184 lines
6.8 KiB
Diff
184 lines
6.8 KiB
Diff
From bd134231e282d9eb126b6fdaa40bb383180fa72b Mon Sep 17 00:00:00 2001
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From: Peter Hutterer <peter.hutterer@who-t.net>
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Date: Tue, 5 Jul 2022 11:11:06 +1000
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Subject: [PATCH xserver 3/3] xkb: add request length validation for
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XkbSetGeometry
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No validation of the various fields on that report were done, so a
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malicious client could send a short request that claims it had N
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sections, or rows, or keys, and the server would process the request for
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N sections, running out of bounds of the actual request data.
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Fix this by adding size checks to ensure our data is valid.
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ZDI-CAN 16062, CVE-2022-2319.
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This vulnerability was discovered by:
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Jan-Niklas Sohn working with Trend Micro Zero Day Initiative
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Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
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(cherry picked from commit 6907b6ea2b4ce949cb07271f5b678d5966d9df42)
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---
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xkb/xkb.c | 43 ++++++++++++++++++++++++++++++++++++++-----
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1 file changed, 38 insertions(+), 5 deletions(-)
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diff --git a/xkb/xkb.c b/xkb/xkb.c
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index 36464a770..27d19793e 100644
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--- a/xkb/xkb.c
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+++ b/xkb/xkb.c
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@@ -5160,7 +5160,7 @@ _GetCountedString(char **wire_inout, ClientPtr client, char **str)
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}
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static Status
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-_CheckSetDoodad(char **wire_inout,
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+_CheckSetDoodad(char **wire_inout, xkbSetGeometryReq *req,
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XkbGeometryPtr geom, XkbSectionPtr section, ClientPtr client)
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{
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char *wire;
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@@ -5171,6 +5171,9 @@ _CheckSetDoodad(char **wire_inout,
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Status status;
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dWire = (xkbDoodadWireDesc *) (*wire_inout);
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+ if (!_XkbCheckRequestBounds(client, req, dWire, dWire + 1))
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+ return BadLength;
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+
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any = dWire->any;
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wire = (char *) &dWire[1];
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if (client->swapped) {
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@@ -5273,7 +5276,7 @@ _CheckSetDoodad(char **wire_inout,
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}
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static Status
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-_CheckSetOverlay(char **wire_inout,
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+_CheckSetOverlay(char **wire_inout, xkbSetGeometryReq *req,
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XkbGeometryPtr geom, XkbSectionPtr section, ClientPtr client)
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{
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register int r;
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@@ -5284,6 +5287,9 @@ _CheckSetOverlay(char **wire_inout,
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wire = *wire_inout;
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olWire = (xkbOverlayWireDesc *) wire;
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+ if (!_XkbCheckRequestBounds(client, req, olWire, olWire + 1))
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+ return BadLength;
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+
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if (client->swapped) {
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swapl(&olWire->name);
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}
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@@ -5295,6 +5301,9 @@ _CheckSetOverlay(char **wire_inout,
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xkbOverlayKeyWireDesc *kWire;
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XkbOverlayRowPtr row;
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+ if (!_XkbCheckRequestBounds(client, req, rWire, rWire + 1))
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+ return BadLength;
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+
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if (rWire->rowUnder > section->num_rows) {
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client->errorValue = _XkbErrCode4(0x20, r, section->num_rows,
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rWire->rowUnder);
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@@ -5303,6 +5312,9 @@ _CheckSetOverlay(char **wire_inout,
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row = XkbAddGeomOverlayRow(ol, rWire->rowUnder, rWire->nKeys);
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kWire = (xkbOverlayKeyWireDesc *) &rWire[1];
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for (k = 0; k < rWire->nKeys; k++, kWire++) {
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+ if (!_XkbCheckRequestBounds(client, req, kWire, kWire + 1))
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+ return BadLength;
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+
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if (XkbAddGeomOverlayKey(ol, row,
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(char *) kWire->over,
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(char *) kWire->under) == NULL) {
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@@ -5336,6 +5348,9 @@ _CheckSetSections(XkbGeometryPtr geom,
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register int r;
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xkbRowWireDesc *rWire;
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+ if (!_XkbCheckRequestBounds(client, req, sWire, sWire + 1))
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+ return BadLength;
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+
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if (client->swapped) {
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swapl(&sWire->name);
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swaps(&sWire->top);
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@@ -5361,6 +5376,9 @@ _CheckSetSections(XkbGeometryPtr geom,
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XkbRowPtr row;
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xkbKeyWireDesc *kWire;
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+ if (!_XkbCheckRequestBounds(client, req, rWire, rWire + 1))
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+ return BadLength;
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+
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if (client->swapped) {
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swaps(&rWire->top);
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swaps(&rWire->left);
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@@ -5375,6 +5393,9 @@ _CheckSetSections(XkbGeometryPtr geom,
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for (k = 0; k < rWire->nKeys; k++, kWire++) {
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XkbKeyPtr key;
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+ if (!_XkbCheckRequestBounds(client, req, kWire, kWire + 1))
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+ return BadLength;
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+
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key = XkbAddGeomKey(row);
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if (!key)
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return BadAlloc;
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@@ -5400,7 +5421,7 @@ _CheckSetSections(XkbGeometryPtr geom,
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register int d;
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for (d = 0; d < sWire->nDoodads; d++) {
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- status = _CheckSetDoodad(&wire, geom, section, client);
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+ status = _CheckSetDoodad(&wire, req, geom, section, client);
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if (status != Success)
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return status;
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}
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@@ -5409,7 +5430,7 @@ _CheckSetSections(XkbGeometryPtr geom,
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register int o;
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for (o = 0; o < sWire->nOverlays; o++) {
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- status = _CheckSetOverlay(&wire, geom, section, client);
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+ status = _CheckSetOverlay(&wire, req, geom, section, client);
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if (status != Success)
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return status;
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}
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@@ -5443,6 +5464,9 @@ _CheckSetShapes(XkbGeometryPtr geom,
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xkbOutlineWireDesc *olWire;
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XkbOutlinePtr ol;
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+ if (!_XkbCheckRequestBounds(client, req, shapeWire, shapeWire + 1))
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+ return BadLength;
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+
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shape =
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XkbAddGeomShape(geom, shapeWire->name, shapeWire->nOutlines);
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if (!shape)
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@@ -5453,12 +5477,18 @@ _CheckSetShapes(XkbGeometryPtr geom,
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XkbPointPtr pt;
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xkbPointWireDesc *ptWire;
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+ if (!_XkbCheckRequestBounds(client, req, olWire, olWire + 1))
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+ return BadLength;
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+
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ol = XkbAddGeomOutline(shape, olWire->nPoints);
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if (!ol)
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return BadAlloc;
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ol->corner_radius = olWire->cornerRadius;
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ptWire = (xkbPointWireDesc *) &olWire[1];
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for (p = 0, pt = ol->points; p < olWire->nPoints; p++, pt++, ptWire++) {
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+ if (!_XkbCheckRequestBounds(client, req, ptWire, ptWire + 1))
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+ return BadLength;
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+
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pt->x = ptWire->x;
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pt->y = ptWire->y;
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if (client->swapped) {
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@@ -5564,12 +5594,15 @@ _CheckSetGeom(XkbGeometryPtr geom, xkbSetGeometryReq * req, ClientPtr client)
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return status;
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for (i = 0; i < req->nDoodads; i++) {
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- status = _CheckSetDoodad(&wire, geom, NULL, client);
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+ status = _CheckSetDoodad(&wire, req, geom, NULL, client);
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if (status != Success)
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return status;
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}
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for (i = 0; i < req->nKeyAliases; i++) {
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+ if (!_XkbCheckRequestBounds(client, req, wire, wire + XkbKeyNameLength))
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+ return BadLength;
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+
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if (XkbAddGeomKeyAlias(geom, &wire[XkbKeyNameLength], wire) == NULL)
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return BadAlloc;
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wire += 2 * XkbKeyNameLength;
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--
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2.36.1
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