285 lines
7.1 KiB
C
285 lines
7.1 KiB
C
/*
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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/ipc.h>
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#include <linux/nsproxy.h>
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#include <linux/sysctl.h>
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#include <linux/uaccess.h>
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#include <linux/ipc_namespace.h>
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#include <linux/msg.h>
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#include "util.h"
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static void *get_ipc(struct ctl_table *table)
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{
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char *which = table->data;
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struct ipc_namespace *ipc_ns = current->nsproxy->ipc_ns;
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which = (which - (char *)&init_ipc_ns) + (char *)ipc_ns;
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return which;
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}
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#ifdef CONFIG_PROC_SYSCTL
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static int proc_ipc_dointvec(struct ctl_table *table, int write,
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void __user *buffer, size_t *lenp, loff_t *ppos)
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{
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struct ctl_table ipc_table;
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memcpy(&ipc_table, table, sizeof(ipc_table));
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ipc_table.data = get_ipc(table);
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return proc_dointvec(&ipc_table, write, buffer, lenp, ppos);
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}
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static int proc_ipc_dointvec_minmax(struct ctl_table *table, int write,
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void __user *buffer, size_t *lenp, loff_t *ppos)
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{
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struct ctl_table ipc_table;
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memcpy(&ipc_table, table, sizeof(ipc_table));
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ipc_table.data = get_ipc(table);
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return proc_dointvec_minmax(&ipc_table, write, buffer, lenp, ppos);
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}
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static int proc_ipc_dointvec_minmax_orphans(struct ctl_table *table, int write,
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void __user *buffer, size_t *lenp, loff_t *ppos)
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{
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struct ipc_namespace *ns = current->nsproxy->ipc_ns;
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int err = proc_ipc_dointvec_minmax(table, write, buffer, lenp, ppos);
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if (err < 0)
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return err;
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if (ns->shm_rmid_forced)
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shm_destroy_orphaned(ns);
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return err;
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}
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static int proc_ipc_callback_dointvec_minmax(struct ctl_table *table, int write,
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void __user *buffer, size_t *lenp, loff_t *ppos)
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{
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struct ctl_table ipc_table;
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size_t lenp_bef = *lenp;
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int rc;
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memcpy(&ipc_table, table, sizeof(ipc_table));
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ipc_table.data = get_ipc(table);
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rc = proc_dointvec_minmax(&ipc_table, write, buffer, lenp, ppos);
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if (write && !rc && lenp_bef == *lenp)
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/*
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* Tunable has successfully been changed by hand. Disable its
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* automatic adjustment. This simply requires unregistering
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* the notifiers that trigger recalculation.
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*/
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unregister_ipcns_notifier(current->nsproxy->ipc_ns);
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return rc;
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}
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static int proc_ipc_doulongvec_minmax(struct ctl_table *table, int write,
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void __user *buffer, size_t *lenp, loff_t *ppos)
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{
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struct ctl_table ipc_table;
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memcpy(&ipc_table, table, sizeof(ipc_table));
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ipc_table.data = get_ipc(table);
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return proc_doulongvec_minmax(&ipc_table, write, buffer,
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lenp, ppos);
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}
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/*
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* Routine that is called when the file "auto_msgmni" has successfully been
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* written.
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* Two values are allowed:
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* 0: unregister msgmni's callback routine from the ipc namespace notifier
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* chain. This means that msgmni won't be recomputed anymore upon memory
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* add/remove or ipc namespace creation/removal.
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* 1: register back the callback routine.
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*/
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static void ipc_auto_callback(int val)
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{
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if (!val)
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unregister_ipcns_notifier(current->nsproxy->ipc_ns);
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else {
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/*
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* Re-enable automatic recomputing only if not already
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* enabled.
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*/
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recompute_msgmni(current->nsproxy->ipc_ns);
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cond_register_ipcns_notifier(current->nsproxy->ipc_ns);
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}
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}
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static int proc_ipcauto_dointvec_minmax(struct ctl_table *table, int write,
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void __user *buffer, size_t *lenp, loff_t *ppos)
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{
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struct ctl_table ipc_table;
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size_t lenp_bef = *lenp;
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int oldval;
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int rc;
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memcpy(&ipc_table, table, sizeof(ipc_table));
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ipc_table.data = get_ipc(table);
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oldval = *((int *)(ipc_table.data));
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rc = proc_dointvec_minmax(&ipc_table, write, buffer, lenp, ppos);
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if (write && !rc && lenp_bef == *lenp) {
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int newval = *((int *)(ipc_table.data));
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/*
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* The file "auto_msgmni" has correctly been set.
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* React by (un)registering the corresponding tunable, if the
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* value has changed.
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*/
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if (newval != oldval)
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ipc_auto_callback(newval);
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}
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return rc;
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}
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#else
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#define proc_ipc_doulongvec_minmax NULL
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#define proc_ipc_dointvec NULL
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#define proc_ipc_dointvec_minmax NULL
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#define proc_ipc_dointvec_minmax_orphans NULL
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#define proc_ipc_callback_dointvec_minmax NULL
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#define proc_ipcauto_dointvec_minmax NULL
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#endif
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static int zero;
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static int one = 1;
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static int int_max = INT_MAX;
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static struct ctl_table ipc_kern_table[] = {
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{
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.procname = "shmmax",
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.data = &init_ipc_ns.shm_ctlmax,
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.maxlen = sizeof(init_ipc_ns.shm_ctlmax),
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.mode = 0644,
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.proc_handler = proc_ipc_doulongvec_minmax,
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},
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{
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.procname = "shmall",
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.data = &init_ipc_ns.shm_ctlall,
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.maxlen = sizeof(init_ipc_ns.shm_ctlall),
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.mode = 0644,
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.proc_handler = proc_ipc_doulongvec_minmax,
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},
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{
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.procname = "shmmni",
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.data = &init_ipc_ns.shm_ctlmni,
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.maxlen = sizeof(init_ipc_ns.shm_ctlmni),
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.mode = 0644,
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.proc_handler = proc_ipc_dointvec,
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},
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{
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.procname = "shm_rmid_forced",
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.data = &init_ipc_ns.shm_rmid_forced,
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.maxlen = sizeof(init_ipc_ns.shm_rmid_forced),
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.mode = 0644,
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.proc_handler = proc_ipc_dointvec_minmax_orphans,
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.extra1 = &zero,
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.extra2 = &one,
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},
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{
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.procname = "msgmax",
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.data = &init_ipc_ns.msg_ctlmax,
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.maxlen = sizeof(init_ipc_ns.msg_ctlmax),
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.mode = 0644,
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.proc_handler = proc_ipc_dointvec_minmax,
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.extra1 = &zero,
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.extra2 = &int_max,
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},
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{
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.procname = "msgmni",
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.data = &init_ipc_ns.msg_ctlmni,
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.maxlen = sizeof(init_ipc_ns.msg_ctlmni),
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.mode = 0644,
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.proc_handler = proc_ipc_callback_dointvec_minmax,
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.extra1 = &zero,
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.extra2 = &int_max,
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},
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{
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.procname = "msgmnb",
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.data = &init_ipc_ns.msg_ctlmnb,
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.maxlen = sizeof(init_ipc_ns.msg_ctlmnb),
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.mode = 0644,
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.proc_handler = proc_ipc_dointvec_minmax,
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.extra1 = &zero,
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.extra2 = &int_max,
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},
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{
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.procname = "sem",
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.data = &init_ipc_ns.sem_ctls,
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.maxlen = 4*sizeof(int),
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.mode = 0644,
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.proc_handler = proc_ipc_dointvec,
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},
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{
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.procname = "auto_msgmni",
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.data = &init_ipc_ns.auto_msgmni,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_ipcauto_dointvec_minmax,
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.extra1 = &zero,
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.extra2 = &one,
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},
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#ifdef CONFIG_CHECKPOINT_RESTORE
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{
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.procname = "sem_next_id",
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.data = &init_ipc_ns.ids[IPC_SEM_IDS].next_id,
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.maxlen = sizeof(init_ipc_ns.ids[IPC_SEM_IDS].next_id),
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.mode = 0644,
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.proc_handler = proc_ipc_dointvec_minmax,
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.extra1 = &zero,
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.extra2 = &int_max,
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},
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{
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.procname = "msg_next_id",
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.data = &init_ipc_ns.ids[IPC_MSG_IDS].next_id,
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.maxlen = sizeof(init_ipc_ns.ids[IPC_MSG_IDS].next_id),
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.mode = 0644,
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.proc_handler = proc_ipc_dointvec_minmax,
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.extra1 = &zero,
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.extra2 = &int_max,
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},
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{
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.procname = "shm_next_id",
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.data = &init_ipc_ns.ids[IPC_SHM_IDS].next_id,
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.maxlen = sizeof(init_ipc_ns.ids[IPC_SHM_IDS].next_id),
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.mode = 0644,
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.proc_handler = proc_ipc_dointvec_minmax,
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.extra1 = &zero,
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.extra2 = &int_max,
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},
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#endif
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{}
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};
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static struct ctl_table ipc_root_table[] = {
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{
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.procname = "kernel",
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.mode = 0555,
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.child = ipc_kern_table,
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},
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{}
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};
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static int __init ipc_sysctl_init(void)
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{
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register_sysctl_table(ipc_root_table);
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return 0;
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}
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device_initcall(ipc_sysctl_init);
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