atm: 32-bit ioctl compatibility
We lack compat ioctl support through most of the ATM code. This patch
deals with most of it, and I can now at least use BR2684 and PPPoATM
with 32-bit userspace.
I haven't added a .compat_ioctl method to struct atm_ioctl, because
AFAICT none of the current users need any conversion -- so we can just
call the ->ioctl() method in every case. I looked at br2684, clip, lec,
mpc, pppoatm and atmtcp.
In svc_compat_ioctl() the only mangling which is needed is to change
COMPAT_ATM_ADDPARTY to ATM_ADDPARTY. Although it's defined as
_IOW('a', ATMIOC_SPECIAL+4,struct atm_iobuf)
it doesn't actually _take_ a struct atm_iobuf as an argument -- it takes
a struct sockaddr_atmsvc, which _is_ the same between 32-bit and 64-bit
code, so doesn't need conversion.
Almost all of vcc_ioctl() would have been identical, so I converted that
into a core do_vcc_ioctl() function with an 'int compat' argument.
I've done the same with atm_dev_ioctl(), where there _are_ a few
differences, but still it's relatively contained and there would
otherwise have been a lot of duplication.
I haven't done any of the actual device-specific ioctls, although I've
added a compat_ioctl method to struct atmdev_ops.
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/atm.h b/include/linux/atm.h
index c791ddd..d3b2921 100644
--- a/include/linux/atm.h
+++ b/include/linux/atm.h
@@ -231,10 +231,21 @@
*/
struct atmif_sioc {
- int number;
- int length;
- void __user *arg;
+ int number;
+ int length;
+ void __user *arg;
};
+#ifdef __KERNEL__
+#ifdef CONFIG_COMPAT
+#include <linux/compat.h>
+struct compat_atmif_sioc {
+ int number;
+ int length;
+ compat_uptr_t arg;
+};
+#endif
+#endif
+
typedef unsigned short atm_backend_t;
#endif
diff --git a/include/linux/atmdev.h b/include/linux/atmdev.h
index a3d07c2..086e5c3 100644
--- a/include/linux/atmdev.h
+++ b/include/linux/atmdev.h
@@ -100,6 +100,10 @@
/* use backend to make new if */
#define ATM_ADDPARTY _IOW('a', ATMIOC_SPECIAL+4,struct atm_iobuf)
/* add party to p2mp call */
+#ifdef CONFIG_COMPAT
+/* It actually takes struct sockaddr_atmsvc, not struct atm_iobuf */
+#define COMPAT_ATM_ADDPARTY _IOW('a', ATMIOC_SPECIAL+4,struct compat_atm_iobuf)
+#endif
#define ATM_DROPPARTY _IOW('a', ATMIOC_SPECIAL+5,int)
/* drop party from p2mp call */
@@ -224,6 +228,13 @@
extern struct proc_dir_entry *atm_proc_root;
#endif
+#ifdef CONFIG_COMPAT
+#include <linux/compat.h>
+struct compat_atm_iobuf {
+ int length;
+ compat_uptr_t buffer;
+};
+#endif
struct k_atm_aal_stats {
#define __HANDLE_ITEM(i) atomic_t i
@@ -379,6 +390,10 @@
int (*open)(struct atm_vcc *vcc);
void (*close)(struct atm_vcc *vcc);
int (*ioctl)(struct atm_dev *dev,unsigned int cmd,void __user *arg);
+#ifdef CONFIG_COMPAT
+ int (*compat_ioctl)(struct atm_dev *dev,unsigned int cmd,
+ void __user *arg);
+#endif
int (*getsockopt)(struct atm_vcc *vcc,int level,int optname,
void __user *optval,int optlen);
int (*setsockopt)(struct atm_vcc *vcc,int level,int optname,
diff --git a/net/atm/common.h b/net/atm/common.h
index 16f32c1..92e2981 100644
--- a/net/atm/common.h
+++ b/net/atm/common.h
@@ -19,6 +19,7 @@
size_t total_len);
unsigned int vcc_poll(struct file *file, struct socket *sock, poll_table *wait);
int vcc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
+int vcc_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
int vcc_setsockopt(struct socket *sock, int level, int optname,
char __user *optval, int optlen);
int vcc_getsockopt(struct socket *sock, int level, int optname,
diff --git a/net/atm/ioctl.c b/net/atm/ioctl.c
index 7afd8e7..76ed3c8 100644
--- a/net/atm/ioctl.c
+++ b/net/atm/ioctl.c
@@ -19,6 +19,7 @@
#include <linux/atmlec.h>
#include <linux/mutex.h>
#include <asm/ioctls.h>
+#include <net/compat.h>
#include "resources.h"
#include "signaling.h" /* for WAITING and sigd_attach */
@@ -46,7 +47,7 @@
EXPORT_SYMBOL(register_atm_ioctl);
EXPORT_SYMBOL(deregister_atm_ioctl);
-int vcc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
+static int do_vcc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg, int compat)
{
struct sock *sk = sock->sk;
struct atm_vcc *vcc;
@@ -80,13 +81,25 @@
goto done;
}
case SIOCGSTAMP: /* borrowed from IP */
- error = sock_get_timestamp(sk, argp);
+#ifdef CONFIG_COMPAT
+ if (compat)
+ error = compat_sock_get_timestamp(sk, argp);
+ else
+#endif
+ error = sock_get_timestamp(sk, argp);
goto done;
case SIOCGSTAMPNS: /* borrowed from IP */
- error = sock_get_timestampns(sk, argp);
+#ifdef CONFIG_COMPAT
+ if (compat)
+ error = compat_sock_get_timestampns(sk, argp);
+ else
+#endif
+ error = sock_get_timestampns(sk, argp);
goto done;
case ATM_SETSC:
- printk(KERN_WARNING "ATM_SETSC is obsolete\n");
+ if (net_ratelimit())
+ printk(KERN_WARNING "ATM_SETSC is obsolete; used by %s:%d\n",
+ current->comm, task_pid_nr(current));
error = 0;
goto done;
case ATMSIGD_CTRL:
@@ -99,12 +112,23 @@
* info uses kernel pointers as opaque references,
* so the holder of the file descriptor can scribble
* on the kernel... so we should make sure that we
- * have the same privledges that /proc/kcore needs
+ * have the same privileges that /proc/kcore needs
*/
if (!capable(CAP_SYS_RAWIO)) {
error = -EPERM;
goto done;
}
+#ifdef CONFIG_COMPAT
+ /* WTF? I don't even want to _think_ about making this
+ work for 32-bit userspace. TBH I don't really want
+ to think about it at all. dwmw2. */
+ if (compat) {
+ if (net_ratelimit())
+ printk(KERN_WARNING "32-bit task cannot be atmsigd\n");
+ error = -EINVAL;
+ goto done;
+ }
+#endif
error = sigd_attach(vcc);
if (!error)
sock->state = SS_CONNECTED;
@@ -155,8 +179,21 @@
if (error != -ENOIOCTLCMD)
goto done;
- error = atm_dev_ioctl(cmd, argp);
+ error = atm_dev_ioctl(cmd, argp, compat);
done:
return error;
}
+
+
+int vcc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
+{
+ return do_vcc_ioctl(sock, cmd, arg, 0);
+}
+
+#ifdef CONFIG_COMPAT
+int vcc_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
+{
+ return do_vcc_ioctl(sock, cmd, arg, 1);
+}
+#endif
diff --git a/net/atm/pvc.c b/net/atm/pvc.c
index 43e8bf5..e1d22d9 100644
--- a/net/atm/pvc.c
+++ b/net/atm/pvc.c
@@ -113,6 +113,9 @@
.getname = pvc_getname,
.poll = vcc_poll,
.ioctl = vcc_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = vcc_compat_ioctl,
+#endif
.listen = sock_no_listen,
.shutdown = pvc_shutdown,
.setsockopt = pvc_setsockopt,
diff --git a/net/atm/resources.c b/net/atm/resources.c
index a34ba94..56b7322 100644
--- a/net/atm/resources.c
+++ b/net/atm/resources.c
@@ -195,20 +195,39 @@
}
-int atm_dev_ioctl(unsigned int cmd, void __user *arg)
+int atm_dev_ioctl(unsigned int cmd, void __user *arg, int compat)
{
void __user *buf;
int error, len, number, size = 0;
struct atm_dev *dev;
struct list_head *p;
int *tmp_buf, *tmp_p;
- struct atm_iobuf __user *iobuf = arg;
- struct atmif_sioc __user *sioc = arg;
+ int __user *sioc_len;
+ int __user *iobuf_len;
+
+#ifndef CONFIG_COMPAT
+ compat = 0; /* Just so the compiler _knows_ */
+#endif
+
switch (cmd) {
case ATM_GETNAMES:
- if (get_user(buf, &iobuf->buffer))
- return -EFAULT;
- if (get_user(len, &iobuf->length))
+
+ if (compat) {
+#ifdef CONFIG_COMPAT
+ struct compat_atm_iobuf __user *ciobuf = arg;
+ compat_uptr_t cbuf;
+ iobuf_len = &ciobuf->length;
+ if (get_user(cbuf, &ciobuf->buffer))
+ return -EFAULT;
+ buf = compat_ptr(cbuf);
+#endif
+ } else {
+ struct atm_iobuf __user *iobuf = arg;
+ iobuf_len = &iobuf->length;
+ if (get_user(buf, &iobuf->buffer))
+ return -EFAULT;
+ }
+ if (get_user(len, iobuf_len))
return -EFAULT;
mutex_lock(&atm_dev_mutex);
list_for_each(p, &atm_devs)
@@ -229,7 +248,7 @@
}
mutex_unlock(&atm_dev_mutex);
error = ((copy_to_user(buf, tmp_buf, size)) ||
- put_user(size, &iobuf->length))
+ put_user(size, iobuf_len))
? -EFAULT : 0;
kfree(tmp_buf);
return error;
@@ -237,13 +256,32 @@
break;
}
- if (get_user(buf, &sioc->arg))
- return -EFAULT;
- if (get_user(len, &sioc->length))
- return -EFAULT;
- if (get_user(number, &sioc->number))
- return -EFAULT;
+ if (compat) {
+#ifdef CONFIG_COMPAT
+ struct compat_atmif_sioc __user *csioc = arg;
+ compat_uptr_t carg;
+ sioc_len = &csioc->length;
+ if (get_user(carg, &csioc->arg))
+ return -EFAULT;
+ buf = compat_ptr(carg);
+
+ if (get_user(len, &csioc->length))
+ return -EFAULT;
+ if (get_user(number, &csioc->number))
+ return -EFAULT;
+#endif
+ } else {
+ struct atmif_sioc __user *sioc = arg;
+
+ sioc_len = &sioc->length;
+ if (get_user(buf, &sioc->arg))
+ return -EFAULT;
+ if (get_user(len, &sioc->length))
+ return -EFAULT;
+ if (get_user(number, &sioc->number))
+ return -EFAULT;
+ }
if (!(dev = try_then_request_module(atm_dev_lookup(number),
"atm-device-%d", number)))
return -ENODEV;
@@ -358,7 +396,7 @@
size = error;
/* may return 0, but later on size == 0 means "don't
write the length" */
- error = put_user(size, &sioc->length)
+ error = put_user(size, sioc_len)
? -EFAULT : 0;
goto done;
case ATM_SETLOOP:
@@ -380,11 +418,21 @@
}
/* fall through */
default:
- if (!dev->ops->ioctl) {
- error = -EINVAL;
- goto done;
+ if (compat) {
+#ifdef CONFIG_COMPAT
+ if (!dev->ops->compat_ioctl) {
+ error = -EINVAL;
+ goto done;
+ }
+ size = dev->ops->compat_ioctl(dev, cmd, buf);
+#endif
+ } else {
+ if (!dev->ops->ioctl) {
+ error = -EINVAL;
+ goto done;
+ }
+ size = dev->ops->ioctl(dev, cmd, buf);
}
- size = dev->ops->ioctl(dev, cmd, buf);
if (size < 0) {
error = (size == -ENOIOCTLCMD ? -EINVAL : size);
goto done;
@@ -392,7 +440,7 @@
}
if (size)
- error = put_user(size, &sioc->length)
+ error = put_user(size, sioc_len)
? -EFAULT : 0;
else
error = 0;
diff --git a/net/atm/resources.h b/net/atm/resources.h
index 1d004aa..126fb18 100644
--- a/net/atm/resources.h
+++ b/net/atm/resources.h
@@ -13,7 +13,7 @@
extern struct list_head atm_devs;
extern struct mutex atm_dev_mutex;
-int atm_dev_ioctl(unsigned int cmd, void __user *arg);
+int atm_dev_ioctl(unsigned int cmd, void __user *arg, int compat);
#ifdef CONFIG_PROC_FS
diff --git a/net/atm/svc.c b/net/atm/svc.c
index de1e4f2..e9c6550 100644
--- a/net/atm/svc.c
+++ b/net/atm/svc.c
@@ -604,6 +604,22 @@
return error;
}
+#ifdef CONFIG_COMPAT
+static int svc_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
+{
+ /* The definition of ATM_ADDPARTY uses the size of struct atm_iobuf.
+ But actually it takes a struct sockaddr_atmsvc, which doesn't need
+ compat handling. So all we have to do is fix up cmd... */
+ if (cmd == COMPAT_ATM_ADDPARTY)
+ cmd = ATM_ADDPARTY;
+
+ if (cmd == ATM_ADDPARTY || cmd == ATM_DROPPARTY)
+ return svc_ioctl(sock, cmd, arg);
+ else
+ return vcc_compat_ioctl(sock, cmd, arg);
+}
+#endif /* CONFIG_COMPAT */
+
static const struct proto_ops svc_proto_ops = {
.family = PF_ATMSVC,
.owner = THIS_MODULE,
@@ -616,6 +632,9 @@
.getname = svc_getname,
.poll = vcc_poll,
.ioctl = svc_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = svc_compat_ioctl,
+#endif
.listen = svc_listen,
.shutdown = svc_shutdown,
.setsockopt = svc_setsockopt,
