Add compress/bzip2 taint tracking

Author: gagliardetto

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

@@ -7,6 +7,7 @@ import semmle.go.frameworks.stdlib.ArchiveTar
 import semmle.go.frameworks.stdlib.ArchiveZip
 import semmle.go.frameworks.stdlib.Bufio
 import semmle.go.frameworks.stdlib.Bytes
+import semmle.go.frameworks.stdlib.CompressBzip2
 
 /** A `String()` method. */
 class StringMethod extends TaintTracking::FunctionModel, Method {

ql/src/semmle/go/frameworks/stdlib/CompressBzip2.qll

@@ -0,0 +1,23 @@
+/**
+ * Provides classes modeling security-relevant aspects of the `compress/bzip2` package.
+ */
+
+import go
+
+/** Provides models of commonly used functions in the `compress/bzip2` package. */
+module CompressBzip2 {
+  private class FunctionModels extends TaintTracking::FunctionModel {
+    FunctionInput inp;
+    FunctionOutput outp;
+
+    FunctionModels() {
+      // signature: func NewReader(r io.Reader) io.Reader
+      hasQualifiedName("compress/bzip2", "NewReader") and
+      (inp.isParameter(0) and outp.isResult())
+    }
+
+    override predicate hasTaintFlow(FunctionInput input, FunctionOutput output) {
+      input = inp and output = outp
+    }
+  }
+}