Seal the usertrap table against application modification. - #15172
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Patched application code jumps into the usertrap table, but the application could still munmap(), mprotect(), mremap(), or madvise(MADV_DONTNEED/MADV_DONTFORK) it. This allowed for application threads to fault in the middle of the trampoline code, causing corrupted state. Note this does NOT implement mseal. Sealing is a sentry-only privilege and is reserved for sealing sentry-managed areas within userspace. PiperOrigin-RevId: 991323287
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Seal the usertrap table against application modification.
Patched application code jumps into the usertrap table, but the
application could still munmap(), mprotect(), mremap(), or
madvise(MADV_DONTNEED/MADV_DONTFORK) it. This allowed for application threads
to fault in the middle of the trampoline code, causing corrupted state.
Note this does NOT implement mseal. Sealing is a sentry-only privilege and is
reserved for sealing sentry-managed areas within userspace.