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Closed
Opened by Arthur Edelstein@arthuredelstein

Many memory pages in tor.exe for Windows violate W^X

A cypherpunk (ticket:21617#comment:5) has reported that the tor.exe process in the Tor Expert Bundle on Windows has many Execute/Read/Write memory pages. I also observe the same thing for Tor Browser's tor.exe process. Also, there are many Execute/Copy on Write pages, which I suspect, after reading Microsoft documentation, are also effectively W^X violations.

To reproduce on Windows:

  1. Download VMMap: [https://technet.microsoft.com/en-us/sysinternals/vmmap.aspx]
  2. Run Tor Browser
  3. Run VMMap and select the tor.exe process
  4. Select View > Expand All
  5. In the bottom table of the VMMap window, examine the Protection column. Note many Execute/Read/Write and Execute/Copy on Write pages, all belonging to either tor.exe or DLLs bundled with tor.exe.
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