[Webkit-unassigned] [Bug 236670] New: OSAllocatorPosix::tryReserveUncommittedAligned() should not use PROT_NONE on non-linux platforms

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=236670

            Bug ID: 236670
           Summary: OSAllocatorPosix::tryReserveUncommittedAligned()
                    should not use PROT_NONE on non-linux platforms
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Platform
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: yoshiaki.jitsukawa at sony.com

OSAllocatorPosix::tryReserveUncommittedAligned() should not use PROT_NONE on non-linux platforms.

Only on linux PROT_NONE is used for deccommitted pages. That is, protection flags are set on commit() only on Linux. 
https://github.com/WebKit/WebKit/blob/9067a50/Source/WTF/wtf/posix/OSAllocatorPOSIX.cpp#L228

However in tryReserveUncommittedAligned() PROT_NONE is used for platforms other than
 #if PLATFORM(MAC) || USE(APPLE_INTERNAL_SDK),
which may result in protection faults because appropriate flags won't be set on commit().

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