string.c revision cdc3a89d5de90b2299c56f4a46c3de590c5184d1
1// RUN: %clang_cc1 -analyze -analyzer-checker=core,unix.cstring,alpha.unix.cstring,debug.ExprInspection -analyzer-store=region -Wno-null-dereference -verify %s 2// RUN: %clang_cc1 -analyze -DUSE_BUILTINS -analyzer-checker=core,unix.cstring,alpha.unix.cstring,debug.ExprInspection -analyzer-store=region -Wno-null-dereference -verify %s 3// RUN: %clang_cc1 -analyze -DVARIANT -analyzer-checker=core,unix.cstring,alpha.unix.cstring,debug.ExprInspection -analyzer-store=region -Wno-null-dereference -verify %s 4// RUN: %clang_cc1 -analyze -DUSE_BUILTINS -DVARIANT -analyzer-checker=alpha.security.taint,core,unix.cstring,alpha.unix.cstring,debug.ExprInspection -analyzer-store=region -Wno-null-dereference -verify %s 5 6//===----------------------------------------------------------------------=== 7// Declarations 8//===----------------------------------------------------------------------=== 9 10// Some functions are so similar to each other that they follow the same code 11// path, such as memcpy and __memcpy_chk, or memcmp and bcmp. If VARIANT is 12// defined, make sure to use the variants instead to make sure they are still 13// checked by the analyzer. 14 15// Some functions are implemented as builtins. These should be #defined as 16// BUILTIN(f), which will prepend "__builtin_" if USE_BUILTINS is defined. 17 18// Functions that have variants and are also available as builtins should be 19// declared carefully! See memcpy() for an example. 20 21#ifdef USE_BUILTINS 22# define BUILTIN(f) __builtin_ ## f 23#else /* USE_BUILTINS */ 24# define BUILTIN(f) f 25#endif /* USE_BUILTINS */ 26 27#define NULL 0 28typedef typeof(sizeof(int)) size_t; 29 30void clang_analyzer_eval(int); 31 32int scanf(const char *restrict format, ...); 33 34//===----------------------------------------------------------------------=== 35// strlen() 36//===----------------------------------------------------------------------=== 37 38#define strlen BUILTIN(strlen) 39size_t strlen(const char *s); 40 41void strlen_constant0() { 42 clang_analyzer_eval(strlen("123") == 3); // expected-warning{{TRUE}} 43} 44 45void strlen_constant1() { 46 const char *a = "123"; 47 clang_analyzer_eval(strlen(a) == 3); // expected-warning{{TRUE}} 48} 49 50void strlen_constant2(char x) { 51 char a[] = "123"; 52 clang_analyzer_eval(strlen(a) == 3); // expected-warning{{TRUE}} 53 54 a[0] = x; 55 clang_analyzer_eval(strlen(a) == 3); // expected-warning{{UNKNOWN}} 56} 57 58size_t strlen_null() { 59 return strlen(0); // expected-warning{{Null pointer argument in call to string length function}} 60} 61 62size_t strlen_fn() { 63 return strlen((char*)&strlen_fn); // expected-warning{{Argument to string length function is the address of the function 'strlen_fn', which is not a null-terminated string}} 64} 65 66size_t strlen_nonloc() { 67label: 68 return strlen((char*)&&label); // expected-warning{{Argument to string length function is the address of the label 'label', which is not a null-terminated string}} 69} 70 71void strlen_subregion() { 72 struct two_strings { char a[2], b[2]; }; 73 extern void use_two_strings(struct two_strings *); 74 75 struct two_strings z; 76 use_two_strings(&z); 77 78 size_t a = strlen(z.a); 79 z.b[0] = 5; 80 size_t b = strlen(z.a); 81 if (a == 0) 82 clang_analyzer_eval(b == 0); // expected-warning{{TRUE}} 83 84 use_two_strings(&z); 85 86 size_t c = strlen(z.a); 87 if (a == 0) 88 clang_analyzer_eval(c == 0); // expected-warning{{UNKNOWN}} 89} 90 91extern void use_string(char *); 92void strlen_argument(char *x) { 93 size_t a = strlen(x); 94 size_t b = strlen(x); 95 if (a == 0) 96 clang_analyzer_eval(b == 0); // expected-warning{{TRUE}} 97 98 use_string(x); 99 100 size_t c = strlen(x); 101 if (a == 0) 102 clang_analyzer_eval(c == 0); // expected-warning{{UNKNOWN}} 103} 104 105extern char global_str[]; 106void strlen_global() { 107 size_t a = strlen(global_str); 108 size_t b = strlen(global_str); 109 if (a == 0) { 110 clang_analyzer_eval(b == 0); // expected-warning{{TRUE}} 111 // Make sure clang_analyzer_eval does not invalidate globals. 112 clang_analyzer_eval(strlen(global_str) == 0); // expected-warning{{TRUE}} 113 } 114 115 // Call a function with unknown effects, which should invalidate globals. 116 use_string(0); 117 118 size_t c = strlen(global_str); 119 if (a == 0) 120 clang_analyzer_eval(c == 0); // expected-warning{{UNKNOWN}} 121} 122 123void strlen_indirect(char *x) { 124 size_t a = strlen(x); 125 char *p = x; 126 char **p2 = &p; 127 size_t b = strlen(x); 128 if (a == 0) 129 clang_analyzer_eval(b == 0); // expected-warning{{TRUE}} 130 131 extern void use_string_ptr(char*const*); 132 use_string_ptr(p2); 133 134 size_t c = strlen(x); 135 if (a == 0) 136 clang_analyzer_eval(c == 0); // expected-warning{{UNKNOWN}} 137} 138 139void strlen_indirect2(char *x) { 140 size_t a = strlen(x); 141 char *p = x; 142 char **p2 = &p; 143 extern void use_string_ptr2(char**); 144 use_string_ptr2(p2); 145 146 size_t c = strlen(x); 147 if (a == 0) 148 clang_analyzer_eval(c == 0); // expected-warning{{UNKNOWN}} 149} 150 151void strlen_liveness(const char *x) { 152 if (strlen(x) < 5) 153 return; 154 clang_analyzer_eval(strlen(x) < 5); // expected-warning{{FALSE}} 155} 156 157//===----------------------------------------------------------------------=== 158// strnlen() 159//===----------------------------------------------------------------------=== 160 161size_t strnlen(const char *s, size_t maxlen); 162 163void strnlen_constant0() { 164 clang_analyzer_eval(strnlen("123", 10) == 3); // expected-warning{{TRUE}} 165} 166 167void strnlen_constant1() { 168 const char *a = "123"; 169 clang_analyzer_eval(strnlen(a, 10) == 3); // expected-warning{{TRUE}} 170} 171 172void strnlen_constant2(char x) { 173 char a[] = "123"; 174 clang_analyzer_eval(strnlen(a, 10) == 3); // expected-warning{{TRUE}} 175 a[0] = x; 176 clang_analyzer_eval(strnlen(a, 10) == 3); // expected-warning{{UNKNOWN}} 177} 178 179void strnlen_constant4() { 180 clang_analyzer_eval(strnlen("123456", 3) == 3); // expected-warning{{TRUE}} 181} 182 183void strnlen_constant5() { 184 const char *a = "123456"; 185 clang_analyzer_eval(strnlen(a, 3) == 3); // expected-warning{{TRUE}} 186} 187 188void strnlen_constant6(char x) { 189 char a[] = "123456"; 190 clang_analyzer_eval(strnlen(a, 3) == 3); // expected-warning{{TRUE}} 191 a[0] = x; 192 clang_analyzer_eval(strnlen(a, 3) == 3); // expected-warning{{UNKNOWN}} 193} 194 195size_t strnlen_null() { 196 return strnlen(0, 3); // expected-warning{{Null pointer argument in call to string length function}} 197} 198 199size_t strnlen_fn() { 200 return strnlen((char*)&strlen_fn, 3); // expected-warning{{Argument to string length function is the address of the function 'strlen_fn', which is not a null-terminated string}} 201} 202 203size_t strnlen_nonloc() { 204label: 205 return strnlen((char*)&&label, 3); // expected-warning{{Argument to string length function is the address of the label 'label', which is not a null-terminated string}} 206} 207 208void strnlen_zero() { 209 clang_analyzer_eval(strnlen("abc", 0) == 0); // expected-warning{{TRUE}} 210 clang_analyzer_eval(strnlen(NULL, 0) == 0); // expected-warning{{TRUE}} 211} 212 213size_t strnlen_compound_literal() { 214 // This used to crash because we don't model the string lengths of 215 // compound literals. 216 return strnlen((char[]) { 'a', 'b', 0 }, 1); 217} 218 219size_t strnlen_unknown_limit(float f) { 220 // This used to crash because we don't model the integer values of floats. 221 return strnlen("abc", (int)f); 222} 223 224void strnlen_is_not_strlen(char *x) { 225 clang_analyzer_eval(strnlen(x, 10) == strlen(x)); // expected-warning{{UNKNOWN}} 226} 227 228void strnlen_at_limit(char *x) { 229 size_t len = strnlen(x, 10); 230 clang_analyzer_eval(len <= 10); // expected-warning{{TRUE}} 231 clang_analyzer_eval(len == 10); // expected-warning{{UNKNOWN}} 232 clang_analyzer_eval(len < 10); // expected-warning{{UNKNOWN}} 233} 234 235void strnlen_at_actual(size_t limit) { 236 size_t len = strnlen("abc", limit); 237 clang_analyzer_eval(len <= 3); // expected-warning{{TRUE}} 238 // This is due to eager assertion in strnlen. 239 if (limit == 0) { 240 clang_analyzer_eval(len == 0); // expected-warning{{TRUE}} 241 } else { 242 clang_analyzer_eval(len == 3); // expected-warning{{UNKNOWN}} 243 clang_analyzer_eval(len < 3); // expected-warning{{UNKNOWN}} 244 } 245} 246 247//===----------------------------------------------------------------------=== 248// strcpy() 249//===----------------------------------------------------------------------=== 250 251#ifdef VARIANT 252 253#define __strcpy_chk BUILTIN(__strcpy_chk) 254char *__strcpy_chk(char *restrict s1, const char *restrict s2, size_t destlen); 255 256#define strcpy(a,b) __strcpy_chk(a,b,(size_t)-1) 257 258#else /* VARIANT */ 259 260#define strcpy BUILTIN(strcpy) 261char *strcpy(char *restrict s1, const char *restrict s2); 262 263#endif /* VARIANT */ 264 265 266void strcpy_null_dst(char *x) { 267 strcpy(NULL, x); // expected-warning{{Null pointer argument in call to string copy function}} 268} 269 270void strcpy_null_src(char *x) { 271 strcpy(x, NULL); // expected-warning{{Null pointer argument in call to string copy function}} 272} 273 274void strcpy_fn(char *x) { 275 strcpy(x, (char*)&strcpy_fn); // expected-warning{{Argument to string copy function is the address of the function 'strcpy_fn', which is not a null-terminated string}} 276} 277 278void strcpy_fn_const(char *x) { 279 strcpy(x, (const char*)&strcpy_fn); // expected-warning{{Argument to string copy function is the address of the function 'strcpy_fn', which is not a null-terminated string}} 280} 281 282void strcpy_effects(char *x, char *y) { 283 char a = x[0]; 284 285 clang_analyzer_eval(strcpy(x, y) == x); // expected-warning{{TRUE}} 286 clang_analyzer_eval(strlen(x) == strlen(y)); // expected-warning{{TRUE}} 287 clang_analyzer_eval(a == x[0]); // expected-warning{{UNKNOWN}} 288} 289 290void strcpy_overflow(char *y) { 291 char x[4]; 292 if (strlen(y) == 4) 293 strcpy(x, y); // expected-warning{{String copy function overflows destination buffer}} 294} 295 296void strcpy_no_overflow(char *y) { 297 char x[4]; 298 if (strlen(y) == 3) 299 strcpy(x, y); // no-warning 300} 301 302//===----------------------------------------------------------------------=== 303// stpcpy() 304//===----------------------------------------------------------------------=== 305 306#ifdef VARIANT 307 308#define __stpcpy_chk BUILTIN(__stpcpy_chk) 309char *__stpcpy_chk(char *restrict s1, const char *restrict s2, size_t destlen); 310 311#define stpcpy(a,b) __stpcpy_chk(a,b,(size_t)-1) 312 313#else /* VARIANT */ 314 315#define stpcpy BUILTIN(stpcpy) 316char *stpcpy(char *restrict s1, const char *restrict s2); 317 318#endif /* VARIANT */ 319 320 321void stpcpy_effect(char *x, char *y) { 322 char a = x[0]; 323 324 clang_analyzer_eval(stpcpy(x, y) == &x[strlen(y)]); // expected-warning{{TRUE}} 325 clang_analyzer_eval(strlen(x) == strlen(y)); // expected-warning{{TRUE}} 326 clang_analyzer_eval(a == x[0]); // expected-warning{{UNKNOWN}} 327} 328 329void stpcpy_overflow(char *y) { 330 char x[4]; 331 if (strlen(y) == 4) 332 stpcpy(x, y); // expected-warning{{String copy function overflows destination buffer}} 333} 334 335void stpcpy_no_overflow(char *y) { 336 char x[4]; 337 if (strlen(y) == 3) 338 stpcpy(x, y); // no-warning 339} 340 341//===----------------------------------------------------------------------=== 342// strcat() 343//===----------------------------------------------------------------------=== 344 345#ifdef VARIANT 346 347#define __strcat_chk BUILTIN(__strcat_chk) 348char *__strcat_chk(char *restrict s1, const char *restrict s2, size_t destlen); 349 350#define strcat(a,b) __strcat_chk(a,b,(size_t)-1) 351 352#else /* VARIANT */ 353 354#define strcat BUILTIN(strcat) 355char *strcat(char *restrict s1, const char *restrict s2); 356 357#endif /* VARIANT */ 358 359 360void strcat_null_dst(char *x) { 361 strcat(NULL, x); // expected-warning{{Null pointer argument in call to string copy function}} 362} 363 364void strcat_null_src(char *x) { 365 strcat(x, NULL); // expected-warning{{Null pointer argument in call to string copy function}} 366} 367 368void strcat_fn(char *x) { 369 strcat(x, (char*)&strcat_fn); // expected-warning{{Argument to string copy function is the address of the function 'strcat_fn', which is not a null-terminated string}} 370} 371 372void strcat_effects(char *y) { 373 char x[8] = "123"; 374 size_t orig_len = strlen(x); 375 char a = x[0]; 376 377 if (strlen(y) != 4) 378 return; 379 380 clang_analyzer_eval(strcat(x, y) == x); // expected-warning{{TRUE}} 381 clang_analyzer_eval((int)strlen(x) == (orig_len + strlen(y))); // expected-warning{{TRUE}} 382} 383 384void strcat_overflow_0(char *y) { 385 char x[4] = "12"; 386 if (strlen(y) == 4) 387 strcat(x, y); // expected-warning{{String copy function overflows destination buffer}} 388} 389 390void strcat_overflow_1(char *y) { 391 char x[4] = "12"; 392 if (strlen(y) == 3) 393 strcat(x, y); // expected-warning{{String copy function overflows destination buffer}} 394} 395 396void strcat_overflow_2(char *y) { 397 char x[4] = "12"; 398 if (strlen(y) == 2) 399 strcat(x, y); // expected-warning{{String copy function overflows destination buffer}} 400} 401 402void strcat_no_overflow(char *y) { 403 char x[5] = "12"; 404 if (strlen(y) == 2) 405 strcat(x, y); // no-warning 406} 407 408void strcat_symbolic_dst_length(char *dst) { 409 strcat(dst, "1234"); 410 clang_analyzer_eval(strlen(dst) >= 4); // expected-warning{{TRUE}} 411} 412 413void strcat_symbolic_src_length(char *src) { 414 char dst[8] = "1234"; 415 strcat(dst, src); 416 clang_analyzer_eval(strlen(dst) >= 4); // expected-warning{{TRUE}} 417} 418 419void strcat_symbolic_dst_length_taint(char *dst) { 420 scanf("%s", dst); // Taint data. 421 strcat(dst, "1234"); 422 clang_analyzer_eval(strlen(dst) >= 4); // expected-warning{{TRUE}} 423} 424 425void strcat_unknown_src_length(char *src, int offset) { 426 char dst[8] = "1234"; 427 strcat(dst, &src[offset]); 428 clang_analyzer_eval(strlen(dst) >= 4); // expected-warning{{TRUE}} 429} 430 431// There is no strcat_unknown_dst_length because if we can't get a symbolic 432// length for the "before" strlen, we won't be able to set one for "after". 433 434void strcat_too_big(char *dst, char *src) { 435 if (strlen(dst) != (((size_t)0) - 2)) 436 return; 437 if (strlen(src) != 2) 438 return; 439 strcat(dst, src); // expected-warning{{This expression will create a string whose length is too big to be represented as a size_t}} 440} 441 442 443//===----------------------------------------------------------------------=== 444// strncpy() 445//===----------------------------------------------------------------------=== 446 447#ifdef VARIANT 448 449#define __strncpy_chk BUILTIN(__strncpy_chk) 450char *__strncpy_chk(char *restrict s1, const char *restrict s2, size_t n, size_t destlen); 451 452#define strncpy(a,b,n) __strncpy_chk(a,b,n,(size_t)-1) 453 454#else /* VARIANT */ 455 456#define strncpy BUILTIN(strncpy) 457char *strncpy(char *restrict s1, const char *restrict s2, size_t n); 458 459#endif /* VARIANT */ 460 461 462void strncpy_null_dst(char *x) { 463 strncpy(NULL, x, 5); // expected-warning{{Null pointer argument in call to string copy function}} 464} 465 466void strncpy_null_src(char *x) { 467 strncpy(x, NULL, 5); // expected-warning{{Null pointer argument in call to string copy function}} 468} 469 470void strncpy_fn(char *x) { 471 strncpy(x, (char*)&strcpy_fn, 5); // expected-warning{{Argument to string copy function is the address of the function 'strcpy_fn', which is not a null-terminated string}} 472} 473 474void strncpy_effects(char *x, char *y) { 475 char a = x[0]; 476 477 clang_analyzer_eval(strncpy(x, y, 5) == x); // expected-warning{{TRUE}} 478 clang_analyzer_eval(strlen(x) == strlen(y)); // expected-warning{{UNKNOWN}} 479 clang_analyzer_eval(a == x[0]); // expected-warning{{UNKNOWN}} 480} 481 482void strncpy_overflow(char *y) { 483 char x[4]; 484 if (strlen(y) == 4) 485 strncpy(x, y, 5); // expected-warning{{Size argument is greater than the length of the destination buffer}} 486} 487 488void strncpy_no_overflow(char *y) { 489 char x[4]; 490 if (strlen(y) == 3) 491 strncpy(x, y, 5); // expected-warning{{Size argument is greater than the length of the destination buffer}} 492} 493 494void strncpy_no_overflow2(char *y, int n) { 495 if (n <= 4) 496 return; 497 498 char x[4]; 499 if (strlen(y) == 3) 500 strncpy(x, y, n); // expected-warning{{Size argument is greater than the length of the destination buffer}} 501} 502 503void strncpy_truncate(char *y) { 504 char x[4]; 505 if (strlen(y) == 4) 506 strncpy(x, y, 3); // no-warning 507} 508 509void strncpy_no_truncate(char *y) { 510 char x[4]; 511 if (strlen(y) == 3) 512 strncpy(x, y, 3); // no-warning 513} 514 515void strncpy_exactly_matching_buffer(char *y) { 516 char x[4]; 517 strncpy(x, y, 4); // no-warning 518 519 // strncpy does not null-terminate, so we have no idea what the strlen is 520 // after this. 521 clang_analyzer_eval(strlen(x) > 4); // expected-warning{{UNKNOWN}} 522} 523 524void strncpy_exactly_matching_buffer2(char *y) { 525 if (strlen(y) >= 4) 526 return; 527 528 char x[4]; 529 strncpy(x, y, 4); // no-warning 530 531 // This time, we know that y fits in x anyway. 532 clang_analyzer_eval(strlen(x) <= 3); // expected-warning{{TRUE}} 533} 534 535void strncpy_zero(char *src) { 536 char dst[] = "123"; 537 strncpy(dst, src, 0); // no-warning 538} 539 540void strncpy_empty() { 541 char dst[] = "123"; 542 char src[] = ""; 543 strncpy(dst, src, 4); // no-warning 544} 545 546//===----------------------------------------------------------------------=== 547// strncat() 548//===----------------------------------------------------------------------=== 549 550#ifdef VARIANT 551 552#define __strncat_chk BUILTIN(__strncat_chk) 553char *__strncat_chk(char *restrict s1, const char *restrict s2, size_t n, size_t destlen); 554 555#define strncat(a,b,c) __strncat_chk(a,b,c, (size_t)-1) 556 557#else /* VARIANT */ 558 559#define strncat BUILTIN(strncat) 560char *strncat(char *restrict s1, const char *restrict s2, size_t n); 561 562#endif /* VARIANT */ 563 564 565void strncat_null_dst(char *x) { 566 strncat(NULL, x, 4); // expected-warning{{Null pointer argument in call to string copy function}} 567} 568 569void strncat_null_src(char *x) { 570 strncat(x, NULL, 4); // expected-warning{{Null pointer argument in call to string copy function}} 571} 572 573void strncat_fn(char *x) { 574 strncat(x, (char*)&strncat_fn, 4); // expected-warning{{Argument to string copy function is the address of the function 'strncat_fn', which is not a null-terminated string}} 575} 576 577void strncat_effects(char *y) { 578 char x[8] = "123"; 579 size_t orig_len = strlen(x); 580 char a = x[0]; 581 582 if (strlen(y) != 4) 583 return; 584 585 clang_analyzer_eval(strncat(x, y, strlen(y)) == x); // expected-warning{{TRUE}} 586 clang_analyzer_eval(strlen(x) == (orig_len + strlen(y))); // expected-warning{{TRUE}} 587} 588 589void strncat_overflow_0(char *y) { 590 char x[4] = "12"; 591 if (strlen(y) == 4) 592 strncat(x, y, strlen(y)); // expected-warning{{Size argument is greater than the free space in the destination buffer}} 593} 594 595void strncat_overflow_1(char *y) { 596 char x[4] = "12"; 597 if (strlen(y) == 3) 598 strncat(x, y, strlen(y)); // expected-warning{{Size argument is greater than the free space in the destination buffer}} 599} 600 601void strncat_overflow_2(char *y) { 602 char x[4] = "12"; 603 if (strlen(y) == 2) 604 strncat(x, y, strlen(y)); // expected-warning{{Size argument is greater than the free space in the destination buffer}} 605} 606 607void strncat_overflow_3(char *y) { 608 char x[4] = "12"; 609 if (strlen(y) == 4) 610 strncat(x, y, 2); // expected-warning{{Size argument is greater than the free space in the destination buffer}} 611} 612void strncat_no_overflow_1(char *y) { 613 char x[5] = "12"; 614 if (strlen(y) == 2) 615 strncat(x, y, strlen(y)); // no-warning 616} 617 618void strncat_no_overflow_2(char *y) { 619 char x[4] = "12"; 620 if (strlen(y) == 4) 621 strncat(x, y, 1); // no-warning 622} 623 624void strncat_symbolic_dst_length(char *dst) { 625 strncat(dst, "1234", 5); 626 clang_analyzer_eval(strlen(dst) >= 4); // expected-warning{{TRUE}} 627} 628 629void strncat_symbolic_src_length(char *src) { 630 char dst[8] = "1234"; 631 strncat(dst, src, 3); 632 clang_analyzer_eval(strlen(dst) >= 4); // expected-warning{{TRUE}} 633 634 char dst2[8] = "1234"; 635 strncat(dst2, src, 4); // expected-warning{{Size argument is greater than the free space in the destination buffer}} 636} 637 638void strncat_unknown_src_length(char *src, int offset) { 639 char dst[8] = "1234"; 640 strncat(dst, &src[offset], 3); 641 clang_analyzer_eval(strlen(dst) >= 4); // expected-warning{{TRUE}} 642 643 char dst2[8] = "1234"; 644 strncat(dst2, &src[offset], 4); // expected-warning{{Size argument is greater than the free space in the destination buffer}} 645} 646 647// There is no strncat_unknown_dst_length because if we can't get a symbolic 648// length for the "before" strlen, we won't be able to set one for "after". 649 650void strncat_symbolic_limit(unsigned limit) { 651 char dst[6] = "1234"; 652 char src[] = "567"; 653 strncat(dst, src, limit); // no-warning 654 655 clang_analyzer_eval(strlen(dst) >= 4); // expected-warning{{TRUE}} 656 clang_analyzer_eval(strlen(dst) == 4); // expected-warning{{UNKNOWN}} 657} 658 659void strncat_unknown_limit(float limit) { 660 char dst[6] = "1234"; 661 char src[] = "567"; 662 strncat(dst, src, (size_t)limit); // no-warning 663 664 clang_analyzer_eval(strlen(dst) >= 4); // expected-warning{{TRUE}} 665 clang_analyzer_eval(strlen(dst) == 4); // expected-warning{{UNKNOWN}} 666} 667 668void strncat_too_big(char *dst, char *src) { 669 if (strlen(dst) != (((size_t)0) - 2)) 670 return; 671 if (strlen(src) != 2) 672 return; 673 strncat(dst, src, 2); // expected-warning{{This expression will create a string whose length is too big to be represented as a size_t}} 674} 675 676void strncat_zero(char *src) { 677 char dst[] = "123"; 678 strncat(dst, src, 0); // no-warning 679} 680 681void strncat_empty() { 682 char dst[8] = "123"; 683 char src[] = ""; 684 strncat(dst, src, 4); // no-warning 685} 686 687//===----------------------------------------------------------------------=== 688// strcmp() 689//===----------------------------------------------------------------------=== 690 691#define strcmp BUILTIN(strcmp) 692int strcmp(const char * s1, const char * s2); 693 694void strcmp_constant0() { 695 clang_analyzer_eval(strcmp("123", "123") == 0); // expected-warning{{TRUE}} 696} 697 698void strcmp_constant_and_var_0() { 699 char *x = "123"; 700 clang_analyzer_eval(strcmp(x, "123") == 0); // expected-warning{{TRUE}} 701} 702 703void strcmp_constant_and_var_1() { 704 char *x = "123"; 705 clang_analyzer_eval(strcmp("123", x) == 0); // expected-warning{{TRUE}} 706} 707 708void strcmp_0() { 709 char *x = "123"; 710 char *y = "123"; 711 clang_analyzer_eval(strcmp(x, y) == 0); // expected-warning{{TRUE}} 712} 713 714void strcmp_1() { 715 char *x = "234"; 716 char *y = "123"; 717 clang_analyzer_eval(strcmp(x, y) == 1); // expected-warning{{TRUE}} 718} 719 720void strcmp_2() { 721 char *x = "123"; 722 char *y = "234"; 723 clang_analyzer_eval(strcmp(x, y) == -1); // expected-warning{{TRUE}} 724} 725 726void strcmp_null_0() { 727 char *x = NULL; 728 char *y = "123"; 729 strcmp(x, y); // expected-warning{{Null pointer argument in call to string comparison function}} 730} 731 732void strcmp_null_1() { 733 char *x = "123"; 734 char *y = NULL; 735 strcmp(x, y); // expected-warning{{Null pointer argument in call to string comparison function}} 736} 737 738void strcmp_diff_length_0() { 739 char *x = "12345"; 740 char *y = "234"; 741 clang_analyzer_eval(strcmp(x, y) == -1); // expected-warning{{TRUE}} 742} 743 744void strcmp_diff_length_1() { 745 char *x = "123"; 746 char *y = "23456"; 747 clang_analyzer_eval(strcmp(x, y) == -1); // expected-warning{{TRUE}} 748} 749 750void strcmp_diff_length_2() { 751 char *x = "12345"; 752 char *y = "123"; 753 clang_analyzer_eval(strcmp(x, y) == 1); // expected-warning{{TRUE}} 754} 755 756void strcmp_diff_length_3() { 757 char *x = "123"; 758 char *y = "12345"; 759 clang_analyzer_eval(strcmp(x, y) == -1); // expected-warning{{TRUE}} 760} 761 762void strcmp_embedded_null () { 763 clang_analyzer_eval(strcmp("\0z", "\0y") == 0); // expected-warning{{TRUE}} 764} 765 766void strcmp_unknown_arg (char *unknown) { 767 clang_analyzer_eval(strcmp(unknown, unknown) == 0); // expected-warning{{TRUE}} 768} 769 770//===----------------------------------------------------------------------=== 771// strncmp() 772//===----------------------------------------------------------------------=== 773 774#define strncmp BUILTIN(strncmp) 775int strncmp(const char *s1, const char *s2, size_t n); 776 777void strncmp_constant0() { 778 clang_analyzer_eval(strncmp("123", "123", 3) == 0); // expected-warning{{TRUE}} 779} 780 781void strncmp_constant_and_var_0() { 782 char *x = "123"; 783 clang_analyzer_eval(strncmp(x, "123", 3) == 0); // expected-warning{{TRUE}} 784} 785 786void strncmp_constant_and_var_1() { 787 char *x = "123"; 788 clang_analyzer_eval(strncmp("123", x, 3) == 0); // expected-warning{{TRUE}} 789} 790 791void strncmp_0() { 792 char *x = "123"; 793 char *y = "123"; 794 clang_analyzer_eval(strncmp(x, y, 3) == 0); // expected-warning{{TRUE}} 795} 796 797void strncmp_1() { 798 char *x = "234"; 799 char *y = "123"; 800 clang_analyzer_eval(strncmp(x, y, 3) == 1); // expected-warning{{TRUE}} 801} 802 803void strncmp_2() { 804 char *x = "123"; 805 char *y = "234"; 806 clang_analyzer_eval(strncmp(x, y, 3) == -1); // expected-warning{{TRUE}} 807} 808 809void strncmp_null_0() { 810 char *x = NULL; 811 char *y = "123"; 812 strncmp(x, y, 3); // expected-warning{{Null pointer argument in call to string comparison function}} 813} 814 815void strncmp_null_1() { 816 char *x = "123"; 817 char *y = NULL; 818 strncmp(x, y, 3); // expected-warning{{Null pointer argument in call to string comparison function}} 819} 820 821void strncmp_diff_length_0() { 822 char *x = "12345"; 823 char *y = "234"; 824 clang_analyzer_eval(strncmp(x, y, 5) == -1); // expected-warning{{TRUE}} 825} 826 827void strncmp_diff_length_1() { 828 char *x = "123"; 829 char *y = "23456"; 830 clang_analyzer_eval(strncmp(x, y, 5) == -1); // expected-warning{{TRUE}} 831} 832 833void strncmp_diff_length_2() { 834 char *x = "12345"; 835 char *y = "123"; 836 clang_analyzer_eval(strncmp(x, y, 5) == 1); // expected-warning{{TRUE}} 837} 838 839void strncmp_diff_length_3() { 840 char *x = "123"; 841 char *y = "12345"; 842 clang_analyzer_eval(strncmp(x, y, 5) == -1); // expected-warning{{TRUE}} 843} 844 845void strncmp_diff_length_4() { 846 char *x = "123"; 847 char *y = "12345"; 848 clang_analyzer_eval(strncmp(x, y, 3) == 0); // expected-warning{{TRUE}} 849} 850 851void strncmp_diff_length_5() { 852 char *x = "012"; 853 char *y = "12345"; 854 clang_analyzer_eval(strncmp(x, y, 3) == -1); // expected-warning{{TRUE}} 855} 856 857void strncmp_diff_length_6() { 858 char *x = "234"; 859 char *y = "12345"; 860 clang_analyzer_eval(strncmp(x, y, 3) == 1); // expected-warning{{TRUE}} 861} 862 863void strncmp_embedded_null () { 864 clang_analyzer_eval(strncmp("ab\0zz", "ab\0yy", 4) == 0); // expected-warning{{TRUE}} 865} 866 867//===----------------------------------------------------------------------=== 868// strcasecmp() 869//===----------------------------------------------------------------------=== 870 871#define strcasecmp BUILTIN(strcasecmp) 872int strcasecmp(const char *s1, const char *s2); 873 874void strcasecmp_constant0() { 875 clang_analyzer_eval(strcasecmp("abc", "Abc") == 0); // expected-warning{{TRUE}} 876} 877 878void strcasecmp_constant_and_var_0() { 879 char *x = "abc"; 880 clang_analyzer_eval(strcasecmp(x, "Abc") == 0); // expected-warning{{TRUE}} 881} 882 883void strcasecmp_constant_and_var_1() { 884 char *x = "abc"; 885 clang_analyzer_eval(strcasecmp("Abc", x) == 0); // expected-warning{{TRUE}} 886} 887 888void strcasecmp_0() { 889 char *x = "abc"; 890 char *y = "Abc"; 891 clang_analyzer_eval(strcasecmp(x, y) == 0); // expected-warning{{TRUE}} 892} 893 894void strcasecmp_1() { 895 char *x = "Bcd"; 896 char *y = "abc"; 897 clang_analyzer_eval(strcasecmp(x, y) == 1); // expected-warning{{TRUE}} 898} 899 900void strcasecmp_2() { 901 char *x = "abc"; 902 char *y = "Bcd"; 903 clang_analyzer_eval(strcasecmp(x, y) == -1); // expected-warning{{TRUE}} 904} 905 906void strcasecmp_null_0() { 907 char *x = NULL; 908 char *y = "123"; 909 strcasecmp(x, y); // expected-warning{{Null pointer argument in call to string comparison function}} 910} 911 912void strcasecmp_null_1() { 913 char *x = "123"; 914 char *y = NULL; 915 strcasecmp(x, y); // expected-warning{{Null pointer argument in call to string comparison function}} 916} 917 918void strcasecmp_diff_length_0() { 919 char *x = "abcde"; 920 char *y = "aBd"; 921 clang_analyzer_eval(strcasecmp(x, y) == -1); // expected-warning{{TRUE}} 922} 923 924void strcasecmp_diff_length_1() { 925 char *x = "abc"; 926 char *y = "aBdef"; 927 clang_analyzer_eval(strcasecmp(x, y) == -1); // expected-warning{{TRUE}} 928} 929 930void strcasecmp_diff_length_2() { 931 char *x = "aBcDe"; 932 char *y = "abc"; 933 clang_analyzer_eval(strcasecmp(x, y) == 1); // expected-warning{{TRUE}} 934} 935 936void strcasecmp_diff_length_3() { 937 char *x = "aBc"; 938 char *y = "abcde"; 939 clang_analyzer_eval(strcasecmp(x, y) == -1); // expected-warning{{TRUE}} 940} 941 942void strcasecmp_embedded_null () { 943 clang_analyzer_eval(strcasecmp("ab\0zz", "ab\0yy") == 0); // expected-warning{{TRUE}} 944} 945 946//===----------------------------------------------------------------------=== 947// strncasecmp() 948//===----------------------------------------------------------------------=== 949 950#define strncasecmp BUILTIN(strncasecmp) 951int strncasecmp(const char *s1, const char *s2, size_t n); 952 953void strncasecmp_constant0() { 954 clang_analyzer_eval(strncasecmp("abc", "Abc", 3) == 0); // expected-warning{{TRUE}} 955} 956 957void strncasecmp_constant_and_var_0() { 958 char *x = "abc"; 959 clang_analyzer_eval(strncasecmp(x, "Abc", 3) == 0); // expected-warning{{TRUE}} 960} 961 962void strncasecmp_constant_and_var_1() { 963 char *x = "abc"; 964 clang_analyzer_eval(strncasecmp("Abc", x, 3) == 0); // expected-warning{{TRUE}} 965} 966 967void strncasecmp_0() { 968 char *x = "abc"; 969 char *y = "Abc"; 970 clang_analyzer_eval(strncasecmp(x, y, 3) == 0); // expected-warning{{TRUE}} 971} 972 973void strncasecmp_1() { 974 char *x = "Bcd"; 975 char *y = "abc"; 976 clang_analyzer_eval(strncasecmp(x, y, 3) == 1); // expected-warning{{TRUE}} 977} 978 979void strncasecmp_2() { 980 char *x = "abc"; 981 char *y = "Bcd"; 982 clang_analyzer_eval(strncasecmp(x, y, 3) == -1); // expected-warning{{TRUE}} 983} 984 985void strncasecmp_null_0() { 986 char *x = NULL; 987 char *y = "123"; 988 strncasecmp(x, y, 3); // expected-warning{{Null pointer argument in call to string comparison function}} 989} 990 991void strncasecmp_null_1() { 992 char *x = "123"; 993 char *y = NULL; 994 strncasecmp(x, y, 3); // expected-warning{{Null pointer argument in call to string comparison function}} 995} 996 997void strncasecmp_diff_length_0() { 998 char *x = "abcde"; 999 char *y = "aBd"; 1000 clang_analyzer_eval(strncasecmp(x, y, 5) == -1); // expected-warning{{TRUE}} 1001} 1002 1003void strncasecmp_diff_length_1() { 1004 char *x = "abc"; 1005 char *y = "aBdef"; 1006 clang_analyzer_eval(strncasecmp(x, y, 5) == -1); // expected-warning{{TRUE}} 1007} 1008 1009void strncasecmp_diff_length_2() { 1010 char *x = "aBcDe"; 1011 char *y = "abc"; 1012 clang_analyzer_eval(strncasecmp(x, y, 5) == 1); // expected-warning{{TRUE}} 1013} 1014 1015void strncasecmp_diff_length_3() { 1016 char *x = "aBc"; 1017 char *y = "abcde"; 1018 clang_analyzer_eval(strncasecmp(x, y, 5) == -1); // expected-warning{{TRUE}} 1019} 1020 1021void strncasecmp_diff_length_4() { 1022 char *x = "abcde"; 1023 char *y = "aBc"; 1024 clang_analyzer_eval(strncasecmp(x, y, 3) == 0); // expected-warning{{TRUE}} 1025} 1026 1027void strncasecmp_diff_length_5() { 1028 char *x = "abcde"; 1029 char *y = "aBd"; 1030 clang_analyzer_eval(strncasecmp(x, y, 3) == -1); // expected-warning{{TRUE}} 1031} 1032 1033void strncasecmp_diff_length_6() { 1034 char *x = "aBDe"; 1035 char *y = "abc"; 1036 clang_analyzer_eval(strncasecmp(x, y, 3) == 1); // expected-warning{{TRUE}} 1037} 1038 1039void strncasecmp_embedded_null () { 1040 clang_analyzer_eval(strncasecmp("ab\0zz", "ab\0yy", 4) == 0); // expected-warning{{TRUE}} 1041} 1042