Add flow summaries and entry points for ArrayBuffer and SharedArrayBuffer

Author: Napalys

javascript/ql/lib/semmle/javascript/internal/flow_summaries/TypedArrays.qll

@@ -60,3 +60,42 @@ class SubArrayLike extends SummarizedCallable {
     output = "ReturnValue.ArrayElement"
   }
 }
+
+private class ArrayBufferEntryPoint extends API::EntryPoint {
+  ArrayBufferEntryPoint() { this = ["global.ArrayBuffer", "global.SharedArrayBuffer"] }
+
+  override DataFlow::SourceNode getASource() {
+    result = DataFlow::globalVarRef(["ArrayBuffer", "SharedArrayBuffer"])
+  }
+}
+
+pragma[nomagic]
+API::Node arrayBufferConstructorRef() { result = any(ArrayBufferEntryPoint a).getANode() }
+
+class ArrayBufferConstructorSummary extends SummarizedCallable {
+  ArrayBufferConstructorSummary() { this = "ArrayBuffer constructor" }
+
+  override DataFlow::InvokeNode getACall() {
+    result = arrayBufferConstructorRef().getAnInstantiation()
+  }
+
+  override predicate propagatesFlow(string input, string output, boolean preservesValue) {
+    preservesValue = true and
+    input = "Argument[0].ArrayElement" and
+    output = "ReturnValue.ArrayElement"
+  }
+}
+
+class TransferLike extends SummarizedCallable {
+  TransferLike() { this = "ArrayBuffer#transfer" }
+
+  override InstanceCall getACall() {
+    result.getMethodName() = ["transfer", "transferToFixedLength"]
+  }
+
+  override predicate propagatesFlow(string input, string output, boolean preservesValue) {
+    preservesValue = true and
+    input = "Argument[this].ArrayElement" and
+    output = "ReturnValue.ArrayElement"
+  }
+}

javascript/ql/test/library-tests/TaintTracking/BasicTaintTracking.expected

@@ -41,15 +41,15 @@ legacyDataFlowDifference
 | typed-arrays.js:2:13:2:20 | source() | typed-arrays.js:15:10:15:10 | z | only flow with NEW data flow library |
 | typed-arrays.js:2:13:2:20 | source() | typed-arrays.js:18:10:18:12 | sub | only flow with NEW data flow library |
 | typed-arrays.js:2:13:2:20 | source() | typed-arrays.js:22:10:22:14 | clone | only flow with NEW data flow library |
+| typed-arrays.js:2:13:2:20 | source() | typed-arrays.js:26:10:26:13 | view | only flow with NEW data flow library |
+| typed-arrays.js:2:13:2:20 | source() | typed-arrays.js:30:10:30:14 | view1 | only flow with NEW data flow library |
+| typed-arrays.js:2:13:2:20 | source() | typed-arrays.js:34:10:34:23 | transferedView | only flow with NEW data flow library |
+| typed-arrays.js:2:13:2:20 | source() | typed-arrays.js:38:10:38:24 | transferedView2 | only flow with NEW data flow library |
 | use-use-after-implicit-read.js:7:17:7:24 | source() | use-use-after-implicit-read.js:15:10:15:10 | x | only flow with NEW data flow library |
 consistencyIssue
 | nested-props.js:20 | expected an alert, but found none | NOT OK - but not found | Consistency |
 | stringification-read-steps.js:17 | expected an alert, but found none | NOT OK | Consistency |
 | stringification-read-steps.js:25 | expected an alert, but found none | NOT OK | Consistency |
-| typed-arrays.js:26 | expected an alert, but found none | NOT OK | Consistency |
-| typed-arrays.js:30 | expected an alert, but found none | NOT OK | Consistency |
-| typed-arrays.js:34 | expected an alert, but found none | NOT OK | Consistency |
-| typed-arrays.js:38 | expected an alert, but found none | NOT OK | Consistency |
 flow
 | access-path-sanitizer.js:2:18:2:25 | source() | access-path-sanitizer.js:4:8:4:12 | obj.x |
 | addexpr.js:4:10:4:17 | source() | addexpr.js:7:8:7:8 | x |
@@ -341,6 +341,10 @@ flow
 | typed-arrays.js:2:13:2:20 | source() | typed-arrays.js:15:10:15:10 | z |
 | typed-arrays.js:2:13:2:20 | source() | typed-arrays.js:18:10:18:12 | sub |
 | typed-arrays.js:2:13:2:20 | source() | typed-arrays.js:22:10:22:14 | clone |
+| typed-arrays.js:2:13:2:20 | source() | typed-arrays.js:26:10:26:13 | view |
+| typed-arrays.js:2:13:2:20 | source() | typed-arrays.js:30:10:30:14 | view1 |
+| typed-arrays.js:2:13:2:20 | source() | typed-arrays.js:34:10:34:23 | transferedView |
+| typed-arrays.js:2:13:2:20 | source() | typed-arrays.js:38:10:38:24 | transferedView2 |
 | use-use-after-implicit-read.js:7:17:7:24 | source() | use-use-after-implicit-read.js:8:10:8:17 | captured |
 | use-use-after-implicit-read.js:7:17:7:24 | source() | use-use-after-implicit-read.js:15:10:15:10 | x |
 | xml.js:5:18:5:25 | source() | xml.js:8:14:8:17 | text |