[Webkit-unassigned] [Bug 208671] New: [JSC] Cage JIT pointers to the JIT region

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Thu Mar 5 15:54:21 PST 2020


            Bug ID: 208671
           Summary: [JSC] Cage JIT pointers to the JIT region
           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: msaboff at apple.com

The idea here is that we emit code that cages code pointers to the JIT region so that JIT execution does not escape to not-JIT'ed regions except to known destinations.  For functions that the JIT'ed code needs to call out to in C++ code space, provide a whitelist of allowable entry points.  Finally, verify that the emitted instructions follow the designed restrictions.

This change is currently only implemented for ARM64 hardware.

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