Avoid platform-specific results

These were introduced in github#12750 but
the relevant tests that should have caught it weren't run.

Author: owen-mc

go/ql/test/library-tests/semmle/go/dataflow/FlowSteps/LocalTaintStep.expected

@@ -73,7 +73,6 @@
 | file://:0:0:0:0 | parameter 0 of Store | file://:0:0:0:0 | [summary] to write: argument -1 in Store |
 | file://:0:0:0:0 | parameter 0 of StringBytePtr | file://:0:0:0:0 | [summary] to write: return (return[0]) in StringBytePtr |
 | file://:0:0:0:0 | parameter 0 of StringByteSlice | file://:0:0:0:0 | [summary] to write: return (return[0]) in StringByteSlice |
-| file://:0:0:0:0 | parameter 0 of StringSlicePtr | file://:0:0:0:0 | [summary] to write: return (return[0]) in StringSlicePtr |
 | file://:0:0:0:0 | parameter 0 of Sub | file://:0:0:0:0 | [summary] to write: return (return[0]) in Sub |
 | file://:0:0:0:0 | parameter 0 of Swap | file://:0:0:0:0 | [summary] to write: argument -1 in Swap |
 | file://:0:0:0:0 | parameter 0 of Swap | file://:0:0:0:0 | [summary] to write: argument -1 in Swap |
@@ -184,7 +183,6 @@
 | file://:0:0:0:0 | parameter -1 of Info | file://:0:0:0:0 | [summary] to write: return (return[0]) in Info |
 | file://:0:0:0:0 | parameter -1 of Info | file://:0:0:0:0 | [summary] to write: return (return[0]) in Info |
 | file://:0:0:0:0 | parameter -1 of Info | file://:0:0:0:0 | [summary] to write: return (return[0]) in Info |
-| file://:0:0:0:0 | parameter -1 of Info | file://:0:0:0:0 | [summary] to write: return (return[0]) in Info |
 | file://:0:0:0:0 | parameter -1 of Interface | file://:0:0:0:0 | [summary] to write: return (return[0]) in Interface |
 | file://:0:0:0:0 | parameter -1 of InterfaceData | file://:0:0:0:0 | [summary] to write: return (return[0]) in InterfaceData |
 | file://:0:0:0:0 | parameter -1 of Key | file://:0:0:0:0 | [summary] to write: return (return[0]) in Key |
@@ -203,7 +201,6 @@
 | file://:0:0:0:0 | parameter -1 of Name | file://:0:0:0:0 | [summary] to write: return (return[0]) in Name |
 | file://:0:0:0:0 | parameter -1 of Name | file://:0:0:0:0 | [summary] to write: return (return[0]) in Name |
 | file://:0:0:0:0 | parameter -1 of Name | file://:0:0:0:0 | [summary] to write: return (return[0]) in Name |
-| file://:0:0:0:0 | parameter -1 of Name | file://:0:0:0:0 | [summary] to write: return (return[0]) in Name |
 | file://:0:0:0:0 | parameter -1 of Open | file://:0:0:0:0 | [summary] to write: return (return[0]) in Open |
 | file://:0:0:0:0 | parameter -1 of Open | file://:0:0:0:0 | [summary] to write: return (return[0]) in Open |
 | file://:0:0:0:0 | parameter -1 of Open | file://:0:0:0:0 | [summary] to write: return (return[0]) in Open |

go/ql/test/library-tests/semmle/go/dataflow/FlowSteps/LocalTaintStep.ql

@@ -4,5 +4,17 @@ from DataFlow::Node nd, DataFlow::Node succ
 where
   TaintTracking::localTaintStep(nd, succ) and
   // exclude data-flow steps
-  not DataFlow::localFlowStep(nd, succ)
+  not DataFlow::localFlowStep(nd, succ) and
+  // Exclude results which only appear on unix to avoid platform-specific results
+  not exists(string pkg, string name |
+    nd.(DataFlow::SummarizedParameterNode)
+        .getCallable()
+        .asSummarizedCallable()
+        .asFunction()
+        .hasQualifiedName(pkg, name)
+  |
+    pkg = "syscall" and name = "StringSlicePtr"
+    or
+    pkg = ["os.dirEntry", "os.unixDirent"] and name = ["Info", "Name"]
+  )
 select nd, succ

go/ql/test/library-tests/semmle/go/frameworks/TaintSteps/TaintStep.expected

@@ -191,7 +191,6 @@
 | file://:0:0:0:0 | parameter 0 of Store | file://:0:0:0:0 | [summary] to write: argument -1 in Store |
 | file://:0:0:0:0 | parameter 0 of StringBytePtr | file://:0:0:0:0 | [summary] to write: return (return[0]) in StringBytePtr |
 | file://:0:0:0:0 | parameter 0 of StringByteSlice | file://:0:0:0:0 | [summary] to write: return (return[0]) in StringByteSlice |
-| file://:0:0:0:0 | parameter 0 of StringSlicePtr | file://:0:0:0:0 | [summary] to write: return (return[0]) in StringSlicePtr |
 | file://:0:0:0:0 | parameter 0 of Sub | file://:0:0:0:0 | [summary] to write: return (return[0]) in Sub |
 | file://:0:0:0:0 | parameter 0 of Swap | file://:0:0:0:0 | [summary] to write: argument -1 in Swap |
 | file://:0:0:0:0 | parameter 0 of Swap | file://:0:0:0:0 | [summary] to write: argument -1 in Swap |
@@ -338,6 +337,7 @@
 | file://:0:0:0:0 | parameter 0 of Write | file://:0:0:0:0 | [summary] to write: argument -1 in Write |
 | file://:0:0:0:0 | parameter 0 of Write | file://:0:0:0:0 | [summary] to write: argument -1 in Write |
 | file://:0:0:0:0 | parameter 0 of Write | file://:0:0:0:0 | [summary] to write: argument -1 in Write |
+| file://:0:0:0:0 | parameter 0 of Write | file://:0:0:0:0 | [summary] to write: argument -1 in Write |
 | file://:0:0:0:0 | parameter 0 of WriteAt | file://:0:0:0:0 | [summary] to write: argument -1 in WriteAt |
 | file://:0:0:0:0 | parameter 0 of WriteAt | file://:0:0:0:0 | [summary] to write: argument -1 in WriteAt |
 | file://:0:0:0:0 | parameter 0 of WriteAt | file://:0:0:0:0 | [summary] to write: argument -1 in WriteAt |
@@ -537,7 +537,6 @@
 | file://:0:0:0:0 | parameter -1 of Info | file://:0:0:0:0 | [summary] to write: return (return[0]) in Info |
 | file://:0:0:0:0 | parameter -1 of Info | file://:0:0:0:0 | [summary] to write: return (return[0]) in Info |
 | file://:0:0:0:0 | parameter -1 of Info | file://:0:0:0:0 | [summary] to write: return (return[0]) in Info |
-| file://:0:0:0:0 | parameter -1 of Info | file://:0:0:0:0 | [summary] to write: return (return[0]) in Info |
 | file://:0:0:0:0 | parameter -1 of Init | file://:0:0:0:0 | [summary] to write: return (return[0]) in Init |
 | file://:0:0:0:0 | parameter -1 of Interface | file://:0:0:0:0 | [summary] to write: return (return[0]) in Interface |
 | file://:0:0:0:0 | parameter -1 of InterfaceData | file://:0:0:0:0 | [summary] to write: return (return[0]) in InterfaceData |
@@ -583,7 +582,6 @@
 | file://:0:0:0:0 | parameter -1 of Name | file://:0:0:0:0 | [summary] to write: return (return[0]) in Name |
 | file://:0:0:0:0 | parameter -1 of Name | file://:0:0:0:0 | [summary] to write: return (return[0]) in Name |
 | file://:0:0:0:0 | parameter -1 of Name | file://:0:0:0:0 | [summary] to write: return (return[0]) in Name |
-| file://:0:0:0:0 | parameter -1 of Name | file://:0:0:0:0 | [summary] to write: return (return[0]) in Name |
 | file://:0:0:0:0 | parameter -1 of Next | file://:0:0:0:0 | [summary] to write: return (return[0]) in Next |
 | file://:0:0:0:0 | parameter -1 of Next | file://:0:0:0:0 | [summary] to write: return (return[0]) in Next |
 | file://:0:0:0:0 | parameter -1 of NextPart | file://:0:0:0:0 | [summary] to write: return (return[0]) in NextPart |
@@ -673,8 +671,6 @@
 | file://:0:0:0:0 | parameter -1 of Read | file://:0:0:0:0 | [summary] to write: argument 0 in Read |
 | file://:0:0:0:0 | parameter -1 of Read | file://:0:0:0:0 | [summary] to write: argument 0 in Read |
 | file://:0:0:0:0 | parameter -1 of Read | file://:0:0:0:0 | [summary] to write: argument 0 in Read |
-| file://:0:0:0:0 | parameter -1 of Read | file://:0:0:0:0 | [summary] to write: argument 0 in Read |
-| file://:0:0:0:0 | parameter -1 of Read | file://:0:0:0:0 | [summary] to write: argument 0 in Read |
 | file://:0:0:0:0 | parameter -1 of ReadAt | file://:0:0:0:0 | [summary] to write: argument 0 in ReadAt |
 | file://:0:0:0:0 | parameter -1 of ReadAt | file://:0:0:0:0 | [summary] to write: argument 0 in ReadAt |
 | file://:0:0:0:0 | parameter -1 of ReadAt | file://:0:0:0:0 | [summary] to write: argument 0 in ReadAt |

go/ql/test/library-tests/semmle/go/frameworks/TaintSteps/TaintStep.ql

@@ -3,5 +3,20 @@ import go
 from DataFlow::Node pred, DataFlow::Node succ
 where
   TaintTracking::localTaintStep(pred, succ) and
-  not DataFlow::localFlowStep(pred, succ)
+  not DataFlow::localFlowStep(pred, succ) and
+  // Exclude results which only appear on unix to avoid platform-specific results
+  not exists(string pkg, string name |
+    pred.(DataFlow::SummarizedParameterNode)
+        .getCallable()
+        .asSummarizedCallable()
+        .asFunction()
+        .hasQualifiedName(pkg, name)
+  |
+    pkg = "syscall" and name = "StringSlicePtr"
+    or
+    pkg.matches("crypto/rand.%") and
+    name = "Read"
+    or
+    pkg = ["os.dirEntry", "os.unixDirent"] and name = ["Info", "Name"]
+  )
 select pred, succ