VM_MAP_PROTECT(9) BSD Kernel Developer's Manual VM_MAP_PROTECT(9)NAME
vm_map_protect -- apply protection bits to a virtual memory region
SYNOPSIS
#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);
DESCRIPTION
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.
IMPLEMENTATION NOTES
The function acquires a lock on the map for the duration, by calling vm_map_lock(9).
RETURN VALUES
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.
SEE ALSO vm_map(9)AUTHORS
This manual page was written by Bruce M Simpson <bms@spc.org>.
BSD July 19, 2003 BSD
Check Out this Related Man Page
VM_MAP_CHECK_PROTECTION(9) BSD Kernel Developer's Manual VM_MAP_CHECK_PROTECTION(9)NAME
vm_map_check_protection -- check memory protection for a vm_map
SYNOPSIS
#include <sys/param.h>
#include <vm/vm.h>
#include <vm/vm_map.h>
boolean_t
vm_map_check_protection(vm_map_t map, vm_offset_t start, vm_offset_t end, vm_prot_t protection);
DESCRIPTION
The vm_map_check_protection() function asserts that the target map allows the specified privilege protection over the entire address range
from start to end. The region MUST be contiguous; no holes are allowed.
IMPLEMENTATION NOTES
This code does not and SHOULD not check whether the contents of the region are accessible. For example, a small file may be mapped into an
address space which is significantly larger in size.
RETURN VALUES
The vm_map_check_protection() function returns TRUE if the privilege is allowed; if it is not allowed, or if any other error occurred, the
value FALSE is returned.
SEE ALSO munmap(2), vm_map(9), vm_map_protect(9)AUTHORS
This manual page was written by Bruce M Simpson <bms@spc.org>.
BSD July 19, 2003 BSD
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