Revision 6fc5bae797a6632bbccdd49a1b6a96121368a4b9 authored by David S. Miller on 29 December 2006, 05:00:23 UTC, committed by David S. Miller on 31 December 2006, 22:06:04 UTC
We were not being careful enough. When we trim the physical memory areas, we have to make sure we don't remove the kernel image or initial ramdisk image ranges. Signed-off-by: David S. Miller <davem@davemloft.net>
1 parent bfff6e9
utsname.c
/*
* Copyright (C) 2004 IBM Corporation
*
* Author: Serge Hallyn <serue@us.ibm.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation, version 2 of the
* License.
*/
#include <linux/module.h>
#include <linux/uts.h>
#include <linux/utsname.h>
#include <linux/version.h>
/*
* Clone a new ns copying an original utsname, setting refcount to 1
* @old_ns: namespace to clone
* Return NULL on error (failure to kmalloc), new ns otherwise
*/
static struct uts_namespace *clone_uts_ns(struct uts_namespace *old_ns)
{
struct uts_namespace *ns;
ns = kmalloc(sizeof(struct uts_namespace), GFP_KERNEL);
if (ns) {
memcpy(&ns->name, &old_ns->name, sizeof(ns->name));
kref_init(&ns->kref);
}
return ns;
}
/*
* unshare the current process' utsname namespace.
* called only in sys_unshare()
*/
int unshare_utsname(unsigned long unshare_flags, struct uts_namespace **new_uts)
{
if (unshare_flags & CLONE_NEWUTS) {
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
*new_uts = clone_uts_ns(current->nsproxy->uts_ns);
if (!*new_uts)
return -ENOMEM;
}
return 0;
}
/*
* Copy task tsk's utsname namespace, or clone it if flags
* specifies CLONE_NEWUTS. In latter case, changes to the
* utsname of this process won't be seen by parent, and vice
* versa.
*/
int copy_utsname(int flags, struct task_struct *tsk)
{
struct uts_namespace *old_ns = tsk->nsproxy->uts_ns;
struct uts_namespace *new_ns;
int err = 0;
if (!old_ns)
return 0;
get_uts_ns(old_ns);
if (!(flags & CLONE_NEWUTS))
return 0;
if (!capable(CAP_SYS_ADMIN)) {
err = -EPERM;
goto out;
}
new_ns = clone_uts_ns(old_ns);
if (!new_ns) {
err = -ENOMEM;
goto out;
}
tsk->nsproxy->uts_ns = new_ns;
out:
put_uts_ns(old_ns);
return err;
}
void free_uts_ns(struct kref *kref)
{
struct uts_namespace *ns;
ns = container_of(kref, struct uts_namespace, kref);
kfree(ns);
}
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