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Eric W. Biederman
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Linus Torvalds
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Feb 14, 2007
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| --- | ||
| refs/heads/master: b04c3afb2b6e2f902b41bb62b73684d92d7e6c34 | ||
| refs/heads/master: 39732acd968a007036ff3c504f1e6748024ef548 |
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| /* | ||
| * 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/version.h> | ||
| #include <linux/sysctl.h> | ||
|
|
||
| static void *get_uts(ctl_table *table, int write) | ||
| { | ||
| char *which = table->data; | ||
| #ifdef CONFIG_UTS_NS | ||
| struct uts_namespace *uts_ns = current->nsproxy->uts_ns; | ||
| which = (which - (char *)&init_uts_ns) + (char *)uts_ns; | ||
| #endif | ||
| 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 | ||
|
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||
|
|
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| #ifdef CONFIG_SYSCTL_SYSCALL | ||
| /* The generic string strategy routine: */ | ||
| static int sysctl_uts_string(ctl_table *table, int __user *name, int nlen, | ||
| 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, name, nlen, | ||
| 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, 0); | ||
| return 0; | ||
| } | ||
|
|
||
| __initcall(utsname_sysctl_init); |