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From: Al Viro <viro@ZenIV.linux.org.uk>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Linux FS-devel Mailing List <linux-fsdevel@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v2 01/17] compat_ioctl: add generic_compat_ioctl_ptrarg()
Date: Sun, 28 Oct 2018 17:07:01 +0000	[thread overview]
Message-ID: <20181028170701.GA8132@ZenIV.linux.org.uk> (raw)
In-Reply-To: <CAK8P3a2PTaanqmJycLCJ5QgNFXONb7nVye1=TJST639wDBNpAQ@mail.gmail.com>

On Thu, Sep 13, 2018 at 12:29:02PM +0200, Arnd Bergmann wrote:

> I was hoping that the _ptrarg suffix gives enough warning here,
> but maybe not. I was careful to only use it in cases that I
> checked are safe, either using only pointer arguments, or
> no arguments.
> 
> What we might do for further clarification (besides adding a
> comment next to the declaration), would be to add a
> complementary generic_compat_ioctl_intarg() that skips
> the compat_ptr(). There are only a handful of drivers that
> would use this though.

... and the next Monday zeniv went down until the end of September,
so I'd missed any resends that might've happened in that window.

It's _probably_ too late for this cycle, but let's deal with that
thing properly for the next one.  A couple of comments from rereading
the thread:
	* generic_compat_ioctl_fthagn^H^H^H^H^H^Hptrarg should not
be EXPORT_SYMBOL_GPL().  I'm sorry, but this is beyond ridiculous -
"call native ioctl, with the last argument interpreted as an address
from 32bit process POV and converted to 64bit equivalent" should
not be copyrightable at all, and there's really only one natural
way to express that.  Use EXPORT_SYMBOL().  And I'd consider names
like compat_ptr_ioctl() - easier to type and less opaque...
	* rtc patch makes RTC_IRQP_SET32 et.al. accepted by 64bit
syscall.  Which is a behaviour change that might or might not be
OK, but it needs to be clearly stated.

Could you resend the series, with ACKs attached, etc., either
based on -next (if done now) or on -rc1 (once released)?

  reply	other threads:[~2018-10-29  1:52 UTC|newest]

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-12 15:01 Arnd Bergmann
2018-09-12 15:01 ` [PATCH v2 02/17] compat_ioctl: move drivers to generic_compat_ioctl_ptrarg Arnd Bergmann
2018-09-12 15:33   ` Jason Gunthorpe
2018-09-12 16:20     ` Arnd Bergmann
2018-09-12 18:13   ` Greg Kroah-Hartman
2018-09-16 19:07   ` Jarkko Sakkinen
2018-09-12 15:01 ` [PATCH v2 03/17] compat_ioctl: use correct compat_ptr() translation in drivers Arnd Bergmann
2018-09-12 18:13   ` Greg Kroah-Hartman
2018-09-13  0:48   ` Andrew Donnellan
2018-09-13 11:03   ` Felipe Balbi
2018-09-12 15:01 ` [PATCH v2 04/17] ceph: fix compat_ioctl for ceph_dir_operations Arnd Bergmann
2018-09-12 16:12   ` David Laight
2018-09-12 16:25     ` Arnd Bergmann
2018-09-13  0:48   ` Yan, Zheng
2018-09-12 15:08 ` [PATCH v2 05/17] compat_ioctl: move more drivers to generic_compat_ioctl_ptrarg Arnd Bergmann
2018-09-12 15:08   ` [PATCH v2 06/17] compat_ioctl: move rtc handling into rtc-dev.c Arnd Bergmann
2018-09-12 20:00     ` Alexandre Belloni
2018-09-12 15:08   ` [PATCH v2 07/17] compat_ioctl: move tape handling into drivers Arnd Bergmann
2018-09-12 15:08   ` [PATCH v2 08/17] compat_ioctl: remove keyboard ioctl translation Arnd Bergmann
2018-09-12 15:08   ` [PATCH v2 09/17] compat_ioctl: remove HIDIO translation Arnd Bergmann
2018-09-12 15:56   ` [PATCH v2 05/17] compat_ioctl: move more drivers to generic_compat_ioctl_ptrarg Jason Gunthorpe
2018-09-12 15:58   ` Daniel Vetter
2018-09-12 16:01   ` Mauro Carvalho Chehab
2018-09-12 18:13   ` Greg Kroah-Hartman
2018-09-14 14:23   ` David Sterba
2018-09-14 20:35   ` Darren Hart
2018-09-14 20:57     ` Al Viro
2018-09-18 17:51       ` Darren Hart
2018-09-18 17:59         ` Jason Gunthorpe
2018-09-24 20:18           ` Arnd Bergmann
2018-09-24 20:35             ` Jason Gunthorpe
2018-09-24 21:17               ` Arnd Bergmann
2018-09-17  9:33   ` Jonathan Cameron
2018-10-06  7:05   ` Bjorn Andersson
2018-09-12 15:13 ` [PATCH v2 10/17] compat_ioctl: remove translation for sound ioctls Arnd Bergmann
2018-09-12 15:13   ` [PATCH v2 11/17] compat_ioctl: remove isdn ioctl translation Arnd Bergmann
2018-09-12 15:13   ` [PATCH v2 12/17] compat_ioctl: remove IGNORE_IOCTL() Arnd Bergmann
2018-09-12 15:13   ` [PATCH v2 13/17] compat_ioctl: remove /dev/random commands Arnd Bergmann
2018-09-12 18:13     ` Greg Kroah-Hartman
2018-09-12 15:13   ` [PATCH v2 14/17] compat_ioctl: remove joystick ioctl translation Arnd Bergmann
2018-09-12 15:13   ` [PATCH v2 15/17] compat_ioctl: remove PCI " Arnd Bergmann
2018-09-12 15:13   ` [PATCH v2 16/17] compat_ioctl: remove /dev/raw " Arnd Bergmann
2018-09-12 15:13   ` [PATCH v2 17/17] compat_ioctl: remove last RAID handling code Arnd Bergmann
2018-09-13 13:37   ` [PATCH v2 10/17] compat_ioctl: remove translation for sound ioctls Takashi Iwai
2018-09-13  2:07 ` [PATCH v2 01/17] compat_ioctl: add generic_compat_ioctl_ptrarg() Al Viro
2018-09-13 10:29   ` Arnd Bergmann
2018-10-28 17:07     ` Al Viro [this message]
2018-10-29  9:50       ` Arnd Bergmann

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