[Webkit-unassigned] [Bug 280974] New: [JSC] Extend FastJITPermissions scaffolding to other permissions-toggling applications

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Mon Oct 7 07:55:51 PDT 2024


https://bugs.webkit.org/show_bug.cgi?id=280974

            Bug ID: 280974
           Summary: [JSC] Extend FastJITPermissions scaffolding to other
                    permissions-toggling applications
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: marcus_plutowski at apple.com

rdar://137426755

FastJITPermissions exposes a convenient interface for atomically write-protecting executable memory: it makes it possible to flip the permissions of JIT memory between RW and RX without any gap inbetween. Currently that is the only use for this interface, but it is easy to think of others: for example, toggling memory between RW and RO permissions. While it may use different mechanisms under the hood, unifying the abstractions would be helpful for codebase cleanliness and ease of understanding. We should investigate whether there are already opportunities present elsewhere in the code-base that could be unified with this one.

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