Introduce a new sysctl to retrieve VM map entries

This adds a new sysctl KERN_PROC_VMMAP, which returns an array of VM map
entries of a specified process.  This prevents debuggers from iterating
vm_map_entry RB tree via kvm(3).

The name KERN_PROC_VMMAP and struct kinfo_vmentry are chosen from the same
function in FreeBSD.  struct kinfo_vmentry is revised to reduce size, because
OpenBSD does not keep track of filepaths.  The semantic is also changed to
return max buffer size as a hint, and start iteration at the specified base
address.

Much valuable input from deraadt@, guenther@, tedu@

OK tedu@ deraadt@

1 files changed, 6 insertions, 1 deletions

diff --git a/sys/uvm/uvm_map.h b/sys/uvm/uvm_map.h
index c69c5f9e6d3..70c23e8c56b 100644
--- a/sys/uvm/uvm_map.h
+++ b/sys/uvm/uvm_map.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: uvm_map.h,v 1.51 2014/07/11 16:35:40 jsg Exp $	*/
+/*	$OpenBSD: uvm_map.h,v 1.52 2014/12/05 04:12:48 uebayasi Exp $	*/
 /*	$NetBSD: uvm_map.h,v 1.24 2001/02/18 21:19:08 chs Exp $	*/
 
 /*
@@ -400,6 +400,11 @@ void		uvm_unmap_detach(struct uvm_map_deadq*, int);
 void		uvm_unmap_remove(struct vm_map*, vaddr_t, vaddr_t,
 		    struct uvm_map_deadq*, boolean_t, boolean_t);
 
+struct kinfo_vmentry;
+
+int		uvm_map_fill_vmmap(struct vm_map *, struct kinfo_vmentry *,
+		    size_t *);
+
 #endif /* _KERNEL */
 
 /*