f221e726bf
name and nlen parameters passed to ->strategy hook are unused, remove them. In general ->strategy hook should know what it's doing, and don't do something tricky for which, say, pointer to original userspace array may be needed (name). Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Acked-by: David S. Miller <davem@davemloft.net> [ networking bits ] Cc: Ralf Baechle <ralf@linux-mips.org> Cc: David Howells <dhowells@redhat.com> Cc: Matt Mackall <mpm@selenic.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
145 lines
3.4 KiB
C
145 lines
3.4 KiB
C
/*
|
|
* Copyright (C) 2007
|
|
*
|
|
* Author: Eric Biederman <ebiederm@xmision.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/sysctl.h>
|
|
|
|
static void *get_uts(ctl_table *table, int write)
|
|
{
|
|
char *which = table->data;
|
|
struct uts_namespace *uts_ns;
|
|
|
|
uts_ns = current->nsproxy->uts_ns;
|
|
which = (which - (char *)&init_uts_ns) + (char *)uts_ns;
|
|
|
|
if (!write)
|
|
down_read(&uts_sem);
|
|
else
|
|
down_write(&uts_sem);
|
|
return which;
|
|
}
|
|
|
|
static void put_uts(ctl_table *table, int write, void *which)
|
|
{
|
|
if (!write)
|
|
up_read(&uts_sem);
|
|
else
|
|
up_write(&uts_sem);
|
|
}
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
/*
|
|
* Special case of dostring for the UTS structure. This has locks
|
|
* to observe. Should this be in kernel/sys.c ????
|
|
*/
|
|
static int proc_do_uts_string(ctl_table *table, int write, struct file *filp,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
struct ctl_table uts_table;
|
|
int r;
|
|
memcpy(&uts_table, table, sizeof(uts_table));
|
|
uts_table.data = get_uts(table, write);
|
|
r = proc_dostring(&uts_table,write,filp,buffer,lenp, ppos);
|
|
put_uts(table, write, uts_table.data);
|
|
return r;
|
|
}
|
|
#else
|
|
#define proc_do_uts_string NULL
|
|
#endif
|
|
|
|
|
|
#ifdef CONFIG_SYSCTL_SYSCALL
|
|
/* The generic string strategy routine: */
|
|
static int sysctl_uts_string(ctl_table *table,
|
|
void __user *oldval, size_t __user *oldlenp,
|
|
void __user *newval, size_t newlen)
|
|
{
|
|
struct ctl_table uts_table;
|
|
int r, write;
|
|
write = newval && newlen;
|
|
memcpy(&uts_table, table, sizeof(uts_table));
|
|
uts_table.data = get_uts(table, write);
|
|
r = sysctl_string(&uts_table, oldval, oldlenp, newval, newlen);
|
|
put_uts(table, write, uts_table.data);
|
|
return r;
|
|
}
|
|
#else
|
|
#define sysctl_uts_string NULL
|
|
#endif
|
|
|
|
static struct ctl_table uts_kern_table[] = {
|
|
{
|
|
.ctl_name = KERN_OSTYPE,
|
|
.procname = "ostype",
|
|
.data = init_uts_ns.name.sysname,
|
|
.maxlen = sizeof(init_uts_ns.name.sysname),
|
|
.mode = 0444,
|
|
.proc_handler = proc_do_uts_string,
|
|
.strategy = sysctl_uts_string,
|
|
},
|
|
{
|
|
.ctl_name = KERN_OSRELEASE,
|
|
.procname = "osrelease",
|
|
.data = init_uts_ns.name.release,
|
|
.maxlen = sizeof(init_uts_ns.name.release),
|
|
.mode = 0444,
|
|
.proc_handler = proc_do_uts_string,
|
|
.strategy = sysctl_uts_string,
|
|
},
|
|
{
|
|
.ctl_name = KERN_VERSION,
|
|
.procname = "version",
|
|
.data = init_uts_ns.name.version,
|
|
.maxlen = sizeof(init_uts_ns.name.version),
|
|
.mode = 0444,
|
|
.proc_handler = proc_do_uts_string,
|
|
.strategy = sysctl_uts_string,
|
|
},
|
|
{
|
|
.ctl_name = KERN_NODENAME,
|
|
.procname = "hostname",
|
|
.data = init_uts_ns.name.nodename,
|
|
.maxlen = sizeof(init_uts_ns.name.nodename),
|
|
.mode = 0644,
|
|
.proc_handler = proc_do_uts_string,
|
|
.strategy = sysctl_uts_string,
|
|
},
|
|
{
|
|
.ctl_name = KERN_DOMAINNAME,
|
|
.procname = "domainname",
|
|
.data = init_uts_ns.name.domainname,
|
|
.maxlen = sizeof(init_uts_ns.name.domainname),
|
|
.mode = 0644,
|
|
.proc_handler = proc_do_uts_string,
|
|
.strategy = sysctl_uts_string,
|
|
},
|
|
{}
|
|
};
|
|
|
|
static struct ctl_table uts_root_table[] = {
|
|
{
|
|
.ctl_name = CTL_KERN,
|
|
.procname = "kernel",
|
|
.mode = 0555,
|
|
.child = uts_kern_table,
|
|
},
|
|
{}
|
|
};
|
|
|
|
static int __init utsname_sysctl_init(void)
|
|
{
|
|
register_sysctl_table(uts_root_table);
|
|
return 0;
|
|
}
|
|
|
|
__initcall(utsname_sysctl_init);
|