[PATCH] sysctl: move SYSV IPC sysctls to their own file
This is just a simple cleanup to keep kernel/sysctl.c from getting to crowded
with special cases, and by keeping all of the ipc logic to together it makes
the code a little more readable.
[gcoady.lk@gmail.com: build fix]
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Cc: Serge E. Hallyn <serue@us.ibm.com>
Cc: Herbert Poetzl <herbert@13thfloor.at>
Cc: Kirill Korotaev <dev@sw.ru>
Signed-off-by: Grant Coady <gcoady.lk@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/init/Kconfig b/init/Kconfig
index ad33c97..f977086 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -125,6 +125,12 @@
environments, to use ipc namespaces to provide different ipc
objects for different servers. If unsure, say N.
+config SYSVIPC_SYSCTL
+ bool
+ depends on SYSVIPC
+ depends on SYSCTL
+ default y
+
config POSIX_MQUEUE
bool "POSIX Message Queues"
depends on NET && EXPERIMENTAL
diff --git a/ipc/Makefile b/ipc/Makefile
index 0a6d626..b93bba6 100644
--- a/ipc/Makefile
+++ b/ipc/Makefile
@@ -4,6 +4,7 @@
obj-$(CONFIG_SYSVIPC_COMPAT) += compat.o
obj-$(CONFIG_SYSVIPC) += util.o msgutil.o msg.o sem.o shm.o
+obj-$(CONFIG_SYSVIPC_SYSCTL) += ipc_sysctl.o
obj_mq-$(CONFIG_COMPAT) += compat_mq.o
obj-$(CONFIG_POSIX_MQUEUE) += mqueue.o msgutil.o $(obj_mq-y)
diff --git a/ipc/ipc_sysctl.c b/ipc/ipc_sysctl.c
new file mode 100644
index 0000000..2c17d83
--- /dev/null
+++ b/ipc/ipc_sysctl.c
@@ -0,0 +1,183 @@
+/*
+ * Copyright (C) 2007
+ *
+ * Author: Eric Biederman <ebiederm@xmision.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/module.h>
+#include <linux/ipc.h>
+#include <linux/nsproxy.h>
+#include <linux/sysctl.h>
+#include <linux/uaccess.h>
+
+#ifdef CONFIG_IPC_NS
+static void *get_ipc(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;
+}
+#else
+#define get_ipc(T) ((T)->data)
+#endif
+
+#ifdef CONFIG_PROC_FS
+static int proc_ipc_dointvec(ctl_table *table, int write, struct file *filp,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ struct ctl_table ipc_table;
+ memcpy(&ipc_table, table, sizeof(ipc_table));
+ ipc_table.data = get_ipc(table);
+
+ return proc_dointvec(&ipc_table, write, filp, buffer, lenp, ppos);
+}
+
+static int proc_ipc_doulongvec_minmax(ctl_table *table, int write,
+ struct file *filp, void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ struct ctl_table ipc_table;
+ memcpy(&ipc_table, table, sizeof(ipc_table));
+ ipc_table.data = get_ipc(table);
+
+ return proc_doulongvec_minmax(&ipc_table, write, filp, buffer,
+ lenp, ppos);
+}
+
+#else
+#define proc_ipc_doulongvec_minmax NULL
+#define proc_ipc_dointvec NULL
+#endif
+
+#ifdef CONFIG_SYSCTL_SYSCALL
+/* The generic sysctl ipc data routine. */
+static int sysctl_ipc_data(ctl_table *table, int __user *name, int nlen,
+ void __user *oldval, size_t __user *oldlenp,
+ void __user *newval, size_t newlen)
+{
+ size_t len;
+ void *data;
+
+ /* Get out of I don't have a variable */
+ if (!table->data || !table->maxlen)
+ return -ENOTDIR;
+
+ data = get_ipc(table);
+ if (!data)
+ return -ENOTDIR;
+
+ if (oldval && oldlenp) {
+ if (get_user(len, oldlenp))
+ return -EFAULT;
+ if (len) {
+ if (len > table->maxlen)
+ len = table->maxlen;
+ if (copy_to_user(oldval, data, len))
+ return -EFAULT;
+ if (put_user(len, oldlenp))
+ return -EFAULT;
+ }
+ }
+
+ if (newval && newlen) {
+ if (newlen > table->maxlen)
+ newlen = table->maxlen;
+
+ if (copy_from_user(data, newval, newlen))
+ return -EFAULT;
+ }
+ return 1;
+}
+#else
+#define sysctl_ipc_data NULL
+#endif
+
+static struct ctl_table ipc_kern_table[] = {
+ {
+ .ctl_name = KERN_SHMMAX,
+ .procname = "shmmax",
+ .data = &init_ipc_ns.shm_ctlmax,
+ .maxlen = sizeof (init_ipc_ns.shm_ctlmax),
+ .mode = 0644,
+ .proc_handler = proc_ipc_doulongvec_minmax,
+ .strategy = sysctl_ipc_data,
+ },
+ {
+ .ctl_name = KERN_SHMALL,
+ .procname = "shmall",
+ .data = &init_ipc_ns.shm_ctlall,
+ .maxlen = sizeof (init_ipc_ns.shm_ctlall),
+ .mode = 0644,
+ .proc_handler = proc_ipc_doulongvec_minmax,
+ .strategy = sysctl_ipc_data,
+ },
+ {
+ .ctl_name = KERN_SHMMNI,
+ .procname = "shmmni",
+ .data = &init_ipc_ns.shm_ctlmni,
+ .maxlen = sizeof (init_ipc_ns.shm_ctlmni),
+ .mode = 0644,
+ .proc_handler = proc_ipc_dointvec,
+ .strategy = sysctl_ipc_data,
+ },
+ {
+ .ctl_name = KERN_MSGMAX,
+ .procname = "msgmax",
+ .data = &init_ipc_ns.msg_ctlmax,
+ .maxlen = sizeof (init_ipc_ns.msg_ctlmax),
+ .mode = 0644,
+ .proc_handler = proc_ipc_dointvec,
+ .strategy = sysctl_ipc_data,
+ },
+ {
+ .ctl_name = KERN_MSGMNI,
+ .procname = "msgmni",
+ .data = &init_ipc_ns.msg_ctlmni,
+ .maxlen = sizeof (init_ipc_ns.msg_ctlmni),
+ .mode = 0644,
+ .proc_handler = proc_ipc_dointvec,
+ .strategy = sysctl_ipc_data,
+ },
+ {
+ .ctl_name = KERN_MSGMNB,
+ .procname = "msgmnb",
+ .data = &init_ipc_ns.msg_ctlmnb,
+ .maxlen = sizeof (init_ipc_ns.msg_ctlmnb),
+ .mode = 0644,
+ .proc_handler = proc_ipc_dointvec,
+ .strategy = sysctl_ipc_data,
+ },
+ {
+ .ctl_name = KERN_SEM,
+ .procname = "sem",
+ .data = &init_ipc_ns.sem_ctls,
+ .maxlen = 4*sizeof (int),
+ .mode = 0644,
+ .proc_handler = proc_ipc_dointvec,
+ .strategy = sysctl_ipc_data,
+ },
+ {}
+};
+
+static struct ctl_table ipc_root_table[] = {
+ {
+ .ctl_name = CTL_KERN,
+ .procname = "kernel",
+ .mode = 0555,
+ .child = ipc_kern_table,
+ },
+ {}
+};
+
+static int __init ipc_sysctl_init(void)
+{
+ register_sysctl_table(ipc_root_table, 0);
+ return 0;
+}
+
+__initcall(ipc_sysctl_init);
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index eff1d36..ca376e73 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -90,12 +90,6 @@
#ifdef CONFIG_CHR_DEV_SG
extern int sg_big_buff;
#endif
-#ifdef CONFIG_SYSVIPC
-static int proc_ipc_dointvec(ctl_table *table, int write, struct file *filp,
- void __user *buffer, size_t *lenp, loff_t *ppos);
-static int proc_ipc_doulongvec_minmax(ctl_table *table, int write, struct file *filp,
- void __user *buffer, size_t *lenp, loff_t *ppos);
-#endif
#ifdef __sparc__
extern char reboot_command [];
@@ -135,11 +129,6 @@
void __user *, size_t, ctl_table *);
#endif
-#ifdef CONFIG_SYSVIPC
-static int sysctl_ipc_data(ctl_table *table, int __user *name, int nlen,
- void __user *oldval, size_t __user *oldlenp,
- void __user *newval, size_t newlen);
-#endif
#ifdef CONFIG_PROC_SYSCTL
static int proc_do_cad_pid(ctl_table *table, int write, struct file *filp,
@@ -169,17 +158,6 @@
int sysctl_legacy_va_layout;
#endif
-#ifdef CONFIG_SYSVIPC
-static void *get_ipc(ctl_table *table, int write)
-{
- char *which = table->data;
- struct ipc_namespace *ipc_ns = current->nsproxy->ipc_ns;
- which = (which - (char *)&init_ipc_ns) + (char *)ipc_ns;
- return which;
-}
-#else
-#define get_ipc(T,W) ((T)->data)
-#endif
/* /proc declarations: */
@@ -403,71 +381,6 @@
.proc_handler = &proc_dointvec,
},
#endif
-#ifdef CONFIG_SYSVIPC
- {
- .ctl_name = KERN_SHMMAX,
- .procname = "shmmax",
- .data = &init_ipc_ns.shm_ctlmax,
- .maxlen = sizeof (init_ipc_ns.shm_ctlmax),
- .mode = 0644,
- .proc_handler = &proc_ipc_doulongvec_minmax,
- .strategy = sysctl_ipc_data,
- },
- {
- .ctl_name = KERN_SHMALL,
- .procname = "shmall",
- .data = &init_ipc_ns.shm_ctlall,
- .maxlen = sizeof (init_ipc_ns.shm_ctlall),
- .mode = 0644,
- .proc_handler = &proc_ipc_doulongvec_minmax,
- .strategy = sysctl_ipc_data,
- },
- {
- .ctl_name = KERN_SHMMNI,
- .procname = "shmmni",
- .data = &init_ipc_ns.shm_ctlmni,
- .maxlen = sizeof (init_ipc_ns.shm_ctlmni),
- .mode = 0644,
- .proc_handler = &proc_ipc_dointvec,
- .strategy = sysctl_ipc_data,
- },
- {
- .ctl_name = KERN_MSGMAX,
- .procname = "msgmax",
- .data = &init_ipc_ns.msg_ctlmax,
- .maxlen = sizeof (init_ipc_ns.msg_ctlmax),
- .mode = 0644,
- .proc_handler = &proc_ipc_dointvec,
- .strategy = sysctl_ipc_data,
- },
- {
- .ctl_name = KERN_MSGMNI,
- .procname = "msgmni",
- .data = &init_ipc_ns.msg_ctlmni,
- .maxlen = sizeof (init_ipc_ns.msg_ctlmni),
- .mode = 0644,
- .proc_handler = &proc_ipc_dointvec,
- .strategy = sysctl_ipc_data,
- },
- {
- .ctl_name = KERN_MSGMNB,
- .procname = "msgmnb",
- .data = &init_ipc_ns.msg_ctlmnb,
- .maxlen = sizeof (init_ipc_ns.msg_ctlmnb),
- .mode = 0644,
- .proc_handler = &proc_ipc_dointvec,
- .strategy = sysctl_ipc_data,
- },
- {
- .ctl_name = KERN_SEM,
- .procname = "sem",
- .data = &init_ipc_ns.sem_ctls,
- .maxlen = 4*sizeof (int),
- .mode = 0644,
- .proc_handler = &proc_ipc_dointvec,
- .strategy = sysctl_ipc_data,
- },
-#endif
#ifdef CONFIG_MAGIC_SYSRQ
{
.ctl_name = KERN_SYSRQ,
@@ -2269,27 +2182,6 @@
do_proc_dointvec_ms_jiffies_conv, NULL);
}
-#ifdef CONFIG_SYSVIPC
-static int proc_ipc_dointvec(ctl_table *table, int write, struct file *filp,
- void __user *buffer, size_t *lenp, loff_t *ppos)
-{
- void *which;
- which = get_ipc(table, write);
- return __do_proc_dointvec(which, table, write, filp, buffer,
- lenp, ppos, NULL, NULL);
-}
-
-static int proc_ipc_doulongvec_minmax(ctl_table *table, int write,
- struct file *filp, void __user *buffer, size_t *lenp, loff_t *ppos)
-{
- void *which;
- which = get_ipc(table, write);
- return __do_proc_doulongvec_minmax(which, table, write, filp, buffer,
- lenp, ppos, 1l, 1l);
-}
-
-#endif
-
static int proc_do_cad_pid(ctl_table *table, int write, struct file *filp,
void __user *buffer, size_t *lenp, loff_t *ppos)
{
@@ -2320,25 +2212,6 @@
return -ENOSYS;
}
-#ifdef CONFIG_SYSVIPC
-static int proc_do_ipc_string(ctl_table *table, int write, struct file *filp,
- void __user *buffer, size_t *lenp, loff_t *ppos)
-{
- return -ENOSYS;
-}
-static int proc_ipc_dointvec(ctl_table *table, int write, struct file *filp,
- void __user *buffer, size_t *lenp, loff_t *ppos)
-{
- return -ENOSYS;
-}
-static int proc_ipc_doulongvec_minmax(ctl_table *table, int write,
- struct file *filp, void __user *buffer,
- size_t *lenp, loff_t *ppos)
-{
- return -ENOSYS;
-}
-#endif
-
int proc_dointvec(ctl_table *table, int write, struct file *filp,
void __user *buffer, size_t *lenp, loff_t *ppos)
{
@@ -2550,47 +2423,6 @@
-#ifdef CONFIG_SYSVIPC
-/* The generic sysctl ipc data routine. */
-static int sysctl_ipc_data(ctl_table *table, int __user *name, int nlen,
- void __user *oldval, size_t __user *oldlenp,
- void __user *newval, size_t newlen)
-{
- size_t len;
- void *data;
-
- /* Get out of I don't have a variable */
- if (!table->data || !table->maxlen)
- return -ENOTDIR;
-
- data = get_ipc(table, 1);
- if (!data)
- return -ENOTDIR;
-
- if (oldval && oldlenp) {
- if (get_user(len, oldlenp))
- return -EFAULT;
- if (len) {
- if (len > table->maxlen)
- len = table->maxlen;
- if (copy_to_user(oldval, data, len))
- return -EFAULT;
- if (put_user(len, oldlenp))
- return -EFAULT;
- }
- }
-
- if (newval && newlen) {
- if (newlen > table->maxlen)
- newlen = table->maxlen;
-
- if (copy_from_user(data, newval, newlen))
- return -EFAULT;
- }
- return 1;
-}
-#endif
-
#else /* CONFIG_SYSCTL_SYSCALL */
@@ -2655,14 +2487,6 @@
return -ENOSYS;
}
-#ifdef CONFIG_SYSVIPC
-static int sysctl_ipc_data(ctl_table *table, int __user *name, int nlen,
- void __user *oldval, size_t __user *oldlenp,
- void __user *newval, size_t newlen)
-{
- return -ENOSYS;
-}
-#endif
#endif /* CONFIG_SYSCTL_SYSCALL */
/*
