Bug 609333 - out-of-bounds memory access for valuators > MAX_VALUATORS
Summary: out-of-bounds memory access for valuators > MAX_VALUATORS
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: xorg-x11-drv-evdev (Show other bugs)
(Show other bugs)
Version: 6.0
Hardware: All Linux
Target Milestone: rc
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Assignee: Peter Hutterer
QA Contact: desktop-bugs@redhat.com
Depends On:
TreeView+ depends on / blocked
Reported: 2010-06-30 01:24 UTC by Peter Hutterer
Modified: 2010-11-15 13:46 UTC (History)
1 user (show)

Fixed In Version: xorg-x11-drv-evdev-2.3.2-7.el6
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2010-11-15 13:46:28 UTC
Type: ---
Regression: ---
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Documentation: ---
Verified Versions:
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)

Description Peter Hutterer 2010-06-30 01:24:02 UTC
Description of problem:
An evdev device with more than 36 axes overruns internal array boundaries. This can currently only happen with absolute devices since the kernel does not provide for > 36 relative axes.

Version-Release number of selected component (if applicable):

How reproducible:
Plug in a device with more than 36 absolute axes (uinput may be used). 
EvdevAddAbsClass will overwrite memory when resetting pEvdev->vals. There's no visible output because the structs overwritten are internal to evdev. Verification by inspection or with gdb.
Additional info:

Example uinput device to reproduce this behaviour is here:

Comment 1 RHEL Product and Program Management 2010-06-30 01:43:06 UTC
This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux major release.  Product Management has requested further
review of this request by Red Hat Engineering, for potential inclusion in a Red
Hat Enterprise Linux Major release.  This request is not yet committed for

Comment 2 Peter Hutterer 2010-06-30 04:10:12 UTC

xorg-x11-drv-evdev-2.3.2-7.el6 is available in brew.

Comment 4 Vladimir Benes 2010-11-15 12:29:09 UTC
using in comment #0 mentioned test device w/ 63 axes I can see warning in /var/log/Xorg.0.log:

(II) XINPUT: Adding extended input device "allaxes test device" (type: TOUCHPAD)
(WW) allaxes test device: found 63 axes, limiting to 36.
(WW) Device 'allaxes test device' has 36 axes, only using first 36.

which is correct behaviour

Comment 5 releng-rhel@redhat.com 2010-11-15 13:46:28 UTC
Red Hat Enterprise Linux 6.0 is now available and should resolve
the problem described in this bug report. This report is therefore being closed
with a resolution of CURRENTRELEASE. You may reopen this bug report if the
solution does not work for you.

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