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-rw-r--r--spec/ruby/security/cve_2018_8778_spec.rb10
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diff --git a/spec/ruby/security/cve_2018_8778_spec.rb b/spec/ruby/security/cve_2018_8778_spec.rb
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+++ b/spec/ruby/security/cve_2018_8778_spec.rb
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+require_relative '../spec_helper'
+
+describe "String#unpack" do
+ it "resists CVE-2018-8778 by raising an exception when a position indicator is larger than a native integer" do
+ pos = (1 << PlatformGuard::POINTER_SIZE) - 99
+ -> {
+ "0123456789".unpack("@#{pos}C10")
+ }.should.raise(RangeError, /pack length too big/)
+ end
+end