libsanitizer/hwasan/hwasan_allocation_functions.cpp

   1 //===-- hwasan_allocation_functions.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 // Definitions for __sanitizer allocation functions.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15 #include "hwasan.h"
  16 #include "interception/interception.h"
  17 #include "sanitizer_common/sanitizer_allocator_dlsym.h"
  18 #include "sanitizer_common/sanitizer_allocator_interface.h"
  19 #include "sanitizer_common/sanitizer_mallinfo.h"
  20 #include "sanitizer_common/sanitizer_tls_get_addr.h"
  21
  22 using namespace __hwasan;
  23
  24 struct DlsymAlloc : public DlSymAllocator<DlsymAlloc> {
  25   static bool UseImpl() { return !hwasan_inited; }
  26   static void OnAllocate(const void *ptr, uptr size) {
  27 #  if CAN_SANITIZE_LEAKS
  28     // Suppress leaks from dlerror(). Previously dlsym hack on global array was
  29     // used by leak sanitizer as a root region.
  30     __lsan_register_root_region(ptr, size);
  31 #  endif
  32   }
  33   static void OnFree(const void *ptr, uptr size) {
  34 #  if CAN_SANITIZE_LEAKS
  35     __lsan_unregister_root_region(ptr, size);
  36 #  endif
  37   }
  38 };
  39
  40 extern "C" {
  41
  42 SANITIZER_INTERFACE_ATTRIBUTE
  43 int __sanitizer_posix_memalign(void **memptr, uptr alignment, uptr size) {
  44   GET_MALLOC_STACK_TRACE;
  45   CHECK_NE(memptr, 0);
  46   int res = hwasan_posix_memalign(memptr, alignment, size, &stack);
  47   return res;
  48 }
  49
  50 SANITIZER_INTERFACE_ATTRIBUTE
  51 void *__sanitizer_memalign(uptr alignment, uptr size) {
  52   GET_MALLOC_STACK_TRACE;
  53   return hwasan_memalign(alignment, size, &stack);
  54 }
  55
  56 SANITIZER_INTERFACE_ATTRIBUTE
  57 void *__sanitizer_aligned_alloc(uptr alignment, uptr size) {
  58   GET_MALLOC_STACK_TRACE;
  59   return hwasan_aligned_alloc(alignment, size, &stack);
  60 }
  61
  62 SANITIZER_INTERFACE_ATTRIBUTE
  63 void *__sanitizer___libc_memalign(uptr alignment, uptr size) {
  64   GET_MALLOC_STACK_TRACE;
  65   void *ptr = hwasan_memalign(alignment, size, &stack);
  66   if (ptr)
  67     DTLS_on_libc_memalign(ptr, size);
  68   return ptr;
  69 }
  70
  71 SANITIZER_INTERFACE_ATTRIBUTE
  72 void *__sanitizer_valloc(uptr size) {
  73   GET_MALLOC_STACK_TRACE;
  74   return hwasan_valloc(size, &stack);
  75 }
  76
  77 SANITIZER_INTERFACE_ATTRIBUTE
  78 void *__sanitizer_pvalloc(uptr size) {
  79   GET_MALLOC_STACK_TRACE;
  80   return hwasan_pvalloc(size, &stack);
  81 }
  82
  83 SANITIZER_INTERFACE_ATTRIBUTE
  84 void __sanitizer_free(void *ptr) {
  85   if (!ptr)
  86     return;
  87   if (DlsymAlloc::PointerIsMine(ptr))
  88     return DlsymAlloc::Free(ptr);
  89   GET_MALLOC_STACK_TRACE;
  90   hwasan_free(ptr, &stack);
  91 }
  92
  93 SANITIZER_INTERFACE_ATTRIBUTE
  94 void __sanitizer_cfree(void *ptr) {
  95   if (!ptr)
  96     return;
  97   if (DlsymAlloc::PointerIsMine(ptr))
  98     return DlsymAlloc::Free(ptr);
  99   GET_MALLOC_STACK_TRACE;
 100   hwasan_free(ptr, &stack);
 101 }
 102
 103 SANITIZER_INTERFACE_ATTRIBUTE
 104 uptr __sanitizer_malloc_usable_size(const void *ptr) {
 105   return __sanitizer_get_allocated_size(ptr);
 106 }
 107
 108 SANITIZER_INTERFACE_ATTRIBUTE
 109 struct __sanitizer_struct_mallinfo __sanitizer_mallinfo() {
 110   __sanitizer_struct_mallinfo sret;
 111   internal_memset(&sret, 0, sizeof(sret));
 112   return sret;
 113 }
 114
 115 SANITIZER_INTERFACE_ATTRIBUTE
 116 int __sanitizer_mallopt(int cmd, int value) { return 0; }
 117
 118 SANITIZER_INTERFACE_ATTRIBUTE
 119 void __sanitizer_malloc_stats(void) {
 120   // FIXME: implement, but don't call REAL(malloc_stats)!
 121 }
 122
 123 SANITIZER_INTERFACE_ATTRIBUTE
 124 void *__sanitizer_calloc(uptr nmemb, uptr size) {
 125   if (DlsymAlloc::Use())
 126     return DlsymAlloc::Callocate(nmemb, size);
 127   GET_MALLOC_STACK_TRACE;
 128   return hwasan_calloc(nmemb, size, &stack);
 129 }
 130
 131 SANITIZER_INTERFACE_ATTRIBUTE
 132 void *__sanitizer_realloc(void *ptr, uptr size) {
 133   if (DlsymAlloc::Use() || DlsymAlloc::PointerIsMine(ptr))
 134     return DlsymAlloc::Realloc(ptr, size);
 135   GET_MALLOC_STACK_TRACE;
 136   return hwasan_realloc(ptr, size, &stack);
 137 }
 138
 139 SANITIZER_INTERFACE_ATTRIBUTE
 140 void *__sanitizer_reallocarray(void *ptr, uptr nmemb, uptr size) {
 141   GET_MALLOC_STACK_TRACE;
 142   return hwasan_reallocarray(ptr, nmemb, size, &stack);
 143 }
 144
 145 SANITIZER_INTERFACE_ATTRIBUTE
 146 void *__sanitizer_malloc(uptr size) {
 147   if (UNLIKELY(!hwasan_init_is_running))
 148     ENSURE_HWASAN_INITED();
 149   if (DlsymAlloc::Use())
 150     return DlsymAlloc::Allocate(size);
 151   GET_MALLOC_STACK_TRACE;
 152   return hwasan_malloc(size, &stack);
 153 }
 154
 155 }  // extern "C"
 156
 157 #if HWASAN_WITH_INTERCEPTORS || SANITIZER_FUCHSIA
 158 #if SANITIZER_FUCHSIA
 159 // Fuchsia does not use WRAP/wrappers used for the interceptor infrastructure.
 160 #  define INTERCEPTOR_ALIAS(RET, FN, ARGS...)                                 \
 161     extern "C" SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE RET FN( \
 162         ARGS) ALIAS("__sanitizer_" #FN)
 163 #else
 164 #  define INTERCEPTOR_ALIAS(RET, FN, ARGS...)                                 \
 165     extern "C" SANITIZER_INTERFACE_ATTRIBUTE RET WRAP(FN)(ARGS)               \
 166         ALIAS("__sanitizer_" #FN);                                            \
 167     extern "C" SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE RET FN( \
 168         ARGS) ALIAS("__sanitizer_" #FN)
 169 #endif
 170
 171 INTERCEPTOR_ALIAS(int, posix_memalign, void **memptr, SIZE_T alignment,
 172                   SIZE_T size);
 173 INTERCEPTOR_ALIAS(void *, aligned_alloc, SIZE_T alignment, SIZE_T size);
 174 INTERCEPTOR_ALIAS(void *, __libc_memalign, SIZE_T alignment, SIZE_T size);
 175 INTERCEPTOR_ALIAS(void *, valloc, SIZE_T size);
 176 INTERCEPTOR_ALIAS(void, free, void *ptr);
 177 INTERCEPTOR_ALIAS(uptr, malloc_usable_size, const void *ptr);
 178 INTERCEPTOR_ALIAS(void *, calloc, SIZE_T nmemb, SIZE_T size);
 179 INTERCEPTOR_ALIAS(void *, realloc, void *ptr, SIZE_T size);
 180 INTERCEPTOR_ALIAS(void *, reallocarray, void *ptr, SIZE_T nmemb, SIZE_T size);
 181 INTERCEPTOR_ALIAS(void *, malloc, SIZE_T size);
 182
 183 #  if !SANITIZER_FREEBSD && !SANITIZER_NETBSD
 184 INTERCEPTOR_ALIAS(void *, memalign, SIZE_T alignment, SIZE_T size);
 185 INTERCEPTOR_ALIAS(void *, pvalloc, SIZE_T size);
 186 INTERCEPTOR_ALIAS(void, cfree, void *ptr);
 187 INTERCEPTOR_ALIAS(__sanitizer_struct_mallinfo, mallinfo);
 188 INTERCEPTOR_ALIAS(int, mallopt, int cmd, int value);
 189 INTERCEPTOR_ALIAS(void, malloc_stats, void);
 190 #  endif
 191 #endif  // #if HWASAN_WITH_INTERCEPTORS