63 lines
1.7 KiB
Diff
63 lines
1.7 KiB
Diff
Fix CVE-2016-7944:
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https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-7944
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Patch copied from upstream source repository:
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https://cgit.freedesktop.org/xorg/lib/libXfixes/commit/?id=61c1039ee23a2d1de712843bed3480654d7ef42e
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From 61c1039ee23a2d1de712843bed3480654d7ef42e 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 22:38:44 +0200
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Subject: [PATCH] Integer overflow on illegal server response
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The 32 bit field "rep.length" is not checked for validity, which allows
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an integer overflow on 32 bit systems.
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A malicious server could send INT_MAX as length, which gets multiplied
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by the size of XRectangle. In that case the client won't read the whole
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data from server, getting out of sync.
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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/Region.c | 15 ++++++++++++---
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1 file changed, 12 insertions(+), 3 deletions(-)
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diff --git a/src/Region.c b/src/Region.c
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index cb0cf6e..59bcc1a 100644
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--- a/src/Region.c
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+++ b/src/Region.c
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@@ -23,6 +23,7 @@
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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+#include <limits.h>
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#include "Xfixesint.h"
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XserverRegion
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@@ -333,9 +334,17 @@ XFixesFetchRegionAndBounds (Display *dpy,
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bounds->y = rep.y;
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bounds->width = rep.width;
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bounds->height = rep.height;
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- nbytes = (long) rep.length << 2;
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- nrects = rep.length >> 1;
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- rects = Xmalloc (nrects * sizeof (XRectangle));
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+
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+ if (rep.length < (INT_MAX >> 2)) {
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+ nbytes = (long) rep.length << 2;
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+ nrects = rep.length >> 1;
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+ rects = Xmalloc (nrects * sizeof (XRectangle));
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+ } else {
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+ nbytes = 0;
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+ nrects = 0;
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+ rects = NULL;
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+ }
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+
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if (!rects)
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{
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_XEatDataWords(dpy, rep.length);
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--
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2.10.1
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