int
minherit(__unused proc_t p, struct minherit_args *uap, __unused register_t *retval)
{
mach_vm_offset_t addr;
mach_vm_size_t size;
register vm_inherit_t inherit;
vm_map_t user_map;
kern_return_t result;
AUDIT_ARG(addr, uap->addr);
AUDIT_ARG(len, uap->len);
AUDIT_ARG(value, uap->inherit);
addr = (mach_vm_offset_t)uap->addr;
size = (mach_vm_size_t)uap->len;
inherit = uap->inherit;
user_map = current_map();
result = mach_vm_inherit(user_map, addr, size,
inherit);
switch (result) {
case KERN_SUCCESS:
return (0);
case KERN_PROTECTION_FAILURE:
return (EACCES);
}
return (EINVAL);
}
int
main(void)
{
kern_return_t kr;
int status;
mach_port_t mytask = mach_task_self();
mach_vm_size_t size = (mach_vm_size_t)vm_page_size;
kr = mach_vm_allocate(mytask, &page_shared, size, VM_FLAGS_ANYWHERE);
OUT_ON_MACH_ERROR("vm_allocate", kr);
kr = mach_vm_allocate(mytask, &page_cow, size, VM_FLAGS_ANYWHERE);
OUT_ON_MACH_ERROR("vm_allocate", kr);
kr = mach_vm_inherit(mytask, page_shared, size, VM_INHERIT_SHARE);
OUT_ON_MACH_ERROR("vm_inherit(VM_INHERIT_SHARE)", kr);
kr = mach_vm_inherit(mytask, page_cow, size, VM_INHERIT_COPY);
OUT_ON_MACH_ERROR("vm_inherit(VM_INHERIT_COPY)", kr);
FIRST_UINT32(page_shared) = (unsigned int)0xAAAAAAAA;
FIRST_UINT32(page_cow) = (unsigned int)0xBBBBBBBB;
printf("%-12s%-8s%-10s%-12s%-10s%s\n",
"Process", "Page", "Contents", "VM Object", "Refcount", "Event");
peek_at_some_memory("parent", "before forking");
if (fork() == 0)
child_process(); // this will also exit the child
wait(&status);
peek_at_some_memory("parent", "after child is done");
out:
mach_vm_deallocate(mytask, page_shared, size);
mach_vm_deallocate(mytask, page_cow, size);
exit(0);
}
