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Man Pages
VM_MAP_PROTECT(9) FreeBSD Kernel Developer's Manual VM_MAP_PROTECT(9)

vm_map_protect
apply protection bits to a virtual memory region

#include <sys/param.h>
#include <vm/vm.h>
#include <vm/vm_map.h>
int
vm_map_protect(vm_map_t map, vm_offset_t start, vm_offset_t end, vm_prot_t new_prot, boolean_t set_max);

The vm_map_protect() function sets the protection bits of the address region bounded by start and end within the map map to new_prot.
If set_max is TRUE, new_prot is treated as the new max_protection setting for each underlying entry. Otherwise, only the protection field is affected.
The range MUST be contiguous, and MUST NOT contain sub-maps.

The function acquires a lock on the map for the duration, by calling vm_map_lock(9).

The vm_map_protect() function returns KERN_SUCCESS if the protection bits could be set successfully.
If a sub-map entry was encountered in the range, KERN_INVALID_ARGUMENT is returned. If the value of new_prot would exceed max_protection for an entry within the range, KERN_PROTECTION_FAILURE is returned.

vm_map(9)

This manual page was written by Bruce M Simpson <bms@spc.org>.
July 19, 2003 FreeBSD 12.0-RELEASE

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