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Bug 609333 - out-of-bounds memory access for valuators > MAX_VALUATORS
out-of-bounds memory access for valuators > MAX_VALUATORS
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: xorg-x11-drv-evdev (Show other bugs)
All Linux
low Severity medium
: rc
: ---
Assigned To: Peter Hutterer
Depends On:
  Show dependency treegraph
Reported: 2010-06-29 21:24 EDT by Peter Hutterer
Modified: 2010-11-15 08:46 EST (History)
1 user (show)

See Also:
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 08:46:28 EST
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description Peter Hutterer 2010-06-29 21:24:02 EDT
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 2010-06-29 21:43:06 EDT
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 00:10:12 EDT

xorg-x11-drv-evdev-2.3.2-7.el6 is available in brew.
Comment 4 Vladimir Benes 2010-11-15 07:29:09 EST
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 08:46:28 EST
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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