Messages in this thread | | | Date | Mon, 24 Mar 2008 17:24:28 +0100 | From | Pavel Machek <> | Subject | Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF executables |
| |
On Sun 2008-03-23 18:08:27, Andi Kleen wrote: > > Is this good idea? Attacker can send you binary with the bitmap > > inverted, it is now slow on your system and signature matches. > > The first run will fix up any missing bits in the bitmap. Right > now it cannot get rid of unnecessary pages though unless you > disable early_fault. > > > ...might be important for benchmarks... 'here, see, Oracle is slow. > > Feel free to verify the signature'. > > > > ...ok, I guess it is not too serious, because it is similar to > > fragmentation.... > > It is actually far better than fragmentation because the bitmap > loader does IO always in big chunks -- not much seeking will go on. > The only problem is some wasted mmeory and more IO bandwidth > usage (but typically binaries are not bigger than a few MB so > it's not too dramatic) > > So in summary I don't think it's an issue.
Agreed.
-- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
| |