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[PATCH] Fix root hole in pktcdvd

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ioctl_by_bdev may only be used INSIDE the kernel.  If the "arg" argument
refers to memory that is accessed by put_user/get_user in the ioctl
function, the memory needs to be in the kernel address space (that's the
set_fs(KERNEL_DS) doing in the ioctl_by_bdev).  This works on i386 because
even with set_fs(KERNEL_DS) the user space memory is still accessible with
put_user/get_user.  That is not true for s390.  In short the ioctl
implementation of the pktcdvd device driver is horribly broken.

Signed-off-by: Peter Osterlund <petero2@telia.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Peter Osterlund 2005-05-14 00:58:30 -07:00 committed by Greg KH
parent 739b21c70f
commit 6d608f690e
1 changed files with 2 additions and 2 deletions
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4
drivers/block/pktcdvd.c
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@ -2400,7 +2400,7 @@ static int pkt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, u
case CDROM_LAST_WRITTEN:
case CDROM_SEND_PACKET:
case SCSI_IOCTL_SEND_COMMAND:
return ioctl_by_bdev(pd->bdev, cmd, arg);
return blkdev_ioctl(pd->bdev->bd_inode, file, cmd, arg);
case CDROMEJECT:
/*
@ -2408,7 +2408,7 @@ static int pkt_ioctl(struct inode *inode, struct file *file, unsigned int cmd, u
* have to unlock it or else the eject command fails.
*/
pkt_lock_door(pd, 0);
return ioctl_by_bdev(pd->bdev, cmd, arg);
return blkdev_ioctl(pd->bdev->bd_inode, file, cmd, arg);
default:
printk("pktcdvd: Unknown ioctl for %s (%x)\n", pd->name, cmd);