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>
next in thread | raw e-mail | index | archive | help
>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:
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-bugs" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200302121941.h1CJfINn023268>