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libbsd: Security fix CVE-2016-2090

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CVE-2016-2090 Heap buffer overflow in fgetwln function of libbsd

affects libbsd <= 0.8.1 (and therefore not needed in master)

(From OE-Core rev: e56aba3a822f072f8ed2062a691762a4a970a3f0)

Signed-off-by: Armin Kuster <akuster@mvista.com>
Signed-off-by: Joshua Lock <joshua.g.lock@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Armin Kuster
2016-02-11 16:20:34 -08:00
committed by Richard Purdie
parent eb9666a3e2
commit ae57ea03c6
2 changed files with 53 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

50
meta/recipes-support/libbsd/files/CVE-2016-2090.patch Normal file
View File

@@ -0,0 +1,50 @@
From c8f0723d2b4520bdd6b9eb7c3e7976de726d7ff7 Mon Sep 17 00:00:00 2001
From: Hanno Boeck <hanno@hboeck.de>
Date: Wed, 27 Jan 2016 15:10:11 +0100
Subject: [PATCH] Fix heap buffer overflow in fgetwln()
In the function fgetwln() there's a 4 byte heap overflow.
There is a while loop that has this check to see whether there's still
enough space in the buffer:
if (!fb->len || wused > fb->len) {
If this is true more memory gets allocated. However this test won't be
true if wused == fb->len, but at that point wused already points out
of the buffer. Some lines later there's a write to the buffer:
fb->wbuf[wused++] = wc;
This bug was found with the help of address sanitizer.
Warned-by: ASAN
Fixes: https://bugs.freedesktop.org/show_bug.cgi?id=93881
Signed-off-by: Guillem Jover <guillem@hadrons.org>
Upstream-Status: Backport
http://cgit.freedesktop.org/libbsd/commit/?id=c8f0723d2b4520bdd6b9eb7c3e7976de726d7ff7
CVE: CVE-2016-2090
Signed-off-by: Armin Kuster <akuster@mvista.com>
---
src/fgetwln.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/src/fgetwln.c b/src/fgetwln.c
index 9ee0776..aa3f927 100644
--- a/src/fgetwln.c
+++ b/src/fgetwln.c
@@ -60,7 +60,7 @@ fgetwln(FILE *stream, size_t *lenp)
fb->fp = stream;
while ((wc = fgetwc(stream)) != WEOF) {
- if (!fb->len || wused > fb->len) {
+ if (!fb->len || wused >= fb->len) {
wchar_t *wp;
if (fb->len)
--
2.3.5

4
meta/recipes-support/libbsd/libbsd_0.7.0.bb
View File

@@ -13,7 +13,9 @@ LIC_FILES_CHKSUM = "file://COPYING;md5=f1530ea92aeaa1c5e2547cfd43905d8c"
SECTION = "libs"
DEPENDS = ""
SRC_URI = "http://libbsd.freedesktop.org/releases/${BPN}-${PV}.tar.xz"
SRC_URI = "http://libbsd.freedesktop.org/releases/${BPN}-${PV}.tar.xz \
file://CVE-2016-2090.patch \
"
SRC_URI[md5sum] = "fcceb4e66fd448ca4ed42ba22a8babb0"
SRC_URI[sha256sum] = "0f3b0e17e5c34c038126e0a04351b11e23c6101a7d0ce3beeab29bb6415c10bb"