]; \ r0 = 42; \ *(u8*)(r1 + 0) = r0; \ r0 = *(u8*)(r1 + 0); \ exit; \ " : : __imm_const(__imm_0, (1 << 29) - 1) : __clobber_all); } SEC("socket") __description("PTR_TO_STACK check high 6") __failure __msg("invalid write to stack") __msg_unpriv("R1 stack pointer arithmetic goes out of range") __naked void to_stack_check_high_6(void) { asm volatile (" \ r1 = r10; \ r1 += %[__imm_0]; \ r0 = 42; \ *(u8*)(r1 + %[shrt_max]) = r0; \ r0 = *(u8*)(r1 + %[shrt_max]); \ exit; \ " : : __imm_const(__imm_0, (1 << 29) - 1), __imm_const(shrt_max, SHRT_MAX) : __clobber_all); } SEC("socket") __description("PTR_TO_STACK check high 7") __failure __msg("fp pointer offset") __msg_unpriv("R1 stack pointer arithmetic goes out of range") __naked void to_stack_check_high_7(void) { asm volatile (" \ r1 = r10; \ r1 += %[__imm_0]; \ r1 += %[__imm_0]; \ r0 = 42; \ *(u8*)(r1 + %[shrt_max]) = r0; \ r0 = *(u8*)(r1 + %[shrt_max]); \ exit; \ " : : __imm_const(__imm_0, (1 << 29) - 1), __imm_const(shrt_max, SHRT_MAX) : __clobber_all); } SEC("socket") __description("PTR_TO_STACK check low 1") __success __success_unpriv __retval(42) __naked void to_stack_check_low_1(void) { asm volatile (" \ r1 = r10; \ r1 += -512; \ r0 = 42; \ *(u8*)(r1 + 0) = r0; \ r0 = *(u8*)(r1 + 0); \ exit; \ " ::: __clobber_all); } SEC("socket") __description("PTR_TO_STACK check low 2") __success __failure_unpriv __msg_unpriv("R1 stack pointer arithmetic goes out of range") __retval(42) __naked void to_stack_check_low_2(void) { asm volatile (" \ r1 = r10; \ r1 += -513; \ r0 = 42; \ *(u8*)(r1 + 1) = r0; \ r0 = *(u8*)(r1 + 1); \ exit; \ " ::: __clobber_all); } SEC("socket") __description("PTR_TO_STACK check low 3") __failure __msg("invalid write to stack R1 off=-513 size=1") __msg_unpriv("R1 stack pointer arithmetic goes out of range") __naked void to_stack_check_low_3(void) { asm volatile (" \ r1 = r10; \ r1 += -513; \ r0 = 42; \ *(u8*)(r1 + 0) = r0; \ r0 = *(u8*)(r1 + 0); \ exit; \ " ::: __clobber_all); } SEC("socket") __description("PTR_TO_STACK check low 4") __failure __msg("math between fp pointer") __failure_unpriv __naked void to_stack_check_low_4(void) { asm volatile (" \ r1 = r10; \ r1 += %[int_min]; \ r0 = 42; \ *(u8*)(r1 + 0) = r0; \ r0 = *(u8*)(r1 + 0); \ exit; \ " : : __imm_const(int_min, INT_MIN) : __clobber_all); } SEC("socket") __description("PTR_TO_STACK check low 5") __failure __msg("invalid write to stack") __msg_unpriv("R1 stack pointer arithmetic goes out of range") __naked void to_stack_check_low_5(void) { asm volatile (" \ r1 = r10; \ r1 += %[__imm_0]; \ r0 = 42; \ *(u8*)(r1 + 0) = r0; \ r0 = *(u8*)(r1 + 0); \ exit; \ " : : __imm_const(__imm_0, -((1 << 29) - 1)) : __clobber_all); } SEC("socket") __description("PTR_TO_STACK check low 6") __failure __msg("invalid write to stack") __msg_unpriv("R1 stack pointer arithmetic goes out of range") __naked void to_stack_check_low_6(void) { asm volatile (" \ r1 = r10; \ r1 += %[__imm_0]; \ r0 = 42; \ *(u8*)(r1 %[shrt_min]) = r0; \ r0 = *(u8*)(r1 %[shrt_min]); \ exit; \ " : : __imm_const(__imm_0, -((1 << 29) - 1)), __imm_const(shrt_min, SHRT_MIN) : __clobber_all); } SEC("socket") __description("PTR_TO_STACK check low 7") __failure __msg("fp pointer offset") __msg_unpriv("R1 stack pointer arithmetic goes out of range") __naked void to_stack_check_low_7(void) { asm volatile (" \ r1 = r10; \ r1 += %[__imm_0]; \ r1 += %[__imm_0]; \ r0 = 42; \ *(u8*)(r1 %[shrt_min]) = r0; \ r0 = *(u8*)(r1 %[shrt_min]); \ exit; \ " : : __imm_const(__imm_0, -((1 << 29) - 1)), __imm_const(shrt_min, SHRT_MIN) : __clobber_all); } SEC("socket") __description("PTR_TO_STACK mixed reg/k, 1") __success __success_unpriv __retval(42) __naked void stack_mixed_reg_k_1(void) { asm volatile (" \ r1 = r10; \ r1 += -3; \ r2 = -3; \ r1 += r2; \ r0 = 42; \ *(u8*)(r1 + 0) = r0; \ r0 = *(u8*)(r1 + 0); \ exit; \ " ::: __clobber_all); } SEC("socket") __description("PTR_TO_STACK mixed reg/k, 2") __success __success_unpriv __retval(42) __naked void stack_mixed_reg_k_2(void) { asm volatile (" \ r0 = 0; \ *(u64*)(r10 - 8) = r0; \ r0 = 0; \ *(u64*)(r10 - 16) = r0; \ r1 = r10; \ r1 += -3; \ r2 = -3; \ r1 += r2; \ r0 = 42; \ *(u8*)(r1 + 0) = r0; \ r5 = r10; \ r0 = *(u8*)(r5 - 6); \ exit; \ " ::: __clobber_all); } SEC("socket") __description("PTR_TO_STACK mixed reg/k, 3") __success __success_unpriv __retval(-3) __naked void stack_mixed_reg_k_3(void) { asm volatile (" \ r1 = r10; \ r1 += -3; \ r2 = -3; \ r1 += r2; \ r0 = 42; \ *(u8*)(r1 + 0) = r0; \ r0 = r2; \ exit; \ " ::: __clobber_all); } SEC("socket") __description("PTR_TO_STACK reg") __success __success_unpriv __retval(42) __naked void ptr_to_stack_reg(void) { asm volatile (" \ r1 = r10; \ r2 = -3; \ r1 += r2; \ r0 = 42; \ *(u8*)(r1 + 0) = r0; \ r0 = *(u8*)(r1 + 0); \ exit; \ " ::: __clobber_all); } SEC("socket") __description("stack pointer arithmetic") __success __success_unpriv __retval(0) __naked void stack_pointer_arithmetic(void) { asm volatile (" \ r1 = 4; \ goto l0_%=; \ l0_%=: r7 = r10; \ r7 += -10; \ r7 += -10; \ r2 = r7; \ r2 += r1; \ r0 = 0; \ *(u32*)(r2 + 4) = r0; \ r2 = r7; \ r2 += 8; \ r0 = 0; \ *(u32*)(r2 + 4) = r0; \ r0 = 0; \ exit; \ " ::: __clobber_all); } SEC("tc") __description("store PTR_TO_STACK in R10 to array map using BPF_B") __success __retval(42) __naked void array_map_using_bpf_b(void) { asm volatile (" \ /* Load pointer to map. */ \ r2 = r10; \ r2 += -8; \ r1 = 0; \ *(u64*)(r2 + 0) = r1; \ r1 = %[map_array_48b] ll; \ call %[bpf_map_lookup_elem]; \ if r0 != 0 goto l0_%=; \ r0 = 2; \ exit; \ l0_%=: r1 = r0; \ /* Copy R10 to R9. */ \ r9 = r10; \ /* Pollute other registers with unaligned values. */\ r2 = -1; \ r3 = -1; \ r4 = -1; \ r5 = -1; \ r6 = -1; \ r7 = -1; \ r8 = -1; \ /* Store both R9 and R10 with BPF_B and read back. */\ *(u8*)(r1 + 0) = r10; \ r2 = *(u8*)(r1 + 0); \ *(u8*)(r1 + 0) = r9; \ r3 = *(u8*)(r1 + 0); \ /* Should read back as same value. */ \ if r2 == r3 goto l1_%=; \ r0 = 1; \ exit; \ l1_%=: r0 = 42; \ exit; \ " : : __imm(bpf_map_lookup_elem), __imm_addr(map_array_48b) : __clobber_all); } char _license[] SEC("license") = "GPL"; |