Add taint-tracking for container/ring package

Author: gagliardetto

ql/src/semmle/go/frameworks/Stdlib.qll

@@ -14,6 +14,7 @@ import semmle.go.frameworks.stdlib.CompressLzw
 import semmle.go.frameworks.stdlib.CompressZlib
 import semmle.go.frameworks.stdlib.ContainerHeap
 import semmle.go.frameworks.stdlib.ContainerList
+import semmle.go.frameworks.stdlib.ContainerRing
 import semmle.go.frameworks.stdlib.Mime
 import semmle.go.frameworks.stdlib.MimeMultipart
 import semmle.go.frameworks.stdlib.MimeQuotedprintable

ql/src/semmle/go/frameworks/stdlib/ContainerRing.qll

@@ -0,0 +1,39 @@
+/**
+ * Provides classes modeling security-relevant aspects of the `container/ring` package.
+ */
+
+import go
+
+/** Provides models of commonly used functions in the `container/ring` package. */
+module ContainerRing {
+  private class MethodModels extends TaintTracking::FunctionModel, Method {
+    FunctionInput inp;
+    FunctionOutput outp;
+
+    MethodModels() {
+      // signature: func (*Ring).Link(s *Ring) *Ring
+      this.hasQualifiedName("container/ring", "Ring", "Link") and
+      (inp.isParameter(0) and outp.isResult())
+      or
+      // signature: func (*Ring).Move(n int) *Ring
+      this.hasQualifiedName("container/ring", "Ring", "Move") and
+      (inp.isReceiver() and outp.isResult())
+      or
+      // signature: func (*Ring).Next() *Ring
+      this.hasQualifiedName("container/ring", "Ring", "Next") and
+      (inp.isReceiver() and outp.isResult())
+      or
+      // signature: func (*Ring).Prev() *Ring
+      this.hasQualifiedName("container/ring", "Ring", "Prev") and
+      (inp.isReceiver() and outp.isResult())
+      or
+      // signature: func (*Ring).Unlink(n int) *Ring
+      this.hasQualifiedName("container/ring", "Ring", "Unlink") and
+      (inp.isReceiver() and outp.isResult())
+    }
+
+    override predicate hasTaintFlow(FunctionInput input, FunctionOutput output) {
+      input = inp and output = outp
+    }
+  }
+}