File CVE-2022-27777.patch of Package rubygem-activesupport-5_1.26200

diff --git a/activesupport/lib/active_support/core_ext/string/output_safety.rb b/activesupport/lib/active_support/core_ext/string/output_safety.rb
index f3bdc2977e6e6..7a9fecf5e923e 100644
--- a/activesupport/lib/active_support/core_ext/string/output_safety.rb
+++ b/activesupport/lib/active_support/core_ext/string/output_safety.rb
@@ -12,6 +12,14 @@ module Util
     HTML_ESCAPE_ONCE_REGEXP = /["><']|&(?!([a-zA-Z]+|(#\d+)|(#[xX][\dA-Fa-f]+));)/
     JSON_ESCAPE_REGEXP = /[\u2028\u2029&><]/u
 
+    # Following XML requirements: https://www.w3.org/TR/REC-xml/#NT-Name
+    TAG_NAME_START_REGEXP_SET = ":A-Z_a-z\u{C0}-\u{D6}\u{D8}-\u{F6}\u{F8}-\u{2FF}\u{370}-\u{37D}\u{37F}-\u{1FFF}" \
+                                "\u{200C}-\u{200D}\u{2070}-\u{218F}\u{2C00}-\u{2FEF}\u{3001}-\u{D7FF}\u{F900}-\u{FDCF}" \
+                                "\u{FDF0}-\u{FFFD}\u{10000}-\u{EFFFF}"
+    TAG_NAME_START_REGEXP = /[^#{TAG_NAME_START_REGEXP_SET}]/
+    TAG_NAME_FOLLOWING_REGEXP = /[^#{TAG_NAME_START_REGEXP_SET}\-.0-9\u{B7}\u{0300}-\u{036F}\u{203F}-\u{2040}]/
+    TAG_NAME_REPLACEMENT_CHAR = "_"
+
     # A utility method for escaping HTML tag characters.
     # This method is also aliased as <tt>h</tt>.
     #
@@ -116,6 +124,26 @@ def json_escape(s)
     end
 
     module_function :json_escape
+
+    # A utility method for escaping XML names of tags and names of attributes.
+    #
+    #   xml_name_escape('1 < 2 & 3')
+    #   # => "1___2___3"
+    #
+    # It follows the requirements of the specification: https://www.w3.org/TR/REC-xml/#NT-Name
+    def xml_name_escape(name)
+      name = name.to_s
+      return "" if name.blank?
+
+      starting_char = name[0].gsub(TAG_NAME_START_REGEXP, TAG_NAME_REPLACEMENT_CHAR)
+
+      return starting_char if name.size == 1
+
+      following_chars = name[1..-1].gsub(TAG_NAME_FOLLOWING_REGEXP, TAG_NAME_REPLACEMENT_CHAR)
+
+      starting_char + following_chars
+    end
+    module_function :xml_name_escape
   end
 end