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Date: Fri, 4 Jan 2008 15:38:58 +0800
From: Dave Young <hidave.darkstar@...il.com>
To: jens.axboe@...cle.com
Cc: amir@...m.org.il, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][BUG 3879] add some check before scsi_cmd_ioctl
On Fri, Jan 04, 2008 at 03:28:26PM +0800, Dave Young wrote:
> The behaviour of eject/lock_door ioctl is not consistent, so add some check before scsi_cmd_ioctl.
>
> Signed-off-by: Dave Young <hidave.darkstar@...il.com>
>
> ---
> drivers/cdrom/cdrom.c | 42 ++++++++++++++++++++++++++++++++++++------
> 1 file changed, 36 insertions(+), 6 deletions(-)
>
Sorry, should be this one:
The behaviour of eject/lock_door ioctl is not consistent, so add some check before scsi_cmd_ioctl.
Signed-off-by: Dave Young <hidave.darkstar@...il.com>
---
drivers/cdrom/cdrom.c | 47 ++++++++++++++++++++++++++++++++++++++---------
1 file changed, 38 insertions(+), 9 deletions(-)
diff -upr linux/drivers/cdrom/cdrom.c linux.new/drivers/cdrom/cdrom.c
--- linux/drivers/cdrom/cdrom.c 2008-01-04 15:32:09.000000000 +0800
+++ linux.new/drivers/cdrom/cdrom.c 2008-01-04 15:34:00.000000000 +0800
@@ -2236,14 +2236,22 @@ static int cdrom_ioctl_multisession(stru
return 0;
}
-static int cdrom_ioctl_eject(struct cdrom_device_info *cdi)
+static int cdrom_eject_check(struct cdrom_device_info *cdi)
{
- cdinfo(CD_DO_IOCTL, "entering CDROMEJECT\n");
-
if (!CDROM_CAN(CDC_OPEN_TRAY))
return -ENOSYS;
if (cdi->use_count != 1 || keeplocked)
return -EBUSY;
+ return 0;
+}
+
+static int cdrom_ioctl_eject(struct cdrom_device_info *cdi)
+{
+ cdinfo(CD_DO_IOCTL, "entering CDROMEJECT\n");
+
+ /*
+ * cdrom_eject_check is done in cdrom_ioctl.
+ */
if (CDROM_CAN(CDC_LOCK)) {
int ret = cdi->ops->lock_door(cdi, 0);
if (ret)
@@ -2392,22 +2400,31 @@ static int cdrom_ioctl_reset(struct cdro
return cdi->ops->reset(cdi);
}
-static int cdrom_ioctl_lock_door(struct cdrom_device_info *cdi,
+static int cdrom_lock_door_check(struct cdrom_device_info *cdi,
unsigned long arg)
{
- cdinfo(CD_DO_IOCTL, "%socking door.\n", arg ? "L" : "Unl");
-
if (!CDROM_CAN(CDC_LOCK))
return -EDRIVE_CANT_DO_THIS;
-
- keeplocked = arg ? 1 : 0;
-
/*
* Don't unlock the door on multiple opens by default, but allow
* root to do so.
*/
if (cdi->use_count != 1 && !arg && !capable(CAP_SYS_ADMIN))
return -EBUSY;
+
+ return 0;
+}
+
+
+static int cdrom_ioctl_lock_door(struct cdrom_device_info *cdi,
+ unsigned long arg)
+{
+ cdinfo(CD_DO_IOCTL, "%socking door.\n", arg ? "L" : "Unl");
+
+ /*
+ * cdrom_lock_door_check is done in cdrom_ioctl.
+ */
+ keeplocked = arg ? 1 : 0;
return cdi->ops->lock_door(cdi, arg);
}
@@ -2701,6 +2718,18 @@ int cdrom_ioctl(struct file * file, stru
int ret;
struct gendisk *disk = ip->i_bdev->bd_disk;
+ if (cmd == CDROMEJECT) {
+ ret = cdrom_eject_check(cdi);
+ if (ret)
+ return ret;
+ }
+
+ if (cmd == CDROM_LOCKDOOR) {
+ ret = cdrom_lock_door_check(cdi, arg);
+ if (ret)
+ return ret;
+ }
+
/*
* Try the generic SCSI command ioctl's first.
*/
--
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