mention that the kern.global_ptrace sysctl also affects PT_ATTACH

diff --git a/lib/libc/sys/ptrace.2 b/lib/libc/sys/ptrace.2
index 3af57a3..648a191 100644 (file)
--- a/lib/libc/sys/ptrace.2
+++ b/lib/libc/sys/ptrace.2
@@ -1,8 +1,8 @@
-.\"    $OpenBSD: ptrace.2,v 1.30 2014/11/16 18:52:27 jmc Exp $
+.\"    $OpenBSD: ptrace.2,v 1.31 2015/01/25 19:31:38 tedu Exp $
 .\"    $NetBSD: ptrace.2,v 1.3 1996/02/23 01:39:41 jtc Exp $
 .\"
 .\" This file is in the public domain.
-.Dd $Mdocdate: November 16 2014 $
+.Dd $Mdocdate: January 25 2015 $
 .Dt PTRACE 2
 .Os
 .Sh NAME
@@ -164,6 +164,10 @@ arguments are ignored.
 This request requires that the target process must have the same real UID
 as the tracing process, and that it must not be executing a set-user-ID
 or set-group-ID executable.
+Additionally, if the
+.Dv kern.global_ptrace
+sysctl is 0, then the target process must be a descendent of the tracing
+process.
 (If the tracing process is running as root, these restrictions do not apply.)
 The tracing process will see the newly traced process stop and may then
 control it as if it had been traced all along.