[OE-core] [master][PATCH] glibc: CVE-2016-4429
akuster808
akuster808 at gmail.com
Sat Jul 9 17:25:31 UTC 2016
On 07/08/2016 04:08 PM, Khem Raj wrote:
> On Fri, Jul 8, 2016 at 3:48 PM, Armin Kuster <akuster808 at gmail.com> wrote:
>> From: Armin Kuster <akuster at mvista.com>
>>
>> Signed-off-by: Armin Kuster <akuster at mvisa.com>
>> ---
>> meta/recipes-core/glibc/glibc/CVE-2016-4429.patch | 86 +++++++++++++++++++++++
>> meta/recipes-core/glibc/glibc_2.24.bb | 1 +
>> 2 files changed, 87 insertions(+)
>> create mode 100644 meta/recipes-core/glibc/glibc/CVE-2016-4429.patch
>>
>> diff --git a/meta/recipes-core/glibc/glibc/CVE-2016-4429.patch b/meta/recipes-core/glibc/glibc/CVE-2016-4429.patch
>> new file mode 100644
>> index 0000000..074c60d
>> --- /dev/null
>> +++ b/meta/recipes-core/glibc/glibc/CVE-2016-4429.patch
>> @@ -0,0 +1,86 @@
>> +From bc779a1a5b3035133024b21e2f339fe4219fb11c Mon Sep 17 00:00:00 2001
>> +From: Florian Weimer <fweimer at 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).
>
> this should be covered with latest pull I have sent especially this patch
> https://patchwork.openembedded.org/patch/126637/
>
> would be nice if you could test this one out.
This fix in the update you have submitted for master.
This is one of those "Do I fix master knowing updates are imitate."
quandaries. Time to address stable branches.
- armin
>
>> +---
>> + ChangeLog | 7 +++++++
>> + NEWS | 4 ++++
>> + sunrpc/clnt_udp.c | 10 +++++++++-
>> + 3 files changed, 20 insertions(+), 1 deletion(-)
>> +
>> +Upstream-Status: Backport
>> +CVE: CVE-2016-4429
>> +Signed-of-by: Armin Kuster <akuster at mvista.com>
>> +
>> +Index: git/ChangeLog
>> +===================================================================
>> +--- git.orig/ChangeLog
>> ++++ git/ChangeLog
>> +@@ -1,3 +1,9 @@
>> ++2016-05-23 Florian Weimer <fweimer at redhat.com>
>> ++ CVE-2016-4429
>> ++ [BZ #20112]
>> ++ * sunrpc/clnt_udp.c (clntudp_call): Use malloc/free for the error
>> ++ payload.
>> ++
>> + 2016-05-11 Florian Weimer <fweimer at redhat.com>
>> +
>> + Do not use mcheck in localedef.
>> +Index: git/NEWS
>> +===================================================================
>> +--- git.orig/NEWS
>> ++++ git/NEWS
>> +@@ -48,6 +48,10 @@ Security related changes:
>> + called with the GLOB_ALTDIRFUNC flag and encountered a long file name.
>> + Reported by Alexander Cherepanov. (CVE-2016-1234)
>> +
>> ++* 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:
>> +
>> + [The release manager will add the list generated by
>> +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
>> diff --git a/meta/recipes-core/glibc/glibc_2.24.bb b/meta/recipes-core/glibc/glibc_2.24.bb
>> index 77630e3..c2a31e0 100644
>> --- a/meta/recipes-core/glibc/glibc_2.24.bb
>> +++ b/meta/recipes-core/glibc/glibc_2.24.bb
>> @@ -37,6 +37,7 @@ SRC_URI = "${GLIBC_GIT_URI};branch=${SRCBRANCH};name=glibc \
>> file://0023-eglibc-Install-PIC-archives.patch \
>> file://0024-eglibc-Forward-port-cross-locale-generation-support.patch \
>> file://0025-Define-DUMMY_LOCALE_T-if-not-defined.patch \
>> + file://CVE-2016-4429.patch \
>> "
>>
>> SRC_URI += "\
>> --
>> 2.3.5
>>
>> --
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