[Webkit-unassigned] [Bug 191360] [GTK][WPE] Bubblewrap launcher should not depend on memfd

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=191360

--- Comment #9 from Carlos Garcia Campos <cgarcia at igalia.com> ---
(In reply to Patrick Griffis from comment #8)
> Actually regarding F_SEAL_WRITE, I guess that is the definition of what
> `SharedMemory::Protection::ReadOnly` should do right?

It could be, but I don't think we can do that anyway. It's true that we don't normally create more than one handle for the same shared memory, but the API allows that. We can only seal an fd created by memfd, but not the duplicated one used by the handler (AFAIK). So we would need to seal before dup, making the shared memory read only even if a following createHandle uses a readwrite protection, because seals can't be removed. We could add a seal method to shared memory, to be called after data have been written, but I don't think it's worth it.

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