Re: [jethro][fido] libbsd: Secuirty fix CVE-2016-2090

[Martin Jansa <martin.jansa@gmail.com>]

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On Thu, Feb 11, 2016 at 04:20:34PM -0800, Armin Kuster wrote:
> From: Armin Kuster <akuster@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@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@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
> +
> 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@lists.openembedded.org
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-- 
Martin 'JaMa' Jansa     jabber: Martin.Jansa@gmail.com

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