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gnu: libxvmc: Fix CVE-2016-7953.

* gnu/packages/patches/libxvmc-CVE-2016-7953.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/xorg.scm (libxvmc)[replacement]: New field.
(libxvmc/fixed): New variable.
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Leo Famulari 6 years ago
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commit
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  1. 1
      gnu/local.mk
  2. 42
      gnu/packages/patches/libxvmc-CVE-2016-7953.patch
  3. 8
      gnu/packages/xorg.scm

1
gnu/local.mk

@ -678,6 +678,7 @@ dist_patch_DATA = \
%D%/packages/patches/libxrender-CVE-2016-7950.patch \
%D%/packages/patches/libxtst-CVE-2016-7951-CVE-2016-7952.patch \
%D%/packages/patches/libxv-CVE-2016-5407.patch \
%D%/packages/patches/libxvmc-CVE-2016-7953.patch \
%D%/packages/patches/libxslt-generated-ids.patch \
%D%/packages/patches/lirc-localstatedir.patch \
%D%/packages/patches/llvm-for-extempore.patch \

42
gnu/packages/patches/libxvmc-CVE-2016-7953.patch

@ -0,0 +1,42 @@
Fix CVE-2016-7953:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-7953
Patch copied from upstream source repository:
https://cgit.freedesktop.org/xorg/lib/libXvMC/commit/?id=2cd95e7da8367cccdcdd5c9b160012d1dec5cbdb
From 2cd95e7da8367cccdcdd5c9b160012d1dec5cbdb Mon Sep 17 00:00:00 2001
From: Tobias Stoeckmann <tobias@stoeckmann.org>
Date: Sun, 25 Sep 2016 22:34:27 +0200
Subject: [PATCH] Avoid buffer underflow on empty strings.
If an empty string is received from an x-server, do not underrun the
buffer by accessing "rep.nameLen - 1" unconditionally, which could end
up being -1.
Signed-off-by: Tobias Stoeckmann <tobias@stoeckmann.org>
Reviewed-by: Matthieu Herrb <matthieu@herrb.eu>
---
src/XvMC.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/src/XvMC.c b/src/XvMC.c
index 7336760..3ee4212 100644
--- a/src/XvMC.c
+++ b/src/XvMC.c
@@ -576,9 +576,9 @@ Status XvMCGetDRInfo(Display *dpy, XvPortID port,
if (*name && *busID && tmpBuf) {
_XRead(dpy, tmpBuf, realSize);
strncpy(*name,tmpBuf,rep.nameLen);
- (*name)[rep.nameLen - 1] = '\0';
+ (*name)[rep.nameLen == 0 ? 0 : rep.nameLen - 1] = '\0';
strncpy(*busID,tmpBuf+rep.nameLen,rep.busIDLen);
- (*busID)[rep.busIDLen - 1] = '\0';
+ (*busID)[rep.busIDLen == 0 ? 0 : rep.busIDLen - 1] = '\0';
XFree(tmpBuf);
} else {
XFree(*name);
--
2.10.1

8
gnu/packages/xorg.scm

@ -4998,6 +4998,7 @@ new API's in libXft, or the legacy API's in libX11.")
(define-public libxvmc
(package
(name "libxvmc")
(replacement libxvmc/fixed)
(version "1.0.9")
(source
(origin
@ -5023,6 +5024,13 @@ new API's in libXft, or the legacy API's in libX11.")
(description "Xorg XvMC library.")
(license license:x11)))
(define libxvmc/fixed
(package
(inherit libxvmc)
(source (origin
(inherit (package-source libxvmc))
(patches (search-patches
"libxvmc-CVE-2016-7953.patch"))))))
(define-public libxxf86vm
(package

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