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

sandbox/linux/seccomp/madvise.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_madvise(void* start, size_t length, int advice) {
-  long long tm;
-  Debug::syscall(&tm, __NR_madvise, "Executing handler");
-  struct {
-    int       sysnum;
-    long long cookie;
-    MAdvise   madvise_req;
-  } __attribute__((packed)) request;
-  request.sysnum             = __NR_madvise;
-  request.cookie             = cookie();
-  request.madvise_req.start  = start;
-  request.madvise_req.len    = length;
-  request.madvise_req.advice = advice;
-
-  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 madvise() request [sandbox]");
-  }
-  Debug::elapsed(tm, __NR_madvise);
-  return rc;
-}
-
-bool Sandbox::process_madvise(int parentMapsFd, int sandboxFd, int threadFdPub,
-                              int threadFd, SecureMem::Args* mem) {
-  // Read request
-  MAdvise madvise_req;
-  SysCalls sys;
-  if (read(sys, sandboxFd, &madvise_req, sizeof(madvise_req)) !=
-      sizeof(madvise_req)) {
-    die("Failed to read parameters for madvise() [process]");
-  }
-  int rc = -EINVAL;
-  switch (madvise_req.advice) {
-    case MADV_NORMAL:
-    case MADV_RANDOM:
-    case MADV_SEQUENTIAL:
-    case MADV_WILLNEED:
-    ok:
-      SecureMem::sendSystemCall(threadFdPub, false, -1, mem, __NR_madvise,
-                                madvise_req.start, madvise_req.len,
-                                madvise_req.advice);
-      return true;
-    default:
-      // All other flags to madvise() are potential dangerous (as opposed to
-      // merely affecting overall performance). Do not allow them on memory
-      // ranges that were part of the original mappings.
-      void *stop = reinterpret_cast<void *>(
-          (char *)madvise_req.start + madvise_req.len);
-      ProtectedMap::const_iterator iter = protectedMap_.lower_bound(
-          (void *)madvise_req.start);
-      if (iter != protectedMap_.begin()) {
-        --iter;
-      }
-      for (; iter != protectedMap_.end() && iter->first < stop; ++iter) {
-        if (madvise_req.start < reinterpret_cast<void *>(
-                reinterpret_cast<char *>(iter->first) + iter->second) &&
-            stop > iter->first) {
-          SecureMem::abandonSystemCall(threadFd, rc);
-          return false;
-        }
-      }
-
-      // Changing attributes on memory regions that were newly mapped inside of
-      // the sandbox is OK.
-      goto ok;
-  }
-}
-
-} // namespace