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 23/27] compat_ioctl: move HDIO ioctl handling into drivers/ide
Date: Wed, 18 Dec 2019 23:17:47 +0100 [thread overview]
Message-ID: <CAK8P3a28Qn22Cx-bVhY5rjZVuhRXE2Jb0rezCozAhC0DZqxcUg@mail.gmail.com> (raw)
In-Reply-To: <a75a7d44ebd9ff65499445dd6b087c92345af2e4.camel@codethink.co.uk>
On Wed, Dec 18, 2019 at 10:11 PM Ben Hutchings
<ben.hutchings@codethink.co.uk> wrote:
> On Tue, 2019-12-17 at 23:17 +0100, Arnd Bergmann wrote:
> > Most of the HDIO ioctls are only used by the obsolete drivers/ide
> > subsystem, these can be handled by changing ide_cmd_ioctl() to be aware
> > of compat mode and doing the correct transformations in place and using
> > it as both native and compat handlers for all drivers.
> >
> > The SCSI drivers implementing the same commands are already doing
> > this in the drivers, so the compat_blkdev_driver_ioctl() function
> > is no longer needed now.
> >
> > The BLKSECTSET and HDIO_GETGEO_BIG ioctls are not implemented
> > in any driver any more and no longer need any conversion.
> [...]
>
> I noticed that HDIO_DRIVE_TASKFILE, handled by ide_taskfile_ioctl() in
> drivers/ide/ide-taskfile.c, never had compat handling before. After
> this patch it does, but its argument isn't passed through compat_ptr().
> Again, doesn't really matter because IDE isn't a thing on s390.
I checked again, and I think it's worse than that: ide_taskfile_ioctl()
takes an ide_task_request_t argument, which is not compatible
at all (it has two long members). I suspect what happened here
is that I confused it with ide_cmd_ioctl(), which takes a 'struct
ide_taskfile' argument that /is/ compatible.
I don't think there is a point in adding a handler now: most
users of drivers/ide are 32-bit only, and nobody complained
so far, but I would add this change if you agree:
diff --git a/drivers/ide/ide-ioctls.c b/drivers/ide/ide-ioctls.c
index f6497c817493..83afee3983fe 100644
--- a/drivers/ide/ide-ioctls.c
+++ b/drivers/ide/ide-ioctls.c
@@ -270,6 +270,9 @@ int generic_ide_ioctl(ide_drive_t *drive, struct
block_device *bdev,
case HDIO_DRIVE_TASKFILE:
if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
return -EACCES;
+ /* missing compat handler for HDIO_DRIVE_TASKFILE */
+ if (in_compat_syscall())
+ return -ENOTTY;
if (drive->media == ide_disk)
return ide_taskfile_ioctl(drive, arg);
return -ENOMSG;
Arnd
next prev parent reply other threads:[~2019-12-18 22:18 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
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 [this message]
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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