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Message-Id: <1164603916594-git-send-email-ebiederm@xmission.com>
Date: Sun, 26 Nov 2006 22:05:11 -0700
From: "Eric W. Biederman" <ebiederm@...ssion.com>
To: Andrew Morton <akpm@...l.org>
Cc: <linux-kernel@...r.kernel.org>,
Linux Containers <containers@...ts.osdl.org>,
"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: [PATCH 4/4] sysctl: Fix sys_sysctl interface of ipc sysctls
Currently there is a regression and the ipc sysctls
don't show up in the binary sysctl namespace.
This patch adds sysctl_ipc_data to read data/write from the
appropriate namespace and deliver it in the expected manner.
Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
---
kernel/sysctl.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 50 insertions(+), 0 deletions(-)
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 638aa14..24c2ca8 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -142,6 +142,10 @@ static int sysctl_uts_string(ctl_table *
void __user *oldval, size_t __user *oldlenp,
void __user *newval, size_t newlen, void **context);
+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, void **context);
+
#ifdef CONFIG_PROC_SYSCTL
static int proc_do_cad_pid(ctl_table *table, int write, struct file *filp,
void __user *buffer, size_t *lenp, loff_t *ppos);
@@ -475,6 +479,7 @@ #ifdef CONFIG_SYSVIPC
.maxlen = sizeof (init_ipc_ns.shm_ctlmax),
.mode = 0644,
.proc_handler = &proc_ipc_doulongvec_minmax,
+ .strategy = sysctl_ipc_data,
},
{
.ctl_name = KERN_SHMALL,
@@ -483,6 +488,7 @@ #ifdef CONFIG_SYSVIPC
.maxlen = sizeof (init_ipc_ns.shm_ctlall),
.mode = 0644,
.proc_handler = &proc_ipc_doulongvec_minmax,
+ .strategy = sysctl_ipc_data,
},
{
.ctl_name = KERN_SHMMNI,
@@ -491,6 +497,7 @@ #ifdef CONFIG_SYSVIPC
.maxlen = sizeof (init_ipc_ns.shm_ctlmni),
.mode = 0644,
.proc_handler = &proc_ipc_dointvec,
+ .strategy = sysctl_ipc_data,
},
{
.ctl_name = KERN_MSGMAX,
@@ -499,6 +506,7 @@ #ifdef CONFIG_SYSVIPC
.maxlen = sizeof (init_ipc_ns.msg_ctlmax),
.mode = 0644,
.proc_handler = &proc_ipc_dointvec,
+ .strategy = sysctl_ipc_data,
},
{
.ctl_name = KERN_MSGMNI,
@@ -507,6 +515,7 @@ #ifdef CONFIG_SYSVIPC
.maxlen = sizeof (init_ipc_ns.msg_ctlmni),
.mode = 0644,
.proc_handler = &proc_ipc_dointvec,
+ .strategy = sysctl_ipc_data,
},
{
.ctl_name = KERN_MSGMNB,
@@ -515,6 +524,7 @@ #ifdef CONFIG_SYSVIPC
.maxlen = sizeof (init_ipc_ns.msg_ctlmnb),
.mode = 0644,
.proc_handler = &proc_ipc_dointvec,
+ .strategy = sysctl_ipc_data,
},
{
.ctl_name = KERN_SEM,
@@ -523,6 +533,7 @@ #ifdef CONFIG_SYSVIPC
.maxlen = 4*sizeof (int),
.mode = 0644,
.proc_handler = &proc_ipc_dointvec,
+ .strategy = sysctl_ipc_data,
},
#endif
#ifdef CONFIG_MAGIC_SYSRQ
@@ -2613,6 +2624,45 @@ static int sysctl_uts_string(ctl_table *
return r;
}
+/* 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, void **context)
+{
+ 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;
+}
+
#else /* CONFIG_SYSCTL_SYSCALL */
--
1.4.2.rc3.g7e18e-dirty
-
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