Bug 306192

Summary:	[bmalloc] handle multiple regions in vmZeroAndPurge on windows
Product:	WebKit	Reporter:	Dylan Conway <dylan.conway567>
Component:	bmalloc	Assignee:	Nobody <webkit-unassigned>
Status:	RESOLVED FIXED
Severity:	Normal	CC:	ggaren, webkit-bug-importer
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified

Dylan Conway

Reported 2026-01-24 15:48:10 PST

Two bugs in vmZeroAndPurge on Windows: 1. If the input pointer+size spans more than one region DiscardVirtualMemory / VirtualFree(MEM_DECOMMIT) / VirtualAlloc(MEM_COMMIT) will fail. 2. DiscardVirtualMemory does not guarantee zeroing the memory so we need to use VirtualFree(MEM_DECOMMIT) / VirtualAlloc(MEM_COMMIT) instead

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EWS

Comment 1 2026-01-25 12:04:55 PST

Committed 306171@main (adb333973f88): <https://commits.webkit.org/306171@main> Reviewed commits have been landed. Closing PR #57187 and removing active labels.

Radar WebKit Bug Importer

Comment 2 2026-01-25 12:05:13 PST

<rdar://problem/168877040>

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