mirror of
https://github.com/torvalds/linux.git
synced 2024-12-28 13:51:44 +00:00
38cd5b12b7
Fix coding style. In the previous commit, I added braces because,
in addition to changing .data, .extra1 also changed. Now this is not
needed.
Fixes: 1f5c135ee5 ("ipc: Store ipc sysctls in the ipc namespace")
Signed-off-by: Alexey Gladkov <legion@kernel.org>
Link: https://lkml.kernel.org/r/37687827f630bc150210f5b8abeeb00f1336814e.1651584847.git.legion@kernel.org
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
303 lines
7.2 KiB
C
303 lines
7.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Copyright (C) 2007
|
|
*
|
|
* Author: Eric Biederman <ebiederm@xmision.com>
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/ipc.h>
|
|
#include <linux/nsproxy.h>
|
|
#include <linux/sysctl.h>
|
|
#include <linux/uaccess.h>
|
|
#include <linux/capability.h>
|
|
#include <linux/ipc_namespace.h>
|
|
#include <linux/msg.h>
|
|
#include <linux/slab.h>
|
|
#include "util.h"
|
|
|
|
static int proc_ipc_dointvec_minmax_orphans(struct ctl_table *table, int write,
|
|
void *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
struct ipc_namespace *ns =
|
|
container_of(table->data, struct ipc_namespace, shm_rmid_forced);
|
|
int err;
|
|
|
|
err = proc_dointvec_minmax(table, write, buffer, lenp, ppos);
|
|
|
|
if (err < 0)
|
|
return err;
|
|
if (ns->shm_rmid_forced)
|
|
shm_destroy_orphaned(ns);
|
|
return err;
|
|
}
|
|
|
|
static int proc_ipc_auto_msgmni(struct ctl_table *table, int write,
|
|
void *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
struct ctl_table ipc_table;
|
|
int dummy = 0;
|
|
|
|
memcpy(&ipc_table, table, sizeof(ipc_table));
|
|
ipc_table.data = &dummy;
|
|
|
|
if (write)
|
|
pr_info_once("writing to auto_msgmni has no effect");
|
|
|
|
return proc_dointvec_minmax(&ipc_table, write, buffer, lenp, ppos);
|
|
}
|
|
|
|
static int proc_ipc_sem_dointvec(struct ctl_table *table, int write,
|
|
void *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
struct ipc_namespace *ns =
|
|
container_of(table->data, struct ipc_namespace, sem_ctls);
|
|
int ret, semmni;
|
|
|
|
semmni = ns->sem_ctls[3];
|
|
ret = proc_dointvec(table, write, buffer, lenp, ppos);
|
|
|
|
if (!ret)
|
|
ret = sem_check_semmni(ns);
|
|
|
|
/*
|
|
* Reset the semmni value if an error happens.
|
|
*/
|
|
if (ret)
|
|
ns->sem_ctls[3] = semmni;
|
|
return ret;
|
|
}
|
|
|
|
int ipc_mni = IPCMNI;
|
|
int ipc_mni_shift = IPCMNI_SHIFT;
|
|
int ipc_min_cycle = RADIX_TREE_MAP_SIZE;
|
|
|
|
static struct ctl_table ipc_sysctls[] = {
|
|
{
|
|
.procname = "shmmax",
|
|
.data = &init_ipc_ns.shm_ctlmax,
|
|
.maxlen = sizeof(init_ipc_ns.shm_ctlmax),
|
|
.mode = 0644,
|
|
.proc_handler = proc_doulongvec_minmax,
|
|
},
|
|
{
|
|
.procname = "shmall",
|
|
.data = &init_ipc_ns.shm_ctlall,
|
|
.maxlen = sizeof(init_ipc_ns.shm_ctlall),
|
|
.mode = 0644,
|
|
.proc_handler = proc_doulongvec_minmax,
|
|
},
|
|
{
|
|
.procname = "shmmni",
|
|
.data = &init_ipc_ns.shm_ctlmni,
|
|
.maxlen = sizeof(init_ipc_ns.shm_ctlmni),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = SYSCTL_ZERO,
|
|
.extra2 = &ipc_mni,
|
|
},
|
|
{
|
|
.procname = "shm_rmid_forced",
|
|
.data = &init_ipc_ns.shm_rmid_forced,
|
|
.maxlen = sizeof(init_ipc_ns.shm_rmid_forced),
|
|
.mode = 0644,
|
|
.proc_handler = proc_ipc_dointvec_minmax_orphans,
|
|
.extra1 = SYSCTL_ZERO,
|
|
.extra2 = SYSCTL_ONE,
|
|
},
|
|
{
|
|
.procname = "msgmax",
|
|
.data = &init_ipc_ns.msg_ctlmax,
|
|
.maxlen = sizeof(init_ipc_ns.msg_ctlmax),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = SYSCTL_ZERO,
|
|
.extra2 = SYSCTL_INT_MAX,
|
|
},
|
|
{
|
|
.procname = "msgmni",
|
|
.data = &init_ipc_ns.msg_ctlmni,
|
|
.maxlen = sizeof(init_ipc_ns.msg_ctlmni),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = SYSCTL_ZERO,
|
|
.extra2 = &ipc_mni,
|
|
},
|
|
{
|
|
.procname = "auto_msgmni",
|
|
.data = NULL,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_ipc_auto_msgmni,
|
|
.extra1 = SYSCTL_ZERO,
|
|
.extra2 = SYSCTL_ONE,
|
|
},
|
|
{
|
|
.procname = "msgmnb",
|
|
.data = &init_ipc_ns.msg_ctlmnb,
|
|
.maxlen = sizeof(init_ipc_ns.msg_ctlmnb),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = SYSCTL_ZERO,
|
|
.extra2 = SYSCTL_INT_MAX,
|
|
},
|
|
{
|
|
.procname = "sem",
|
|
.data = &init_ipc_ns.sem_ctls,
|
|
.maxlen = 4*sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_ipc_sem_dointvec,
|
|
},
|
|
#ifdef CONFIG_CHECKPOINT_RESTORE
|
|
{
|
|
.procname = "sem_next_id",
|
|
.data = &init_ipc_ns.ids[IPC_SEM_IDS].next_id,
|
|
.maxlen = sizeof(init_ipc_ns.ids[IPC_SEM_IDS].next_id),
|
|
.mode = 0444,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = SYSCTL_ZERO,
|
|
.extra2 = SYSCTL_INT_MAX,
|
|
},
|
|
{
|
|
.procname = "msg_next_id",
|
|
.data = &init_ipc_ns.ids[IPC_MSG_IDS].next_id,
|
|
.maxlen = sizeof(init_ipc_ns.ids[IPC_MSG_IDS].next_id),
|
|
.mode = 0444,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = SYSCTL_ZERO,
|
|
.extra2 = SYSCTL_INT_MAX,
|
|
},
|
|
{
|
|
.procname = "shm_next_id",
|
|
.data = &init_ipc_ns.ids[IPC_SHM_IDS].next_id,
|
|
.maxlen = sizeof(init_ipc_ns.ids[IPC_SHM_IDS].next_id),
|
|
.mode = 0444,
|
|
.proc_handler = proc_dointvec_minmax,
|
|
.extra1 = SYSCTL_ZERO,
|
|
.extra2 = SYSCTL_INT_MAX,
|
|
},
|
|
#endif
|
|
{}
|
|
};
|
|
|
|
static struct ctl_table_set *set_lookup(struct ctl_table_root *root)
|
|
{
|
|
return ¤t->nsproxy->ipc_ns->ipc_set;
|
|
}
|
|
|
|
static int set_is_seen(struct ctl_table_set *set)
|
|
{
|
|
return ¤t->nsproxy->ipc_ns->ipc_set == set;
|
|
}
|
|
|
|
static int ipc_permissions(struct ctl_table_header *head, struct ctl_table *table)
|
|
{
|
|
int mode = table->mode;
|
|
|
|
#ifdef CONFIG_CHECKPOINT_RESTORE
|
|
struct ipc_namespace *ns = current->nsproxy->ipc_ns;
|
|
|
|
if (((table->data == &ns->ids[IPC_SEM_IDS].next_id) ||
|
|
(table->data == &ns->ids[IPC_MSG_IDS].next_id) ||
|
|
(table->data == &ns->ids[IPC_SHM_IDS].next_id)) &&
|
|
checkpoint_restore_ns_capable(ns->user_ns))
|
|
mode = 0666;
|
|
#endif
|
|
return mode;
|
|
}
|
|
|
|
static struct ctl_table_root set_root = {
|
|
.lookup = set_lookup,
|
|
.permissions = ipc_permissions,
|
|
};
|
|
|
|
bool setup_ipc_sysctls(struct ipc_namespace *ns)
|
|
{
|
|
struct ctl_table *tbl;
|
|
|
|
setup_sysctl_set(&ns->ipc_set, &set_root, set_is_seen);
|
|
|
|
tbl = kmemdup(ipc_sysctls, sizeof(ipc_sysctls), GFP_KERNEL);
|
|
if (tbl) {
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(ipc_sysctls); i++) {
|
|
if (tbl[i].data == &init_ipc_ns.shm_ctlmax)
|
|
tbl[i].data = &ns->shm_ctlmax;
|
|
|
|
else if (tbl[i].data == &init_ipc_ns.shm_ctlall)
|
|
tbl[i].data = &ns->shm_ctlall;
|
|
|
|
else if (tbl[i].data == &init_ipc_ns.shm_ctlmni)
|
|
tbl[i].data = &ns->shm_ctlmni;
|
|
|
|
else if (tbl[i].data == &init_ipc_ns.shm_rmid_forced)
|
|
tbl[i].data = &ns->shm_rmid_forced;
|
|
|
|
else if (tbl[i].data == &init_ipc_ns.msg_ctlmax)
|
|
tbl[i].data = &ns->msg_ctlmax;
|
|
|
|
else if (tbl[i].data == &init_ipc_ns.msg_ctlmni)
|
|
tbl[i].data = &ns->msg_ctlmni;
|
|
|
|
else if (tbl[i].data == &init_ipc_ns.msg_ctlmnb)
|
|
tbl[i].data = &ns->msg_ctlmnb;
|
|
|
|
else if (tbl[i].data == &init_ipc_ns.sem_ctls)
|
|
tbl[i].data = &ns->sem_ctls;
|
|
#ifdef CONFIG_CHECKPOINT_RESTORE
|
|
else if (tbl[i].data == &init_ipc_ns.ids[IPC_SEM_IDS].next_id)
|
|
tbl[i].data = &ns->ids[IPC_SEM_IDS].next_id;
|
|
|
|
else if (tbl[i].data == &init_ipc_ns.ids[IPC_MSG_IDS].next_id)
|
|
tbl[i].data = &ns->ids[IPC_MSG_IDS].next_id;
|
|
|
|
else if (tbl[i].data == &init_ipc_ns.ids[IPC_SHM_IDS].next_id)
|
|
tbl[i].data = &ns->ids[IPC_SHM_IDS].next_id;
|
|
#endif
|
|
else
|
|
tbl[i].data = NULL;
|
|
}
|
|
|
|
ns->ipc_sysctls = __register_sysctl_table(&ns->ipc_set, "kernel", tbl);
|
|
}
|
|
if (!ns->ipc_sysctls) {
|
|
kfree(tbl);
|
|
retire_sysctl_set(&ns->ipc_set);
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
void retire_ipc_sysctls(struct ipc_namespace *ns)
|
|
{
|
|
struct ctl_table *tbl;
|
|
|
|
tbl = ns->ipc_sysctls->ctl_table_arg;
|
|
unregister_sysctl_table(ns->ipc_sysctls);
|
|
retire_sysctl_set(&ns->ipc_set);
|
|
kfree(tbl);
|
|
}
|
|
|
|
static int __init ipc_sysctl_init(void)
|
|
{
|
|
if (!setup_ipc_sysctls(&init_ipc_ns)) {
|
|
pr_warn("ipc sysctl registration failed\n");
|
|
return -ENOMEM;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
device_initcall(ipc_sysctl_init);
|
|
|
|
static int __init ipc_mni_extend(char *str)
|
|
{
|
|
ipc_mni = IPCMNI_EXTEND;
|
|
ipc_mni_shift = IPCMNI_EXTEND_SHIFT;
|
|
ipc_min_cycle = IPCMNI_EXTEND_MIN_CYCLE;
|
|
pr_info("IPCMNI extended to %d.\n", ipc_mni);
|
|
return 0;
|
|
}
|
|
early_param("ipcmni_extend", ipc_mni_extend);
|