gnu: libxtst: Fix CVE-2016-{7951,7952}.
* gnu/packages/patches/libxtst-CVE-2016-7951-CVE-2016-7952.patch: New file. * gnu/local.mk (dist_patch_DATA): Add it. * gnu/packages/xorg.scm (libxtst)[replacement]: New field. (libxtst/fixed): New variable.
This commit is contained in:
Leo Famulari
parent
666d40193c
commit
1f90b80f8b
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@ -676,6 +676,7 @@ dist_patch_DATA = \
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%D%/packages/patches/libxrandr-CVE-2016-7947-CVE-2016-7948.patch \
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%D%/packages/patches/libxrender-CVE-2016-7949.patch \
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%D%/packages/patches/libxrender-CVE-2016-7950.patch \
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%D%/packages/patches/libxtst-CVE-2016-7951-CVE-2016-7952.patch \
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%D%/packages/patches/libxslt-generated-ids.patch \
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%D%/packages/patches/lirc-localstatedir.patch \
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%D%/packages/patches/llvm-for-extempore.patch \
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@ -0,0 +1,152 @@
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Fix CVE-2016-7951 and CVE-2016-7952
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https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-7951
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https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-7952
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Patch copied from upstream source repository:
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https://cgit.freedesktop.org/xorg/lib/libXtst/commit/?id=9556ad67af3129ec4a7a4f4b54a0d59701beeae3
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From 9556ad67af3129ec4a7a4f4b54a0d59701beeae3 Mon Sep 17 00:00:00 2001
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From: Tobias Stoeckmann <tobias@stoeckmann.org>
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Date: Sun, 25 Sep 2016 21:37:01 +0200
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Subject: [PATCH] Out of boundary access and endless loop in libXtst
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A lack of range checks in libXtst allows out of boundary accesses.
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The checks have to be done in-place here, because it cannot be done
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without in-depth knowledge of the read data.
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If XRecordStartOfData, XRecordEndOfData, or XRecordClientDied
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without a client sequence have attached data, an endless loop would
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occur. The do-while-loop continues until the current index reaches
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the end. But in these cases, the current index would not be
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incremented, leading to an endless processing.
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Signed-off-by: Tobias Stoeckmann <tobias@stoeckmann.org>
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Reviewed-by: Matthieu Herrb <matthieu@herrb.eu>
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---
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src/XRecord.c | 43 +++++++++++++++++++++++++++++++++++++++----
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1 file changed, 39 insertions(+), 4 deletions(-)
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diff --git a/src/XRecord.c b/src/XRecord.c
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index 50420c0..fefd842 100644
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--- a/src/XRecord.c
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+++ b/src/XRecord.c
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@@ -749,15 +749,23 @@ parse_reply_call_callback(
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switch (rep->category) {
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case XRecordFromServer:
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if (rep->elementHeader&XRecordFromServerTime) {
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+ if (current_index + 4 > rep->length << 2)
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+ return Error;
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EXTRACT_CARD32(rep->clientSwapped,
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reply->buf+current_index,
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data->server_time);
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current_index += 4;
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}
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+ if (current_index + 1 > rep->length << 2)
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+ return Error;
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switch (reply->buf[current_index]) {
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case X_Reply: /* reply */
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+ if (current_index + 8 > rep->length << 2)
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+ return Error;
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EXTRACT_CARD32(rep->clientSwapped,
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reply->buf+current_index+4, datum_bytes);
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+ if (datum_bytes < 0 || datum_bytes > ((INT_MAX >> 2) - 8))
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+ return Error;
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datum_bytes = (datum_bytes+8) << 2;
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break;
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default: /* error or event */
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@@ -766,52 +774,73 @@ parse_reply_call_callback(
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break;
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case XRecordFromClient:
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if (rep->elementHeader&XRecordFromClientTime) {
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+ if (current_index + 4 > rep->length << 2)
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+ return Error;
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EXTRACT_CARD32(rep->clientSwapped,
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reply->buf+current_index,
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data->server_time);
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current_index += 4;
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}
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if (rep->elementHeader&XRecordFromClientSequence) {
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+ if (current_index + 4 > rep->length << 2)
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+ return Error;
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EXTRACT_CARD32(rep->clientSwapped,
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reply->buf+current_index,
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data->client_seq);
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current_index += 4;
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}
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+ if (current_index + 4 > rep->length<<2)
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+ return Error;
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if (reply->buf[current_index+2] == 0
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&& reply->buf[current_index+3] == 0) /* needn't swap 0 */
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{ /* BIG-REQUESTS */
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+ if (current_index + 8 > rep->length << 2)
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+ return Error;
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EXTRACT_CARD32(rep->clientSwapped,
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reply->buf+current_index+4, datum_bytes);
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} else {
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EXTRACT_CARD16(rep->clientSwapped,
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reply->buf+current_index+2, datum_bytes);
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}
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+ if (datum_bytes < 0 || datum_bytes > INT_MAX >> 2)
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+ return Error;
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datum_bytes <<= 2;
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break;
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case XRecordClientStarted:
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+ if (current_index + 8 > rep->length << 2)
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+ return Error;
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EXTRACT_CARD16(rep->clientSwapped,
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reply->buf+current_index+6, datum_bytes);
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datum_bytes = (datum_bytes+2) << 2;
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break;
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case XRecordClientDied:
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if (rep->elementHeader&XRecordFromClientSequence) {
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+ if (current_index + 4 > rep->length << 2)
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+ return Error;
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EXTRACT_CARD32(rep->clientSwapped,
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reply->buf+current_index,
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data->client_seq);
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current_index += 4;
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- }
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- /* fall through */
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+ } else if (current_index < rep->length << 2)
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+ return Error;
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+ datum_bytes = 0;
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+ break;
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case XRecordStartOfData:
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case XRecordEndOfData:
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+ if (current_index < rep->length << 2)
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+ return Error;
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datum_bytes = 0;
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+ break;
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}
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if (datum_bytes > 0) {
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- if (current_index + datum_bytes > rep->length << 2)
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+ if (INT_MAX - datum_bytes < (rep->length << 2) - current_index) {
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fprintf(stderr,
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"XRecord: %lu-byte reply claims %d-byte element (seq %lu)\n",
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- (long)rep->length << 2, current_index + datum_bytes,
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+ (unsigned long)rep->length << 2, current_index + datum_bytes,
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dpy->last_request_read);
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+ return Error;
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+ }
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/*
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* This assignment (and indeed the whole buffer sharing
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* scheme) assumes arbitrary 4-byte boundaries are
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@@ -863,6 +892,12 @@ XRecordEnableContext(Display *dpy, XRecordContext context,
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return 0;
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}
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+ if (rep.length > INT_MAX >> 2) {
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+ UnlockDisplay(dpy);
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+ SyncHandle();
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+ return 0;
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+ }
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+
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if (rep.length > 0) {
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reply = alloc_reply_buffer(info, rep.length<<2);
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if (!reply) {
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--
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2.10.1
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@ -4639,6 +4639,7 @@ cannot be adequately worked around on the client side of the wire.")
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(define-public libxtst
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(package
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(name "libxtst")
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(replacement libxtst/fixed)
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(version "1.2.2")
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(source
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(origin
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@ -4674,6 +4675,13 @@ The RECORD extension supports the recording and reporting of all core X
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protocol and arbitrary X extension protocol.")
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(license license:x11)))
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(define libxtst/fixed
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(package
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(inherit libxtst)
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(source (origin
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(inherit (package-source libxtst))
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(patches (search-patches
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"libxtst-CVE-2016-7951-CVE-2016-7952.patch"))))))
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(define-public libxv
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(package
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