Bug#391353: [Pkg-aide-maintainers] Bug#391353: aide: Doesn't work suitably on Xen enabled kernel because of statically linked libc

[Marc Haber]

clone #391353 -1
retitle -1 Should not DoS system if statically linked binary is run
reassign -1 linux-image-2.6.18-1-xen-686
submitter -1 Marc Haber <mh+debian-packages at zugschlus.de>
block #391353 with -1
thanks


On Fri, Oct 06, 2006 at 08:58:16AM +0200, Raphael Hertzog wrote:
> I upgraded my personal server to etch and choosed to use a Xen enabled
> kernel since we're going to have Xen support in etch (and also because
> we're using this for the new alioth.debian.org so I wanted to have a
> testbed for me).
> 
> This morning my server was almost unreachable and while looking through
> the logs I discovered those messages:
> Oct  6 05:17:34 arrakeen kernel: printk: 246 messages suppressed.
> Oct  6 05:17:34 arrakeen kernel: 4gb seg fixup, process aide (pid 1627), cs:ip 73:080ae335
> Oct  6 05:17:40 arrakeen kernel: printk: 291 messages suppressed.
> Oct  6 05:17:40 arrakeen kernel: 4gb seg fixup, process aide (pid 1627), cs:ip 73:080ae335
> 
> Those messages appear when you use the standard libc6 instead of libc6-xen
> on a Xen enabled kernel. However I have libc6-xen installed.... but aide
> is using its own statically linked libc6 which thus generates this
> message.
> 
> Those messages means that the kernel worked around the bad libc6 but it's
> extremely ineffective in doing so, so much that it effectively DOSsed my
> server during the 3 hours when aide was running.

I consider this a kernel bug. The kernel should not DoS the system in
case a binary statically linked against a normal glibc is run.

Greetings
Marc

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