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[PATCH] sysctl: move utsname sysctls to their own file
This is just a simple cleanup to keep kernel/sysctl.c from getting to crowded with special cases, and by keeping all of the utsname logic to together it makes the code a little more readable. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Cc: Serge E. Hallyn <serue@us.ibm.com> Cc: Herbert Poetzl <herbert@13thfloor.at> Cc: Kirill Korotaev <dev@sw.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Eric W. Biederman
Linus Torvalds
parent
b04c3afb2b
commit
39732acd96
3 changed files with 147 additions and 117 deletions
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@ -47,6 +47,7 @@ obj-$(CONFIG_GENERIC_HARDIRQS) += irq/
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obj-$(CONFIG_SECCOMP) += seccomp.o
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obj-$(CONFIG_RCU_TORTURE_TEST) += rcutorture.o
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obj-$(CONFIG_RELAY) += relay.o
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obj-$(CONFIG_SYSCTL) += utsname_sysctl.o
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obj-$(CONFIG_UTS_NS) += utsname.o
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obj-$(CONFIG_TASK_DELAY_ACCT) += delayacct.o
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obj-$(CONFIG_TASKSTATS) += taskstats.o tsacct.o
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117
kernel/sysctl.c
117
kernel/sysctl.c
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@ -135,13 +135,6 @@ static int parse_table(int __user *, int, void __user *, size_t __user *,
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void __user *, size_t, ctl_table *);
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#endif
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static int proc_do_uts_string(ctl_table *table, int write, struct file *filp,
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void __user *buffer, size_t *lenp, loff_t *ppos);
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static int sysctl_uts_string(ctl_table *table, int __user *name, int nlen,
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void __user *oldval, size_t __user *oldlenp,
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void __user *newval, size_t newlen);
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#ifdef CONFIG_SYSVIPC
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static int sysctl_ipc_data(ctl_table *table, int __user *name, int nlen,
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void __user *oldval, size_t __user *oldlenp,
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@ -176,29 +169,6 @@ extern ctl_table inotify_table[];
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int sysctl_legacy_va_layout;
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#endif
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static void *get_uts(ctl_table *table, int write)
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{
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char *which = table->data;
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#ifdef CONFIG_UTS_NS
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struct uts_namespace *uts_ns = current->nsproxy->uts_ns;
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which = (which - (char *)&init_uts_ns) + (char *)uts_ns;
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#endif
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if (!write)
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down_read(&uts_sem);
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else
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down_write(&uts_sem);
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return which;
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}
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static void put_uts(ctl_table *table, int write, void *which)
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{
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if (!write)
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up_read(&uts_sem);
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else
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up_write(&uts_sem);
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}
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#ifdef CONFIG_SYSVIPC
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static void *get_ipc(ctl_table *table, int write)
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{
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@ -277,51 +247,6 @@ static ctl_table root_table[] = {
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};
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static ctl_table kern_table[] = {
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{
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.ctl_name = KERN_OSTYPE,
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.procname = "ostype",
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.data = init_uts_ns.name.sysname,
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.maxlen = sizeof(init_uts_ns.name.sysname),
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.mode = 0444,
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.proc_handler = &proc_do_uts_string,
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.strategy = &sysctl_uts_string,
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},
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{
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.ctl_name = KERN_OSRELEASE,
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.procname = "osrelease",
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.data = init_uts_ns.name.release,
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.maxlen = sizeof(init_uts_ns.name.release),
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.mode = 0444,
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.proc_handler = &proc_do_uts_string,
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.strategy = &sysctl_uts_string,
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},
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{
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.ctl_name = KERN_VERSION,
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.procname = "version",
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.data = init_uts_ns.name.version,
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.maxlen = sizeof(init_uts_ns.name.version),
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.mode = 0444,
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.proc_handler = &proc_do_uts_string,
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.strategy = &sysctl_uts_string,
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},
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{
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.ctl_name = KERN_NODENAME,
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.procname = "hostname",
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.data = init_uts_ns.name.nodename,
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.maxlen = sizeof(init_uts_ns.name.nodename),
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.mode = 0644,
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.proc_handler = &proc_do_uts_string,
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.strategy = &sysctl_uts_string,
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},
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{
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.ctl_name = KERN_DOMAINNAME,
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.procname = "domainname",
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.data = init_uts_ns.name.domainname,
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.maxlen = sizeof(init_uts_ns.name.domainname),
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.mode = 0644,
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.proc_handler = &proc_do_uts_string,
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.strategy = &sysctl_uts_string,
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},
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{
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.ctl_name = KERN_PANIC,
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.procname = "panic",
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@ -1759,21 +1684,6 @@ int proc_dostring(ctl_table *table, int write, struct file *filp,
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buffer, lenp, ppos);
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}
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/*
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* Special case of dostring for the UTS structure. This has locks
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* to observe. Should this be in kernel/sys.c ????
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*/
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static int proc_do_uts_string(ctl_table *table, int write, struct file *filp,
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void __user *buffer, size_t *lenp, loff_t *ppos)
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{
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int r;
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void *which;
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which = get_uts(table, write);
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r = _proc_do_string(which, table->maxlen,write,filp,buffer,lenp, ppos);
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put_uts(table, write, which);
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return r;
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}
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static int do_proc_dointvec_conv(int *negp, unsigned long *lvalp,
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int *valp,
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@ -2410,12 +2320,6 @@ int proc_dostring(ctl_table *table, int write, struct file *filp,
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return -ENOSYS;
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}
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static int proc_do_uts_string(ctl_table *table, int write, struct file *filp,
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void __user *buffer, size_t *lenp, loff_t *ppos)
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{
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return -ENOSYS;
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}
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#ifdef CONFIG_SYSVIPC
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static int proc_do_ipc_string(ctl_table *table, int write, struct file *filp,
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void __user *buffer, size_t *lenp, loff_t *ppos)
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@ -2645,21 +2549,6 @@ int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen,
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}
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/* The generic string strategy routine: */
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static int sysctl_uts_string(ctl_table *table, int __user *name, int nlen,
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void __user *oldval, size_t __user *oldlenp,
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void __user *newval, size_t newlen)
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{
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struct ctl_table uts_table;
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int r, write;
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write = newval && newlen;
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memcpy(&uts_table, table, sizeof(uts_table));
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uts_table.data = get_uts(table, write);
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r = sysctl_string(&uts_table, name, nlen,
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oldval, oldlenp, newval, newlen);
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put_uts(table, write, uts_table.data);
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return r;
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}
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#ifdef CONFIG_SYSVIPC
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/* The generic sysctl ipc data routine. */
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@ -2766,12 +2655,6 @@ int sysctl_ms_jiffies(ctl_table *table, int __user *name, int nlen,
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return -ENOSYS;
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}
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static int sysctl_uts_string(ctl_table *table, int __user *name, int nlen,
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void __user *oldval, size_t __user *oldlenp,
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void __user *newval, size_t newlen)
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{
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return -ENOSYS;
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}
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#ifdef CONFIG_SYSVIPC
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static int sysctl_ipc_data(ctl_table *table, int __user *name, int nlen,
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void __user *oldval, size_t __user *oldlenp,
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146
kernel/utsname_sysctl.c
Normal file
146
kernel/utsname_sysctl.c
Normal file
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@ -0,0 +1,146 @@
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/*
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* Copyright (C) 2007
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*
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* Author: Eric Biederman <ebiederm@xmision.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2 of the
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* License.
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*/
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#include <linux/module.h>
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#include <linux/uts.h>
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#include <linux/utsname.h>
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#include <linux/version.h>
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#include <linux/sysctl.h>
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static void *get_uts(ctl_table *table, int write)
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{
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char *which = table->data;
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#ifdef CONFIG_UTS_NS
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struct uts_namespace *uts_ns = current->nsproxy->uts_ns;
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which = (which - (char *)&init_uts_ns) + (char *)uts_ns;
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#endif
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if (!write)
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down_read(&uts_sem);
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else
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down_write(&uts_sem);
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return which;
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}
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static void put_uts(ctl_table *table, int write, void *which)
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{
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if (!write)
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up_read(&uts_sem);
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else
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up_write(&uts_sem);
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}
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#ifdef CONFIG_PROC_FS
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/*
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* Special case of dostring for the UTS structure. This has locks
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* to observe. Should this be in kernel/sys.c ????
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*/
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static int proc_do_uts_string(ctl_table *table, int write, struct file *filp,
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void __user *buffer, size_t *lenp, loff_t *ppos)
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{
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struct ctl_table uts_table;
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int r;
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memcpy(&uts_table, table, sizeof(uts_table));
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uts_table.data = get_uts(table, write);
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r = proc_dostring(&uts_table,write,filp,buffer,lenp, ppos);
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put_uts(table, write, uts_table.data);
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return r;
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}
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#else
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#define proc_do_uts_string NULL
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#endif
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#ifdef CONFIG_SYSCTL_SYSCALL
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/* The generic string strategy routine: */
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static int sysctl_uts_string(ctl_table *table, int __user *name, int nlen,
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void __user *oldval, size_t __user *oldlenp,
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void __user *newval, size_t newlen)
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{
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struct ctl_table uts_table;
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int r, write;
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write = newval && newlen;
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memcpy(&uts_table, table, sizeof(uts_table));
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uts_table.data = get_uts(table, write);
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r = sysctl_string(&uts_table, name, nlen,
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oldval, oldlenp, newval, newlen);
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put_uts(table, write, uts_table.data);
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return r;
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}
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#else
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#define sysctl_uts_string NULL
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#endif
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static struct ctl_table uts_kern_table[] = {
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{
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.ctl_name = KERN_OSTYPE,
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.procname = "ostype",
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.data = init_uts_ns.name.sysname,
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.maxlen = sizeof(init_uts_ns.name.sysname),
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.mode = 0444,
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.proc_handler = proc_do_uts_string,
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.strategy = sysctl_uts_string,
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},
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{
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.ctl_name = KERN_OSRELEASE,
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.procname = "osrelease",
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.data = init_uts_ns.name.release,
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.maxlen = sizeof(init_uts_ns.name.release),
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.mode = 0444,
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.proc_handler = proc_do_uts_string,
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.strategy = sysctl_uts_string,
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},
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{
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.ctl_name = KERN_VERSION,
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.procname = "version",
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.data = init_uts_ns.name.version,
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.maxlen = sizeof(init_uts_ns.name.version),
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.mode = 0444,
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.proc_handler = proc_do_uts_string,
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.strategy = sysctl_uts_string,
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},
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{
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.ctl_name = KERN_NODENAME,
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.procname = "hostname",
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.data = init_uts_ns.name.nodename,
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.maxlen = sizeof(init_uts_ns.name.nodename),
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.mode = 0644,
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.proc_handler = proc_do_uts_string,
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.strategy = sysctl_uts_string,
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},
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{
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.ctl_name = KERN_DOMAINNAME,
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.procname = "domainname",
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.data = init_uts_ns.name.domainname,
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.maxlen = sizeof(init_uts_ns.name.domainname),
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.mode = 0644,
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.proc_handler = proc_do_uts_string,
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.strategy = sysctl_uts_string,
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},
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{}
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};
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static struct ctl_table uts_root_table[] = {
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{
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.ctl_name = CTL_KERN,
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.procname = "kernel",
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.mode = 0555,
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.child = uts_kern_table,
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},
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{}
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};
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static int __init utsname_sysctl_init(void)
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{
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register_sysctl_table(uts_root_table, 0);
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return 0;
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}
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__initcall(utsname_sysctl_init);
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