Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 824037e6445b151e2d3c2aefe7a87e0196a43cf9
https://github.com/WebKit/WebKit/commit/824037e6445b151e2d3c2aefe7a87e0196a43cf9
Author: Marcus Plutowski <[email protected]>
Date: 2026-03-19 (Thu, 19 Mar 2026)
Changed paths:
M Source/bmalloc/bmalloc/TZoneHeapManager.cpp
M Source/bmalloc/libpas/src/libpas/bmalloc_heap.c
M Source/bmalloc/libpas/src/libpas/bmalloc_heap_inlines.h
M Source/bmalloc/libpas/src/libpas/pas_allocation_mode.h
M Source/bmalloc/libpas/src/libpas/pas_mte_config.h
Log Message:
-----------
[libpas] Disable and rename PAS_USE_COMPACT_ONLY_TZONE_HEAP
https://bugs.webkit.org/show_bug.cgi?id=310115
rdar://172759337
Reviewed by Mark Lam.
This was previously enabled as a performance optimization,
which no longer applies now that we distinguish between
hardened and non-hardened WebContent processes.
As such, we can incrementally harden our security posture by
re-enabling size segregation for non-compact objects in
+MTE processes.
This also renames PAS_USE_COMPACT_ONLY_TZONE_HEAP to
PAS_BYPASS_TZONE_FOR_NONCOMPACT_OBJECTS to be explicit about what the
macro actually does -- beforehand it was vague and the most direct
implication was actually the opposite of what it does.
Further, it removes PAS_USE_COPMACT_ONLY_HEAP altogether, as there's
no benefit to leaving that in now that we're locked in to using MTE.
Canonical link: https://commits.webkit.org/309583@main
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