From 20b26bdb3dd5e46b01b9a7e1ce8342074df3c89c Mon Sep 17 00:00:00 2001
From: Thiago Macieira <thiago.macieira@intel.com>
Date: Sat, 22 Dec 2012 08:32:12 -0800
Subject: [PATCH] Change all shmget calls to user-only memory

Drop the read and write permissions for group and other users in the
system.

Change-Id: I8fc753f09126651af3fb82df3049050f0b14e876
(cherry-picked from Qt 5 commit 856f209fb63ae336bfb389a12d2a75fa886dc1c5)
Reviewed-by: Richard J. Moore <rich@kde.org>

Upstream-Status: Accepted http://qt.gitorious.org/qt/qt/commit/20b26bdb3dd5e46b01b9a7e1ce8342074df3c89c
---
 src/corelib/kernel/qsharedmemory_unix.cpp          |    6 +++---
 src/corelib/kernel/qsystemsemaphore_unix.cpp       |    4 ++--
 src/gui/image/qnativeimage.cpp                     |    2 +-
 src/gui/image/qpixmap_x11.cpp                      |    2 +-
 src/plugins/platforms/xcb/qxcbwindowsurface.cpp    |    2 +-
 src/plugins/platforms/xlib/qxlibwindowsurface.cpp  |    2 +-
 .../auto/qtipc/qsharedmemory/tst_qsharedmemory.cpp |    2 +-
 tools/qvfb/qvfbshmem.cpp                           |    4 ++--
 8 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/src/corelib/kernel/qsharedmemory_unix.cpp b/src/corelib/kernel/qsharedmemory_unix.cpp
index 20d76e3..4cf3acf 100644
--- a/src/corelib/kernel/qsharedmemory_unix.cpp
+++ b/src/corelib/kernel/qsharedmemory_unix.cpp
@@ -238,7 +238,7 @@ bool QSharedMemoryPrivate::create(int size)
     }
 
     // create
-    if (-1 == shmget(unix_key, size, 0666 | IPC_CREAT | IPC_EXCL)) {
+    if (-1 == shmget(unix_key, size, 0600 | IPC_CREAT | IPC_EXCL)) {
         QString function = QLatin1String("QSharedMemory::create");
         switch (errno) {
         case EINVAL:
@@ -293,7 +293,7 @@ bool QSharedMemoryPrivate::attach(QSharedMemory::AccessMode mode)
 {
 #ifndef QT_POSIX_IPC
     // grab the shared memory segment id
-    int id = shmget(unix_key, 0, (mode == QSharedMemory::ReadOnly ? 0444 : 0660));
+    int id = shmget(unix_key, 0, (mode == QSharedMemory::ReadOnly ? 0400 : 0600));
     if (-1 == id) {
         setErrorString(QLatin1String("QSharedMemory::attach (shmget)"));
         return false;
@@ -381,7 +381,7 @@ bool QSharedMemoryPrivate::detach()
     size = 0;
 
     // Get the number of current attachments
-    int id = shmget(unix_key, 0, 0444);
+    int id = shmget(unix_key, 0, 0400);
     cleanHandle();
 
     struct shmid_ds shmid_ds;
diff --git a/src/corelib/kernel/qsystemsemaphore_unix.cpp b/src/corelib/kernel/qsystemsemaphore_unix.cpp
index fad9acc..e77456b 100644
--- a/src/corelib/kernel/qsystemsemaphore_unix.cpp
+++ b/src/corelib/kernel/qsystemsemaphore_unix.cpp
@@ -153,10 +153,10 @@ key_t QSystemSemaphorePrivate::handle(QSystemSemaphore::AccessMode mode)
     }
 
     // Get semaphore
-    semaphore = semget(unix_key, 1, 0666 | IPC_CREAT | IPC_EXCL);
+    semaphore = semget(unix_key, 1, 0600 | IPC_CREAT | IPC_EXCL);
     if (-1 == semaphore) {
         if (errno == EEXIST)
-            semaphore = semget(unix_key, 1, 0666 | IPC_CREAT);
+            semaphore = semget(unix_key, 1, 0600 | IPC_CREAT);
         if (-1 == semaphore) {
             setErrorString(QLatin1String("QSystemSemaphore::handle"));
             cleanHandle();
diff --git a/src/gui/image/qnativeimage.cpp b/src/gui/image/qnativeimage.cpp
index 9654afe..fef38c5 100644
--- a/src/gui/image/qnativeimage.cpp
+++ b/src/gui/image/qnativeimage.cpp
@@ -176,7 +176,7 @@ QNativeImage::QNativeImage(int width, int height, QImage::Format format,bool /*
 
     bool ok;
     xshminfo.shmid = shmget(IPC_PRIVATE, xshmimg->bytes_per_line * xshmimg->height,
-                            IPC_CREAT | 0777);
+                            IPC_CREAT | 0700);
     ok = xshminfo.shmid != -1;
     if (ok) {
         xshmimg->data = (char*)shmat(xshminfo.shmid, 0, 0);
diff --git a/src/gui/image/qpixmap_x11.cpp b/src/gui/image/qpixmap_x11.cpp
index 280d8bd..88c9b7b 100644
--- a/src/gui/image/qpixmap_x11.cpp
+++ b/src/gui/image/qpixmap_x11.cpp
@@ -193,7 +193,7 @@ static bool qt_create_mitshm_buffer(const QPaintDevice* dev, int w, int h)
     bool ok;
     xshminfo.shmid = shmget(IPC_PRIVATE,
                              xshmimg->bytes_per_line * xshmimg->height,
-                             IPC_CREAT | 0777);
+                             IPC_CREAT | 0700);
     ok = xshminfo.shmid != -1;
     if (ok) {
         xshmimg->data = (char*)shmat(xshminfo.shmid, 0, 0);
diff --git a/src/plugins/platforms/xcb/qxcbwindowsurface.cpp b/src/plugins/platforms/xcb/qxcbwindowsurface.cpp
index b6a42d8..0d56821 100644
--- a/src/plugins/platforms/xcb/qxcbwindowsurface.cpp
+++ b/src/plugins/platforms/xcb/qxcbwindowsurface.cpp
@@ -98,7 +98,7 @@ QXcbShmImage::QXcbShmImage(QXcbScreen *screen, const QSize &size, uint depth, QI
                                           0);
 
     m_shm_info.shmid = shmget (IPC_PRIVATE,
-          m_xcb_image->stride * m_xcb_image->height, IPC_CREAT|0777);
+          m_xcb_image->stride * m_xcb_image->height, IPC_CREAT|0600);
 
     m_shm_info.shmaddr = m_xcb_image->data = (quint8 *)shmat (m_shm_info.shmid, 0, 0);
     m_shm_info.shmseg = xcb_generate_id(xcb_connection());
diff --git a/src/plugins/platforms/xlib/qxlibwindowsurface.cpp b/src/plugins/platforms/xlib/qxlibwindowsurface.cpp
index bf003eb..46a2f97 100644
--- a/src/plugins/platforms/xlib/qxlibwindowsurface.cpp
+++ b/src/plugins/platforms/xlib/qxlibwindowsurface.cpp
@@ -99,7 +99,7 @@ void QXlibWindowSurface::resizeShmImage(int width, int height)
 
 
     image_info->shminfo.shmid = shmget (IPC_PRIVATE,
-          image->bytes_per_line * image->height, IPC_CREAT|0777);
+          image->bytes_per_line * image->height, IPC_CREAT|0700);
 
     image_info->shminfo.shmaddr = image->data = (char*)shmat (image_info->shminfo.shmid, 0, 0);
     image_info->shminfo.readOnly = False;
diff --git a/tools/qvfb/qvfbshmem.cpp b/tools/qvfb/qvfbshmem.cpp
index 7f9671f..84b6ebe 100644
--- a/tools/qvfb/qvfbshmem.cpp
+++ b/tools/qvfb/qvfbshmem.cpp
@@ -176,13 +176,13 @@ QShMemViewProtocol::QShMemViewProtocol(int displayid, const QSize &s,
     uint data_offset_value = sizeof(QVFbHeader);
 
     int dataSize = bpl * h + data_offset_value;
-    shmId = shmget(key, dataSize, IPC_CREAT | 0666);
+    shmId = shmget(key, dataSize, IPC_CREAT | 0600);
     if (shmId != -1)
 	data = (unsigned char *)shmat(shmId, 0, 0);
     else {
 	struct shmid_ds shm;
 	shmctl(shmId, IPC_RMID, &shm);
-	shmId = shmget(key, dataSize, IPC_CREAT | 0666);
+    shmId = shmget(key, dataSize, IPC_CREAT | 0600);
 	if (shmId == -1) {
             perror("QShMemViewProtocol::QShMemViewProtocol");
             qFatal("Cannot get shared memory 0x%08x", key);
-- 
1.7.1

