Bug 242266

Summary:	Align with spec on SharedArrayBuffer availability (COOP+COEP) and postMessage
Product:	WebKit	Reporter:	Sam Sneddon [:gsnedders] <gsnedders>
Component:	WebKit Misc.	Assignee:	Nobody <webkit-unassigned>
Status:	RESOLVED DUPLICATE
Severity:	Normal	CC:	cdumez, webkit-bug-importer, ysuzuki
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified

Description Sam Sneddon [:gsnedders] 2022-07-01 14:30:55 PDT

Brent accidentally sent me down a wormhole that led me here.

In short, we should match the spec as of https://github.com/whatwg/html/pull/4734; this means (tl;dr):

SharedArrayBuffer is available, though the constructor is not, regardless of COOP+COEP, but cannot be sent via postMessage.

With suitable restrictive COOP+COEP headers, the SharedArrayBuffer constructor is available and can be sent via postMessage.

See https://wpt.fyi/results/html/infrastructure/safe-passing-of-structured-data?label=master&label=experimental&product=chrome&product=firefox&product=safari&aligned

This also explains Bug 220364.

Comment 1 Radar WebKit Bug Importer 2022-07-01 14:31:07 PDT

<rdar://problem/96314637>

Comment 2 Sam Sneddon [:gsnedders] 2022-07-01 14:54:38 PDT

(In reply to Sam Sneddon [:gsnedders] from comment #0)
> Brent accidentally sent me down a wormhole that led me here.

Specifically, it led to me writing https://github.com/web-platform-tests/wpt/pull/34678 because they don't pass with our current restrictions (as it turns out, that change is also wrong because I didn't make them load over HTTPS, but that's a problem for next week).

Comment 3 Yusuke Suzuki 2022-08-11 17:31:25 PDT

Fixed in bug 243764

*** This bug has been marked as a duplicate of bug 243764 ***