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253 lines
6.1 KiB
253 lines
6.1 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) 2007 |
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* |
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* Author: Eric Biederman <[email protected]> |
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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 *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 *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 *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_doulongvec_minmax(struct ctl_table *table, int write, |
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void *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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static int proc_ipc_auto_msgmni(struct ctl_table *table, int write, |
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void *buffer, size_t *lenp, loff_t *ppos) |
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{ |
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struct ctl_table ipc_table; |
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int dummy = 0; |
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memcpy(&ipc_table, table, sizeof(ipc_table)); |
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ipc_table.data = &dummy; |
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if (write) |
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pr_info_once("writing to auto_msgmni has no effect"); |
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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_sem_dointvec(struct ctl_table *table, int write, |
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void *buffer, size_t *lenp, loff_t *ppos) |
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{ |
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int ret, semmni; |
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struct ipc_namespace *ns = current->nsproxy->ipc_ns; |
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semmni = ns->sem_ctls[3]; |
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ret = proc_ipc_dointvec(table, write, buffer, lenp, ppos); |
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if (!ret) |
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ret = sem_check_semmni(current->nsproxy->ipc_ns); |
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/* |
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* Reset the semmni value if an error happens. |
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*/ |
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if (ret) |
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ns->sem_ctls[3] = semmni; |
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return ret; |
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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_auto_msgmni NULL |
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#define proc_ipc_sem_dointvec NULL |
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#endif |
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int ipc_mni = IPCMNI; |
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int ipc_mni_shift = IPCMNI_SHIFT; |
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int ipc_min_cycle = RADIX_TREE_MAP_SIZE; |
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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_minmax, |
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.extra1 = SYSCTL_ZERO, |
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.extra2 = &ipc_mni, |
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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 = SYSCTL_ZERO, |
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.extra2 = SYSCTL_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 = SYSCTL_ZERO, |
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.extra2 = SYSCTL_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_dointvec_minmax, |
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.extra1 = SYSCTL_ZERO, |
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.extra2 = &ipc_mni, |
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}, |
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{ |
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.procname = "auto_msgmni", |
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.data = NULL, |
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.maxlen = sizeof(int), |
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.mode = 0644, |
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.proc_handler = proc_ipc_auto_msgmni, |
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.extra1 = SYSCTL_ZERO, |
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.extra2 = SYSCTL_ONE, |
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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 = SYSCTL_ZERO, |
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.extra2 = SYSCTL_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_sem_dointvec, |
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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 = SYSCTL_ZERO, |
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.extra2 = SYSCTL_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 = SYSCTL_ZERO, |
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.extra2 = SYSCTL_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 = SYSCTL_ZERO, |
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.extra2 = SYSCTL_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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static int __init ipc_mni_extend(char *str) |
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{ |
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ipc_mni = IPCMNI_EXTEND; |
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ipc_mni_shift = IPCMNI_EXTEND_SHIFT; |
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ipc_min_cycle = IPCMNI_EXTEND_MIN_CYCLE; |
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pr_info("IPCMNI extended to %d.\n", ipc_mni); |
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return 0; |
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} |
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early_param("ipcmni_extend", ipc_mni_extend);
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