Pull seccomp-sandbox in via DEPS rather than using an in-tree copy...

sandbox/linux/seccomp/mmap.cc

-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "debug.h"
-#include "sandbox_impl.h"
-
-namespace playground {
-
-void* Sandbox::sandbox_mmap(void *start, size_t length, int prot, int flags,
-                          int fd, off_t offset) {
-  long long tm;
-  Debug::syscall(&tm, __NR_mmap, "Executing handler");
-  struct {
-    int       sysnum;
-    long long cookie;
-    MMap      mmap_req;
-  } __attribute__((packed)) request;
-  request.sysnum          = __NR_MMAP;
-  request.cookie          = cookie();
-  request.mmap_req.start  = start;
-  request.mmap_req.length = length;
-  request.mmap_req.prot   = prot;
-  request.mmap_req.flags  = flags;
-  request.mmap_req.fd     = fd;
-  request.mmap_req.offset = offset;
-
-  void* rc;
-  SysCalls sys;
-  if (write(sys, processFdPub(), &request, sizeof(request)) !=
-      sizeof(request) ||
-      read(sys, threadFdPub(), &rc, sizeof(rc)) != sizeof(rc)) {
-    die("Failed to forward mmap() request [sandbox]");
-  }
-  Debug::elapsed(tm, __NR_mmap);
-  return rc;
-}
-
-bool Sandbox::process_mmap(int parentMapsFd, int sandboxFd, int threadFdPub,
-                           int threadFd, SecureMem::Args* mem) {
-  // Read request
-  SysCalls sys;
-  MMap mmap_req;
-  if (read(sys, sandboxFd, &mmap_req, sizeof(mmap_req)) != sizeof(mmap_req)) {
-    die("Failed to read parameters for mmap() [process]");
-  }
-
-  if (mmap_req.flags & MAP_FIXED) {
-    // Cannot map a memory area that was part of the original memory mappings.
-    void *stop = reinterpret_cast<void *>(
-        (char *)mmap_req.start + mmap_req.length);
-    ProtectedMap::const_iterator iter = protectedMap_.lower_bound(
-        (void *)mmap_req.start);
-    if (iter != protectedMap_.begin()) {
-      --iter;
-    }
-    for (; iter != protectedMap_.end() && iter->first < stop; ++iter) {
-      if (mmap_req.start < reinterpret_cast<void *>(
-              reinterpret_cast<char *>(iter->first) + iter->second) &&
-          stop > iter->first) {
-        int rc = -EINVAL;
-        SecureMem::abandonSystemCall(threadFd, rc);
-        return false;
-      }
-    }
-  }
-
-  // All other mmap() requests are OK
-  SecureMem::sendSystemCall(threadFdPub, false, -1, mem, __NR_MMAP,
-                            mmap_req.start, mmap_req.length, mmap_req.prot,
-                            mmap_req.flags, mmap_req.fd, mmap_req.offset);
-  return true;
-}
-
-} // namespace