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

sandbox/linux/seccomp/mprotect.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 {
-
-long Sandbox::sandbox_mprotect(const void *addr, size_t len, int prot) {
-  long long tm;
-  Debug::syscall(&tm, __NR_mprotect, "Executing handler");
-  struct {
-    int       sysnum;
-    long long cookie;
-    MProtect  mprotect_req;
-  } __attribute__((packed)) request;
-  request.sysnum            = __NR_mprotect;
-  request.cookie            = cookie();
-  request.mprotect_req.addr = addr;
-  request.mprotect_req.len  = len;
-  request.mprotect_req.prot = prot;
-
-  long rc;
-  SysCalls sys;
-  if (write(sys, processFdPub(), &request, sizeof(request)) !=
-      sizeof(request) ||
-      read(sys, threadFdPub(), &rc, sizeof(rc)) != sizeof(rc)) {
-    die("Failed to forward mprotect() request [sandbox]");
-  }
-  Debug::elapsed(tm, __NR_mprotect);
-  return rc;
-}
-
-bool Sandbox::process_mprotect(int parentMapsFd, int sandboxFd,
-                               int threadFdPub, int threadFd,
-                               SecureMem::Args* mem) {
-  // Read request
-  SysCalls sys;
-  MProtect mprotect_req;
-  if (read(sys, sandboxFd, &mprotect_req, sizeof(mprotect_req)) !=
-      sizeof(mprotect_req)) {
-    die("Failed to read parameters for mprotect() [process]");
-  }
-
-  // Cannot change permissions on any memory region that was part of the
-  // original memory mappings.
-  int rc = -EINVAL;
-  void *stop = reinterpret_cast<void *>(
-      (char *)mprotect_req.addr + mprotect_req.len);
-  ProtectedMap::const_iterator iter = protectedMap_.lower_bound(
-      (void *)mprotect_req.addr);
-  if (iter != protectedMap_.begin()) {
-    --iter;
-  }
-  for (; iter != protectedMap_.end() && iter->first < stop; ++iter) {
-    if (mprotect_req.addr < reinterpret_cast<void *>(
-            reinterpret_cast<char *>(iter->first) + iter->second) &&
-        stop > iter->first) {
-      SecureMem::abandonSystemCall(threadFd, rc);
-      return false;
-    }
-  }
-
-  // Changing permissions on memory regions that were newly mapped inside of
-  // the sandbox is OK.
-  SecureMem::sendSystemCall(threadFdPub, false, -1, mem, __NR_mprotect,
-                            mprotect_req.addr,  mprotect_req.len,
-                            mprotect_req.prot);
-  return true;
-}
-
-} // namespace