| 2011-03-07 08:27:11 |
Eduard Hasenleithner |
bug |
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added bug |
| 2011-03-07 08:27:11 |
Eduard Hasenleithner |
attachment added |
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Patch from the xorg repository https://bugs.launchpad.net/bugs/730488/+attachment/1891113/+files/xf86-scale-high-resolution.diff |
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| 2011-03-07 12:02:24 |
bugbot |
affects |
xorg (Ubuntu) |
xorg-server (Ubuntu) |
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| 2011-03-07 14:30:40 |
bugbot |
tags |
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lucid |
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| 2011-03-07 17:38:07 |
Brian Murray |
bug |
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added subscriber Ubuntu Review Team |
| 2011-03-07 17:38:09 |
Brian Murray |
tags |
lucid |
lucid patch |
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| 2011-03-07 21:06:40 |
Bryce Harrington |
bug |
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added subscriber Ubuntu Sponsors Team |
| 2011-03-07 21:11:59 |
Bryce Harrington |
xorg-server (Ubuntu): status |
New |
Confirmed |
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| 2011-03-07 22:47:55 |
Eduard Hasenleithner |
attachment added |
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debdiff from applied patch https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/730488/+attachment/1892854/+files/xorg-server_1.7.6-2ubuntu7.5.debdiff |
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| 2011-03-08 02:35:28 |
Bryce Harrington |
description |
Binary package hint: xorg
The xf86ScaleAxis function is used to scale x and y axis values of input devices between different resolutions. Due to internal integer overflow, the acceptable value range for its arguments are limited below their type (signed 32bit integer). This imposes a problem for high resolution devices, like the wacom Intuos 4 L, which have a total horizontal resolution of 65024. Example: when doing a scaling with a range of more than 46340 (Sxhigh-Sxlow), the integer X will wrap into negative values, and truncated to 0 at the end.
Among other devices, this problem affects wacom Intuos 4 L and XL tablets when compiling the xf86-input-wacom driver version 0.10.9 and above. Previous versions work, because they don't use the xf86ScaleAxis function. With current xorg releases this problem does not happen either, because a upstream patch (http://lists.x.org/archives/xorg-devel/2010-April/007333.html) already extends the acceptable value range. A solution would be to include this patch into 10.04, because there is still quite a time till the next LTS.
If there is a chance for getting this patch included into 10.04 I'm willing to make a patch specific for the current xorg-server-1.7.6 package and test it. |
[Impact]
On certain higher resolution touchpads, an integer overflow can occur since their range exceeds the maximum int value.
This issue can crop up on Lucid if the user self-compiles -wacom or uses a backport package from a PPA. It does not affect the shipped version of -wacom in Lucid.
[Development Solution]
This was fixed upstream by using a 64-bit integer rather than 32-bit to extend the range. This fix is included in the upstream version of xorg-server we are shipping in natty.
[Stable Solution]
A backport of the fix has been made for Lucid.
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/730488/+attachment/1891113/+files/xf86-scale-high-resolution.diff
[Test Case]
See below (requires affected hardware and rebuilding -wacom on Lucid)
[Regression Potential]
None. No APIs are changed, and increase of the data type has no other code effects.
[Original Report]
The xf86ScaleAxis function is used to scale x and y axis values of input devices between different resolutions. Due to internal integer overflow, the acceptable value range for its arguments are limited below their type (signed 32bit integer). This imposes a problem for high resolution devices, like the wacom Intuos 4 L, which have a total horizontal resolution of 65024. Example: when doing a scaling with a range of more than 46340 (Sxhigh-Sxlow), the integer X will wrap into negative values, and truncated to 0 at the end.
Among other devices, this problem affects wacom Intuos 4 L and XL tablets when compiling the xf86-input-wacom driver version 0.10.9 and above. Previous versions work, because they don't use the xf86ScaleAxis function. With current xorg releases this problem does not happen either, because a upstream patch (http://lists.x.org/archives/xorg-devel/2010-April/007333.html) already extends the acceptable value range. A solution would be to include this patch into 10.04, because there is still quite a time till the next LTS.
If there is a chance for getting this patch included into 10.04 I'm willing to make a patch specific for the current xorg-server-1.7.6 package and test it. |
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| 2011-03-08 02:35:53 |
Bryce Harrington |
bug |
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added subscriber Ubuntu Stable Release Updates Team |
| 2011-03-08 02:36:27 |
Bryce Harrington |
nominated for series |
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Ubuntu Lucid |
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| 2011-03-08 02:36:27 |
Bryce Harrington |
bug task added |
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xorg-server (Ubuntu Lucid) |
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| 2011-03-08 02:36:27 |
Bryce Harrington |
nominated for series |
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Ubuntu Natty |
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| 2011-03-08 02:36:27 |
Bryce Harrington |
bug task added |
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xorg-server (Ubuntu Natty) |
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| 2011-03-08 02:36:39 |
Bryce Harrington |
xorg-server (Ubuntu Natty): status |
Confirmed |
Fix Released |
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| 2011-03-08 02:36:42 |
Bryce Harrington |
xorg-server (Ubuntu Lucid): status |
New |
Fix Committed |
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| 2011-03-08 02:36:47 |
Bryce Harrington |
xorg-server (Ubuntu Lucid): importance |
Undecided |
Medium |
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| 2011-03-08 02:36:51 |
Bryce Harrington |
xorg-server (Ubuntu Natty): importance |
Undecided |
High |
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| 2011-03-08 08:19:23 |
Martin Pitt |
bug |
|
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added subscriber SRU Verification |
| 2011-03-08 08:19:27 |
Martin Pitt |
tags |
lucid patch |
lucid patch verification-needed |
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| 2011-03-08 16:04:24 |
Benjamin Drung |
removed subscriber Ubuntu Sponsors Team |
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| 2011-03-08 22:37:29 |
Launchpad Janitor |
branch linked |
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lp:ubuntu/lucid-proposed/xorg-server |
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| 2011-04-21 09:48:34 |
madbiologist |
tags |
lucid patch verification-needed |
lucid patch |
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| 2011-04-21 09:49:42 |
madbiologist |
tags |
lucid patch |
lucid patch verification-done |
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| 2011-04-26 06:58:53 |
Launchpad Janitor |
xorg-server (Ubuntu Lucid): status |
Fix Committed |
Fix Released |
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| 2011-04-28 19:29:19 |
Yvon TANGUY |
bug |
|
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added subscriber Yvon TANGUY |
| 2011-05-25 15:05:13 |
Cedric |
attachment added |
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Xorg.0.log.old https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/730488/+attachment/2142371/+files/Xorg.0.log.old |
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