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Date:      Wed, 12 Feb 2003 20:41:18 +0100 (CET)
From:      Rolf Grossmann <grossman@progtech.net>
To:        FreeBSD-gnats-submit@FreeBSD.org
Subject:   kern/48216: Linux uname returns wrong hostname inside jail
Message-ID:  <200302121941.h1CJfINn023268@ptserver.progtech.intern>

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>Number:         48216
>Category:       kern
>Synopsis:       Linux uname returns wrong hostname inside jail
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Feb 12 11:50:06 PST 2003
>Closed-Date:
>Last-Modified:
>Originator:     Rolf Grossmann
>Release:        FreeBSD 4.7-STABLE i386
>Organization:
PROGTECH GmbH
>Environment:
System: FreeBSD ptserver 4.7-STABLE FreeBSD 4.7-STABLE #2: Thu Nov 14 19:43:00 CET 2002 grossman@ptserver:/export/home/grossman/tmp/sys/compile/PTSERVER i386

>Description:
	
In a jail-ed environment, the linux uname system call still returns the
machine's main hostname (not the one given in the jail command).

>How-To-Repeat:

Try this (adjust hostname and ip addresses to your system):

# uname -n
ptserver
# jail / ptserver.progtech.intern 10.25.0.1 /bin/tcsh
# uname -n
ptserver.progtech.intern
# /compat/linux/bin/uname -n
ptserver

>Fix:

This patch fixes the problem for me on a recent -STABLE. I would guess that
it might work aswell on -CURRENT, but I haven't checked. (FWIW linux_misc.c
is the same, so the bug is in -CURRENT, too.)

RCS file: /home/freebsd/cvs/cvs/src/sys/compat/linux/linux_misc.c,v
retrieving revision 1.85.2.9
diff -u -r1.85.2.9 linux_misc.c
--- linux_misc.c	24 Sep 2002 08:11:41 -0000	1.85.2.9
+++ linux_misc.c	12 Feb 2003 19:15:32 -0000
@@ -686,6 +686,8 @@
 {
 	struct l_new_utsname utsname;
 	char *osrelease, *osname;
+	int name[2], rtval;
+	size_t len;
 
 #ifdef DEBUG
 	if (ldebug(newuname))
@@ -697,7 +699,11 @@
 
 	bzero(&utsname, sizeof(utsname));
 	strncpy(utsname.sysname, osname, LINUX_MAX_UTSNAME-1);
-	strncpy(utsname.nodename, hostname, LINUX_MAX_UTSNAME-1);
+	name[0] = CTL_KERN;
+	name[1] = KERN_HOSTNAME;
+	len = LINUX_MAX_UTSNAME-1;
+	rtval = kernel_sysctl(p, name, 2, utsname.nodename, &len, 0, 0, 0);
+	if (rtval) return rtval;
 	strncpy(utsname.release, osrelease, LINUX_MAX_UTSNAME-1);
 	strncpy(utsname.version, version, LINUX_MAX_UTSNAME-1);
 	strncpy(utsname.machine, machine, LINUX_MAX_UTSNAME-1);



>Release-Note:
>Audit-Trail:
>Unformatted:

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