ipc/glue/SharedMemory_posix.cpp@97036ab72558
ipc/glue/SharedMemory_posix.cpp
Tue, 06 Jan 2015 21:39:09 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Tue, 06 Jan 2015 21:39:09 +0100
- branch
- TOR_BUG_9701
- changeset 8
- 97036ab72558
- permissions
- -rw-r--r--
Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.
1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
2 * vim: sw=2 ts=8 et :
3 */
4 /* This Source Code Form is subject to the terms of the Mozilla Public
5 * License, v. 2.0. If a copy of the MPL was not distributed with this
6 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
8 #include <sys/mman.h> // mprotect
9 #include <unistd.h> // sysconf
11 #include "mozilla/ipc/SharedMemory.h"
13 namespace mozilla {
14 namespace ipc {
16 void
17 SharedMemory::SystemProtect(char* aAddr, size_t aSize, int aRights)
18 {
19 int flags = 0;
20 if (aRights & RightsRead)
21 flags |= PROT_READ;
22 if (aRights & RightsWrite)
23 flags |= PROT_WRITE;
24 if (RightsNone == aRights)
25 flags = PROT_NONE;
27 if (0 < mprotect(aAddr, aSize, flags))
28 NS_RUNTIMEABORT("can't mprotect()");
29 }
31 size_t
32 SharedMemory::SystemPageSize()
33 {
34 return sysconf(_SC_PAGESIZE);
35 }
37 } // namespace ipc
38 } // namespace mozilla
