Add taint-tracking for package sort

Author: gagliardetto

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

@@ -20,6 +20,7 @@ import semmle.go.frameworks.stdlib.PathFilepath
 import semmle.go.frameworks.stdlib.Reflect
 import semmle.go.frameworks.stdlib.Strconv
 import semmle.go.frameworks.stdlib.Strings
+import semmle.go.frameworks.stdlib.Sort
 import semmle.go.frameworks.stdlib.TextScanner
 import semmle.go.frameworks.stdlib.TextTabwriter
 import semmle.go.frameworks.stdlib.TextTemplate

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

@@ -0,0 +1,23 @@
+/**
+ * Provides classes modeling security-relevant aspects of the `sort` package.
+ */
+
+import go
+
+/** Provides models of commonly used functions in the `sort` package. */
+module Sort {
+  private class FunctionModels extends TaintTracking::FunctionModel {
+    FunctionInput inp;
+    FunctionOutput outp;
+
+    FunctionModels() {
+      // signature: func Reverse(data Interface) Interface
+      hasQualifiedName("sort", "Reverse") and
+      (inp.isParameter(0) and outp.isResult())
+    }
+
+    override predicate hasTaintFlow(FunctionInput input, FunctionOutput output) {
+      input = inp and output = outp
+    }
+  }
+}