diff options
Diffstat (limited to 'vm/vm_user.c')
| -rw-r--r-- | vm/vm_user.c | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/vm/vm_user.c b/vm/vm_user.c index 813b100..672daab 100644 --- a/vm/vm_user.c +++ b/vm/vm_user.c @@ -276,6 +276,12 @@ kern_return_t vm_copy(map, source_address, size, dest_address) return KERN_SUCCESS; } + +/* XXX From memory_object_proxy.c */ +kern_return_t +memory_object_proxy_lookup (ipc_port_t proxy_object, ipc_port_t *object, + vm_prot_t *max_protection); + /* * Routine: vm_map */ @@ -325,7 +331,22 @@ kern_return_t vm_map( copy = FALSE; } else if ((object = vm_object_enter(memory_object, size, FALSE)) == VM_OBJECT_NULL) - return(KERN_INVALID_ARGUMENT); + { + ipc_port_t real_memobj; + vm_prot_t prot; + result = memory_object_proxy_lookup (memory_object, &real_memobj, + &prot); + if (result != KERN_SUCCESS) + return result; + + /* Reduce the allowed access to the memory object. */ + max_protection &= prot; + cur_protection &= prot; + + if ((object = vm_object_enter(real_memobj, size, FALSE)) + == VM_OBJECT_NULL) + return KERN_INVALID_ARGUMENT; + } /* * Perform the copy if requested |