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| author | Peter Osterlund <petero2@telia.com> | 2005-05-14 00:58:30 -0700 |
|---|---|---|
| committer | Greg KH <gregkh@suse.de> | 2005-05-16 21:07:31 -0700 |
| commit | 118326e940bdecef6c459d42ccf05256ba86daa7 (patch) | |
| tree | 13b1e48f4f3700603ed258c41e9e39978babf5ee /drivers/block/pktcdvd.c | |
| parent | 68f66feb300423bb9ee5daecb1951af394425a38 (diff) | |
| download | lwn-118326e940bdecef6c459d42ccf05256ba86daa7.tar.gz lwn-118326e940bdecef6c459d42ccf05256ba86daa7.zip | |
[PATCH] Fix root hole in pktcdvd
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>
Diffstat (limited to 'drivers/block/pktcdvd.c')
| -rw-r--r-- | drivers/block/pktcdvd.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c index 1a1fa3ccb913..82ccad0a7f1a 100644 --- a/drivers/block/pktcdvd.c +++ b/drivers/block/pktcdvd.c @@ -2406,7 +2406,7 @@ 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: /* @@ -2414,7 +2414,7 @@ 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); |