contrib/llvm-project/compiler-rt/lib/hwasan/hwasan_interceptors.cpp

   1 //===-- hwasan_interceptors.cpp -------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file is a part of HWAddressSanitizer.
  10 //
  11 // Interceptors for standard library functions.
  12 //
  13 // FIXME: move as many interceptors as possible into
  14 // sanitizer_common/sanitizer_common_interceptors.h
  15 //===----------------------------------------------------------------------===//
  16
  17 #include "interception/interception.h"
  18 #include "hwasan.h"
  19 #include "hwasan_allocator.h"
  20 #include "hwasan_mapping.h"
  21 #include "hwasan_thread.h"
  22 #include "hwasan_poisoning.h"
  23 #include "hwasan_report.h"
  24 #include "sanitizer_common/sanitizer_platform_limits_posix.h"
  25 #include "sanitizer_common/sanitizer_allocator.h"
  26 #include "sanitizer_common/sanitizer_allocator_interface.h"
  27 #include "sanitizer_common/sanitizer_allocator_internal.h"
  28 #include "sanitizer_common/sanitizer_atomic.h"
  29 #include "sanitizer_common/sanitizer_common.h"
  30 #include "sanitizer_common/sanitizer_errno.h"
  31 #include "sanitizer_common/sanitizer_stackdepot.h"
  32 #include "sanitizer_common/sanitizer_libc.h"
  33 #include "sanitizer_common/sanitizer_linux.h"
  34 #include "sanitizer_common/sanitizer_tls_get_addr.h"
  35
  36 #include <stdarg.h>
  37 // ACHTUNG! No other system header includes in this file.
  38 // Ideally, we should get rid of stdarg.h as well.
  39
  40 using namespace __hwasan;
  41
  42 using __sanitizer::memory_order;
  43 using __sanitizer::atomic_load;
  44 using __sanitizer::atomic_store;
  45 using __sanitizer::atomic_uintptr_t;
  46
  47 static uptr allocated_for_dlsym;
  48 static const uptr kDlsymAllocPoolSize = 1024;
  49 static uptr alloc_memory_for_dlsym[kDlsymAllocPoolSize];
  50
  51 static bool IsInDlsymAllocPool(const void *ptr) {
  52   uptr off = (uptr)ptr - (uptr)alloc_memory_for_dlsym;
  53   return off < sizeof(alloc_memory_for_dlsym);
  54 }
  55
  56 static void *AllocateFromLocalPool(uptr size_in_bytes) {
  57   uptr size_in_words = RoundUpTo(size_in_bytes, kWordSize) / kWordSize;
  58   void *mem = (void *)&alloc_memory_for_dlsym[allocated_for_dlsym];
  59   allocated_for_dlsym += size_in_words;
  60   CHECK_LT(allocated_for_dlsym, kDlsymAllocPoolSize);
  61   return mem;
  62 }
  63
  64 #define ENSURE_HWASAN_INITED() do { \
  65   CHECK(!hwasan_init_is_running); \
  66   if (!hwasan_inited) { \
  67     __hwasan_init(); \
  68   } \
  69 } while (0)
  70
  71
  72 int __sanitizer_posix_memalign(void **memptr, uptr alignment, uptr size) {
  73   GET_MALLOC_STACK_TRACE;
  74   CHECK_NE(memptr, 0);
  75   int res = hwasan_posix_memalign(memptr, alignment, size, &stack);
  76   return res;
  77 }
  78
  79 void * __sanitizer_memalign(uptr alignment, uptr size) {
  80   GET_MALLOC_STACK_TRACE;
  81   return hwasan_memalign(alignment, size, &stack);
  82 }
  83
  84 void * __sanitizer_aligned_alloc(uptr alignment, uptr size) {
  85   GET_MALLOC_STACK_TRACE;
  86   return hwasan_aligned_alloc(alignment, size, &stack);
  87 }
  88
  89 void * __sanitizer___libc_memalign(uptr alignment, uptr size) {
  90   GET_MALLOC_STACK_TRACE;
  91   void *ptr = hwasan_memalign(alignment, size, &stack);
  92   if (ptr)
  93     DTLS_on_libc_memalign(ptr, size);
  94   return ptr;
  95 }
  96
  97 void * __sanitizer_valloc(uptr size) {
  98   GET_MALLOC_STACK_TRACE;
  99   return hwasan_valloc(size, &stack);
 100 }
 101
 102 void * __sanitizer_pvalloc(uptr size) {
 103   GET_MALLOC_STACK_TRACE;
 104   return hwasan_pvalloc(size, &stack);
 105 }
 106
 107 void __sanitizer_free(void *ptr) {
 108   GET_MALLOC_STACK_TRACE;
 109   if (!ptr || UNLIKELY(IsInDlsymAllocPool(ptr))) return;
 110   hwasan_free(ptr, &stack);
 111 }
 112
 113 void __sanitizer_cfree(void *ptr) {
 114   GET_MALLOC_STACK_TRACE;
 115   if (!ptr || UNLIKELY(IsInDlsymAllocPool(ptr))) return;
 116   hwasan_free(ptr, &stack);
 117 }
 118
 119 uptr __sanitizer_malloc_usable_size(const void *ptr) {
 120   return __sanitizer_get_allocated_size(ptr);
 121 }
 122
 123 struct __sanitizer_struct_mallinfo __sanitizer_mallinfo() {
 124   __sanitizer_struct_mallinfo sret;
 125   internal_memset(&sret, 0, sizeof(sret));
 126   return sret;
 127 }
 128
 129 int __sanitizer_mallopt(int cmd, int value) {
 130   return 0;
 131 }
 132
 133 void __sanitizer_malloc_stats(void) {
 134   // FIXME: implement, but don't call REAL(malloc_stats)!
 135 }
 136
 137 void * __sanitizer_calloc(uptr nmemb, uptr size) {
 138   GET_MALLOC_STACK_TRACE;
 139   if (UNLIKELY(!hwasan_inited))
 140     // Hack: dlsym calls calloc before REAL(calloc) is retrieved from dlsym.
 141     return AllocateFromLocalPool(nmemb * size);
 142   return hwasan_calloc(nmemb, size, &stack);
 143 }
 144
 145 void * __sanitizer_realloc(void *ptr, uptr size) {
 146   GET_MALLOC_STACK_TRACE;
 147   if (UNLIKELY(IsInDlsymAllocPool(ptr))) {
 148     uptr offset = (uptr)ptr - (uptr)alloc_memory_for_dlsym;
 149     uptr copy_size = Min(size, kDlsymAllocPoolSize - offset);
 150     void *new_ptr;
 151     if (UNLIKELY(!hwasan_inited)) {
 152       new_ptr = AllocateFromLocalPool(copy_size);
 153     } else {
 154       copy_size = size;
 155       new_ptr = hwasan_malloc(copy_size, &stack);
 156     }
 157     internal_memcpy(new_ptr, ptr, copy_size);
 158     return new_ptr;
 159   }
 160   return hwasan_realloc(ptr, size, &stack);
 161 }
 162
 163 void * __sanitizer_reallocarray(void *ptr, uptr nmemb, uptr size) {
 164   GET_MALLOC_STACK_TRACE;
 165   return hwasan_reallocarray(ptr, nmemb, size, &stack);
 166 }
 167
 168 void * __sanitizer_malloc(uptr size) {
 169   GET_MALLOC_STACK_TRACE;
 170   if (UNLIKELY(!hwasan_init_is_running))
 171     ENSURE_HWASAN_INITED();
 172   if (UNLIKELY(!hwasan_inited))
 173     // Hack: dlsym calls malloc before REAL(malloc) is retrieved from dlsym.
 174     return AllocateFromLocalPool(size);
 175   return hwasan_malloc(size, &stack);
 176 }
 177
 178 #if HWASAN_WITH_INTERCEPTORS
 179 #define INTERCEPTOR_ALIAS(RET, FN, ARGS...)                                  \
 180   extern "C" SANITIZER_INTERFACE_ATTRIBUTE RET WRAP(FN)(ARGS)                \
 181       ALIAS("__sanitizer_" #FN);                                             \
 182   extern "C" SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE RET FN(  \
 183       ARGS) ALIAS("__sanitizer_" #FN)
 184
 185 INTERCEPTOR_ALIAS(int, posix_memalign, void **memptr, SIZE_T alignment,
 186                   SIZE_T size);
 187 INTERCEPTOR_ALIAS(void *, aligned_alloc, SIZE_T alignment, SIZE_T size);
 188 INTERCEPTOR_ALIAS(void *, __libc_memalign, SIZE_T alignment, SIZE_T size);
 189 INTERCEPTOR_ALIAS(void *, valloc, SIZE_T size);
 190 INTERCEPTOR_ALIAS(void, free, void *ptr);
 191 INTERCEPTOR_ALIAS(uptr, malloc_usable_size, const void *ptr);
 192 INTERCEPTOR_ALIAS(void *, calloc, SIZE_T nmemb, SIZE_T size);
 193 INTERCEPTOR_ALIAS(void *, realloc, void *ptr, SIZE_T size);
 194 INTERCEPTOR_ALIAS(void *, reallocarray, void *ptr, SIZE_T nmemb, SIZE_T size);
 195 INTERCEPTOR_ALIAS(void *, malloc, SIZE_T size);
 196
 197 #if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
 198 INTERCEPTOR_ALIAS(void *, memalign, SIZE_T alignment, SIZE_T size);
 199 INTERCEPTOR_ALIAS(void *, pvalloc, SIZE_T size);
 200 INTERCEPTOR_ALIAS(void, cfree, void *ptr);
 201 INTERCEPTOR_ALIAS(__sanitizer_struct_mallinfo, mallinfo);
 202 INTERCEPTOR_ALIAS(int, mallopt, int cmd, int value);
 203 INTERCEPTOR_ALIAS(void, malloc_stats, void);
 204 #endif
 205 #endif // HWASAN_WITH_INTERCEPTORS
 206
 207
 208 #if HWASAN_WITH_INTERCEPTORS && !defined(__aarch64__)
 209 INTERCEPTOR(int, pthread_create, void *th, void *attr,
 210             void *(*callback)(void *), void *param) {
 211   ScopedTaggingDisabler disabler;
 212   int res = REAL(pthread_create)(UntagPtr(th), UntagPtr(attr),
 213                                  callback, param);
 214   return res;
 215 }
 216 #endif
 217
 218 #if HWASAN_WITH_INTERCEPTORS
 219 DEFINE_REAL(int, vfork)
 220 DECLARE_EXTERN_INTERCEPTOR_AND_WRAPPER(int, vfork)
 221 #endif
 222
 223 static void BeforeFork() {
 224   StackDepotLockAll();
 225 }
 226
 227 static void AfterFork() {
 228   StackDepotUnlockAll();
 229 }
 230
 231 INTERCEPTOR(int, fork, void) {
 232   ENSURE_HWASAN_INITED();
 233   BeforeFork();
 234   int pid = REAL(fork)();
 235   AfterFork();
 236   return pid;
 237 }
 238
 239 namespace __hwasan {
 240
 241 int OnExit() {
 242   // FIXME: ask frontend whether we need to return failure.
 243   return 0;
 244 }
 245
 246 } // namespace __hwasan
 247
 248 namespace __hwasan {
 249
 250 void InitializeInterceptors() {
 251   static int inited = 0;
 252   CHECK_EQ(inited, 0);
 253
 254   INTERCEPT_FUNCTION(fork);
 255
 256 #if HWASAN_WITH_INTERCEPTORS
 257 #if defined(__linux__)
 258   INTERCEPT_FUNCTION(vfork);
 259 #endif  // __linux__
 260 #if !defined(__aarch64__)
 261   INTERCEPT_FUNCTION(pthread_create);
 262 #endif  // __aarch64__
 263   INTERCEPT_FUNCTION(realloc);
 264   INTERCEPT_FUNCTION(free);
 265 #endif
 266
 267   inited = 1;
 268 }
 269 } // namespace __hwasan