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Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF executables

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From: Andi Kleen <andi@...>
To: Pavel Machek <pavel@...>
Cc: Andi Kleen <andi@...>, Nicholas Miell <nmiell@...>, Ulrich Drepper <drepper@...>, Andrew Morton <akpm@...>, <linux-kernel@...>, <linux-mm@...>
Subject: Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF executables
Date: Sunday, March 23, 2008 - 1:08 pm

> Is this good idea? Attacker can send you binary with the bitmap

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.


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.

-Andi
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Messages in current thread:
[PATCH prototype] [0/8] Predictive bitmaps for ELF executables, Andi Kleen, (Mon Mar 17, 9:09 pm)
[PATCH prototype] [8/8] Add mmap_full_slurp support, Andi Kleen, (Mon Mar 17, 9:09 pm)
[PATCH prototype] [7/8] Add the sysctls to control pbitmaps, Andi Kleen, (Mon Mar 17, 9:09 pm)
[PATCH prototype] [6/8] Core predictive bitmap engine, Andi Kleen, (Mon Mar 17, 9:09 pm)
[PATCH prototype] [5/8] Add ELF constants for pbitmaps, Andi Kleen, (Mon Mar 17, 9:09 pm)
[PATCH prototype] [4/8] Add readahead function to read-ahead..., Andi Kleen, (Mon Mar 17, 9:09 pm)
[PATCH prototype] [3/8] Make readahead max pinned value a sy..., Andi Kleen, (Mon Mar 17, 9:09 pm)
[PATCH prototype] [2/8] Add support to override mmap exec wr..., Andi Kleen, (Mon Mar 17, 9:09 pm)
[PATCH prototype] [1/8] Give ELF shdr types a name, Andi Kleen, (Mon Mar 17, 9:09 pm)
Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Andrew Morton, (Tue Mar 18, 3:36 am)
Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Andi Kleen, (Tue Mar 18, 10:18 am)
Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Andrew Morton, (Tue Mar 18, 12:57 pm)
Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Andi Kleen, (Tue Mar 18, 1:20 pm)
Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Andrew Morton, (Tue Mar 18, 1:44 pm)
Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Andi Kleen, (Wed Mar 19, 4:32 am)
Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Andrew Morton, (Wed Mar 19, 5:04 am)
Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Diego Calleja, (Wed Mar 19, 8:15 pm)
Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Ulrich Drepper, (Wed Mar 19, 6:45 pm)
Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Andi Kleen, (Thu Mar 20, 5:00 am)
Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Ulrich Drepper, (Fri Mar 21, 1:15 pm)
Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Andi Kleen, (Fri Mar 21, 1:26 pm)
Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Ulrich Drepper, (Sat Mar 22, 12:38 am)
Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Ulrich Drepper, (Sat Mar 22, 12:36 am)
Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Andi Kleen, (Sat Mar 22, 3:17 am)
Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Nicholas Miell, (Sat Mar 22, 3:24 am)
Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Andi Kleen, (Sat Mar 22, 5:10 am)
Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Ulrich Drepper, (Mon Mar 24, 12:20 am)
Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Nicholas Miell, (Mon Mar 24, 1:16 am)
Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Ulrich Drepper, (Mon Mar 24, 3:42 pm)
Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Andi Kleen, (Tue Mar 25, 3:54 am)
Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Ulrich Drepper, (Wed Mar 26, 2:15 pm)
Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Andi Kleen, (Wed Mar 26, 2:54 pm)
Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Nicholas Miell, (Mon Mar 24, 5:47 pm)
Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Andi Kleen, (Mon Mar 24, 1:26 am)
Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Nicholas Miell, (Sat Mar 22, 6:16 am)
Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Andi Kleen, (Sat Mar 22, 10:29 am)
Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Pavel Machek, (Sun Mar 23, 9:25 am)
Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Andi Kleen, (Sun Mar 23, 1:08 pm)
Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Pavel Machek, (Mon Mar 24, 12:24 pm)
Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., Andrew Morton, (Wed Mar 19, 7:12 pm)
Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF execu..., David Miller, (Wed Mar 19, 8:09 pm)

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