Bug 1491783: Allow file delete and write during VerifySignature;r=aklotz

Differential Revision: https://phabricator.services.mozilla.com/D6014

--HG--
extra : moz-landing-system : lando

mozglue/build/Authenticode.cpp

@@ -265,7 +265,8 @@ SignedBinary::VerifySignature(const wchar_t* aFilePath)
 
   // Now we need to hash the file at aFilePath.
   // Since we're hashing this file, let's open it with a sequential scan hint.
-  HANDLE rawFile = ::CreateFileW(aFilePath, GENERIC_READ, FILE_SHARE_READ,
+  HANDLE rawFile = ::CreateFileW(aFilePath, GENERIC_READ,
+                                 FILE_SHARE_READ | FILE_SHARE_DELETE | FILE_SHARE_WRITE,
                                  nullptr, OPEN_EXISTING,
                                  FILE_FLAG_SEQUENTIAL_SCAN, nullptr);
   if (rawFile == INVALID_HANDLE_VALUE) {