@@ -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);
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(-)