Bump linux buildroot (#1032)

* Update buildroot to 2020.11-rc3

Signed-off-by: Stefan Agner <stefan@agner.ch>

* ODROID: Update kernel 5.9.11

* Remove patch which has been applied upstream

* Linux: Update kernel 5.4.80

buildroot/package/xinetd/0005-CVE-2013-4342-xinetd-ignores-user-and-group-directiv.patch

@@ -0,0 +1,29 @@
+From 91e2401a219121eae15244a6b25d2e79c1af5864 Mon Sep 17 00:00:00 2001
+From: Thomas Swan <thomas.swan@gmail.com>
+Date: Wed, 2 Oct 2013 23:17:17 -0500
+Subject: [PATCH] CVE-2013-4342: xinetd: ignores user and group directives for
+ TCPMUX services
+
+Originally reported to Debian in 2005 <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=324678> and rediscovered <https://bugzilla.redhat.com/show_bug.cgi?id=1006100>, xinetd would execute TCPMUX services without dropping privilege to match the service configuration allowing the service to run with same privilege as the xinetd process (root).
+
+Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
+---
+ xinetd/builtins.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/xinetd/builtins.c b/xinetd/builtins.c
+index 3b85579..34a5bac 100644
+--- a/xinetd/builtins.c
++++ b/xinetd/builtins.c
+@@ -617,7 +617,7 @@ static void tcpmux_handler( const struct server *serp )
+    if( SC_IS_INTERNAL( scp ) ) {
+       SC_INTERNAL(scp, nserp);
+    } else {
+-      exec_server(nserp);
++      child_process(nserp);
+    }
+ }
+ 
+-- 
+2.20.1
+

buildroot/package/xinetd/xinetd.mk

@@ -9,6 +9,9 @@ XINETD_SITE = $(call github,xinetd-org,xinetd,xinetd-$(XINETD_VERSION))
 XINETD_LICENSE = xinetd license
 XINETD_LICENSE_FILES = COPYRIGHT
 
+# 0005-CVE-2013-4342-xinetd-ignores-user-and-group-directiv.patch
+XINETD_IGNORE_CVES += CVE-2013-4342
+
 XINETD_CFLAGS = $(TARGET_CFLAGS)
 
 # Three cases here: