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gnu: libxi: Fix CVE-2016-{7945,7946}. 

* gnu/packages/patches/libxi-CVE-2016-7945-CVE-2016-7946.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/xorg.scm (libxi)[replacement]: New field.
(libxi/fixed): New variable.
master
Leo Famulari 2016-10-05 13:18:56 -04:00
parent b50c6bf2a8
commit b78ba2274f
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3 changed files with 429 additions and 0 deletions
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1
gnu/local.mk
View File

@ -672,6 +672,7 @@ dist_patch_DATA = \
%D%/packages/patches/libx11-CVE-2016-7942.patch \ %D%/packages/patches/libx11-CVE-2016-7942.patch \
%D%/packages/patches/libx11-CVE-2016-7943.patch \ %D%/packages/patches/libx11-CVE-2016-7943.patch \
%D%/packages/patches/libxfixes-CVE-2016-7944.patch \ %D%/packages/patches/libxfixes-CVE-2016-7944.patch \
%D%/packages/patches/libxi-CVE-2016-7945-CVE-2016-7946.patch \
%D%/packages/patches/libxslt-generated-ids.patch \ %D%/packages/patches/libxslt-generated-ids.patch \
%D%/packages/patches/lirc-localstatedir.patch \ %D%/packages/patches/lirc-localstatedir.patch \
%D%/packages/patches/llvm-for-extempore.patch \ %D%/packages/patches/llvm-for-extempore.patch \

420
gnu/packages/patches/libxi-CVE-2016-7945-CVE-2016-7946.patch Normal file
View File

@ -0,0 +1,420 @@
Fix CVE-2016-7945:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-7945
Patch copied from upstream source repository:
https://cgit.freedesktop.org/xorg/lib/libXi/commit/?id=19a9cd607de73947fcfb104682f203ffe4e1f4e5
From 19a9cd607de73947fcfb104682f203ffe4e1f4e5 Mon Sep 17 00:00:00 2001
From: Tobias Stoeckmann <tobias@stoeckmann.org>
Date: Sun, 25 Sep 2016 22:31:34 +0200
Subject: [PATCH] Properly validate server responses.
By validating length fields from server responses, out of boundary
accesses and endless loops can be mitigated.
Signed-off-by: Tobias Stoeckmann <tobias@stoeckmann.org>
Reviewed-by: Matthieu Herrb <matthieu@herrb.eu>
---
src/XGMotion.c | 3 ++-
src/XGetBMap.c | 3 ++-
src/XGetDCtl.c | 6 ++++--
src/XGetFCtl.c | 7 ++++++-
src/XGetKMap.c | 14 +++++++++++---
src/XGetMMap.c | 11 +++++++++--
src/XIQueryDevice.c | 36 ++++++++++++++++++++++++++++++++++--
src/XListDev.c | 21 +++++++++++++++------
src/XOpenDev.c | 13 ++++++++++---
src/XQueryDv.c | 8 ++++++--
10 files changed, 99 insertions(+), 23 deletions(-)
diff --git a/src/XGMotion.c b/src/XGMotion.c
index 7785843..9433e29 100644
--- a/src/XGMotion.c
+++ b/src/XGMotion.c
@@ -114,7 +114,8 @@ XGetDeviceMotionEvents(
}
/* rep.axes is a CARD8, so assume max number of axes for bounds check */
if (rep.nEvents <
- (INT_MAX / (sizeof(XDeviceTimeCoord) + (UCHAR_MAX * sizeof(int))))) {
+ (INT_MAX / (sizeof(XDeviceTimeCoord) + (UCHAR_MAX * sizeof(int)))) &&
+ rep.nEvents * (rep.axes + 1) <= rep.length) {
size_t bsize = rep.nEvents *
(sizeof(XDeviceTimeCoord) + (rep.axes * sizeof(int)));
bufp = Xmalloc(bsize);
diff --git a/src/XGetBMap.c b/src/XGetBMap.c
index 002daba..13bb8c6 100644
--- a/src/XGetBMap.c
+++ b/src/XGetBMap.c
@@ -92,7 +92,8 @@ XGetDeviceButtonMapping(
status = _XReply(dpy, (xReply *) & rep, 0, xFalse);
if (status == 1) {
- if (rep.length <= (sizeof(mapping) >> 2)) {
+ if (rep.length <= (sizeof(mapping) >> 2) &&
+ rep.nElts <= (rep.length << 2)) {
unsigned long nbytes = rep.length << 2;
_XRead(dpy, (char *)mapping, nbytes);
diff --git a/src/XGetDCtl.c b/src/XGetDCtl.c
index c5d3b53..7f6b396 100644
--- a/src/XGetDCtl.c
+++ b/src/XGetDCtl.c
@@ -93,7 +93,8 @@ XGetDeviceControl(
if (rep.length > 0) {
unsigned long nbytes;
size_t size = 0;
- if (rep.length < (INT_MAX >> 2)) {
+ if (rep.length < (INT_MAX >> 2) &&
+ (rep.length << 2) >= sizeof(xDeviceState)) {
nbytes = (unsigned long) rep.length << 2;
d = Xmalloc(nbytes);
}
@@ -117,7 +118,8 @@ XGetDeviceControl(
size_t val_size;
r = (xDeviceResolutionState *) d;
- if (r->num_valuators >= (INT_MAX / (3 * sizeof(int))))
+ if (sizeof(xDeviceResolutionState) > nbytes ||
+ r->num_valuators >= (INT_MAX / (3 * sizeof(int))))
goto out;
val_size = 3 * sizeof(int) * r->num_valuators;
if ((sizeof(xDeviceResolutionState) + val_size) > nbytes)
diff --git a/src/XGetFCtl.c b/src/XGetFCtl.c
index 7fd6d0e..82dcc64 100644
--- a/src/XGetFCtl.c
+++ b/src/XGetFCtl.c
@@ -73,6 +73,7 @@ XGetFeedbackControl(
XFeedbackState *Sav = NULL;
xFeedbackState *f = NULL;
xFeedbackState *sav = NULL;
+ char *end = NULL;
xGetFeedbackControlReq *req;
xGetFeedbackControlReply rep;
XExtDisplayInfo *info = XInput_find_display(dpy);
@@ -105,10 +106,12 @@ XGetFeedbackControl(
goto out;
}
sav = f;
+ end = (char *)f + nbytes;
_XRead(dpy, (char *)f, nbytes);
for (i = 0; i < *num_feedbacks; i++) {
- if (f->length > nbytes)
+ if ((char *)f + sizeof(*f) > end ||
+ f->length == 0 || f->length > nbytes)
goto out;
nbytes -= f->length;
@@ -125,6 +128,8 @@ XGetFeedbackControl(
case StringFeedbackClass:
{
xStringFeedbackState *strf = (xStringFeedbackState *) f;
+ if ((char *)f + sizeof(*strf) > end)
+ goto out;
size += sizeof(XStringFeedbackState) +
(strf->num_syms_supported * sizeof(KeySym));
}
diff --git a/src/XGetKMap.c b/src/XGetKMap.c
index 0540ce4..008a72b 100644
--- a/src/XGetKMap.c
+++ b/src/XGetKMap.c
@@ -54,6 +54,7 @@ SOFTWARE.
#include <config.h>
#endif
+#include <limits.h>
#include <X11/extensions/XI.h>
#include <X11/extensions/XIproto.h>
#include <X11/Xlibint.h>
@@ -93,9 +94,16 @@ XGetDeviceKeyMapping(register Display * dpy, XDevice * dev,
return (KeySym *) NULL;
}
if (rep.length > 0) {
- *syms_per_code = rep.keySymsPerKeyCode;
- nbytes = (long)rep.length << 2;
- mapping = (KeySym *) Xmalloc((unsigned)nbytes);
+ if (rep.length < INT_MAX >> 2 &&
+ rep.length == rep.keySymsPerKeyCode * keycount) {
+ *syms_per_code = rep.keySymsPerKeyCode;
+ nbytes = (long)rep.length << 2;
+ mapping = (KeySym *) Xmalloc((unsigned)nbytes);
+ } else {
+ *syms_per_code = 0;
+ nbytes = 0;
+ mapping = NULL;
+ }
if (mapping)
_XRead(dpy, (char *)mapping, nbytes);
else
diff --git a/src/XGetMMap.c b/src/XGetMMap.c
index 246698c..33c114f 100644
--- a/src/XGetMMap.c
+++ b/src/XGetMMap.c
@@ -53,6 +53,7 @@ SOFTWARE.
#include <config.h>
#endif
+#include <limits.h>
#include <X11/extensions/XI.h>
#include <X11/extensions/XIproto.h>
#include <X11/Xlibint.h>
@@ -85,8 +86,14 @@ XGetDeviceModifierMapping(
SyncHandle();
return (XModifierKeymap *) NULL;
}
- nbytes = (unsigned long)rep.length << 2;
- res = (XModifierKeymap *) Xmalloc(sizeof(XModifierKeymap));
+ if (rep.length < (INT_MAX >> 2) &&
+ rep.numKeyPerModifier == rep.length >> 1) {
+ nbytes = (unsigned long)rep.length << 2;
+ res = (XModifierKeymap *) Xmalloc(sizeof(XModifierKeymap));
+ } else {
+ nbytes = 0;
+ res = NULL;
+ }
if (res) {
res->modifiermap = (KeyCode *) Xmalloc(nbytes);
if (res->modifiermap)
diff --git a/src/XIQueryDevice.c b/src/XIQueryDevice.c
index fb8504f..a457cd6 100644
--- a/src/XIQueryDevice.c
+++ b/src/XIQueryDevice.c
@@ -26,6 +26,7 @@
#include <config.h>
#endif
+#include <limits.h>
#include <stdint.h>
#include <X11/Xlibint.h>
#include <X11/extensions/XI2proto.h>
@@ -43,6 +44,7 @@ XIQueryDevice(Display *dpy, int deviceid, int *ndevices_return)
xXIQueryDeviceReq *req;
xXIQueryDeviceReply reply;
char *ptr;
+ char *end;
int i;
char *buf;
@@ -60,14 +62,24 @@ XIQueryDevice(Display *dpy, int deviceid, int *ndevices_return)
if (!_XReply(dpy, (xReply*) &reply, 0, xFalse))
goto error;
- *ndevices_return = reply.num_devices;
- info = Xmalloc((reply.num_devices + 1) * sizeof(XIDeviceInfo));
+ if (reply.length < INT_MAX / 4)
+ {
+ *ndevices_return = reply.num_devices;
+ info = Xmalloc((reply.num_devices + 1) * sizeof(XIDeviceInfo));
+ }
+ else
+ {
+ *ndevices_return = 0;
+ info = NULL;
+ }
+
if (!info)
goto error;
buf = Xmalloc(reply.length * 4);
_XRead(dpy, buf, reply.length * 4);
ptr = buf;
+ end = buf + reply.length * 4;
/* info is a null-terminated array */
info[reply.num_devices].name = NULL;
@@ -79,6 +91,9 @@ XIQueryDevice(Display *dpy, int deviceid, int *ndevices_return)
XIDeviceInfo *lib = &info[i];
xXIDeviceInfo *wire = (xXIDeviceInfo*)ptr;
+ if (ptr + sizeof(xXIDeviceInfo) > end)
+ goto error_loop;
+
lib->deviceid = wire->deviceid;
lib->use = wire->use;
lib->attachment = wire->attachment;
@@ -87,12 +102,23 @@ XIQueryDevice(Display *dpy, int deviceid, int *ndevices_return)
ptr += sizeof(xXIDeviceInfo);
+ if (ptr + wire->name_len > end)
+ goto error_loop;
+
lib->name = Xcalloc(wire->name_len + 1, 1);
+ if (lib->name == NULL)
+ goto error_loop;
strncpy(lib->name, ptr, wire->name_len);
+ lib->name[wire->name_len] = '\0';
ptr += ((wire->name_len + 3)/4) * 4;
sz = size_classes((xXIAnyInfo*)ptr, nclasses);
lib->classes = Xmalloc(sz);
+ if (lib->classes == NULL)
+ {
+ Xfree(lib->name);
+ goto error_loop;
+ }
ptr += copy_classes(lib, (xXIAnyInfo*)ptr, &nclasses);
/* We skip over unused classes */
lib->num_classes = nclasses;
@@ -103,6 +129,12 @@ XIQueryDevice(Display *dpy, int deviceid, int *ndevices_return)
SyncHandle();
return info;
+error_loop:
+ while (--i >= 0)
+ {
+ Xfree(info[i].name);
+ Xfree(info[i].classes);
+ }
error:
UnlockDisplay(dpy);
error_unlocked:
diff --git a/src/XListDev.c b/src/XListDev.c
index b85ff3c..f850cd0 100644
--- a/src/XListDev.c
+++ b/src/XListDev.c
@@ -74,7 +74,7 @@ static int pad_to_xid(int base_size)
}
static size_t
-SizeClassInfo(xAnyClassPtr *any, int num_classes)
+SizeClassInfo(xAnyClassPtr *any, size_t len, int num_classes)
{
int size = 0;
int j;
@@ -90,6 +90,8 @@ SizeClassInfo(xAnyClassPtr *any, int num_classes)
{
xValuatorInfoPtr v;
+ if (len < sizeof(v))
+ return 0;
v = (xValuatorInfoPtr) *any;
size += pad_to_xid(sizeof(XValuatorInfo) +
(v->num_axes * sizeof(XAxisInfo)));
@@ -98,6 +100,8 @@ SizeClassInfo(xAnyClassPtr *any, int num_classes)
default:
break;
}
+ if ((*any)->length > len)
+ return 0;
*any = (xAnyClassPtr) ((char *)(*any) + (*any)->length);
}
@@ -170,7 +174,7 @@ XListInputDevices(
register Display *dpy,
int *ndevices)
{
- size_t size;
+ size_t s, size;
xListInputDevicesReq *req;
xListInputDevicesReply rep;
xDeviceInfo *list, *slist = NULL;
@@ -178,6 +182,7 @@ XListInputDevices(
XDeviceInfo *clist = NULL;
xAnyClassPtr any, sav_any;
XAnyClassPtr Any;
+ char *end = NULL;
unsigned char *nptr, *Nptr;
int i;
unsigned long rlen;
@@ -213,16 +218,20 @@ XListInputDevices(
any = (xAnyClassPtr) ((char *)list + (*ndevices * sizeof(xDeviceInfo)));
sav_any = any;
+ end = (char *)list + rlen;
for (i = 0; i < *ndevices; i++, list++) {
- size += SizeClassInfo(&any, (int)list->num_classes);
+ s = SizeClassInfo(&any, end - (char *)any, (int)list->num_classes);
+ if (!s)
+ goto out;
+ size += s;
}
- Nptr = ((unsigned char *)list) + rlen + 1;
+ Nptr = ((unsigned char *)list) + rlen;
for (i = 0, nptr = (unsigned char *)any; i < *ndevices; i++) {
+ if (nptr >= Nptr)
+ goto out;
size += *nptr + 1;
nptr += (*nptr + 1);
- if (nptr > Nptr)
- goto out;
}
clist = (XDeviceInfoPtr) Xmalloc(size);
diff --git a/src/XOpenDev.c b/src/XOpenDev.c
index 029dec2..4b3c460 100644
--- a/src/XOpenDev.c
+++ b/src/XOpenDev.c
@@ -53,6 +53,7 @@ SOFTWARE.
#include <config.h>
#endif
+#include <limits.h>
#include <X11/extensions/XI.h>
#include <X11/extensions/XIproto.h>
#include <X11/Xlibint.h>
@@ -86,9 +87,15 @@ XOpenDevice(
return (XDevice *) NULL;
}
- rlen = rep.length << 2;
- dev = (XDevice *) Xmalloc(sizeof(XDevice) + rep.num_classes *
- sizeof(XInputClassInfo));
+ if (rep.length < INT_MAX >> 2 &&
+ (rep.length << 2) >= rep.num_classes * sizeof(xInputClassInfo)) {
+ rlen = rep.length << 2;
+ dev = (XDevice *) Xmalloc(sizeof(XDevice) + rep.num_classes *
+ sizeof(XInputClassInfo));
+ } else {
+ rlen = 0;
+ dev = NULL;
+ }
if (dev) {
int dlen; /* data length */
diff --git a/src/XQueryDv.c b/src/XQueryDv.c
index de1c0e5..7ee2272 100644
--- a/src/XQueryDv.c
+++ b/src/XQueryDv.c
@@ -73,7 +73,7 @@ XQueryDeviceState(
xQueryDeviceStateReply rep;
XDeviceState *state = NULL;
XInputClass *any, *Any;
- char *data = NULL;
+ char *data = NULL, *end = NULL;
XExtDisplayInfo *info = XInput_find_display(dpy);
LockDisplay(dpy);
@@ -92,6 +92,7 @@ XQueryDeviceState(
if (rep.length < (INT_MAX >> 2)) {
rlen = (unsigned long) rep.length << 2;
data = Xmalloc(rlen);
+ end = data + rlen;
}
if (!data) {
_XEatDataWords(dpy, rep.length);
@@ -100,7 +101,8 @@ XQueryDeviceState(
_XRead(dpy, data, rlen);
for (i = 0, any = (XInputClass *) data; i < (int)rep.num_classes; i++) {
- if (any->length > rlen)
+ if ((char *)any + sizeof(XInputClass) > end ||
+ any->length == 0 || any->length > rlen)
goto out;
rlen -= any->length;
@@ -114,6 +116,8 @@ XQueryDeviceState(
case ValuatorClass:
{
xValuatorState *v = (xValuatorState *) any;
+ if ((char *)any + sizeof(xValuatorState) > end)
+ goto out;
size += (sizeof(XValuatorState) +
(v->num_valuators * sizeof(int)));
}
--
2.10.1

8
gnu/packages/xorg.scm
View File

@ -4896,6 +4896,7 @@ new API's in libXft, or the legacy API's in libX11.")
(define-public libxi (define-public libxi
(package (package
(name "libxi") (name "libxi")
(replacement libxi/fixed)
(version "1.7.6") (version "1.7.6")
(source (source
(origin (origin
@ -4922,6 +4923,13 @@ new API's in libXft, or the legacy API's in libX11.")
(description "Library for the XInput Extension to the X11 protocol.") (description "Library for the XInput Extension to the X11 protocol.")
(license license:x11))) (license license:x11)))
(define libxi/fixed
(package
(inherit libxi)
(source (origin
(inherit (package-source libxi))
(patches (search-patches
"libxi-CVE-2016-7945-CVE-2016-7946.patch"))))))
(define-public libxrandr (define-public libxrandr
(package (package