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compat_ioctl: cdrom: handle CDROM_LAST_WRITTEN 

This is the only ioctl command that does not have a proper
compat handler. Making the normal implementation do the
right thing is actually very simply, so just do that by
using an in_compat_syscall() check to avoid the special
case in the pkcdvd driver.

Reviewed-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Arnd Bergmann 2019-12-09 16:33:16 +01:00
parent 8f8f562038
commit ab8bc5417d
2 changed files with 5 additions and 26 deletions
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24
drivers/block/pktcdvd.c
View File

@ -2663,26 +2663,6 @@ static int pkt_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
return ret;
}
#ifdef CONFIG_COMPAT
static int pkt_compat_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg)
{
switch (cmd) {
/* compatible */
case CDROMEJECT:
case CDROMMULTISESSION:
case CDROMREADTOCENTRY:
case CDROM_SEND_PACKET: /* compat mode handled in scsi_cmd_ioctl */
case SCSI_IOCTL_SEND_COMMAND:
return pkt_ioctl(bdev, mode, cmd, (unsigned long)compat_ptr(arg));
/* FIXME: no handler so far */
default:
case CDROM_LAST_WRITTEN:
return -ENOIOCTLCMD;
}
}
#endif
static unsigned int pkt_check_events(struct gendisk *disk,
unsigned int clearing)
{
@ -2704,9 +2684,7 @@ static const struct block_device_operations pktcdvd_ops = {
.open = pkt_open,
.release = pkt_close,
.ioctl = pkt_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = pkt_compat_ioctl,
#endif
.compat_ioctl = blkdev_compat_ptr_ioctl,
.check_events = pkt_check_events,
};

7
drivers/cdrom/cdrom.c
View File

@ -3293,9 +3293,10 @@ static noinline int mmc_ioctl_cdrom_last_written(struct cdrom_device_info *cdi,
ret = cdrom_get_last_written(cdi, &last);
if (ret)
return ret;
if (copy_to_user((long __user *)arg, &last, sizeof(last)))
return -EFAULT;
return 0;
if (in_compat_syscall())
return put_user(last, (__s32 __user *)arg);
return put_user(last, (long __user *)arg);
}
static int mmc_ioctl(struct cdrom_device_info *cdi, unsigned int cmd,