contrib/compiler-rt/lib/esan/esan_interceptors.cpp

   1 //===-- esan_interceptors.cpp ---------------------------------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file is a part of EfficiencySanitizer, a family of performance tuners.
  11 //
  12 // Interception routines for the esan run-time.
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "esan.h"
  16 #include "esan_shadow.h"
  17 #include "interception/interception.h"
  18 #include "sanitizer_common/sanitizer_common.h"
  19 #include "sanitizer_common/sanitizer_libc.h"
  20 #include "sanitizer_common/sanitizer_linux.h"
  21 #include "sanitizer_common/sanitizer_stacktrace.h"
  22
  23 using namespace __esan; // NOLINT
  24
  25 #define CUR_PC() (StackTrace::GetCurrentPc())
  26
  27 //===----------------------------------------------------------------------===//
  28 // Interception via sanitizer common interceptors
  29 //===----------------------------------------------------------------------===//
  30
  31 // Get the per-platform defines for what is possible to intercept
  32 #include "sanitizer_common/sanitizer_platform_interceptors.h"
  33
  34 // TODO(bruening): tsan disables several interceptors (getpwent, etc.) claiming
  35 // that interception is a perf hit: should we do the same?
  36
  37 // We have no need to intercept:
  38 #undef SANITIZER_INTERCEPT_TLS_GET_ADDR
  39
  40 // TODO(bruening): the common realpath interceptor assumes malloc is
  41 // intercepted!  We should try to parametrize that, though we'll
  42 // intercept malloc soon ourselves and can then remove this undef.
  43 #undef SANITIZER_INTERCEPT_REALPATH
  44
  45 // We provide our own version:
  46 #undef SANITIZER_INTERCEPT_SIGPROCMASK
  47
  48 #define COMMON_INTERCEPTOR_NOTHING_IS_INITIALIZED (!EsanIsInitialized)
  49
  50 #define COMMON_INTERCEPT_FUNCTION(name) INTERCEPT_FUNCTION(name)
  51 #define COMMON_INTERCEPT_FUNCTION_VER(name, ver)                          \
  52   INTERCEPT_FUNCTION_VER(name, ver)
  53
  54 // We must initialize during early interceptors, to support tcmalloc.
  55 // This means that for some apps we fully initialize prior to
  56 // __esan_init() being called.
  57 // We currently do not use ctx.
  58 #define COMMON_INTERCEPTOR_ENTER(ctx, func, ...)                               \
  59   do {                                                                         \
  60     if (UNLIKELY(COMMON_INTERCEPTOR_NOTHING_IS_INITIALIZED)) {                 \
  61       if (!UNLIKELY(EsanDuringInit))                                           \
  62         initializeLibrary(__esan_which_tool);                                  \
  63       return REAL(func)(__VA_ARGS__);                                          \
  64     }                                                                          \
  65     ctx = nullptr;                                                             \
  66     (void)ctx;                                                                 \
  67   } while (false)
  68
  69 #define COMMON_INTERCEPTOR_ENTER_NOIGNORE(ctx, func, ...)                      \
  70   COMMON_INTERCEPTOR_ENTER(ctx, func, __VA_ARGS__)
  71
  72 #define COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ptr, size)                         \
  73   processRangeAccess(CUR_PC(), (uptr)ptr, size, true)
  74
  75 #define COMMON_INTERCEPTOR_READ_RANGE(ctx, ptr, size)                          \
  76   processRangeAccess(CUR_PC(), (uptr)ptr, size, false)
  77
  78 // This is only called if the app explicitly calls exit(), not on
  79 // a normal exit.
  80 #define COMMON_INTERCEPTOR_ON_EXIT(ctx) finalizeLibrary()
  81
  82 #define COMMON_INTERCEPTOR_FILE_OPEN(ctx, file, path)                          \
  83   do {                                                                         \
  84     (void)(ctx);                                                               \
  85     (void)(file);                                                              \
  86     (void)(path);                                                              \
  87   } while (false)
  88 #define COMMON_INTERCEPTOR_FILE_CLOSE(ctx, file)                               \
  89   do {                                                                         \
  90     (void)(ctx);                                                               \
  91     (void)(file);                                                              \
  92   } while (false)
  93 #define COMMON_INTERCEPTOR_LIBRARY_LOADED(filename, handle)                    \
  94   do {                                                                         \
  95     (void)(filename);                                                          \
  96     (void)(handle);                                                            \
  97   } while (false)
  98 #define COMMON_INTERCEPTOR_LIBRARY_UNLOADED()                                  \
  99   do {                                                                         \
 100   } while (false)
 101 #define COMMON_INTERCEPTOR_ACQUIRE(ctx, u)                                     \
 102   do {                                                                         \
 103     (void)(ctx);                                                               \
 104     (void)(u);                                                                 \
 105   } while (false)
 106 #define COMMON_INTERCEPTOR_RELEASE(ctx, u)                                     \
 107   do {                                                                         \
 108     (void)(ctx);                                                               \
 109     (void)(u);                                                                 \
 110   } while (false)
 111 #define COMMON_INTERCEPTOR_DIR_ACQUIRE(ctx, path)                              \
 112   do {                                                                         \
 113     (void)(ctx);                                                               \
 114     (void)(path);                                                              \
 115   } while (false)
 116 #define COMMON_INTERCEPTOR_FD_ACQUIRE(ctx, fd)                                 \
 117   do {                                                                         \
 118     (void)(ctx);                                                               \
 119     (void)(fd);                                                                \
 120   } while (false)
 121 #define COMMON_INTERCEPTOR_FD_RELEASE(ctx, fd)                                 \
 122   do {                                                                         \
 123     (void)(ctx);                                                               \
 124     (void)(fd);                                                                \
 125   } while (false)
 126 #define COMMON_INTERCEPTOR_FD_ACCESS(ctx, fd)                                  \
 127   do {                                                                         \
 128     (void)(ctx);                                                               \
 129     (void)(fd);                                                                \
 130   } while (false)
 131 #define COMMON_INTERCEPTOR_FD_SOCKET_ACCEPT(ctx, fd, newfd)                    \
 132   do {                                                                         \
 133     (void)(ctx);                                                               \
 134     (void)(fd);                                                                \
 135     (void)(newfd);                                                             \
 136   } while (false)
 137 #define COMMON_INTERCEPTOR_SET_THREAD_NAME(ctx, name)                          \
 138   do {                                                                         \
 139     (void)(ctx);                                                               \
 140     (void)(name);                                                              \
 141   } while (false)
 142 #define COMMON_INTERCEPTOR_SET_PTHREAD_NAME(ctx, thread, name)                 \
 143   do {                                                                         \
 144     (void)(ctx);                                                               \
 145     (void)(thread);                                                            \
 146     (void)(name);                                                              \
 147   } while (false)
 148 #define COMMON_INTERCEPTOR_BLOCK_REAL(name) REAL(name)
 149 #define COMMON_INTERCEPTOR_MUTEX_LOCK(ctx, m)                                  \
 150   do {                                                                         \
 151     (void)(ctx);                                                               \
 152     (void)(m);                                                                 \
 153   } while (false)
 154 #define COMMON_INTERCEPTOR_MUTEX_UNLOCK(ctx, m)                                \
 155   do {                                                                         \
 156     (void)(ctx);                                                               \
 157     (void)(m);                                                                 \
 158   } while (false)
 159 #define COMMON_INTERCEPTOR_MUTEX_REPAIR(ctx, m)                                \
 160   do {                                                                         \
 161     (void)(ctx);                                                               \
 162     (void)(m);                                                                 \
 163   } while (false)
 164 #define COMMON_INTERCEPTOR_HANDLE_RECVMSG(ctx, msg)                            \
 165   do {                                                                         \
 166     (void)(ctx);                                                               \
 167     (void)(msg);                                                               \
 168   } while (false)
 169 #define COMMON_INTERCEPTOR_USER_CALLBACK_START()                               \
 170   do {                                                                         \
 171   } while (false)
 172 #define COMMON_INTERCEPTOR_USER_CALLBACK_END()                                 \
 173   do {                                                                         \
 174   } while (false)
 175
 176 #include "sanitizer_common/sanitizer_common_interceptors.inc"
 177
 178 //===----------------------------------------------------------------------===//
 179 // Syscall interception
 180 //===----------------------------------------------------------------------===//
 181
 182 // We want the caller's PC b/c unlike the other function interceptors these
 183 // are separate pre and post functions called around the app's syscall().
 184
 185 #define COMMON_SYSCALL_PRE_READ_RANGE(ptr, size)                               \
 186   processRangeAccess(GET_CALLER_PC(), (uptr)ptr, size, false)
 187
 188 #define COMMON_SYSCALL_PRE_WRITE_RANGE(ptr, size)                              \
 189   do {                                                                         \
 190     (void)(ptr);                                                               \
 191     (void)(size);                                                              \
 192   } while (false)
 193
 194 #define COMMON_SYSCALL_POST_READ_RANGE(ptr, size)                              \
 195   do {                                                                         \
 196     (void)(ptr);                                                               \
 197     (void)(size);                                                              \
 198   } while (false)
 199
 200 // The actual amount written is in post, not pre.
 201 #define COMMON_SYSCALL_POST_WRITE_RANGE(ptr, size)                             \
 202   processRangeAccess(GET_CALLER_PC(), (uptr)ptr, size, true)
 203
 204 #define COMMON_SYSCALL_ACQUIRE(addr)                                           \
 205   do {                                                                         \
 206     (void)(addr);                                                              \
 207   } while (false)
 208 #define COMMON_SYSCALL_RELEASE(addr)                                           \
 209   do {                                                                         \
 210     (void)(addr);                                                              \
 211   } while (false)
 212 #define COMMON_SYSCALL_FD_CLOSE(fd)                                            \
 213   do {                                                                         \
 214     (void)(fd);                                                                \
 215   } while (false)
 216 #define COMMON_SYSCALL_FD_ACQUIRE(fd)                                          \
 217   do {                                                                         \
 218     (void)(fd);                                                                \
 219   } while (false)
 220 #define COMMON_SYSCALL_FD_RELEASE(fd)                                          \
 221   do {                                                                         \
 222     (void)(fd);                                                                \
 223   } while (false)
 224 #define COMMON_SYSCALL_PRE_FORK()                                              \
 225   do {                                                                         \
 226   } while (false)
 227 #define COMMON_SYSCALL_POST_FORK(res)                                          \
 228   do {                                                                         \
 229     (void)(res);                                                               \
 230   } while (false)
 231
 232 #include "sanitizer_common/sanitizer_common_syscalls.inc"
 233
 234 //===----------------------------------------------------------------------===//
 235 // Custom interceptors
 236 //===----------------------------------------------------------------------===//
 237
 238 // TODO(bruening): move more of these to the common interception pool as they
 239 // are shared with tsan and asan.
 240 // While our other files match LLVM style, here we match sanitizer style as we
 241 // expect to move these to the common pool.
 242
 243 INTERCEPTOR(char *, strcpy, char *dst, const char *src) { // NOLINT
 244   void *ctx;
 245   COMMON_INTERCEPTOR_ENTER(ctx, strcpy, dst, src);
 246   uptr srclen = internal_strlen(src);
 247   COMMON_INTERCEPTOR_WRITE_RANGE(ctx, dst, srclen + 1);
 248   COMMON_INTERCEPTOR_READ_RANGE(ctx, src, srclen + 1);
 249   return REAL(strcpy)(dst, src); // NOLINT
 250 }
 251
 252 INTERCEPTOR(char *, strncpy, char *dst, char *src, uptr n) {
 253   void *ctx;
 254   COMMON_INTERCEPTOR_ENTER(ctx, strncpy, dst, src, n);
 255   uptr srclen = internal_strnlen(src, n);
 256   uptr copied_size = srclen + 1 > n ? n : srclen + 1;
 257   COMMON_INTERCEPTOR_WRITE_RANGE(ctx, dst, copied_size);
 258   COMMON_INTERCEPTOR_READ_RANGE(ctx, src, copied_size);
 259   return REAL(strncpy)(dst, src, n);
 260 }
 261
 262 INTERCEPTOR(int, open, const char *name, int flags, int mode) {
 263   void *ctx;
 264   COMMON_INTERCEPTOR_ENTER(ctx, open, name, flags, mode);
 265   COMMON_INTERCEPTOR_READ_STRING(ctx, name, 0);
 266   return REAL(open)(name, flags, mode);
 267 }
 268
 269 #if SANITIZER_LINUX
 270 INTERCEPTOR(int, open64, const char *name, int flags, int mode) {
 271   void *ctx;
 272   COMMON_INTERCEPTOR_ENTER(ctx, open64, name, flags, mode);
 273   COMMON_INTERCEPTOR_READ_STRING(ctx, name, 0);
 274   return REAL(open64)(name, flags, mode);
 275 }
 276 #define ESAN_MAYBE_INTERCEPT_OPEN64 INTERCEPT_FUNCTION(open64)
 277 #else
 278 #define ESAN_MAYBE_INTERCEPT_OPEN64
 279 #endif
 280
 281 INTERCEPTOR(int, creat, const char *name, int mode) {
 282   void *ctx;
 283   COMMON_INTERCEPTOR_ENTER(ctx, creat, name, mode);
 284   COMMON_INTERCEPTOR_READ_STRING(ctx, name, 0);
 285   return REAL(creat)(name, mode);
 286 }
 287
 288 #if SANITIZER_LINUX
 289 INTERCEPTOR(int, creat64, const char *name, int mode) {
 290   void *ctx;
 291   COMMON_INTERCEPTOR_ENTER(ctx, creat64, name, mode);
 292   COMMON_INTERCEPTOR_READ_STRING(ctx, name, 0);
 293   return REAL(creat64)(name, mode);
 294 }
 295 #define ESAN_MAYBE_INTERCEPT_CREAT64 INTERCEPT_FUNCTION(creat64)
 296 #else
 297 #define ESAN_MAYBE_INTERCEPT_CREAT64
 298 #endif
 299
 300 INTERCEPTOR(int, unlink, char *path) {
 301   void *ctx;
 302   COMMON_INTERCEPTOR_ENTER(ctx, unlink, path);
 303   COMMON_INTERCEPTOR_READ_STRING(ctx, path, 0);
 304   return REAL(unlink)(path);
 305 }
 306
 307 INTERCEPTOR(uptr, fread, void *ptr, uptr size, uptr nmemb, void *f) {
 308   void *ctx;
 309   COMMON_INTERCEPTOR_ENTER(ctx, fread, ptr, size, nmemb, f);
 310   COMMON_INTERCEPTOR_WRITE_RANGE(ctx, ptr, size * nmemb);
 311   return REAL(fread)(ptr, size, nmemb, f);
 312 }
 313
 314 INTERCEPTOR(uptr, fwrite, const void *p, uptr size, uptr nmemb, void *f) {
 315   void *ctx;
 316   COMMON_INTERCEPTOR_ENTER(ctx, fwrite, p, size, nmemb, f);
 317   COMMON_INTERCEPTOR_READ_RANGE(ctx, p, size * nmemb);
 318   return REAL(fwrite)(p, size, nmemb, f);
 319 }
 320
 321 INTERCEPTOR(int, puts, const char *s) {
 322   void *ctx;
 323   COMMON_INTERCEPTOR_ENTER(ctx, puts, s);
 324   COMMON_INTERCEPTOR_READ_RANGE(ctx, s, internal_strlen(s));
 325   return REAL(puts)(s);
 326 }
 327
 328 INTERCEPTOR(int, rmdir, char *path) {
 329   void *ctx;
 330   COMMON_INTERCEPTOR_ENTER(ctx, rmdir, path);
 331   COMMON_INTERCEPTOR_READ_STRING(ctx, path, 0);
 332   return REAL(rmdir)(path);
 333 }
 334
 335 //===----------------------------------------------------------------------===//
 336 // Shadow-related interceptors
 337 //===----------------------------------------------------------------------===//
 338
 339 // These are candidates for sharing with all sanitizers if shadow memory
 340 // support is also standardized.
 341
 342 INTERCEPTOR(void *, mmap, void *addr, SIZE_T sz, int prot, int flags,
 343                  int fd, OFF_T off) {
 344   if (UNLIKELY(REAL(mmap) == nullptr)) {
 345     // With esan init during interceptor init and a static libc preventing
 346     // our early-calloc from triggering, we can end up here before our
 347     // REAL pointer is set up.
 348     return (void *)internal_mmap(addr, sz, prot, flags, fd, off);
 349   }
 350   void *ctx;
 351   COMMON_INTERCEPTOR_ENTER(ctx, mmap, addr, sz, prot, flags, fd, off);
 352   if (!fixMmapAddr(&addr, sz, flags))
 353     return (void *)-1;
 354   void *result = REAL(mmap)(addr, sz, prot, flags, fd, off);
 355   return (void *)checkMmapResult((uptr)result, sz);
 356 }
 357
 358 #if SANITIZER_LINUX
 359 INTERCEPTOR(void *, mmap64, void *addr, SIZE_T sz, int prot, int flags,
 360                  int fd, OFF64_T off) {
 361   void *ctx;
 362   COMMON_INTERCEPTOR_ENTER(ctx, mmap64, addr, sz, prot, flags, fd, off);
 363   if (!fixMmapAddr(&addr, sz, flags))
 364     return (void *)-1;
 365   void *result = REAL(mmap64)(addr, sz, prot, flags, fd, off);
 366   return (void *)checkMmapResult((uptr)result, sz);
 367 }
 368 #define ESAN_MAYBE_INTERCEPT_MMAP64 INTERCEPT_FUNCTION(mmap64)
 369 #else
 370 #define ESAN_MAYBE_INTERCEPT_MMAP64
 371 #endif
 372
 373 //===----------------------------------------------------------------------===//
 374 // Signal-related interceptors
 375 //===----------------------------------------------------------------------===//
 376
 377 #if SANITIZER_LINUX
 378 typedef void (*signal_handler_t)(int);
 379 INTERCEPTOR(signal_handler_t, signal, int signum, signal_handler_t handler) {
 380   void *ctx;
 381   COMMON_INTERCEPTOR_ENTER(ctx, signal, signum, handler);
 382   signal_handler_t result;
 383   if (!processSignal(signum, handler, &result))
 384     return result;
 385   else
 386     return REAL(signal)(signum, handler);
 387 }
 388 #define ESAN_MAYBE_INTERCEPT_SIGNAL INTERCEPT_FUNCTION(signal)
 389 #else
 390 #error Platform not supported
 391 #define ESAN_MAYBE_INTERCEPT_SIGNAL
 392 #endif
 393
 394 #if SANITIZER_LINUX
 395 DECLARE_REAL(int, sigaction, int signum, const struct sigaction *act,
 396              struct sigaction *oldact)
 397 INTERCEPTOR(int, sigaction, int signum, const struct sigaction *act,
 398             struct sigaction *oldact) {
 399   void *ctx;
 400   COMMON_INTERCEPTOR_ENTER(ctx, sigaction, signum, act, oldact);
 401   if (!processSigaction(signum, act, oldact))
 402     return 0;
 403   else
 404     return REAL(sigaction)(signum, act, oldact);
 405 }
 406
 407 // This is required to properly use internal_sigaction.
 408 namespace __sanitizer {
 409 int real_sigaction(int signum, const void *act, void *oldact) {
 410   if (REAL(sigaction) == nullptr) {
 411     // With an instrumented allocator, this is called during interceptor init
 412     // and we need a raw syscall solution.
 413     return internal_sigaction_syscall(signum, act, oldact);
 414   }
 415   return REAL(sigaction)(signum, (const struct sigaction *)act,
 416                          (struct sigaction *)oldact);
 417 }
 418 } // namespace __sanitizer
 419
 420 #define ESAN_MAYBE_INTERCEPT_SIGACTION INTERCEPT_FUNCTION(sigaction)
 421 #else
 422 #error Platform not supported
 423 #define ESAN_MAYBE_INTERCEPT_SIGACTION
 424 #endif
 425
 426 #if SANITIZER_LINUX
 427 INTERCEPTOR(int, sigprocmask, int how, __sanitizer_sigset_t *set,
 428             __sanitizer_sigset_t *oldset) {
 429   void *ctx;
 430   COMMON_INTERCEPTOR_ENTER(ctx, sigprocmask, how, set, oldset);
 431   int res = 0;
 432   if (processSigprocmask(how, set, oldset))
 433     res = REAL(sigprocmask)(how, set, oldset);
 434   if (!res && oldset)
 435     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, oldset, sizeof(*oldset));
 436   return res;
 437 }
 438 #define ESAN_MAYBE_INTERCEPT_SIGPROCMASK INTERCEPT_FUNCTION(sigprocmask)
 439 #else
 440 #define ESAN_MAYBE_INTERCEPT_SIGPROCMASK
 441 #endif
 442
 443 #if !SANITIZER_WINDOWS
 444 INTERCEPTOR(int, pthread_sigmask, int how, __sanitizer_sigset_t *set,
 445             __sanitizer_sigset_t *oldset) {
 446   void *ctx;
 447   COMMON_INTERCEPTOR_ENTER(ctx, pthread_sigmask, how, set, oldset);
 448   int res = 0;
 449   if (processSigprocmask(how, set, oldset))
 450     res = REAL(sigprocmask)(how, set, oldset);
 451   if (!res && oldset)
 452     COMMON_INTERCEPTOR_WRITE_RANGE(ctx, oldset, sizeof(*oldset));
 453   return res;
 454 }
 455 #define ESAN_MAYBE_INTERCEPT_PTHREAD_SIGMASK INTERCEPT_FUNCTION(pthread_sigmask)
 456 #else
 457 #define ESAN_MAYBE_INTERCEPT_PTHREAD_SIGMASK
 458 #endif
 459
 460 //===----------------------------------------------------------------------===//
 461 // Malloc interceptors
 462 //===----------------------------------------------------------------------===//
 463
 464 static const uptr early_alloc_buf_size = 4096;
 465 static uptr allocated_bytes;
 466 static char early_alloc_buf[early_alloc_buf_size];
 467
 468 static bool isInEarlyAllocBuf(const void *ptr) {
 469   return ((uptr)ptr >= (uptr)early_alloc_buf &&
 470           ((uptr)ptr - (uptr)early_alloc_buf) < sizeof(early_alloc_buf));
 471 }
 472
 473 static void *handleEarlyAlloc(uptr size) {
 474   // If esan is initialized during an interceptor (which happens with some
 475   // tcmalloc implementations that call pthread_mutex_lock), the call from
 476   // dlsym to calloc will deadlock.
 477   // dlsym may also call malloc before REAL(malloc) is retrieved from dlsym.
 478   // We work around it by using a static buffer for the early malloc/calloc
 479   // requests.
 480   // This solution will also allow us to deliberately intercept malloc & family
 481   // in the future (to perform tool actions on each allocation, without
 482   // replacing the allocator), as it also solves the problem of intercepting
 483   // calloc when it will itself be called before its REAL pointer is
 484   // initialized.
 485   // We do not handle multiple threads here.  This only happens at process init
 486   // time, and while it's possible for a shared library to create early threads
 487   // that race here, we consider that to be a corner case extreme enough that
 488   // it's not worth the effort to handle.
 489   void *mem = (void *)&early_alloc_buf[allocated_bytes];
 490   allocated_bytes += size;
 491   CHECK_LT(allocated_bytes, early_alloc_buf_size);
 492   return mem;
 493 }
 494
 495 INTERCEPTOR(void*, calloc, uptr size, uptr n) {
 496   if (EsanDuringInit && REAL(calloc) == nullptr)
 497     return handleEarlyAlloc(size * n);
 498   void *ctx;
 499   COMMON_INTERCEPTOR_ENTER(ctx, calloc, size, n);
 500   void *res = REAL(calloc)(size, n);
 501   // The memory is zeroed and thus is all written.
 502   COMMON_INTERCEPTOR_WRITE_RANGE(nullptr, (uptr)res, size * n);
 503   return res;
 504 }
 505
 506 INTERCEPTOR(void*, malloc, uptr size) {
 507   if (EsanDuringInit && REAL(malloc) == nullptr)
 508     return handleEarlyAlloc(size);
 509   void *ctx;
 510   COMMON_INTERCEPTOR_ENTER(ctx, malloc, size);
 511   return REAL(malloc)(size);
 512 }
 513
 514 INTERCEPTOR(void, free, void *p) {
 515   void *ctx;
 516   // There are only a few early allocation requests, so we simply skip the free.
 517   if (isInEarlyAllocBuf(p))
 518     return;
 519   COMMON_INTERCEPTOR_ENTER(ctx, free, p);
 520   REAL(free)(p);
 521 }
 522
 523 namespace __esan {
 524
 525 void initializeInterceptors() {
 526   InitializeCommonInterceptors();
 527
 528   INTERCEPT_FUNCTION(strcpy); // NOLINT
 529   INTERCEPT_FUNCTION(strncpy);
 530
 531   INTERCEPT_FUNCTION(open);
 532   ESAN_MAYBE_INTERCEPT_OPEN64;
 533   INTERCEPT_FUNCTION(creat);
 534   ESAN_MAYBE_INTERCEPT_CREAT64;
 535   INTERCEPT_FUNCTION(unlink);
 536   INTERCEPT_FUNCTION(fread);
 537   INTERCEPT_FUNCTION(fwrite);
 538   INTERCEPT_FUNCTION(puts);
 539   INTERCEPT_FUNCTION(rmdir);
 540
 541   INTERCEPT_FUNCTION(mmap);
 542   ESAN_MAYBE_INTERCEPT_MMAP64;
 543
 544   ESAN_MAYBE_INTERCEPT_SIGNAL;
 545   ESAN_MAYBE_INTERCEPT_SIGACTION;
 546   ESAN_MAYBE_INTERCEPT_SIGPROCMASK;
 547   ESAN_MAYBE_INTERCEPT_PTHREAD_SIGMASK;
 548
 549   INTERCEPT_FUNCTION(calloc);
 550   INTERCEPT_FUNCTION(malloc);
 551   INTERCEPT_FUNCTION(free);
 552
 553   // TODO(bruening): intercept routines that other sanitizers intercept that
 554   // are not in the common pool or here yet, ideally by adding to the common
 555   // pool.  Examples include wcslen and bcopy.
 556
 557   // TODO(bruening): there are many more libc routines that read or write data
 558   // structures that no sanitizer is intercepting: sigaction, strtol, etc.
 559 }
 560
 561 } // namespace __esan