feat(ukl): Add pledge() security syscall #13
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Implements OpenBSD-style pledge(2) for UKL applications: - Add ukl_pledge field to task_struct (sched.h) - Create ukl_pledge.h with 33 pledge bit definitions - Implement sys_ukl_pledge syscall (torvalds#451) - Add documentation in Documentation/ukl/ukl.rst - Add test program in samples/ukl/pledge_test.c Inspired by Nanos unikernel implementation. Phase 1: Storage and basic syscall (no enforcement yet). Security guarantees: - First pledge() sets initial restrictions - Subsequent calls can only REDUCE abilities, never increase - Returns -EPERM on escalation attempt - Returns -EINVAL if PLEDGE_NEVER bit is set
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Implements OpenBSD-style pledge(2) for UKL applications: