Kernel capability flow protection. #2465
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This option enables an experimental use of the local/global capability permission bits to prevent kernel capability leak to userspace.
Strip GLOBAL permission bit from kernel capabilities and the STORE_LOCAL permission bit in copyin/out.
Report whether the kernel uses capability flow restriction.
This should only be used to peform data I/O and it is expected that it should not leak kernel capabilities.
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This is an experimental patch that uses LOCAL/GLOBAL to prevent kernel pointers from leaking to userspace.
The patch needs some testing and some more work.
TODO: