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glibc: Security fix for CVE-2016-4429

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Master will a have fix after pending update

(From OE-Core rev: c14f2ba7ae1ddef3dc7bb837454e51469bead948)

Signed-off-by: Armin Kuster <akuster@mvista.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Armin Kuster
2016-07-09 10:07:17 -07:00
committed by Richard Purdie
parent 22198f07af
commit d79f5a98f7
2 changed files with 90 additions and 0 deletions
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89
meta/recipes-core/glibc/glibc/CVE-2016-4429.patch Normal file
View File

@@ -0,0 +1,89 @@
From bc779a1a5b3035133024b21e2f339fe4219fb11c Mon Sep 17 00:00:00 2001
From: Florian Weimer <fweimer@redhat.com>
Date: Mon, 23 May 2016 20:18:34 +0200
Subject: [PATCH] CVE-2016-4429: sunrpc: Do not use alloca in clntudp_call [BZ
#20112]
The call is technically in a loop, and under certain circumstances
(which are quite difficult to reproduce in a test case), alloca
can be invoked repeatedly during a single call to clntudp_call.
As a result, the available stack space can be exhausted (even
though individual alloca sizes are bounded implicitly by what
can fit into a UDP packet, as a side effect of the earlier
successful send operation).
Upstream-Status: Backport
CVE: CVE-2016-4429
Signed-off-by: Armin Kuster <akuster@mvsita.com>
---
ChangeLog | 7 +++++++
NEWS | 4 ++++
sunrpc/clnt_udp.c | 10 +++++++++-
3 files changed, 20 insertions(+), 1 deletion(-)
Index: git/NEWS
===================================================================
--- git.orig/NEWS
+++ git/NEWS
@@ -110,6 +110,10 @@ Security related changes:
reporting the security impact of this issue, and Robert Holiday of
Ciena for reporting the related bug 18665. (CVE-2015-7547)
+* The Sun RPC UDP client could exhaust all available stack space when
+ flooded with crafted ICMP and UDP messages. Reported by Aldy Hernandez'
+ alloca plugin for GCC. (CVE-2016-4429)
+
The following bugs are resolved with this release:
[89] localedata: Locales nb_NO and nn_NO should transliterate æøå
Index: git/sunrpc/clnt_udp.c
===================================================================
--- git.orig/sunrpc/clnt_udp.c
+++ git/sunrpc/clnt_udp.c
@@ -388,9 +388,15 @@ send_again:
struct sock_extended_err *e;
struct sockaddr_in err_addr;
struct iovec iov;
- char *cbuf = (char *) alloca (outlen + 256);
+ char *cbuf = malloc (outlen + 256);
int ret;
+ if (cbuf == NULL)
+ {
+ cu->cu_error.re_errno = errno;
+ return (cu->cu_error.re_status = RPC_CANTRECV);
+ }
+
iov.iov_base = cbuf + 256;
iov.iov_len = outlen;
msg.msg_name = (void *) &err_addr;
@@ -415,10 +421,12 @@ send_again:
cmsg = CMSG_NXTHDR (&msg, cmsg))
if (cmsg->cmsg_level == SOL_IP && cmsg->cmsg_type == IP_RECVERR)
{
+ free (cbuf);
e = (struct sock_extended_err *) CMSG_DATA(cmsg);
cu->cu_error.re_errno = e->ee_errno;
return (cu->cu_error.re_status = RPC_CANTRECV);
}
+ free (cbuf);
}
#endif
do
Index: git/ChangeLog
===================================================================
--- git.orig/ChangeLog
+++ git/ChangeLog
@@ -1,3 +1,10 @@
+2016-05-23 Florian Weimer <fweimer@redhat.com>
+
+ CVE-2016-4429
+ [BZ #20112]
+ * sunrpc/clnt_udp.c (clntudp_call): Use malloc/free for the error
+ payload.
+
2016-04-29 Florian Weimer <fweimer@redhat.com>
[BZ #20010]

1
meta/recipes-core/glibc/glibc_2.23.bb
View File

@@ -37,6 +37,7 @@ SRC_URI = "${GLIBC_GIT_URI};branch=${SRCBRANCH};name=glibc \
file://0025-eglibc-Forward-port-cross-locale-generation-support.patch \
file://0026-When-disabling-SSE-make-sure-fpmath-is-not-set-to-us.patch \
file://CVE-2016-3706.patch \
file://CVE-2016-4429.patch \
"
SRC_URI += "\