diff options
Diffstat (limited to 'gnu/packages/patches/libxrender-CVE-2016-7949.patch')
| -rw-r--r-- | gnu/packages/patches/libxrender-CVE-2016-7949.patch | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/gnu/packages/patches/libxrender-CVE-2016-7949.patch b/gnu/packages/patches/libxrender-CVE-2016-7949.patch new file mode 100644 index 0000000000..3a2be4ea8e --- /dev/null +++ b/gnu/packages/patches/libxrender-CVE-2016-7949.patch @@ -0,0 +1,66 @@ +Fix CVE-2016-7949: + +https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-7949 + +Patch copied from upstream source repository: + +https://cgit.freedesktop.org/xorg/lib/libXrender/commit/?id=9362c7ddd1af3b168953d0737877bc52d79c94f4 + +From 9362c7ddd1af3b168953d0737877bc52d79c94f4 Mon Sep 17 00:00:00 2001 +From: Tobias Stoeckmann <tobias@stoeckmann.org> +Date: Sun, 25 Sep 2016 21:43:09 +0200 +Subject: [PATCH] Validate lengths while parsing server data. + +Individual lengths inside received server data can overflow +the previously reserved memory. + +It is therefore important to validate every single length +field to not overflow the previously agreed sum of all invidual +length fields. + +v2: consume remaining bytes in the reply buffer on error. + +Signed-off-by: Tobias Stoeckmann <tobias@stoeckmann.org> +Reviewed-by: Matthieu Herrb@laas.fr +--- + src/Xrender.c | 18 ++++++++++++++++++ + 1 file changed, 18 insertions(+) + +diff --git a/src/Xrender.c b/src/Xrender.c +index 3102eb2..71cf3e6 100644 +--- a/src/Xrender.c ++++ b/src/Xrender.c +@@ -533,12 +533,30 @@ XRenderQueryFormats (Display *dpy) + screen->fallback = _XRenderFindFormat (xri, xScreen->fallback); + screen->subpixel = SubPixelUnknown; + xDepth = (xPictDepth *) (xScreen + 1); ++ if (screen->ndepths > rep.numDepths) { ++ Xfree (xri); ++ Xfree (xData); ++ _XEatDataWords (dpy, rep.length); ++ UnlockDisplay (dpy); ++ SyncHandle (); ++ return 0; ++ } ++ rep.numDepths -= screen->ndepths; + for (nd = 0; nd < screen->ndepths; nd++) + { + depth->depth = xDepth->depth; + depth->nvisuals = xDepth->nPictVisuals; + depth->visuals = visual; + xVisual = (xPictVisual *) (xDepth + 1); ++ if (depth->nvisuals > rep.numVisuals) { ++ Xfree (xri); ++ Xfree (xData); ++ _XEatDataWords (dpy, rep.length); ++ UnlockDisplay (dpy); ++ SyncHandle (); ++ return 0; ++ } ++ rep.numVisuals -= depth->nvisuals; + for (nv = 0; nv < depth->nvisuals; nv++) + { + visual->visual = _XRenderFindVisual (dpy, xVisual->visual); +-- +2.10.1 + |