Re: [uml-devel] I ported skas3 to fc2 kernel

[BlaisorBlade <blaisorblade_spam@yahoo.it>]

Alle 01:13, venerdì 23 luglio 2004, Jinnah Dylan Hosein ha scritto:
> I ported the host-skas3-2.6.7-v1.patch to the Fedora Core 2 kernel.
>
> I used the latest fc2 2.6.6-1.435.2.3 kernel rpm.
>
> I've tested it and I was able to run a 2.4.19 uml kernel with a redhat
> 7.2 rootfs. I wasn't able to make it leak memory by running the "while
> true" bash line, but I don't understand exactly what triggers the leak so
> it's likely I didn't properly test.

Well, it's a bit difficult to trigger; to the best of my understanding, it can 
be triggered if UML is a child or grandchild of a multi-threaded process 
using the TLS, i.e. Thread-Local Storage (as KDE Konsole) running either with 
LinuxThreads support (i.e. either glibc is not NPTL-aware or is running onto 
a 2.4 host kernel).

More technically, if any process modifies its LDT (by using the modify_ldt() 
syscall), any of its child processes will have the LDT set, and if UML has 
the LDT set it will then leak memory.

That said, I don't have time to look at it well but I don't see anything bad, 
at a quick look; the port is not a simple rediff so there could be some 
little changes needed, but if it runs Ok, I wouldn't worry.

For the SKAS + UML patch: it's easy to rebuild it from the splitout version 
(you must browse the folders to find it, should be something like 
patches/2.6.7-v1), but you can get by without it, so I'll build it only if I 
get free time. I've not even had the time to join the SKAS - leak fix with 
the rest of the patch!
-- 
Paolo Giarrusso, aka Blaisorblade
Linux registered user n. 292729



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