1 files changed, 349 insertions, 0 deletions
diff --git a/lib/msan/msan_allocator.cpp b/lib/msan/msan_allocator.cpp
new file mode 100644
index 000000000000..6aa4e2738075
--- /dev/null
+++ b/lib/msan/msan_allocator.cpp
@@ -0,0 +1,349 @@
+//===-- msan_allocator.cpp -------------------------- ---------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of MemorySanitizer.
+//
+// MemorySanitizer allocator.
+//===----------------------------------------------------------------------===//
+
+#include "sanitizer_common/sanitizer_allocator.h"
+#include "sanitizer_common/sanitizer_allocator_checks.h"
+#include "sanitizer_common/sanitizer_allocator_interface.h"
+#include "sanitizer_common/sanitizer_allocator_report.h"
+#include "sanitizer_common/sanitizer_errno.h"
+#include "msan.h"
+#include "msan_allocator.h"
+#include "msan_origin.h"
+#include "msan_thread.h"
+#include "msan_poisoning.h"
+
+namespace __msan {
+
+struct Metadata {
+  uptr requested_size;
+};
+
+struct MsanMapUnmapCallback {
+  void OnMap(uptr p, uptr size) const {}
+  void OnUnmap(uptr p, uptr size) const {
+    __msan_unpoison((void *)p, size);
+
+    // We are about to unmap a chunk of user memory.
+    // Mark the corresponding shadow memory as not needed.
+    uptr shadow_p = MEM_TO_SHADOW(p);
+    ReleaseMemoryPagesToOS(shadow_p, shadow_p + size);
+    if (__msan_get_track_origins()) {
+      uptr origin_p = MEM_TO_ORIGIN(p);
+      ReleaseMemoryPagesToOS(origin_p, origin_p + size);
+    }
+  }
+};
+
+#if defined(__mips64)
+static const uptr kMaxAllowedMallocSize = 2UL << 30;
+
+struct AP32 {
+  static const uptr kSpaceBeg = 0;
+  static const u64 kSpaceSize = SANITIZER_MMAP_RANGE_SIZE;
+  static const uptr kMetadataSize = sizeof(Metadata);
+  typedef __sanitizer::CompactSizeClassMap SizeClassMap;
+  static const uptr kRegionSizeLog = 20;
+  using AddressSpaceView = LocalAddressSpaceView;
+  typedef MsanMapUnmapCallback MapUnmapCallback;
+  static const uptr kFlags = 0;
+};
+typedef SizeClassAllocator32<AP32> PrimaryAllocator;
+#elif defined(__x86_64__)
+#if SANITIZER_NETBSD || \
+    (SANITIZER_LINUX && !defined(MSAN_LINUX_X86_64_OLD_MAPPING))
+static const uptr kAllocatorSpace = 0x700000000000ULL;
+#else
+static const uptr kAllocatorSpace = 0x600000000000ULL;
+#endif
+static const uptr kMaxAllowedMallocSize = 8UL << 30;
+
+struct AP64 {  // Allocator64 parameters. Deliberately using a short name.
+  static const uptr kSpaceBeg = kAllocatorSpace;
+  static const uptr kSpaceSize = 0x40000000000;  // 4T.
+  static const uptr kMetadataSize = sizeof(Metadata);
+  typedef DefaultSizeClassMap SizeClassMap;
+  typedef MsanMapUnmapCallback MapUnmapCallback;
+  static const uptr kFlags = 0;
+  using AddressSpaceView = LocalAddressSpaceView;
+};
+
+typedef SizeClassAllocator64<AP64> PrimaryAllocator;
+
+#elif defined(__powerpc64__)
+static const uptr kMaxAllowedMallocSize = 2UL << 30;  // 2G
+
+struct AP64 {  // Allocator64 parameters. Deliberately using a short name.
+  static const uptr kSpaceBeg = 0x300000000000;
+  static const uptr kSpaceSize = 0x020000000000;  // 2T.
+  static const uptr kMetadataSize = sizeof(Metadata);
+  typedef DefaultSizeClassMap SizeClassMap;
+  typedef MsanMapUnmapCallback MapUnmapCallback;
+  static const uptr kFlags = 0;
+  using AddressSpaceView = LocalAddressSpaceView;
+};
+
+typedef SizeClassAllocator64<AP64> PrimaryAllocator;
+#elif defined(__aarch64__)
+static const uptr kMaxAllowedMallocSize = 2UL << 30;  // 2G
+
+struct AP32 {
+  static const uptr kSpaceBeg = 0;
+  static const u64 kSpaceSize = SANITIZER_MMAP_RANGE_SIZE;
+  static const uptr kMetadataSize = sizeof(Metadata);
+  typedef __sanitizer::CompactSizeClassMap SizeClassMap;
+  static const uptr kRegionSizeLog = 20;
+  using AddressSpaceView = LocalAddressSpaceView;
+  typedef MsanMapUnmapCallback MapUnmapCallback;
+  static const uptr kFlags = 0;
+};
+typedef SizeClassAllocator32<AP32> PrimaryAllocator;
+#endif
+typedef CombinedAllocator<PrimaryAllocator> Allocator;
+typedef Allocator::AllocatorCache AllocatorCache;
+
+static Allocator allocator;
+static AllocatorCache fallback_allocator_cache;
+static StaticSpinMutex fallback_mutex;
+
+void MsanAllocatorInit() {
+  SetAllocatorMayReturnNull(common_flags()->allocator_may_return_null);
+  allocator.Init(common_flags()->allocator_release_to_os_interval_ms);
+}
+
+AllocatorCache *GetAllocatorCache(MsanThreadLocalMallocStorage *ms) {
+  CHECK(ms);
+  CHECK_LE(sizeof(AllocatorCache), sizeof(ms->allocator_cache));
+  return reinterpret_cast<AllocatorCache *>(ms->allocator_cache);
+}
+
+void MsanThreadLocalMallocStorage::CommitBack() {
+  allocator.SwallowCache(GetAllocatorCache(this));
+}
+
+static void *MsanAllocate(StackTrace *stack, uptr size, uptr alignment,
+                          bool zeroise) {
+  if (size > kMaxAllowedMallocSize) {
+    if (AllocatorMayReturnNull()) {
+      Report("WARNING: MemorySanitizer failed to allocate 0x%zx bytes\n", size);
+      return nullptr;
+    }
+    ReportAllocationSizeTooBig(size, kMaxAllowedMallocSize, stack);
+  }
+  MsanThread *t = GetCurrentThread();
+  void *allocated;
+  if (t) {
+    AllocatorCache *cache = GetAllocatorCache(&t->malloc_storage());
+    allocated = allocator.Allocate(cache, size, alignment);
+  } else {
+    SpinMutexLock l(&fallback_mutex);
+    AllocatorCache *cache = &fallback_allocator_cache;
+    allocated = allocator.Allocate(cache, size, alignment);
+  }
+  if (UNLIKELY(!allocated)) {
+    SetAllocatorOutOfMemory();
+    if (AllocatorMayReturnNull())
+      return nullptr;
+    ReportOutOfMemory(size, stack);
+  }
+  Metadata *meta =
+      reinterpret_cast<Metadata *>(allocator.GetMetaData(allocated));
+  meta->requested_size = size;
+  if (zeroise) {
+    __msan_clear_and_unpoison(allocated, size);
+  } else if (flags()->poison_in_malloc) {
+    __msan_poison(allocated, size);
+    if (__msan_get_track_origins()) {
+      stack->tag = StackTrace::TAG_ALLOC;
+      Origin o = Origin::CreateHeapOrigin(stack);
+      __msan_set_origin(allocated, size, o.raw_id());
+    }
+  }
+  MSAN_MALLOC_HOOK(allocated, size);
+  return allocated;
+}
+
+void MsanDeallocate(StackTrace *stack, void *p) {
+  CHECK(p);
+  MSAN_FREE_HOOK(p);
+  Metadata *meta = reinterpret_cast<Metadata *>(allocator.GetMetaData(p));
+  uptr size = meta->requested_size;
+  meta->requested_size = 0;
+  // This memory will not be reused by anyone else, so we are free to keep it
+  // poisoned.
+  if (flags()->poison_in_free) {
+    __msan_poison(p, size);
+    if (__msan_get_track_origins()) {
+      stack->tag = StackTrace::TAG_DEALLOC;
+      Origin o = Origin::CreateHeapOrigin(stack);
+      __msan_set_origin(p, size, o.raw_id());
+    }
+  }
+  MsanThread *t = GetCurrentThread();
+  if (t) {
+    AllocatorCache *cache = GetAllocatorCache(&t->malloc_storage());
+    allocator.Deallocate(cache, p);
+  } else {
+    SpinMutexLock l(&fallback_mutex);
+    AllocatorCache *cache = &fallback_allocator_cache;
+    allocator.Deallocate(cache, p);
+  }
+}
+
+void *MsanReallocate(StackTrace *stack, void *old_p, uptr new_size,
+                     uptr alignment) {
+  Metadata *meta = reinterpret_cast<Metadata*>(allocator.GetMetaData(old_p));
+  uptr old_size = meta->requested_size;
+  uptr actually_allocated_size = allocator.GetActuallyAllocatedSize(old_p);
+  if (new_size <= actually_allocated_size) {
+    // We are not reallocating here.
+    meta->requested_size = new_size;
+    if (new_size > old_size) {
+      if (flags()->poison_in_malloc) {
+        stack->tag = StackTrace::TAG_ALLOC;
+        PoisonMemory((char *)old_p + old_size, new_size - old_size, stack);
+      }
+    }
+    return old_p;
+  }
+  uptr memcpy_size = Min(new_size, old_size);
+  void *new_p = MsanAllocate(stack, new_size, alignment, false /*zeroise*/);
+  if (new_p) {
+    CopyMemory(new_p, old_p, memcpy_size, stack);
+    MsanDeallocate(stack, old_p);
+  }
+  return new_p;
+}
+
+void *MsanCalloc(StackTrace *stack, uptr nmemb, uptr size) {
+  if (UNLIKELY(CheckForCallocOverflow(size, nmemb))) {
+    if (AllocatorMayReturnNull())
+      return nullptr;
+    ReportCallocOverflow(nmemb, size, stack);
+  }
+  return MsanAllocate(stack, nmemb * size, sizeof(u64), true);
+}
+
+static uptr AllocationSize(const void *p) {
+  if (!p) return 0;
+  const void *beg = allocator.GetBlockBegin(p);
+  if (beg != p) return 0;
+  Metadata *b = (Metadata *)allocator.GetMetaData(p);
+  return b->requested_size;
+}
+
+void *msan_malloc(uptr size, StackTrace *stack) {
+  return SetErrnoOnNull(MsanAllocate(stack, size, sizeof(u64), false));
+}
+
+void *msan_calloc(uptr nmemb, uptr size, StackTrace *stack) {
+  return SetErrnoOnNull(MsanCalloc(stack, nmemb, size));
+}
+
+void *msan_realloc(void *ptr, uptr size, StackTrace *stack) {
+  if (!ptr)
+    return SetErrnoOnNull(MsanAllocate(stack, size, sizeof(u64), false));
+  if (size == 0) {
+    MsanDeallocate(stack, ptr);
+    return nullptr;
+  }
+  return SetErrnoOnNull(MsanReallocate(stack, ptr, size, sizeof(u64)));
+}
+
+void *msan_reallocarray(void *ptr, uptr nmemb, uptr size, StackTrace *stack) {
+  if (UNLIKELY(CheckForCallocOverflow(size, nmemb))) {
+    errno = errno_ENOMEM;
+    if (AllocatorMayReturnNull())
+      return nullptr;
+    ReportReallocArrayOverflow(nmemb, size, stack);
+  }
+  return msan_realloc(ptr, nmemb * size, stack);
+}
+
+void *msan_valloc(uptr size, StackTrace *stack) {
+  return SetErrnoOnNull(MsanAllocate(stack, size, GetPageSizeCached(), false));
+}
+
+void *msan_pvalloc(uptr size, StackTrace *stack) {
+  uptr PageSize = GetPageSizeCached();
+  if (UNLIKELY(CheckForPvallocOverflow(size, PageSize))) {
+    errno = errno_ENOMEM;
+    if (AllocatorMayReturnNull())
+      return nullptr;
+    ReportPvallocOverflow(size, stack);
+  }
+  // pvalloc(0) should allocate one page.
+  size = size ? RoundUpTo(size, PageSize) : PageSize;
+  return SetErrnoOnNull(MsanAllocate(stack, size, PageSize, false));
+}
+
+void *msan_aligned_alloc(uptr alignment, uptr size, StackTrace *stack) {
+  if (UNLIKELY(!CheckAlignedAllocAlignmentAndSize(alignment, size))) {
+    errno = errno_EINVAL;
+    if (AllocatorMayReturnNull())
+      return nullptr;
+    ReportInvalidAlignedAllocAlignment(size, alignment, stack);
+  }
+  return SetErrnoOnNull(MsanAllocate(stack, size, alignment, false));
+}
+
+void *msan_memalign(uptr alignment, uptr size, StackTrace *stack) {
+  if (UNLIKELY(!IsPowerOfTwo(alignment))) {
+    errno = errno_EINVAL;
+    if (AllocatorMayReturnNull())
+      return nullptr;
+    ReportInvalidAllocationAlignment(alignment, stack);
+  }
+  return SetErrnoOnNull(MsanAllocate(stack, size, alignment, false));
+}
+
+int msan_posix_memalign(void **memptr, uptr alignment, uptr size,
+                        StackTrace *stack) {
+  if (UNLIKELY(!CheckPosixMemalignAlignment(alignment))) {
+    if (AllocatorMayReturnNull())
+      return errno_EINVAL;
+    ReportInvalidPosixMemalignAlignment(alignment, stack);
+  }
+  void *ptr = MsanAllocate(stack, size, alignment, false);
+  if (UNLIKELY(!ptr))
+    // OOM error is already taken care of by MsanAllocate.
+    return errno_ENOMEM;
+  CHECK(IsAligned((uptr)ptr, alignment));
+  *memptr = ptr;
+  return 0;
+}
+
+} // namespace __msan
+
+using namespace __msan;
+
+uptr __sanitizer_get_current_allocated_bytes() {
+  uptr stats[AllocatorStatCount];
+  allocator.GetStats(stats);
+  return stats[AllocatorStatAllocated];
+}
+
+uptr __sanitizer_get_heap_size() {
+  uptr stats[AllocatorStatCount];
+  allocator.GetStats(stats);
+  return stats[AllocatorStatMapped];
+}
+
+uptr __sanitizer_get_free_bytes() { return 1; }
+
+uptr __sanitizer_get_unmapped_bytes() { return 1; }
+
+uptr __sanitizer_get_estimated_allocated_size(uptr size) { return size; }
+
+int __sanitizer_get_ownership(const void *p) { return AllocationSize(p) != 0; }
+
+uptr __sanitizer_get_allocated_size(const void *p) { return AllocationSize(p); }