[PATCH] 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.

[akpm@osdl.org: warning fix]
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 60 insertions, 0 deletions

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 10474a63a111..025fcb3c66f8 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -143,6 +143,12 @@ static int sysctl_uts_string(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_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, void **context);
+#endif
+
 #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);
@@ -476,6 +482,7 @@ static ctl_table kern_table[] = {
                 .maxlen         = sizeof (init_ipc_ns.shm_ctlmax),
                 .mode           = 0644,
                 .proc_handler   = &proc_ipc_doulongvec_minmax,
+                .strategy       = sysctl_ipc_data,
         },
         {
                 .ctl_name       = KERN_SHMALL,
@@ -484,6 +491,7 @@ static ctl_table kern_table[] = {
                 .maxlen         = sizeof (init_ipc_ns.shm_ctlall),
                 .mode           = 0644,
                 .proc_handler   = &proc_ipc_doulongvec_minmax,
+                .strategy       = sysctl_ipc_data,
         },
         {
                 .ctl_name       = KERN_SHMMNI,
@@ -492,6 +500,7 @@ static ctl_table kern_table[] = {
                 .maxlen         = sizeof (init_ipc_ns.shm_ctlmni),
                 .mode           = 0644,
                 .proc_handler   = &proc_ipc_dointvec,
+                .strategy       = sysctl_ipc_data,
         },
         {
                 .ctl_name       = KERN_MSGMAX,
@@ -500,6 +509,7 @@ static ctl_table kern_table[] = {
                 .maxlen         = sizeof (init_ipc_ns.msg_ctlmax),
                 .mode           = 0644,
                 .proc_handler   = &proc_ipc_dointvec,
+                .strategy       = sysctl_ipc_data,
         },
         {
                 .ctl_name       = KERN_MSGMNI,
@@ -508,6 +518,7 @@ static ctl_table kern_table[] = {
                 .maxlen         = sizeof (init_ipc_ns.msg_ctlmni),
                 .mode           = 0644,
                 .proc_handler   = &proc_ipc_dointvec,
+                .strategy       = sysctl_ipc_data,
         },
         {
                 .ctl_name       = KERN_MSGMNB,
@@ -516,6 +527,7 @@ static ctl_table kern_table[] = {
                 .maxlen         = sizeof (init_ipc_ns.msg_ctlmnb),
                 .mode           = 0644,
                 .proc_handler   = &proc_ipc_dointvec,
+                .strategy       = sysctl_ipc_data,
         },
         {
                 .ctl_name       = KERN_SEM,
@@ -524,6 +536,7 @@ static ctl_table kern_table[] = {
                 .maxlen         = 4*sizeof (int),
                 .mode           = 0644,
                 .proc_handler   = &proc_ipc_dointvec,
+                .strategy       = sysctl_ipc_data,
         },
 #endif
 #ifdef CONFIG_MAGIC_SYSRQ
@@ -2611,6 +2624,47 @@ static int sysctl_uts_string(ctl_table *table, int __user *name, int nlen,
         return r;
 }
 
+#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, 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;
+}
+#endif
+
 #else /* CONFIG_SYSCTL_SYSCALL */
 
 
@@ -2681,6 +2735,12 @@ static int sysctl_uts_string(ctl_table *table, int __user *name, int nlen,
 {
         return -ENOSYS;
 }
+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)
+{
+        return -ENOSYS;
+}
 #endif /* CONFIG_SYSCTL_SYSCALL */
 
 /*