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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 | /* * Copyright (C) 2007 IBM Corporation * * Author: Cedric Le Goater <clg@fr.ibm.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/nsproxy.h> #include <linux/ipc_namespace.h> #include <linux/sysctl.h> /* * Define the ranges various user-specified maximum values can * be set to. */ #define MIN_MSGMAX 1 /* min value for msg_max */ #define MAX_MSGMAX HARD_MSGMAX /* max value for msg_max */ #define MIN_MSGSIZEMAX 128 /* min value for msgsize_max */ #define MAX_MSGSIZEMAX (8192*128) /* max value for msgsize_max */ #ifdef CONFIG_PROC_SYSCTL static void *get_mq(ctl_table *table) { char *which = table->data; struct ipc_namespace *ipc_ns = current->nsproxy->ipc_ns; which = (which - (char *)&init_ipc_ns) + (char *)ipc_ns; return which; } static int proc_mq_dointvec(ctl_table *table, int write, void __user *buffer, size_t *lenp, loff_t *ppos) { struct ctl_table mq_table; memcpy(&mq_table, table, sizeof(mq_table)); mq_table.data = get_mq(table); return proc_dointvec(&mq_table, write, buffer, lenp, ppos); } static int proc_mq_dointvec_minmax(ctl_table *table, int write, void __user *buffer, size_t *lenp, loff_t *ppos) { struct ctl_table mq_table; memcpy(&mq_table, table, sizeof(mq_table)); mq_table.data = get_mq(table); return proc_dointvec_minmax(&mq_table, write, buffer, lenp, ppos); } #else #define proc_mq_dointvec NULL #define proc_mq_dointvec_minmax NULL #endif static int msg_max_limit_min = MIN_MSGMAX; static int msg_max_limit_max = MAX_MSGMAX; static int msg_maxsize_limit_min = MIN_MSGSIZEMAX; static int msg_maxsize_limit_max = MAX_MSGSIZEMAX; static ctl_table mq_sysctls[] = { { .procname = "queues_max", .data = &init_ipc_ns.mq_queues_max, .maxlen = sizeof(int), .mode = 0644, .proc_handler = proc_mq_dointvec, }, { .procname = "msg_max", .data = &init_ipc_ns.mq_msg_max, .maxlen = sizeof(int), .mode = 0644, .proc_handler = proc_mq_dointvec_minmax, .extra1 = &msg_max_limit_min, .extra2 = &msg_max_limit_max, }, { .procname = "msgsize_max", .data = &init_ipc_ns.mq_msgsize_max, .maxlen = sizeof(int), .mode = 0644, .proc_handler = proc_mq_dointvec_minmax, .extra1 = &msg_maxsize_limit_min, .extra2 = &msg_maxsize_limit_max, }, {} }; static ctl_table mq_sysctl_dir[] = { { .procname = "mqueue", .mode = 0555, .child = mq_sysctls, }, {} }; static ctl_table mq_sysctl_root[] = { { .procname = "fs", .mode = 0555, .child = mq_sysctl_dir, }, {} }; struct ctl_table_header *mq_register_sysctl_table(void) { return register_sysctl_table(mq_sysctl_root); } |