diff --git a/libc/bionic/gwp_asan_wrappers.cpp b/libc/bionic/gwp_asan_wrappers.cpp
new file mode 100644
index 0000000..680c5e7
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+++ b/libc/bionic/gwp_asan_wrappers.cpp
@@ -0,0 +1,263 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <platform/bionic/malloc.h>
+#include <private/bionic_malloc_dispatch.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/types.h>
+
+#include "bionic/gwp_asan_wrappers.h"
+#include "gwp_asan/guarded_pool_allocator.h"
+#include "gwp_asan/options.h"
+#include "gwp_asan/random.h"
+#include "malloc_common.h"
+
+#ifndef LIBC_STATIC
+#include "bionic/malloc_common_dynamic.h"
+#endif  // LIBC_STATIC
+
+static gwp_asan::GuardedPoolAllocator GuardedAlloc;
+static const MallocDispatch* prev_dispatch;
+
+using Options = gwp_asan::options::Options;
+
+// ============================================================================
+// Implementation of gFunctions.
+// ============================================================================
+
+// This function handles initialisation as asked for by MallocInitImpl. This
+// should always be called in a single-threaded context.
+bool gwp_asan_initialize(const MallocDispatch* dispatch, bool*, const char*) {
+  prev_dispatch = dispatch;
+
+  Options Opts;
+  Opts.Enabled = true;
+  Opts.MaxSimultaneousAllocations = 32;
+  Opts.SampleRate = 2500;
+  Opts.InstallSignalHandlers = false;
+  Opts.InstallForkHandlers = true;
+
+  GuardedAlloc.init(Opts);
+  info_log("GWP-ASan has been enabled.");
+  return true;
+}
+
+void gwp_asan_finalize() {
+}
+
+void gwp_asan_get_malloc_leak_info(uint8_t**, size_t*, size_t*, size_t*, size_t*) {
+}
+
+void gwp_asan_free_malloc_leak_info(uint8_t*) {
+}
+
+ssize_t gwp_asan_malloc_backtrace(void*, uintptr_t*, size_t) {
+  // TODO(mitchp): GWP-ASan might be able to return the backtrace for the
+  // provided address.
+  return -1;
+}
+
+bool gwp_asan_write_malloc_leak_info(FILE*) {
+  return false;
+}
+
+void* gwp_asan_gfunctions[] = {
+  (void*)gwp_asan_initialize,           (void*)gwp_asan_finalize,
+  (void*)gwp_asan_get_malloc_leak_info, (void*)gwp_asan_free_malloc_leak_info,
+  (void*)gwp_asan_malloc_backtrace,     (void*)gwp_asan_write_malloc_leak_info,
+};
+
+// ============================================================================
+// Implementation of GWP-ASan malloc wrappers.
+// ============================================================================
+
+void* gwp_asan_calloc(size_t n_elements, size_t elem_size) {
+  if (__predict_false(GuardedAlloc.shouldSample())) {
+    size_t bytes;
+    if (!__builtin_mul_overflow(n_elements, elem_size, &bytes)) {
+      if (void* result = GuardedAlloc.allocate(bytes)) {
+        return result;
+      }
+    }
+  }
+  return prev_dispatch->calloc(n_elements, elem_size);
+}
+
+void gwp_asan_free(void* mem) {
+  if (__predict_false(GuardedAlloc.pointerIsMine(mem))) {
+    GuardedAlloc.deallocate(mem);
+    return;
+  }
+  prev_dispatch->free(mem);
+}
+
+void* gwp_asan_malloc(size_t bytes) {
+  if (__predict_false(GuardedAlloc.shouldSample())) {
+    if (void* result = GuardedAlloc.allocate(bytes)) {
+      return result;
+    }
+  }
+  return prev_dispatch->malloc(bytes);
+}
+
+size_t gwp_asan_malloc_usable_size(const void* mem) {
+  if (__predict_false(GuardedAlloc.pointerIsMine(mem))) {
+    return GuardedAlloc.getSize(mem);
+  }
+  return prev_dispatch->malloc_usable_size(mem);
+}
+
+void* gwp_asan_realloc(void* old_mem, size_t bytes) {
+  if (__predict_false(GuardedAlloc.pointerIsMine(old_mem))) {
+    size_t old_size = GuardedAlloc.getSize(old_mem);
+    void* new_ptr = gwp_asan_malloc(bytes);
+    if (new_ptr) memcpy(new_ptr, old_mem, (bytes < old_size) ? bytes : old_size);
+    GuardedAlloc.deallocate(old_mem);
+    return new_ptr;
+  }
+  return prev_dispatch->realloc(old_mem, bytes);
+}
+
+int gwp_asan_malloc_iterate(uintptr_t base, size_t size,
+                            void (*callback)(uintptr_t base, size_t size, void* arg), void* arg) {
+  if (__predict_false(GuardedAlloc.pointerIsMine(reinterpret_cast<void*>(base)))) {
+    // TODO(mitchp): GPA::iterate() returns void, but should return int.
+    // TODO(mitchp): GPA::iterate() should take uintptr_t, not void*.
+    GuardedAlloc.iterate(reinterpret_cast<void*>(base), size, callback, arg);
+    return 0;
+  }
+  return prev_dispatch->malloc_iterate(base, size, callback, arg);
+}
+
+void gwp_asan_malloc_disable() {
+  GuardedAlloc.disable();
+  prev_dispatch->malloc_disable();
+}
+
+void gwp_asan_malloc_enable() {
+  GuardedAlloc.enable();
+  prev_dispatch->malloc_enable();
+}
+
+static const MallocDispatch gwp_asan_dispatch __attribute__((unused)) = {
+  gwp_asan_calloc,
+  gwp_asan_free,
+  Malloc(mallinfo),
+  gwp_asan_malloc,
+  gwp_asan_malloc_usable_size,
+  Malloc(memalign),
+  Malloc(posix_memalign),
+#if defined(HAVE_DEPRECATED_MALLOC_FUNCS)
+  Malloc(pvalloc),
+#endif
+  gwp_asan_realloc,
+#if defined(HAVE_DEPRECATED_MALLOC_FUNCS)
+  Malloc(valloc),
+#endif
+  gwp_asan_malloc_iterate,
+  gwp_asan_malloc_disable,
+  gwp_asan_malloc_enable,
+  Malloc(mallopt),
+  Malloc(aligned_alloc),
+  Malloc(malloc_info),
+};
+
+// TODO(mitchp): Turn on GWP-ASan here probabilistically.
+bool ShouldGwpAsanSampleProcess() {
+  return false;
+}
+
+bool MaybeInitGwpAsanFromLibc() {
+  // Never initialize the Zygote here. A Zygote chosen for sampling would also
+  // have all of its children sampled. Instead, the Zygote child will choose
+  // whether it samples or not just after the Zygote forks. For
+  // libc_scudo-preloaded executables (like mediaswcodec), the program name
+  // might not be available yet. The zygote never uses dynamic libc_scudo.
+  const char* progname = getprogname();
+  if (progname && strncmp(progname, "app_process", 11) == 0) {
+    return false;
+  }
+  return MaybeInitGwpAsan(false);
+}
+
+static bool GwpAsanInitialized = false;
+
+// Maybe initializes GWP-ASan. Called by android_mallopt() and libc's
+// initialisation. This should always be called in a single-threaded context.
+bool MaybeInitGwpAsan(bool force_init) {
+  if (GwpAsanInitialized) {
+    error_log("GWP-ASan was already initialized for this process.");
+    return false;
+  }
+
+  // If the caller hasn't forced GWP-ASan on, check whether we should sample
+  // this process.
+  if (!force_init && !ShouldGwpAsanSampleProcess()) {
+    return false;
+  }
+
+  // GWP-ASan is compatible with heapprofd/malloc_debug/malloc_hooks iff
+  // GWP-ASan was installed first. If one of these other libraries was already
+  // installed, we don't enable GWP-ASan. These libraries are normally enabled
+  // in libc_init after GWP-ASan, but if the new process is a zygote child and
+  // trying to initialize GWP-ASan through mallopt(), one of these libraries may
+  // be installed. It may be possible to change this in future by modifying the
+  // internal dispatch pointers of these libraries at this point in time, but
+  // given that they're all debug-only, we don't really mind for now.
+  if (GetDefaultDispatchTable() != nullptr) {
+    // Something else is installed.
+    return false;
+  }
+
+  // GWP-ASan's initialization is always called in a single-threaded context, so
+  // we can initialize lock-free.
+  __libc_globals.mutate([](libc_globals* globals) {
+    // Set GWP-ASan as the malloc dispatch table.
+    globals->malloc_dispatch_table = gwp_asan_dispatch;
+    atomic_store(&globals->default_dispatch_table, &gwp_asan_dispatch);
+
+    // If malloc_limit isn't installed, we can skip the default_dispatch_table
+    // lookup.
+    if (GetDispatchTable() == nullptr) {
+      atomic_store(&globals->current_dispatch_table, &gwp_asan_dispatch);
+    }
+  });
+
+#ifndef LIBC_STATIC
+  SetGlobalFunctions(gwp_asan_gfunctions);
+#endif  // LIBC_STATIC
+
+  GwpAsanInitialized = true;
+
+  gwp_asan_initialize(NativeAllocatorDispatch(), nullptr, nullptr);
+
+  return true;
+}