mISDN: make sure device name is NUL terminated
diff mbox series

Message ID 20190522084513.GA2129@mwanda
State Accepted
Delegated to: David Miller
Headers show
Series
  • mISDN: make sure device name is NUL terminated
Related show

Commit Message

Dan Carpenter May 22, 2019, 8:45 a.m. UTC
The user can change the device_name with the IMSETDEVNAME ioctl, but we
need to ensure that the user's name is NUL terminated.  Otherwise it
could result in a buffer overflow when we copy the name back to the user
with IMGETDEVINFO ioctl.

I also changed two strcpy() calls which handle the name to strscpy().
Hopefully, there aren't any other ways to create a too long name, but
it's nice to do this as a kernel hardening measure.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
 drivers/isdn/mISDN/socket.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

Comments

David Miller May 23, 2019, 12:22 a.m. UTC | #1
From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Wed, 22 May 2019 11:45:13 +0300

> The user can change the device_name with the IMSETDEVNAME ioctl, but we
> need to ensure that the user's name is NUL terminated.  Otherwise it
> could result in a buffer overflow when we copy the name back to the user
> with IMGETDEVINFO ioctl.
> 
> I also changed two strcpy() calls which handle the name to strscpy().
> Hopefully, there aren't any other ways to create a too long name, but
> it's nice to do this as a kernel hardening measure.
> 
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>

Applied.

Patch
diff mbox series

diff --git a/drivers/isdn/mISDN/socket.c b/drivers/isdn/mISDN/socket.c
index a14e35d40538..84e1d4c2db66 100644
--- a/drivers/isdn/mISDN/socket.c
+++ b/drivers/isdn/mISDN/socket.c
@@ -393,7 +393,7 @@  data_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 			memcpy(di.channelmap, dev->channelmap,
 			       sizeof(di.channelmap));
 			di.nrbchan = dev->nrbchan;
-			strcpy(di.name, dev_name(&dev->dev));
+			strscpy(di.name, dev_name(&dev->dev), sizeof(di.name));
 			if (copy_to_user((void __user *)arg, &di, sizeof(di)))
 				err = -EFAULT;
 		} else
@@ -676,7 +676,7 @@  base_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 			memcpy(di.channelmap, dev->channelmap,
 			       sizeof(di.channelmap));
 			di.nrbchan = dev->nrbchan;
-			strcpy(di.name, dev_name(&dev->dev));
+			strscpy(di.name, dev_name(&dev->dev), sizeof(di.name));
 			if (copy_to_user((void __user *)arg, &di, sizeof(di)))
 				err = -EFAULT;
 		} else
@@ -690,6 +690,7 @@  base_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 			err = -EFAULT;
 			break;
 		}
+		dn.name[sizeof(dn.name) - 1] = '\0';
 		dev = get_mdevice(dn.id);
 		if (dev)
 			err = device_rename(&dev->dev, dn.name);