zx_vmar_protect

NAME

vmar_protect - set protection of virtual memory pages

SYNOPSIS

#include <zircon/syscalls.h>

zx_status_t zx_vmar_protect(zx_handle_t vmar_handle,
                            uintptr_t addr, size_t len,
                            uint32_t prot_flags);

DESCRIPTION

vmar_protect() alters the access protections for the memory mappings in the range of len bytes starting from addr. The prot_flags argument should be a bitwise-or of one or more of the following:

ZX_VM_FLAG_PERM_READ Map as readable. It is an error if vmar does not have ZX_VM_FLAG_CAN_MAP_READ permissions or the vmar handle does not have the ZX_RIGHT_READ right. It is also an error if the VMO handle used to create the mapping did not have the ZX_RIGHT_READ right.
ZX_VM_FLAG_PERM_WRITE Map as writable. It is an error if vmar does not have ZX_VM_FLAG_CAN_MAP_WRITE permissions or the vmar handle does not have the ZX_RIGHT_WRITE right. It is also an error if the VMO handle used to create the mapping did not have the ZX_RIGHT_WRITE right.
ZX_VM_FLAG_PERM_EXECUTE Map as executable. It is an error if vmar does not have ZX_VM_FLAG_CAN_MAP_EXECUTE permissions or the vmar handle does not have the ZX_RIGHT_EXECUTE right. It is also an error if the VMO handle used to create the mapping did not have the ZX_RIGHT_EXECUTE right.

If len is not page-aligned, it will be rounded up the next page boundary.

RETURN VALUE

vmar_protect() returns ZX_OK on success.

ERRORS

ZX_ERR_BAD_HANDLE vmar_handle is not a valid handle.

ZX_ERR_WRONG_TYPE vmar_handle is not a VMAR handle.

ZX_ERR_INVALID_ARGS prot_flags is an unsupported combination of flags (e.g., PROT_WRITE but not PROT_READ), addr is not page-aligned, len is 0, or some subrange of the requested range is occupied by a subregion.

ZX_ERR_NOT_FOUND Some subrange of the requested range is not mapped.

ZX_ERR_ACCESS_DENIED vmar_handle does not have the proper rights for the requested change, the original VMO handle used to create the mapping did not have the rights for the requested change, or the VMAR itself does not allow the requested change.