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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>,
	y2038 Mailman List <y2038@lists.linaro.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Paul Mackerras <paulus@samba.org>,
	"David S. Miller" <davem@davemloft.net>,
	Michal Ostrowski <mostrows@earthlink.net>,
	Dmitry Kozlov <xeb@mail.ru>, James Chapman <jchapman@katalix.com>,
	linux-ppp@vger.kernel.org, Networking <netdev@vger.kernel.org>
Subject: Re: [PATCH v3 02/26] compat_ioctl: move simple ppp command handling into driver
Date: Thu, 18 Apr 2019 05:57:15 +0000	[thread overview]
Message-ID: <20190418055715.GC2217@ZenIV.linux.org.uk> (raw)
In-Reply-To: <20190417235300.GB2217@ZenIV.linux.org.uk>

On Thu, Apr 18, 2019 at 12:53:00AM +0100, Al Viro wrote:

> Why would you want to duplicate large chunks of anything?
> The above is not even compile-tested, but...  I can put
> together a patch if you wish.  Or am I missing something
> here?

Actually, there's another broken part - pppox.  And that one
is nastier - you've just lost everything outside of protocol
family ioctls on those sockets.  Try e.g.  SIOCGIFMTU in 32bit
process on those.

We really can't reuse native ->ioctl() there - proto family
->compat_ioctl() *must* return -ENOIOCTLCMD on everything it
doesn't handle.

  reply	other threads:[~2019-04-18  5:57 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-16 20:19 [PATCH v3 00/26] compat_ioctl: cleanups Arnd Bergmann
2019-04-16 20:19 ` [PATCH v3 02/26] compat_ioctl: move simple ppp command handling into driver Arnd Bergmann
2019-04-17 21:13   ` Al Viro
2019-04-17 22:03     ` Arnd Bergmann
2019-04-17 23:53       ` Al Viro
2019-04-18  5:57         ` Al Viro [this message]
2019-04-18 15:14         ` Arnd Bergmann
2019-04-16 20:19 ` [PATCH v3 04/26] compat_ioctl: move PPPIOCSCOMPRESS32 to ppp-generic.c Arnd Bergmann
2019-04-17 21:16   ` Al Viro
2019-04-17 21:44     ` Arnd Bergmann
2019-04-16 20:19 ` [PATCH v3 05/26] compat_ioctl: move PPPIOCSPASS32/PPPIOCSACTIVE32 to ppp_generic.c Arnd Bergmann
2019-04-16 20:19 ` [PATCH v3 06/26] compat_ioctl: handle PPPIOCGIDLE for 64-bit time_t Arnd Bergmann
2019-04-16 22:33 ` [PATCH v3 00/26] compat_ioctl: cleanups Douglas Gilbert

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