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From d244c8272e0ac47c41a9416e37293903b842a78b Mon Sep 17 00:00:00 2001
From: Matthieu Herrb <matthieu@bluenote.herrb.com>
Date: Thu, 17 Jan 2008 15:27:34 +0100
Subject: [PATCH] Fix for CVE-2007-6427 - Xinput extension memory corruption.
---
Xi/chgfctl.c | 7 +------
Xi/chgkmap.c | 13 ++++++-------
Xi/chgprop.c | 10 +++-------
Xi/grabdev.c | 12 +++++-------
Xi/grabdevb.c | 10 +++-------
Xi/grabdevk.c | 9 ++-------
Xi/selectev.c | 11 ++++-------
Xi/sendexev.c | 14 ++++++++------
8 files changed, 32 insertions(+), 54 deletions(-)
diff --git a/Xi/chgfctl.c b/Xi/chgfctl.c
index 2e0e13c..235d659 100644
--- a/Xi/chgfctl.c
+++ b/Xi/chgfctl.c
@@ -327,18 +327,13 @@ ChangeStringFeedback(ClientPtr client, DeviceIntPtr dev,
xStringFeedbackCtl * f)
{
char n;
- long *p;
int i, j;
KeySym *syms, *sup_syms;
syms = (KeySym *) (f + 1);
if (client->swapped) {
swaps(&f->length, n); /* swapped num_keysyms in calling proc */
- p = (long *)(syms);
- for (i = 0; i < f->num_keysyms; i++) {
- swapl(p, n);
- p++;
- }
+ SwapLongs((CARD32 *) syms, f->num_keysyms);
}
if (f->num_keysyms > s->ctrl.max_symbols) {
diff --git a/Xi/chgkmap.c b/Xi/chgkmap.c
index eac520f..f8f85bc 100644
--- a/Xi/chgkmap.c
+++ b/Xi/chgkmap.c
@@ -79,18 +79,14 @@ int
SProcXChangeDeviceKeyMapping(ClientPtr client)
{
char n;
- long *p;
- int i, count;
+ unsigned int count;
REQUEST(xChangeDeviceKeyMappingReq);
swaps(&stuff->length, n);
REQUEST_AT_LEAST_SIZE(xChangeDeviceKeyMappingReq);
- p = (long *)&stuff[1];
count = stuff->keyCodes * stuff->keySymsPerKeyCode;
- for (i = 0; i < count; i++) {
- swapl(p, n);
- p++;
- }
+ REQUEST_FIXED_SIZE(xChangeDeviceKeyMappingReq, count * sizeof(CARD32));
+ SwapLongs((CARD32 *) (&stuff[1]), count);
return (ProcXChangeDeviceKeyMapping(client));
}
@@ -106,10 +102,13 @@ ProcXChangeDeviceKeyMapping(ClientPtr client)
int ret;
unsigned len;
DeviceIntPtr dev;
+ unsigned int count;
REQUEST(xChangeDeviceKeyMappingReq);
REQUEST_AT_LEAST_SIZE(xChangeDeviceKeyMappingReq);
+ count = stuff->keyCodes * stuff->keySymsPerKeyCode;
+ REQUEST_FIXED_SIZE(xChangeDeviceKeyMappingReq, count * sizeof(CARD32));
dev = LookupDeviceIntRec(stuff->deviceid);
if (dev == NULL) {
SendErrorToClient(client, IReqCode, X_ChangeDeviceKeyMapping, 0,
diff --git a/Xi/chgprop.c b/Xi/chgprop.c
index 59a93c6..21bda5b 100644
--- a/Xi/chgprop.c
+++ b/Xi/chgprop.c
@@ -81,19 +81,15 @@ int
SProcXChangeDeviceDontPropagateList(ClientPtr client)
{
char n;
- long *p;
- int i;
REQUEST(xChangeDeviceDontPropagateListReq);
swaps(&stuff->length, n);
REQUEST_AT_LEAST_SIZE(xChangeDeviceDontPropagateListReq);
swapl(&stuff->window, n);
swaps(&stuff->count, n);
- p = (long *)&stuff[1];
- for (i = 0; i < stuff->count; i++) {
- swapl(p, n);
- p++;
- }
+ REQUEST_FIXED_SIZE(xChangeDeviceDontPropagateListReq,
+ stuff->count * sizeof(CARD32));
+ SwapLongs((CARD32 *) (&stuff[1]), stuff->count);
return (ProcXChangeDeviceDontPropagateList(client));
}
diff --git a/Xi/grabdev.c b/Xi/grabdev.c
index e2809ef..d0b4ae7 100644
--- a/Xi/grabdev.c
+++ b/Xi/grabdev.c
@@ -82,8 +82,6 @@ int
SProcXGrabDevice(ClientPtr client)
{
char n;
- long *p;
- int i;
REQUEST(xGrabDeviceReq);
swaps(&stuff->length, n);
@@ -91,11 +89,11 @@ SProcXGrabDevice(ClientPtr client)
swapl(&stuff->grabWindow, n);
swapl(&stuff->time, n);
swaps(&stuff->event_count, n);
- p = (long *)&stuff[1];
- for (i = 0; i < stuff->event_count; i++) {
- swapl(p, n);
- p++;
- }
+
+ if (stuff->length != (sizeof(xGrabDeviceReq) >> 2) + stuff->event_count)
+ return BadLength;
+
+ SwapLongs((CARD32 *) (&stuff[1]), stuff->event_count);
return (ProcXGrabDevice(client));
}
diff --git a/Xi/grabdevb.c b/Xi/grabdevb.c
index df62d0c..18db1f7 100644
--- a/Xi/grabdevb.c
+++ b/Xi/grabdevb.c
@@ -80,8 +80,6 @@ int
SProcXGrabDeviceButton(ClientPtr client)
{
char n;
- long *p;
- int i;
REQUEST(xGrabDeviceButtonReq);
swaps(&stuff->length, n);
@@ -89,11 +87,9 @@ SProcXGrabDeviceButton(ClientPtr client)
swapl(&stuff->grabWindow, n);
swaps(&stuff->modifiers, n);
swaps(&stuff->event_count, n);
- p = (long *)&stuff[1];
- for (i = 0; i < stuff->event_count; i++) {
- swapl(p, n);
- p++;
- }
+ REQUEST_FIXED_SIZE(xGrabDeviceButtonReq,
+ stuff->event_count * sizeof(CARD32));
+ SwapLongs((CARD32 *) (&stuff[1]), stuff->event_count);
return (ProcXGrabDeviceButton(client));
}
diff --git a/Xi/grabdevk.c b/Xi/grabdevk.c
index b74592f..429b2f7 100644
--- a/Xi/grabdevk.c
+++ b/Xi/grabdevk.c
@@ -80,8 +80,6 @@ int
SProcXGrabDeviceKey(ClientPtr client)
{
char n;
- long *p;
- int i;
REQUEST(xGrabDeviceKeyReq);
swaps(&stuff->length, n);
@@ -89,11 +87,8 @@ SProcXGrabDeviceKey(ClientPtr client)
swapl(&stuff->grabWindow, n);
swaps(&stuff->modifiers, n);
swaps(&stuff->event_count, n);
- p = (long *)&stuff[1];
- for (i = 0; i < stuff->event_count; i++) {
- swapl(p, n);
- p++;
- }
+ REQUEST_FIXED_SIZE(xGrabDeviceKeyReq, stuff->event_count * sizeof(CARD32));
+ SwapLongs((CARD32 *) (&stuff[1]), stuff->event_count);
return (ProcXGrabDeviceKey(client));
}
diff --git a/Xi/selectev.c b/Xi/selectev.c
index d52db1b..19415c5 100644
--- a/Xi/selectev.c
+++ b/Xi/selectev.c
@@ -131,19 +131,16 @@ int
SProcXSelectExtensionEvent(ClientPtr client)
{
char n;
- long *p;
- int i;
REQUEST(xSelectExtensionEventReq);
swaps(&stuff->length, n);
REQUEST_AT_LEAST_SIZE(xSelectExtensionEventReq);
swapl(&stuff->window, n);
swaps(&stuff->count, n);
- p = (long *)&stuff[1];
- for (i = 0; i < stuff->count; i++) {
- swapl(p, n);
- p++;
- }
+ REQUEST_FIXED_SIZE(xSelectExtensionEventReq,
+ stuff->count * sizeof(CARD32));
+ SwapLongs((CARD32 *) (&stuff[1]), stuff->count);
+
return (ProcXSelectExtensionEvent(client));
}
diff --git a/Xi/sendexev.c b/Xi/sendexev.c
index eac9abe..9803cf3 100644
--- a/Xi/sendexev.c
+++ b/Xi/sendexev.c
@@ -83,7 +83,7 @@ int
SProcXSendExtensionEvent(ClientPtr client)
{
char n;
- long *p;
+ CARD32 *p;
int i;
xEvent eventT;
xEvent *eventP;
@@ -94,6 +94,11 @@ SProcXSendExtensionEvent(ClientPtr client)
REQUEST_AT_LEAST_SIZE(xSendExtensionEventReq);
swapl(&stuff->destination, n);
swaps(&stuff->count, n);
+
+ if (stuff->length != (sizeof(xSendExtensionEventReq) >> 2) + stuff->count +
+ (stuff->num_events * (sizeof(xEvent) >> 2)))
+ return BadLength;
+
eventP = (xEvent *) & stuff[1];
for (i = 0; i < stuff->num_events; i++, eventP++) {
proc = EventSwapVector[eventP->u.u.type & 0177];
@@ -103,11 +108,8 @@ SProcXSendExtensionEvent(ClientPtr client)
*eventP = eventT;
}
- p = (long *)(((xEvent *) & stuff[1]) + stuff->num_events);
- for (i = 0; i < stuff->count; i++) {
- swapl(p, n);
- p++;
- }
+ p = (CARD32 *)(((xEvent *) & stuff[1]) + stuff->num_events);
+ SwapLongs(p, stuff->count);
return (ProcXSendExtensionEvent(client));
}
--
1.5.3.5
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