linux-kernel - Re: 2.6.36/2.6.37: broken compatibility with userspace input-utils ?

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Date:	Mon, 24 Jan 2011 19:32:08 -0500
From:	Mark Lord <kernel@...savvy.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
CC:	Linux Kernel <linux-kernel@...r.kernel.org>,
	linux-input@...r.kernel.org
Subject: Re: 2.6.36/2.6.37: broken compatibility with userspace input-utils
 ?

On 11-01-24 12:54 PM, Dmitry Torokhov wrote:
> Hi Mark,
> 
> On Sun, Jan 23, 2011 at 12:03:47PM -0500, Mark Lord wrote:
>> As of the 2.6.36 kernel, the userspace commands lsinput and input-kbd
>> no longer work.  And if I grab newer/patched versions of those from the latest
>> Ubuntu 10.10, then those newer/patched versions do not work with kernels
>> *before* 2.6.36.
>>
>> At first glance, this looks like a visible regression.
>> Is there a version of input-utils that works with both
>> old and new kernels ?
>>
> 
> The event protocol number was updated to reflect support of large
> scancodes, unfortunately some of the utilities expected exact version
> and refuse to work with updated one.


So is there a danger of memory corruption if running a binary
that doesn't check the version number?

In other words, did the size and/or format of returned data
change for an ioctl() or something here?

If so, then that is a user-visible regression, and shouldn't happen.
One correct way to handle that, would be to create a new ioctl(),
and mark the old one as deprecated, for removal a few years later perhaps.

???

Thanks
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