From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from sc8-sf-mx1-b.sourceforge.net ([10.3.1.11] helo=sc8-sf-mx1.sourceforge.net) by sc8-sf-list1.sourceforge.net with esmtp (Exim 4.30) id 1BibNS-0005My-O4 for user-mode-linux-devel@lists.sourceforge.net; Thu, 08 Jul 2004 09:04:02 -0700 Received: from smtp004.mail.ukl.yahoo.com ([217.12.11.35]) by sc8-sf-mx1.sourceforge.net with smtp (Exim 4.34) id 1BibNS-0004hA-3G for user-mode-linux-devel@lists.sourceforge.net; Thu, 08 Jul 2004 09:04:02 -0700 From: BlaisorBlade MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200407081804.40148.blaisorblade_spam@yahoo.it> Subject: [uml-devel] I'm out for some time - SKAS host leak diagnosis. Sender: user-mode-linux-devel-admin@lists.sourceforge.net Errors-To: user-mode-linux-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Id: The user-mode Linux development list List-Post: List-Help: List-Subscribe: , List-Archive: Date: Thu, 8 Jul 2004 18:04:40 +0200 To: user-mode-linux-devel@lists.sourceforge.net 1) From 9 to 18 July, I'll be away for study - so I won't be able to participate in the UML development. Sadly, after coming back I'll be far away from Internet, after a short time; however I think I'll be able to do something before starting again (and while away I'll have my new laptop, so I'll have plenty of time for coding). 2) Especially, I'm near to fixing the host SKAS leak... seems like it's a race condition when calling alloc_ldt(): one of the two values is overwritten by the other, and so never freed. In fact for each mm init_new_context() is called when open()ing it, while __init_new_context() is called when writing a MM_COPY_SEGMENTS request onto /proc/mm (which happens shortly after). The mm->context is not locked anyway, and this is a SKAS bug: it makes sense in mainline, but not when using SKAS. The strange thing is that on host/kernel configurations where it happens, it is repeatable, i.e. does not seem a race condition. However the locking must be anyway added. Bye -- Paolo Giarrusso, aka Blaisorblade Linux registered user n. 292729 ------------------------------------------------------- This SF.Net email sponsored by Black Hat Briefings & Training. Attend Black Hat Briefings & Training, Las Vegas July 24-29 - digital self defense, top technical experts, no vendor pitches, unmatched networking opportunities. Visit www.blackhat.com _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel