ruby: security fix CVE 2018-1000073

Directory traversal vulnerability as described by
https://nvd.nist.gov/vuln/detail/CVE-2018-1000073.

(From OE-Core rev: 1a0a1785766c12003e3f8848852af84cae203e6b)

Signed-off-by: Joe Slater <joe.slater@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/ruby/ruby/CVE-2018-1000073.patch

@@ -0,0 +1,34 @@
+From 1b931fc03b819b9a0214be3eaca844ef534175e2 Mon Sep 17 00:00:00 2001
+From: Jonathan Claudius <jclaudius@mozilla.com>
+Date: Wed, 7 Feb 2018 23:54:52 -0500
+Subject: [PATCH] Non-working patch for deducing symlinked base-dirs
+
+---
+CVE: CVE-2018-1000073
+
+Fixed in ruby 2.7.6.
+
+Upstream-Status: Backport [github.com/rubygems/rubygems/commit/1b931fc...]
+
+Signed-off-by: Joe Slater <joe.slater@windriver.com>
+
+---
+ lib/rubygems/package.rb |    2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/lib/rubygems/package.rb b/lib/rubygems/package.rb
+index dede959..cb9c74a 100644
+--- a/lib/rubygems/package.rb
++++ b/lib/rubygems/package.rb
+@@ -421,6 +421,8 @@ EOM
+     destination_dir = File.expand_path destination_dir
+ 
+     destination = File.join destination_dir, filename
++    destination = File.realpath destination if
++      File.respond_to? :realpath
+     destination = File.expand_path destination
+ 
+     raise Gem::Package::PathError.new(destination, destination_dir) unless
+-- 
+1.7.9.5
+

meta/recipes-devtools/ruby/ruby_2.5.1.bb

@@ -3,6 +3,7 @@ require ruby.inc
 SRC_URI += " \
            file://ruby-CVE-2017-9226.patch \
            file://ruby-CVE-2017-9228.patch \
+           file://CVE-2018-1000073.patch \
            "
 
 SRC_URI[md5sum] = "23867bc8c16c55e43b14dfe0614bcfa8"