cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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mq_sysctl.c (3064B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 *  Copyright (C) 2007 IBM Corporation
      4 *
      5 *  Author: Cedric Le Goater <clg@fr.ibm.com>
      6 */
      7
      8#include <linux/nsproxy.h>
      9#include <linux/ipc_namespace.h>
     10#include <linux/sysctl.h>
     11
     12#include <linux/stat.h>
     13#include <linux/capability.h>
     14#include <linux/slab.h>
     15
     16static int msg_max_limit_min = MIN_MSGMAX;
     17static int msg_max_limit_max = HARD_MSGMAX;
     18
     19static int msg_maxsize_limit_min = MIN_MSGSIZEMAX;
     20static int msg_maxsize_limit_max = HARD_MSGSIZEMAX;
     21
     22static struct ctl_table mq_sysctls[] = {
     23	{
     24		.procname	= "queues_max",
     25		.data		= &init_ipc_ns.mq_queues_max,
     26		.maxlen		= sizeof(int),
     27		.mode		= 0644,
     28		.proc_handler	= proc_dointvec,
     29	},
     30	{
     31		.procname	= "msg_max",
     32		.data		= &init_ipc_ns.mq_msg_max,
     33		.maxlen		= sizeof(int),
     34		.mode		= 0644,
     35		.proc_handler	= proc_dointvec_minmax,
     36		.extra1		= &msg_max_limit_min,
     37		.extra2		= &msg_max_limit_max,
     38	},
     39	{
     40		.procname	= "msgsize_max",
     41		.data		= &init_ipc_ns.mq_msgsize_max,
     42		.maxlen		= sizeof(int),
     43		.mode		= 0644,
     44		.proc_handler	= proc_dointvec_minmax,
     45		.extra1		= &msg_maxsize_limit_min,
     46		.extra2		= &msg_maxsize_limit_max,
     47	},
     48	{
     49		.procname	= "msg_default",
     50		.data		= &init_ipc_ns.mq_msg_default,
     51		.maxlen		= sizeof(int),
     52		.mode		= 0644,
     53		.proc_handler	= proc_dointvec_minmax,
     54		.extra1		= &msg_max_limit_min,
     55		.extra2		= &msg_max_limit_max,
     56	},
     57	{
     58		.procname	= "msgsize_default",
     59		.data		= &init_ipc_ns.mq_msgsize_default,
     60		.maxlen		= sizeof(int),
     61		.mode		= 0644,
     62		.proc_handler	= proc_dointvec_minmax,
     63		.extra1		= &msg_maxsize_limit_min,
     64		.extra2		= &msg_maxsize_limit_max,
     65	},
     66	{}
     67};
     68
     69static struct ctl_table_set *set_lookup(struct ctl_table_root *root)
     70{
     71	return &current->nsproxy->ipc_ns->mq_set;
     72}
     73
     74static int set_is_seen(struct ctl_table_set *set)
     75{
     76	return &current->nsproxy->ipc_ns->mq_set == set;
     77}
     78
     79static struct ctl_table_root set_root = {
     80	.lookup = set_lookup,
     81};
     82
     83bool setup_mq_sysctls(struct ipc_namespace *ns)
     84{
     85	struct ctl_table *tbl;
     86
     87	setup_sysctl_set(&ns->mq_set, &set_root, set_is_seen);
     88
     89	tbl = kmemdup(mq_sysctls, sizeof(mq_sysctls), GFP_KERNEL);
     90	if (tbl) {
     91		int i;
     92
     93		for (i = 0; i < ARRAY_SIZE(mq_sysctls); i++) {
     94			if (tbl[i].data == &init_ipc_ns.mq_queues_max)
     95				tbl[i].data = &ns->mq_queues_max;
     96
     97			else if (tbl[i].data == &init_ipc_ns.mq_msg_max)
     98				tbl[i].data = &ns->mq_msg_max;
     99
    100			else if (tbl[i].data == &init_ipc_ns.mq_msgsize_max)
    101				tbl[i].data = &ns->mq_msgsize_max;
    102
    103			else if (tbl[i].data == &init_ipc_ns.mq_msg_default)
    104				tbl[i].data = &ns->mq_msg_default;
    105
    106			else if (tbl[i].data == &init_ipc_ns.mq_msgsize_default)
    107				tbl[i].data = &ns->mq_msgsize_default;
    108			else
    109				tbl[i].data = NULL;
    110		}
    111
    112		ns->mq_sysctls = __register_sysctl_table(&ns->mq_set, "fs/mqueue", tbl);
    113	}
    114	if (!ns->mq_sysctls) {
    115		kfree(tbl);
    116		retire_sysctl_set(&ns->mq_set);
    117		return false;
    118	}
    119
    120	return true;
    121}
    122
    123void retire_mq_sysctls(struct ipc_namespace *ns)
    124{
    125	struct ctl_table *tbl;
    126
    127	tbl = ns->mq_sysctls->ctl_table_arg;
    128	unregister_sysctl_table(ns->mq_sysctls);
    129	retire_sysctl_set(&ns->mq_set);
    130	kfree(tbl);
    131}