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Re: [tor-bugs] #22584 [Applications/Tor Browser]: More RWX memory pages for TBB on some Windows versions
#22584: More RWX memory pages for TBB on some Windows versions
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Reporter: arthuredelstein | Owner: tbb-team
Type: defect | Status: new
Priority: Medium | Milestone:
Component: Applications/Tor Browser | Version:
Severity: Normal | Resolution:
Keywords: tbb-security | Actual Points:
Parent ID: | Points:
Reviewer: | Sponsor:
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Comment (by arthuredelstein):
Replying to [comment:4 cypherpunks]:
> ticket:21617#comment:14 is about `softokn3.dll` and `freebl3.dll` have
`W^X` pages on Windows 10 (15063) for unknown reason.
> `about:support` page is a good way to force lazyloaders in Firefox to
load DLLs.
I'm able to reproduce the RWX pages for these two DLLs. They are all
labeled ".text", which leads me to assembly code in the freebl and
softoken parts of the mozilla codebase. But I don't see anything
explicitly requesting RWX or X/COW memory.
Interestingly, I don't see these RWX pages in the latest release version
of Firefox. And, if I build tor-browser.git using `./mach build` on
Windows, I also don't see any RWX pages. That suggests to me that the RWX
pages observed in TBB may be related to how we are building tor-
browser.git with mingw32-gcc.
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22584#comment:7>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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