xorg: Security fix for CVE-2020-14345

Source: freedesktop.org
MR: 105894
Type: Security Fix
Disposition: Backport from https://gitlab.freedesktop.org/xorg/xserver/-/commit/f7cd1276bbd4fe3a9700096dec33b52b8440788d
ChangeID: 2c6b7553d8e5bc152258ad1794d95cb7d8b215eb
Description:

CVE-2020-14345 fix

Signed-off-by: Armin Kuster <akuster@mvista.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>

2 files changed, 183 insertions, 0 deletions

diff --git a/meta/recipes-graphics/xorg-xserver/xserver-xorg/CVE-2020-14345.patch b/meta/recipes-graphics/xorg-xserver/xserver-xorg/CVE-2020-14345.patch
new file mode 100644
index 0000000000..fb3a37c474
--- /dev/null
+++ b/meta/recipes-graphics/xorg-xserver/xserver-xorg/CVE-2020-14345.patch
@@ -0,0 +1,182 @@
+From f7cd1276bbd4fe3a9700096dec33b52b8440788d Mon Sep 17 00:00:00 2001
+From: Matthieu Herrb <matthieu@herrb.eu>
+Date: Tue, 18 Aug 2020 14:46:32 +0200
+Subject: [PATCH] Correct bounds checking in XkbSetNames()
+
+CVE-2020-14345 / ZDI 11428
+
+This vulnerability was discovered by:
+Jan-Niklas Sohn working with Trend Micro Zero Day Initiative
+
+Signed-off-by: Matthieu Herrb <matthieu@herrb.eu>
+
+Upstream-Status: Backport
+CVE: CVE-2020-14345
+Affects < 1.20.9
+
+Signed-off-by: Armin Kuster <akuster@mvista.com>
+
+---
+ xkb/xkb.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
+ 1 file changed, 48 insertions(+)
+
+Index: xorg-server-1.20.8/xkb/xkb.c
+===================================================================
+--- xorg-server-1.20.8.orig/xkb/xkb.c
++++ xorg-server-1.20.8/xkb/xkb.c
+@@ -152,6 +152,19 @@ static RESTYPE RT_XKBCLIENT;
+ #define	CHK_REQ_KEY_RANGE(err,first,num,r)  \
+ 	CHK_REQ_KEY_RANGE2(err,first,num,r,client->errorValue,BadValue)
+ 
++static Bool
++_XkbCheckRequestBounds(ClientPtr client, void *stuff, void *from, void *to) {
++    char *cstuff = (char *)stuff;
++    char *cfrom = (char *)from;
++    char *cto = (char *)to;
++
++    return cfrom < cto &&
++           cfrom >= cstuff &&
++           cfrom < cstuff + ((size_t)client->req_len << 2) &&
++           cto >= cstuff &&
++           cto <= cstuff + ((size_t)client->req_len << 2);
++}
++
+ /***====================================================================***/
+ 
+ int
+@@ -4045,6 +4058,8 @@ _XkbSetNamesCheck(ClientPtr client, Devi
+             client->errorValue = _XkbErrCode2(0x04, stuff->firstType);
+             return BadAccess;
+         }
++        if (!_XkbCheckRequestBounds(client, stuff, tmp, tmp + stuff->nTypes))
++            return BadLength;
+         old = tmp;
+         tmp = _XkbCheckAtoms(tmp, stuff->nTypes, client->swapped, &bad);
+         if (!tmp) {
+@@ -4074,6 +4089,8 @@ _XkbSetNamesCheck(ClientPtr client, Devi
+         }
+         width = (CARD8 *) tmp;
+         tmp = (CARD32 *) (((char *) tmp) + XkbPaddedSize(stuff->nKTLevels));
++        if (!_XkbCheckRequestBounds(client, stuff, width, tmp))
++            return BadLength;
+         type = &xkb->map->types[stuff->firstKTLevel];
+         for (i = 0; i < stuff->nKTLevels; i++, type++) {
+             if (width[i] == 0)
+@@ -4083,6 +4100,8 @@ _XkbSetNamesCheck(ClientPtr client, Devi
+                                                   type->num_levels, width[i]);
+                 return BadMatch;
+             }
++            if (!_XkbCheckRequestBounds(client, stuff, tmp, tmp + width[i]))
++                return BadLength;
+             tmp = _XkbCheckAtoms(tmp, width[i], client->swapped, &bad);
+             if (!tmp) {
+                 client->errorValue = bad;
+@@ -4095,6 +4114,9 @@ _XkbSetNamesCheck(ClientPtr client, Devi
+             client->errorValue = 0x08;
+             return BadMatch;
+         }
++        if (!_XkbCheckRequestBounds(client, stuff, tmp,
++                                    tmp + Ones(stuff->indicators)))
++            return BadLength;
+         tmp = _XkbCheckMaskedAtoms(tmp, XkbNumIndicators, stuff->indicators,
+                                    client->swapped, &bad);
+         if (!tmp) {
+@@ -4107,6 +4129,9 @@ _XkbSetNamesCheck(ClientPtr client, Devi
+             client->errorValue = 0x09;
+             return BadMatch;
+         }
++        if (!_XkbCheckRequestBounds(client, stuff, tmp,
++                                    tmp + Ones(stuff->virtualMods)))
++            return BadLength;
+         tmp = _XkbCheckMaskedAtoms(tmp, XkbNumVirtualMods,
+                                    (CARD32) stuff->virtualMods,
+                                    client->swapped, &bad);
+@@ -4120,6 +4145,9 @@ _XkbSetNamesCheck(ClientPtr client, Devi
+             client->errorValue = 0x0a;
+             return BadMatch;
+         }
++        if (!_XkbCheckRequestBounds(client, stuff, tmp,
++                                    tmp + Ones(stuff->groupNames)))
++            return BadLength;
+         tmp = _XkbCheckMaskedAtoms(tmp, XkbNumKbdGroups,
+                                    (CARD32) stuff->groupNames,
+                                    client->swapped, &bad);
+@@ -4141,9 +4169,14 @@ _XkbSetNamesCheck(ClientPtr client, Devi
+                              stuff->nKeys);
+             return BadValue;
+         }
++        if (!_XkbCheckRequestBounds(client, stuff, tmp, tmp + stuff->nKeys))
++            return BadLength;
+         tmp += stuff->nKeys;
+     }
+     if ((stuff->which & XkbKeyAliasesMask) && (stuff->nKeyAliases > 0)) {
++        if (!_XkbCheckRequestBounds(client, stuff, tmp,
++                                    tmp + (stuff->nKeyAliases * 2)))
++            return BadLength;
+         tmp += stuff->nKeyAliases * 2;
+     }
+     if (stuff->which & XkbRGNamesMask) {
+@@ -4151,6 +4184,9 @@ _XkbSetNamesCheck(ClientPtr client, Devi
+             client->errorValue = _XkbErrCode2(0x0d, stuff->nRadioGroups);
+             return BadValue;
+         }
++        if (!_XkbCheckRequestBounds(client, stuff, tmp,
++                                    tmp + stuff->nRadioGroups))
++            return BadLength;
+         tmp = _XkbCheckAtoms(tmp, stuff->nRadioGroups, client->swapped, &bad);
+         if (!tmp) {
+             client->errorValue = bad;
+@@ -4344,6 +4380,8 @@ ProcXkbSetNames(ClientPtr client)
+     /* check device-independent stuff */
+     tmp = (CARD32 *) &stuff[1];
+ 
++    if (!_XkbCheckRequestBounds(client, stuff, tmp, tmp + 1))
++        return BadLength;
+     if (stuff->which & XkbKeycodesNameMask) {
+         tmp = _XkbCheckAtoms(tmp, 1, client->swapped, &bad);
+         if (!tmp) {
+@@ -4351,6 +4389,8 @@ ProcXkbSetNames(ClientPtr client)
+             return BadAtom;
+         }
+     }
++    if (!_XkbCheckRequestBounds(client, stuff, tmp, tmp + 1))
++        return BadLength;
+     if (stuff->which & XkbGeometryNameMask) {
+         tmp = _XkbCheckAtoms(tmp, 1, client->swapped, &bad);
+         if (!tmp) {
+@@ -4358,6 +4398,8 @@ ProcXkbSetNames(ClientPtr client)
+             return BadAtom;
+         }
+     }
++    if (!_XkbCheckRequestBounds(client, stuff, tmp, tmp + 1))
++        return BadLength;
+     if (stuff->which & XkbSymbolsNameMask) {
+         tmp = _XkbCheckAtoms(tmp, 1, client->swapped, &bad);
+         if (!tmp) {
+@@ -4365,6 +4407,8 @@ ProcXkbSetNames(ClientPtr client)
+             return BadAtom;
+         }
+     }
++    if (!_XkbCheckRequestBounds(client, stuff, tmp, tmp + 1))
++        return BadLength;
+     if (stuff->which & XkbPhysSymbolsNameMask) {
+         tmp = _XkbCheckAtoms(tmp, 1, client->swapped, &bad);
+         if (!tmp) {
+@@ -4372,6 +4416,8 @@ ProcXkbSetNames(ClientPtr client)
+             return BadAtom;
+         }
+     }
++    if (!_XkbCheckRequestBounds(client, stuff, tmp, tmp + 1))
++        return BadLength;
+     if (stuff->which & XkbTypesNameMask) {
+         tmp = _XkbCheckAtoms(tmp, 1, client->swapped, &bad);
+         if (!tmp) {
+@@ -4379,6 +4425,8 @@ ProcXkbSetNames(ClientPtr client)
+             return BadAtom;
+         }
+     }
++    if (!_XkbCheckRequestBounds(client, stuff, tmp, tmp + 1))
++        return BadLength;
+     if (stuff->which & XkbCompatNameMask) {
+         tmp = _XkbCheckAtoms(tmp, 1, client->swapped, &bad);
+         if (!tmp) {
diff --git a/meta/recipes-graphics/xorg-xserver/xserver-xorg_1.20.8.bb b/meta/recipes-graphics/xorg-xserver/xserver-xorg_1.20.8.bb
index 51d959f86c..2af1b6f307 100644
--- a/meta/recipes-graphics/xorg-xserver/xserver-xorg_1.20.8.bb
+++ b/meta/recipes-graphics/xorg-xserver/xserver-xorg_1.20.8.bb
@@ -9,6 +9,7 @@ SRC_URI += "file://0001-xf86pciBus.c-use-Intel-ddx-only-for-pre-gen4-hardwar.pat
            file://CVE-2020-14346.patch \
            file://CVE-2020-14361.patch \
            file://CVE-2020-14362.patch \
+           file://CVE-2020-14345.patch \
            "
 SRC_URI[md5sum] = "a770aec600116444a953ff632f51f839"
 SRC_URI[sha256sum] = "d17b646bee4ba0fb7850c1cc55b18e3e8513ed5c02bdf38da7e107f84e2d0146"