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GNU C Library master sources branch release/2.23/master updated. glibc-2.23-59-gbdce959
- From: fw at sourceware dot org
- To: glibc-cvs at sourceware dot org
- Date: 24 May 2016 09:21:33 -0000
- Subject: GNU C Library master sources branch release/2.23/master updated. glibc-2.23-59-gbdce959
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- Log -----------------------------------------------------------------
http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=bdce95930e1d9a7d013d1ba78740243491262879
commit bdce95930e1d9a7d013d1ba78740243491262879
Author: Florian Weimer <fweimer@redhat.com>
Date: Mon May 23 20:18:34 2016 +0200
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).
(cherry picked from commit bc779a1a5b3035133024b21e2f339fe4219fb11c)
diff --git a/ChangeLog b/ChangeLog
index 9fd40c7..006e851 100644
--- a/ChangeLog
+++ b/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.
+
2016-05-13 Florian Weimer <fweimer@redhat.com>
Fix race condition in tst-mallocfork2, use fewer resources.
diff --git a/NEWS b/NEWS
index 9c1c638..532cfe2 100644
--- a/NEWS
+++ b/NEWS
@@ -18,6 +18,10 @@ 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:
[19679] gcc-4.9.3 C++ exception handling broken due to unaligned stack
diff --git a/sunrpc/clnt_udp.c b/sunrpc/clnt_udp.c
index a6cf5f1..4d9acb1 100644
--- a/sunrpc/clnt_udp.c
+++ b/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
-----------------------------------------------------------------------
Summary of changes:
ChangeLog | 7 +++++++
NEWS | 4 ++++
sunrpc/clnt_udp.c | 10 +++++++++-
3 files changed, 20 insertions(+), 1 deletions(-)
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