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mac_proc_vm_revoke_recurse() requests a read lock on the vm map at the start but does not handle failure by vm_map_lock_upgrade() when it seeks to modify the vm map. At present, this works because all lock request on a vm map are implemented as exclusive locks. Thus, vm_map_lock_upgrade() is a no-op that always reports success. However, that is about to change, and proc_vm_revoke_recurse() will require substantial modifications to handle vm_map_lock_upgrade() failures. For the time being, I am changing mac_proc_vm_revoke_recurse() to request a write lock on the vm map at the start. Approved by: rwatson MFC after: 3 months |
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| mac_test | ||