fix CVE-2020-8597

ppp-CVE-2020-8597.patch

@@ -0,0 +1,40 @@
+From ab6e265950d447cd143cef40a340daac81fe0127 Mon Sep 17 00:00:00 2001
+From: Paul Mackerras <paulus@ozlabs.org>
+Date: Mon, 3 Feb 2020 15:53:28 +1100
+Subject: [PATCH] pppd: Fix bounds check in EAP code
+
+Given that we have just checked vallen < len, it can never be the case
+that vallen >= len + sizeof(rhostname).  This fixes the check so we
+actually avoid overflowing the rhostname array.
+
+Reported-by: Ilja Van Sprundel <ivansprundel@ioactive.com>
+Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
+---
+ pppd/eap.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/pppd/eap.c b/pppd/eap.c
+index 99fb0d9..6309e1b 100644
+--- a/pppd/eap.c
++++ b/pppd/eap.c
+@@ -1661,7 +1661,7 @@ int len;
+ 		}
+ 
+ 		/* Not so likely to happen. */
+-		if (vallen >= len + sizeof (rhostname)) {
++		if (len - vallen >= sizeof (rhostname)) {
+ 			dbglog("EAP: trimming really long peer name down");
+ 			BCOPY(inp + vallen, rhostname, sizeof (rhostname) - 1);
+ 			rhostname[sizeof (rhostname) - 1] = '\0';
+@@ -2251,7 +2251,7 @@ int len;
+ 		}
+ 
+ 		/* Not so likely to happen. */
+-		if (vallen >= len + sizeof (rhostname)) {
++		if (len - vallen >= sizeof (rhostname)) {
+ 			dbglog("EAP: trimming really long peer name down");
+ 			BCOPY(inp + vallen, rhostname, sizeof (rhostname) - 1);
+ 			rhostname[sizeof (rhostname) - 1] = '\0';
+-- 
+1.8.3.1
+

ppp.spec

@@ -1,6 +1,6 @@
 Name:           ppp
 Version:        2.4.7
-Release:        28
+Release:        29
 Summary:        The Point-to-Point Protocol
 
 License:        BSD and LGPLv2+ and GPLv2+ and Public Domain
@@ -59,6 +59,7 @@ Patch0028:      0028-pppoe-include-netinet-in.h-before-linux-in.h.patch
 Patch0029:      ppp-2.4.7-DES-openssl.patch
 Patch0030:      ppp-2.4.7-honor-ldflags.patch
 Patch6000:      ppp-CVE-2015-3310.patch
+Patch6001:      ppp-CVE-2020-8597.patch
 
 %description
 The Point-to-Point Protocol (PPP) provides a standard way to establish
@@ -151,6 +152,12 @@ install -m 644 -p %{SOURCE12} %{buildroot}%{_prefix}/lib/tmpfiles.d/ppp.conf
 %{_mandir}/man8/*.8.gz
 
 %changelog
+* Tue Mar 17 2020 chenzhen <chenzhen44@huawei.com> - 2.4.7-29
+- Type:cves
+- ID:CVE-2020-8597
+- SUG:restart
+- DESC:fix CVE-2020-8597
+
 * Fri Dec 20 2019 openEuler Buildteam <buildteam@openeuler.org> - 2.4.7-28
 - Type:cves
 - ID:CVE-2015-3310