xserver-kdrive: Fix X server on PowerPC when built with GCC 4.7.x

Newer versions of GCC uncovered illegal code practice which can cause
runtime failures in the Xext/xace.c code.  This problem has been fixed upstream:
  http://cgit.freedesktop.org/xorg/xserver/patch/Xext/xace.c?id=6dae7f3792611aace1df0cca63bf50c50d93de43
  Subject: xace: Invalid reference to out-of-scope data.

Incorporate this patch into the recipe, with a PR bump.

Signed-off-by: Gary Thomas <gary@mlbassoc.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 235 insertions, 1 deletions

diff --git a/meta/recipes-graphics/xorg-xserver/xserver-kdrive-1.7.99.2/fix-bogus-stack-variables.patch b/meta/recipes-graphics/xorg-xserver/xserver-kdrive-1.7.99.2/fix-bogus-stack-variables.patch
new file mode 100644
index 0000000000..b4e293facb
--- /dev/null
+++ b/meta/recipes-graphics/xorg-xserver/xserver-kdrive-1.7.99.2/fix-bogus-stack-variables.patch
@@ -0,0 +1,233 @@
+From 6dae7f3792611aace1df0cca63bf50c50d93de43 Mon Sep 17 00:00:00 2001
+From: Chris Wilson <chris@chris-wilson.co.uk>
+Date: Tue, 10 Aug 2010 18:30:20 +0000
+Subject: xace: Invalid reference to out-of-scope data.
+
+The callback data passed by reference to the hook was allocated on stack
+within the scope of the case statement. The compiler is free to reuse
+any of that stack space whilst making the function call so we may end up
+passing garbage into the callback.
+
+References:
+
+  Bug 18451 - Xorg server 1.5.2 SEGV during XFixesGetCursorImage()
+  https://bugs.freedesktop.org/show_bug.cgi?id=18451
+
+v2: Drop the unrelated hunk that snuck in when ammending the commit
+message.
+
+Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
+Reviewed-by: Alan Coopersmith <alan.coopersmith@oracle.com>
+Signed-off-by: Keith Packard <keithp@keithp.com>
+
+Upstream-Status: accepted
+---
+(limited to 'Xext/xace.c')
+
+diff --git a/Xext/xace.c b/Xext/xace.c
+index e10d837..c757cad 100644
+--- a/Xext/xace.c
++++ b/Xext/xace.c
+@@ -87,7 +87,18 @@ void XaceHookAuditEnd(ClientPtr ptr, int result)
+  */
+ int XaceHook(int hook, ...)
+ {
+-    pointer calldata;	/* data passed to callback */
++    union {
++	XaceResourceAccessRec res;
++	XaceDeviceAccessRec dev;
++	XaceSendAccessRec send;
++	XaceReceiveAccessRec recv;
++	XaceClientAccessRec client;
++	XaceExtAccessRec ext;
++	XaceServerAccessRec server;
++	XaceScreenAccessRec screen;
++	XaceAuthAvailRec auth;
++	XaceKeyAvailRec key;
++    } u;
+     int *prv = NULL;	/* points to return value from callback */
+     va_list ap;		/* argument list */
+     va_start(ap, hook);
+@@ -99,117 +110,86 @@ int XaceHook(int hook, ...)
+      */
+     switch (hook)
+     {
+-	case XACE_RESOURCE_ACCESS: {
+-	    XaceResourceAccessRec rec;
+-	    rec.client = va_arg(ap, ClientPtr);
+-	    rec.id = va_arg(ap, XID);
+-	    rec.rtype = va_arg(ap, RESTYPE);
+-	    rec.res = va_arg(ap, pointer);
+-	    rec.ptype = va_arg(ap, RESTYPE);
+-	    rec.parent = va_arg(ap, pointer);
+-	    rec.access_mode = va_arg(ap, Mask);
+-	    rec.status = Success; /* default allow */
+-	    calldata = &rec;
+-	    prv = &rec.status;
++	case XACE_RESOURCE_ACCESS:
++	    u.res.client = va_arg(ap, ClientPtr);
++	    u.res.id = va_arg(ap, XID);
++	    u.res.rtype = va_arg(ap, RESTYPE);
++	    u.res.res = va_arg(ap, pointer);
++	    u.res.ptype = va_arg(ap, RESTYPE);
++	    u.res.parent = va_arg(ap, pointer);
++	    u.res.access_mode = va_arg(ap, Mask);
++	    u.res.status = Success; /* default allow */
++	    prv = &u.res.status;
+ 	    break;
+-	}
+-	case XACE_DEVICE_ACCESS: {
+-	    XaceDeviceAccessRec rec;
+-	    rec.client = va_arg(ap, ClientPtr);
+-	    rec.dev = va_arg(ap, DeviceIntPtr);
+-	    rec.access_mode = va_arg(ap, Mask);
+-	    rec.status = Success; /* default allow */
+-	    calldata = &rec;
+-	    prv = &rec.status;
++	case XACE_DEVICE_ACCESS:
++	    u.dev.client = va_arg(ap, ClientPtr);
++	    u.dev.dev = va_arg(ap, DeviceIntPtr);
++	    u.dev.access_mode = va_arg(ap, Mask);
++	    u.dev.status = Success; /* default allow */
++	    prv = &u.dev.status;
+ 	    break;
+-	}
+-	case XACE_SEND_ACCESS: {
+-	    XaceSendAccessRec rec;
+-	    rec.client = va_arg(ap, ClientPtr);
+-	    rec.dev = va_arg(ap, DeviceIntPtr);
+-	    rec.pWin = va_arg(ap, WindowPtr);
+-	    rec.events = va_arg(ap, xEventPtr);
+-	    rec.count = va_arg(ap, int);
+-	    rec.status = Success; /* default allow */
+-	    calldata = &rec;
+-	    prv = &rec.status;
++	case XACE_SEND_ACCESS:
++	    u.send.client = va_arg(ap, ClientPtr);
++	    u.send.dev = va_arg(ap, DeviceIntPtr);
++	    u.send.pWin = va_arg(ap, WindowPtr);
++	    u.send.events = va_arg(ap, xEventPtr);
++	    u.send.count = va_arg(ap, int);
++	    u.send.status = Success; /* default allow */
++	    prv = &u.send.status;
+ 	    break;
+-	}
+-	case XACE_RECEIVE_ACCESS: {
+-	    XaceReceiveAccessRec rec;
+-	    rec.client = va_arg(ap, ClientPtr);
+-	    rec.pWin = va_arg(ap, WindowPtr);
+-	    rec.events = va_arg(ap, xEventPtr);
+-	    rec.count = va_arg(ap, int);
+-	    rec.status = Success; /* default allow */
+-	    calldata = &rec;
+-	    prv = &rec.status;
++	case XACE_RECEIVE_ACCESS:
++	    u.recv.client = va_arg(ap, ClientPtr);
++	    u.recv.pWin = va_arg(ap, WindowPtr);
++	    u.recv.events = va_arg(ap, xEventPtr);
++	    u.recv.count = va_arg(ap, int);
++	    u.recv.status = Success; /* default allow */
++	    prv = &u.recv.status;
+ 	    break;
+-	}
+-	case XACE_CLIENT_ACCESS: {
+-	    XaceClientAccessRec rec;
+-	    rec.client = va_arg(ap, ClientPtr);
+-	    rec.target = va_arg(ap, ClientPtr);
+-	    rec.access_mode = va_arg(ap, Mask);
+-	    rec.status = Success; /* default allow */
+-	    calldata = &rec;
+-	    prv = &rec.status;
++	case XACE_CLIENT_ACCESS:
++	    u.client.client = va_arg(ap, ClientPtr);
++	    u.client.target = va_arg(ap, ClientPtr);
++	    u.client.access_mode = va_arg(ap, Mask);
++	    u.client.status = Success; /* default allow */
++	    prv = &u.client.status;
+ 	    break;
+-	}
+-	case XACE_EXT_ACCESS: {
+-	    XaceExtAccessRec rec;
+-	    rec.client = va_arg(ap, ClientPtr);
+-	    rec.ext = va_arg(ap, ExtensionEntry*);
+-	    rec.access_mode = DixGetAttrAccess;
+-	    rec.status = Success; /* default allow */
+-	    calldata = &rec;
+-	    prv = &rec.status;
++	case XACE_EXT_ACCESS:
++	    u.ext.client = va_arg(ap, ClientPtr);
++	    u.ext.ext = va_arg(ap, ExtensionEntry*);
++	    u.ext.access_mode = DixGetAttrAccess;
++	    u.ext.status = Success; /* default allow */
++	    prv = &u.ext.status;
+ 	    break;
+-	}
+-	case XACE_SERVER_ACCESS: {
+-	    XaceServerAccessRec rec;
+-	    rec.client = va_arg(ap, ClientPtr);
+-	    rec.access_mode = va_arg(ap, Mask);
+-	    rec.status = Success; /* default allow */
+-	    calldata = &rec;
+-	    prv = &rec.status;
++	case XACE_SERVER_ACCESS:
++	    u.server.client = va_arg(ap, ClientPtr);
++	    u.server.access_mode = va_arg(ap, Mask);
++	    u.server.status = Success; /* default allow */
++	    prv = &u.server.status;
+ 	    break;
+-	}
+ 	case XACE_SCREEN_ACCESS:
+-	case XACE_SCREENSAVER_ACCESS: {
+-	    XaceScreenAccessRec rec;
+-	    rec.client = va_arg(ap, ClientPtr);
+-	    rec.screen = va_arg(ap, ScreenPtr);
+-	    rec.access_mode = va_arg(ap, Mask);
+-	    rec.status = Success; /* default allow */
+-	    calldata = &rec;
+-	    prv = &rec.status;
++	case XACE_SCREENSAVER_ACCESS:
++	    u.screen.client = va_arg(ap, ClientPtr);
++	    u.screen.screen = va_arg(ap, ScreenPtr);
++	    u.screen.access_mode = va_arg(ap, Mask);
++	    u.screen.status = Success; /* default allow */
++	    prv = &u.screen.status;
+ 	    break;
+-	}
+-	case XACE_AUTH_AVAIL: {
+-	    XaceAuthAvailRec rec;
+-	    rec.client = va_arg(ap, ClientPtr);
+-	    rec.authId = va_arg(ap, XID);
+-	    calldata = &rec;
++	case XACE_AUTH_AVAIL:
++	    u.auth.client = va_arg(ap, ClientPtr);
++	    u.auth.authId = va_arg(ap, XID);
+ 	    break;
+-	}
+-	case XACE_KEY_AVAIL: {
+-	    XaceKeyAvailRec rec;
+-	    rec.event = va_arg(ap, xEventPtr);
+-	    rec.keybd = va_arg(ap, DeviceIntPtr);
+-	    rec.count = va_arg(ap, int);
+-	    calldata = &rec;
++	case XACE_KEY_AVAIL:
++	    u.key.event = va_arg(ap, xEventPtr);
++	    u.key.keybd = va_arg(ap, DeviceIntPtr);
++	    u.key.count = va_arg(ap, int);
+ 	    break;
+-	}
+-	default: {
++	default:
+ 	    va_end(ap);
+ 	    return 0;	/* unimplemented hook number */
+-	}
+     }
+     va_end(ap);
+  
+     /* call callbacks and return result, if any. */
+-    CallCallbacks(&XaceHooks[hook], calldata);
++    CallCallbacks(&XaceHooks[hook], &u);
+     return prv ? *prv : Success;
+ }
+ 
+--
+cgit v0.9.0.2-2-gbebe
diff --git a/meta/recipes-graphics/xorg-xserver/xserver-kdrive_1.7.99.2.bb b/meta/recipes-graphics/xorg-xserver/xserver-kdrive_1.7.99.2.bb
index 360a0f3ab9..d90dc250e5 100644
--- a/meta/recipes-graphics/xorg-xserver/xserver-kdrive_1.7.99.2.bb
+++ b/meta/recipes-graphics/xorg-xserver/xserver-kdrive_1.7.99.2.bb
@@ -7,7 +7,7 @@ RDEPENDS_${PN} += "xkeyboard-config"
 EXTRA_OECONF += "--disable-glx"
 
 PE = "1"
-PR = "r29"
+PR = "r30"
 
 SRC_URI = "${XORG_MIRROR}/individual/xserver/xorg-server-${PV}.tar.bz2 \
 	file://extra-kmodes.patch \
@@ -20,6 +20,7 @@ SRC_URI = "${XORG_MIRROR}/individual/xserver/xorg-server-${PV}.tar.bz2 \
 	file://fix-newer-xorg-headers.patch \
 	file://crosscompile.patch \
 	file://error-address-work-around.patch \
+        file://fix-bogus-stack-variables.patch \
 	file://nodolt.patch"
 #	file://kdrive-evdev.patch
 #	file://kdrive-use-evdev.patch