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bff97cf11b
We make these changes in order to prepare __register_sysctl_table and its callers for when we remove the sentinel element (empty element at the end of ctl_table arrays). We don't actually remove any sentinels in this commit, but we *do* make sure to use ARRAY_SIZE so the table_size is available when the removal occurs. We add a table_size argument to __register_sysctl_table and adjust callers, all of which pass ctl_table pointers and need an explicit call to ARRAY_SIZE. We implement a size calculation in register_net_sysctl in order to forward the size of the array pointer received from the network register calls. The new table_size argument does not yet have any effect in the init_header call which is still dependent on the sentinel's presence. table_size *does* however drive the `kzalloc` allocation in __register_sysctl_table with no adverse effects as the allocated memory is either one element greater than the calculated ctl_table array (for the calls in ipc_sysctl.c, mq_sysctl.c and ucount.c) or the exact size of the calculated ctl_table array (for the call from sysctl_net.c and register_sysctl). This approach will allows us to "just" remove the sentinel without further changes to __register_sysctl_table as table_size will represent the exact size for all the callers at that point. Signed-off-by: Joel Granados <j.granados@samsung.com> Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
134 lines
3.0 KiB
C
134 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2007 IBM Corporation
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*
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* Author: Cedric Le Goater <clg@fr.ibm.com>
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*/
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#include <linux/nsproxy.h>
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#include <linux/ipc_namespace.h>
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#include <linux/sysctl.h>
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#include <linux/stat.h>
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#include <linux/capability.h>
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#include <linux/slab.h>
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static int msg_max_limit_min = MIN_MSGMAX;
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static int msg_max_limit_max = HARD_MSGMAX;
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static int msg_maxsize_limit_min = MIN_MSGSIZEMAX;
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static int msg_maxsize_limit_max = HARD_MSGSIZEMAX;
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static struct ctl_table mq_sysctls[] = {
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{
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.procname = "queues_max",
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.data = &init_ipc_ns.mq_queues_max,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec,
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},
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{
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.procname = "msg_max",
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.data = &init_ipc_ns.mq_msg_max,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = &msg_max_limit_min,
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.extra2 = &msg_max_limit_max,
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},
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{
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.procname = "msgsize_max",
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.data = &init_ipc_ns.mq_msgsize_max,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = &msg_maxsize_limit_min,
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.extra2 = &msg_maxsize_limit_max,
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},
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{
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.procname = "msg_default",
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.data = &init_ipc_ns.mq_msg_default,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = &msg_max_limit_min,
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.extra2 = &msg_max_limit_max,
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},
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{
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.procname = "msgsize_default",
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.data = &init_ipc_ns.mq_msgsize_default,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = &msg_maxsize_limit_min,
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.extra2 = &msg_maxsize_limit_max,
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},
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{}
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};
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static struct ctl_table_set *set_lookup(struct ctl_table_root *root)
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{
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return ¤t->nsproxy->ipc_ns->mq_set;
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}
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static int set_is_seen(struct ctl_table_set *set)
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{
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return ¤t->nsproxy->ipc_ns->mq_set == set;
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}
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static struct ctl_table_root set_root = {
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.lookup = set_lookup,
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};
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bool setup_mq_sysctls(struct ipc_namespace *ns)
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{
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struct ctl_table *tbl;
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setup_sysctl_set(&ns->mq_set, &set_root, set_is_seen);
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tbl = kmemdup(mq_sysctls, sizeof(mq_sysctls), GFP_KERNEL);
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if (tbl) {
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int i;
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for (i = 0; i < ARRAY_SIZE(mq_sysctls); i++) {
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if (tbl[i].data == &init_ipc_ns.mq_queues_max)
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tbl[i].data = &ns->mq_queues_max;
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else if (tbl[i].data == &init_ipc_ns.mq_msg_max)
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tbl[i].data = &ns->mq_msg_max;
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else if (tbl[i].data == &init_ipc_ns.mq_msgsize_max)
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tbl[i].data = &ns->mq_msgsize_max;
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else if (tbl[i].data == &init_ipc_ns.mq_msg_default)
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tbl[i].data = &ns->mq_msg_default;
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else if (tbl[i].data == &init_ipc_ns.mq_msgsize_default)
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tbl[i].data = &ns->mq_msgsize_default;
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else
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tbl[i].data = NULL;
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}
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ns->mq_sysctls = __register_sysctl_table(&ns->mq_set,
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"fs/mqueue", tbl,
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ARRAY_SIZE(mq_sysctls));
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}
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if (!ns->mq_sysctls) {
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kfree(tbl);
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retire_sysctl_set(&ns->mq_set);
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return false;
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}
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return true;
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}
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void retire_mq_sysctls(struct ipc_namespace *ns)
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{
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struct ctl_table *tbl;
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tbl = ns->mq_sysctls->ctl_table_arg;
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unregister_sysctl_table(ns->mq_sysctls);
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retire_sysctl_set(&ns->mq_set);
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kfree(tbl);
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}
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