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[PATCH] sysctl: fix sys_sysctl interface of ipc sysctls

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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>
This commit is contained in:
Eric W. Biederman 2006-12-08 02:39:57 -08:00 committed by Linus Torvalds
parent 9bc9a6bd3c
commit 6b49a25785
1 changed files with 60 additions and 0 deletions
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60
kernel/sysctl.c
View file

@ -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 */
/*