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From: Arnd Bergmann <arnd@arndb.de>
To: Ben Hutchings <ben.hutchings@codethink.co.uk>
Cc: Jens Axboe <axboe@kernel.dk>,
	"James E.J. Bottomley" <jejb@linux.ibm.com>,
	"Martin K. Petersen" <martin.petersen@oracle.com>,
	linux-scsi <linux-scsi@vger.kernel.org>,
	linux-block <linux-block@vger.kernel.org>,
	y2038 Mailman List <y2038@lists.linaro.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Christoph Hellwig <hch@lst.de>,
	"open list:DOCUMENTATION" <linux-doc@vger.kernel.org>,
	Jonathan Corbet <corbet@lwn.net>,
	Al Viro <viro@zeniv.linux.org.uk>,
	Linux FS-devel Mailing List <linux-fsdevel@vger.kernel.org>
Subject: Re: [PATCH v2 21/27] compat_ioctl: move cdrom commands into cdrom.c
Date: Thu, 19 Dec 2019 13:15:02 +0100	[thread overview]
Message-ID: <CAK8P3a3W+5RTa5jTunotZyV=hgXTxJaPqz_5kJnsdbvSZZPmjg@mail.gmail.com> (raw)
In-Reply-To: <5826d31fcf2fcbe25bf2396e32df3df7d585dd99.camel@codethink.co.uk>

On Wed, Dec 18, 2019 at 9:11 PM Ben Hutchings
<ben.hutchings@codethink.co.uk> wrote:
>
> On Tue, 2019-12-17 at 23:17 +0100, Arnd Bergmann wrote:
> [...]
> > @@ -1710,6 +1711,38 @@ static int idecd_ioctl(struct block_device *bdev, fmode_t mode,
> >       return ret;
> >  }
> >
> > +#ifdef CONFIG_COMPAT
> > +static int idecd_locked_compat_ioctl(struct block_device *bdev, fmode_t mode,
> > +                     unsigned int cmd, unsigned long arg)
> > +{
> > +     struct cdrom_info *info = ide_drv_g(bdev->bd_disk, cdrom_info);
> > +     int err;
> > +
> > +     switch (cmd) {
> > +     case CDROMSETSPINDOWN:
> > +             return idecd_set_spindown(&info->devinfo, arg);
> > +     case CDROMGETSPINDOWN:
> > +             return idecd_get_spindown(&info->devinfo, arg);
>
> compat_ptr() should also be applied to the argument for these two
> commands, though I'm fairly sure IDE drivers have never been useful on
> s390 so it doesn't matter in practice.

Agreed on both, fixed by folding in this change:

diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
index 2de6e8ace957..e09b949a7c46 100644
--- a/drivers/ide/ide-cd.c
+++ b/drivers/ide/ide-cd.c
@@ -1716,19 +1716,20 @@ static int idecd_locked_compat_ioctl(struct
block_device *bdev, fmode_t mode,
                        unsigned int cmd, unsigned long arg)
 {
        struct cdrom_info *info = ide_drv_g(bdev->bd_disk, cdrom_info);
+       void __user *argp = compat_ptr(arg);
        int err;

        switch (cmd) {
        case CDROMSETSPINDOWN:
-               return idecd_set_spindown(&info->devinfo, arg);
+               return idecd_set_spindown(&info->devinfo, (unsigned long)argp);
        case CDROMGETSPINDOWN:
-               return idecd_get_spindown(&info->devinfo, arg);
+               return idecd_get_spindown(&info->devinfo, (unsigned long)argp);
        default:
                break;
        }

        return cdrom_ioctl(&info->devinfo, bdev, mode, cmd,
-                          (unsigned long)compat_ptr(arg));
+                          (unsigned long)argp);
 }

static int idecd_compat_ioctl(struct block_device *bdev, fmode_t mode,

Unfortunately the generic_ide_ioctl() call still needs an unconverted arg,
so I can't just use compat_ptr() to call the native idecd_locked_ioctl()
for all commands.

Thanks,

       Arnd

  reply	other threads:[~2019-12-19 12:15 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-17 22:16 [GIT PULL v2 00/27] block, scsi: final compat_ioctl cleanup Arnd Bergmann
2019-12-17 22:16 ` [PATCH v2 01/27] pktcdvd: fix regression on 64-bit architectures Arnd Bergmann
2019-12-17 22:16 ` [PATCH v2 02/27] compat_ioctl: block: handle BLKREPORTZONE/BLKRESETZONE Arnd Bergmann
2019-12-17 22:16 ` [PATCH v2 03/27] compat_ioctl: block: handle BLKGETZONESZ/BLKGETNRZONES Arnd Bergmann
2019-12-17 22:16 ` [PATCH v2 04/27] compat_ioctl: block: handle add zone open, close and finish ioctl Arnd Bergmann
2019-12-17 22:16 ` [PATCH v2 05/27] compat_ioctl: block: handle Persistent Reservations Arnd Bergmann
2019-12-17 22:16 ` [PATCH v2 06/27] compat: ARM64: always include asm-generic/compat.h Arnd Bergmann
2019-12-17 22:16 ` [PATCH v2 07/27] compat: provide compat_ptr() on all architectures Arnd Bergmann
2019-12-17 22:16 ` [PATCH v2 08/27] compat: scsi: sg: fix v3 compat read/write interface Arnd Bergmann
2019-12-17 22:16 ` [PATCH v2 09/27] compat_ioctl: block: add blkdev_compat_ptr_ioctl Arnd Bergmann
2019-12-17 22:16 ` [PATCH v2 10/27] compat_ioctl: ubd, aoe: use blkdev_compat_ptr_ioctl Arnd Bergmann
2019-12-17 22:16 ` [PATCH v2 11/27] compat_ioctl: move CDROM_SEND_PACKET handling into scsi Arnd Bergmann
2019-12-17 22:16 ` [PATCH v2 12/27] compat_ioctl: move CDROMREADADIO to cdrom.c Arnd Bergmann
2019-12-17 22:16 ` [PATCH v2 13/27] compat_ioctl: cdrom: handle CDROM_LAST_WRITTEN Arnd Bergmann
2019-12-17 22:16 ` [PATCH v2 14/27] compat_ioctl: block: handle cdrom compat ioctl in non-cdrom drivers Arnd Bergmann
2019-12-17 22:16 ` [PATCH v2 15/27] compat_ioctl: add scsi_compat_ioctl Arnd Bergmann
2019-12-17 22:16 ` [PATCH v2 16/27] compat_ioctl: bsg: add handler Arnd Bergmann
2019-12-17 22:16 ` [PATCH v2 17/27] compat_ioctl: ide: floppy: " Arnd Bergmann
2019-12-18 18:45   ` Ben Hutchings
2019-12-18 19:28     ` Arnd Bergmann
2019-12-17 22:16 ` [PATCH v2 18/27] compat_ioctl: scsi: move ioctl handling into drivers Arnd Bergmann
2019-12-18 19:57   ` Ben Hutchings
2019-12-19 12:06     ` Arnd Bergmann
2019-12-17 22:17 ` [PATCH v2 19/27] compat_ioctl: move sys_compat_ioctl() to ioctl.c Arnd Bergmann
2019-12-17 22:17 ` [PATCH v2 20/27] compat_ioctl: simplify the implementation Arnd Bergmann
2020-02-07  7:22   ` youling257
2020-02-07 17:06     ` Arnd Bergmann
2020-02-07 20:02       ` youling 257
2019-12-17 22:17 ` [PATCH v2 21/27] compat_ioctl: move cdrom commands into cdrom.c Arnd Bergmann
2019-12-18 20:11   ` Ben Hutchings
2019-12-19 12:15     ` Arnd Bergmann [this message]
2019-12-17 22:17 ` [PATCH v2 22/27] compat_ioctl: scsi: handle HDIO commands from drivers Arnd Bergmann
2019-12-17 22:17 ` [PATCH v2 23/27] compat_ioctl: move HDIO ioctl handling into drivers/ide Arnd Bergmann
2019-12-18 21:11   ` Ben Hutchings
2019-12-18 22:17     ` Arnd Bergmann
2019-12-18 22:20       ` Ben Hutchings
2019-12-17 22:17 ` [PATCH v2 24/27] compat_ioctl: block: move blkdev_compat_ioctl() into ioctl.c Arnd Bergmann
2019-12-17 22:17 ` [PATCH v2 25/27] compat_ioctl: block: simplify compat_blkpg_ioctl() Arnd Bergmann
2019-12-17 22:17 ` [PATCH v2 26/27] compat_ioctl: simplify up block/ioctl.c Arnd Bergmann
2019-12-17 22:17 ` [PATCH v2 27/27] Documentation: document ioctl interfaces better Arnd Bergmann
2019-12-18 22:45   ` Ben Hutchings
2019-12-19 20:05     ` Arnd Bergmann
2019-12-18 17:24 ` [GIT PULL v2 00/27] block, scsi: final compat_ioctl cleanup Arnd Bergmann
2019-12-19  3:18   ` Martin K. Petersen

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