[Content Extensions] Don't unmap shared memory

• Component: WebKit2
• Status: RESOLVED FIXED

[Alex Christensen]

Right now, when the Data object is destroyed, the mmap'd memory is munmap'd.  The memory that is then shared is unmapped underneath us!

This is a partial fix.  We should also make sure that the memory is not munmap'd until there are no more shared memory handles pointing to it, but this makes it useable.

[Alex Christensen]

Created attachment 250551 [details]
Patch

[Alex Christensen]

Anders, could you mention this bug in the radar when reviewing?

[Darin Adler]

Comment on attachment 250551 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=250551&action=review

> Source/WebKit2/Shared/WebCompiledContentExtensionData.h:48
> +    WebCompiledContentExtensionData(PassRefPtr<SharedMemory> data, NetworkCache::Data fileData, unsigned actionsOffset, unsigned actionsSize, unsigned bytecodeOffset, unsigned bytecodeSize)

New code should not use PassRefPtr. This should be RefPtr<SharedMemory>&& if you want to move it in. Then use WTF::move below.

[Alex Christensen]

(In reply to comment #3)
> New code should not use PassRefPtr. This should be RefPtr<SharedMemory>&& if
> you want to move it in. Then use WTF::move below.
I only made that change because stylebot got mad at me for leaving it as RefPtr.  If this is true (which it probably is) then stylebot should be changed.

[Brady Eidson]

(In reply to comment #4)
> (In reply to comment #3)
> > New code should not use PassRefPtr. This should be RefPtr<SharedMemory>&& if
> > you want to move it in. Then use WTF::move below.
> I only made that change because stylebot got mad at me for leaving it as
> RefPtr.  If this is true (which it probably is) then stylebot should be
> changed.

Stylebot normally says things like "If even of these errors are wrong please file a bug on check-webkit-style", so you should probably file a bug on check-webkit-style :)

[Alex Christensen]

http://trac.webkit.org/changeset/182742