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ae5e1b22f1
Currently the IPC namespace management code is spread over the ipc/*.c files. I moved this code into ipc/namespace.c file which is compiled out when needed. The linux/ipc_namespace.h file is used to store the prototypes of the functions in namespace.c and the stubs for NAMESPACES=n case. This is done so, because the stub for copy_ipc_namespace requires the knowledge of the CLONE_NEWIPC flag, which is in sched.h. But the linux/ipc.h file itself in included into many many .c files via the sys.h->sem.h sequence so adding the sched.h into it will make all these .c depend on sched.h which is not that good. On the other hand the knowledge about the namespaces stuff is required in 4 .c files only. Besides, this patch compiles out some auxiliary functions from ipc/sem.c, msg.c and shm.c files. It turned out that moving these functions into namespaces.c is not that easy because they use many other calls and macros from the original file. Moving them would make this patch complicated. On the other hand all these functions can be consolidated, so I will send a separate patch doing this a bit later. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Acked-by: Serge Hallyn <serue@us.ibm.com> Cc: Cedric Le Goater <clg@fr.ibm.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Herbert Poetzl <herbert@13thfloor.at> Cc: Kirill Korotaev <dev@sw.ru> Cc: Sukadev Bhattiprolu <sukadev@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
181 lines
4.1 KiB
C
181 lines
4.1 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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static void *get_ipc(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_FS
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static int proc_ipc_dointvec(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 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, filp, buffer, lenp, ppos);
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}
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static int proc_ipc_doulongvec_minmax(ctl_table *table, int write,
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struct file *filp, 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, filp, buffer,
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lenp, ppos);
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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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#endif
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#ifdef CONFIG_SYSCTL_SYSCALL
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/* The generic sysctl ipc data routine. */
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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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void __user *newval, size_t newlen)
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{
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size_t len;
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void *data;
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/* Get out of I don't have a variable */
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if (!table->data || !table->maxlen)
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return -ENOTDIR;
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data = get_ipc(table);
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if (!data)
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return -ENOTDIR;
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if (oldval && oldlenp) {
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if (get_user(len, oldlenp))
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return -EFAULT;
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if (len) {
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if (len > table->maxlen)
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len = table->maxlen;
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if (copy_to_user(oldval, data, len))
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return -EFAULT;
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if (put_user(len, oldlenp))
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return -EFAULT;
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}
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}
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if (newval && newlen) {
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if (newlen > table->maxlen)
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newlen = table->maxlen;
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if (copy_from_user(data, newval, newlen))
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return -EFAULT;
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}
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return 1;
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}
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#else
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#define sysctl_ipc_data NULL
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#endif
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static struct ctl_table ipc_kern_table[] = {
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{
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.ctl_name = KERN_SHMMAX,
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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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.strategy = sysctl_ipc_data,
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},
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{
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.ctl_name = KERN_SHMALL,
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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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.strategy = sysctl_ipc_data,
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},
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{
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.ctl_name = KERN_SHMMNI,
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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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.strategy = sysctl_ipc_data,
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},
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{
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.ctl_name = KERN_MSGMAX,
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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,
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.strategy = sysctl_ipc_data,
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},
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{
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.ctl_name = KERN_MSGMNI,
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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_dointvec,
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.strategy = sysctl_ipc_data,
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},
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{
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.ctl_name = KERN_MSGMNB,
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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,
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.strategy = sysctl_ipc_data,
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},
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{
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.ctl_name = KERN_SEM,
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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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.strategy = sysctl_ipc_data,
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},
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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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.ctl_name = CTL_KERN,
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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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__initcall(ipc_sysctl_init);
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