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From: Sergey Kandaurov <pluknet@FreeBSD.org>
Date: Fri, 1 Jul 2011 10:25:48 +0000 (UTC)
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Subject: svn commit: r223707 - stable/8/sys/compat/linprocfs
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Author: pluknet
Date: Fri Jul  1 10:25:48 2011
New Revision: 223707
URL: http://svn.freebsd.org/changeset/base/223707

Log:
  MFC r223182:
  
   Return empty cmdline/environ string for processes with kernel address
   space. This is consistent with the behavior in linux.
  
  PR:		kern/157871

Modified:
  stable/8/sys/compat/linprocfs/linprocfs.c
Directory Properties:
  stable/8/sys/   (props changed)
  stable/8/sys/amd64/include/xen/   (props changed)
  stable/8/sys/cddl/contrib/opensolaris/   (props changed)
  stable/8/sys/contrib/dev/acpica/   (props changed)
  stable/8/sys/contrib/pf/   (props changed)

Modified: stable/8/sys/compat/linprocfs/linprocfs.c
==============================================================================
--- stable/8/sys/compat/linprocfs/linprocfs.c	Fri Jul  1 08:27:03 2011	(r223706)
+++ stable/8/sys/compat/linprocfs/linprocfs.c	Fri Jul  1 10:25:48 2011	(r223707)
@@ -1046,6 +1046,15 @@ linprocfs_doproccmdline(PFS_FILL_ARGS)
 		PROC_UNLOCK(p);
 		return (ret);
 	}
+
+	/*
+	 * Mimic linux behavior and pass only processes with usermode
+	 * address space as valid.  Return zero silently otherwize.
+	 */
+	if (p->p_vmspace == &vmspace0) {
+		PROC_UNLOCK(p);
+		return (0);
+	}
 	if (p->p_args != NULL) {
 		sbuf_bcpy(sb, p->p_args->ar_args, p->p_args->ar_length);
 		PROC_UNLOCK(p);
@@ -1070,6 +1079,15 @@ linprocfs_doprocenviron(PFS_FILL_ARGS)
 		PROC_UNLOCK(p);
 		return (ret);
 	}
+
+	/*
+	 * Mimic linux behavior and pass only processes with usermode
+	 * address space as valid.  Return zero silently otherwize.
+	 */
+	if (p->p_vmspace == &vmspace0) {
+		PROC_UNLOCK(p);
+		return (0);
+	}
 	PROC_UNLOCK(p);
 
 	ret = linprocfs_doargv(td, p, sb, ps_string_env);