Public bug reported:
An optimization to memcpy that went in version 2.13 (used in natty) exposes
bugs in applications that perform memcpy between overlapping memory areas.
While the specification of memcpy clearly states that source and destination
should not overlap, this is the case in many applications. Of course
applications should be fixed to use memmove instead but this also affects
closed source products (most notably adobe flash player plugin). This might
also lead to subtle bugs that might not be seen as related to this issue
(original bugreport mentions squashfs).
A bugreport already tracks the issue for the flash-player
https://bugs.launchpad.net/ubuntu/+source/adobe-flashplugin/+bug/727064
ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: libc6 2.13-0ubuntu4
ProcVersionSignature: Ubuntu 2.6.38-6.34-generic 2.6.38-rc7
Uname: Linux 2.6.38-6-generic x86_64
Architecture: amd64
Date: Mon Mar 14 08:46:36 2011
ProcEnviron:
LANGUAGE=en_AU:en
PATH=(custom, user)
LANG=en_AU.utf8
SHELL=/bin/bash
SourcePackage: eglibc
UpgradeStatus: Upgraded to natty on 2010-10-10 (154 days ago)
** Affects: eglibc (Ubuntu)
Importance: Undecided
Status: New
** Affects: eglibc (Fedora)
Importance: Unknown
Status: Unknown
** Tags: amd64 apport-bug natty
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https://bugs.launchpad.net/bugs/734694
Title:
Optimization to amd64 memcpy make software behave diffrently on 32 and
64 bit archs.
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