[OE-core] [jethro][fido] libbsd: Secuirty fix CVE-2016-2090
Martin Jansa
martin.jansa at gmail.com
Fri Feb 12 13:14:15 UTC 2016
On Thu, Feb 11, 2016 at 04:20:34PM -0800, Armin Kuster wrote:
> From: Armin Kuster <akuster at mvista.com>
>
> CVE-2016-2090 Heap buffer overflow in fgetwln function of libbsd
typo in subject
>
> affects libbsd <= 0.8.1
>
> Signed-off-by: Armin Kuster <akuster at mvista.com>
> ---
> .../libbsd/files/CVE-2016-2090.patch | 50 ++++++++++++++++++++++
> meta/recipes-support/libbsd/libbsd_0.7.0.bb | 4 +-
> 2 files changed, 53 insertions(+), 1 deletion(-)
> create mode 100644 meta/recipes-support/libbsd/files/CVE-2016-2090.patch
>
> diff --git a/meta/recipes-support/libbsd/files/CVE-2016-2090.patch b/meta/recipes-support/libbsd/files/CVE-2016-2090.patch
> new file mode 100644
> index 0000000..2eaae13
> --- /dev/null
> +++ b/meta/recipes-support/libbsd/files/CVE-2016-2090.patch
> @@ -0,0 +1,50 @@
> +From c8f0723d2b4520bdd6b9eb7c3e7976de726d7ff7 Mon Sep 17 00:00:00 2001
> +From: Hanno Boeck <hanno at 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 at hadrons.org>
> +
> +Upstream-Status: Backport
> +http://cgit.freedesktop.org/libbsd/commit/?id=c8f0723d2b4520bdd6b9eb7c3e7976de726d7ff7
> +
> +CVE: CVE-2016-2090
> +Signed-off-by: Armin Kuster <akuster at 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
> +
> diff --git a/meta/recipes-support/libbsd/libbsd_0.7.0.bb b/meta/recipes-support/libbsd/libbsd_0.7.0.bb
> index 902666d..8d9a708 100644
> --- a/meta/recipes-support/libbsd/libbsd_0.7.0.bb
> +++ b/meta/recipes-support/libbsd/libbsd_0.7.0.bb
> @@ -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"
> --
> 2.3.5
>
> --
> _______________________________________________
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> Openembedded-core at lists.openembedded.org
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--
Martin 'JaMa' Jansa jabber: Martin.Jansa at gmail.com
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