Re: Possible memory corruption in xz / liblzma in Fedora 40 & 41

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On Mon, Mar 04, 2024 at 01:46:13PM +0000, Richard W.M. Jones wrote:
> We updated xz to new version 5.6.0 last week.  It was supposed to be a
> safe change so we backported it to F40 at the request of the xz
> author.  But there's been a report of possible memory corruption:
> 
> https://bugzilla.redhat.com/show_bug.cgi?id=2267598
> 
> I've not been able to reproduce this myself, still trying.

We're still not quite sure what is going on here, however I was able
to work around it in xz (as a temporary fix).

https://bugzilla.redhat.com/show_bug.cgi?id=2267598#c5

The versions which have the bug were:

xz-5.6.0-1.fc40
xz-5.6.0-1.fc41
xz-5.6.0-2.fc40
xz-5.6.0-2.fc41

The versions which contain the workaround are:

xz-5.6.0-3.fc40
xz-5.6.0-3.fc41

If anyone hits the bug with the -1/-2 package and is able to get a
more accurate and complete stack trace, please add it to the bug,
because that's what we're really missing at the moment.

Rich.

-- 
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