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Home » Mailing list archives » linux-kernel » 2008 » March » 22

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

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From: Andi Kleen <andi@...>
To: Nicholas Miell <nmiell@...>
Cc: Andi Kleen <andi@...>, Ulrich Drepper <drepper@...>, Andrew Morton <akpm@...>, <linux-kernel@...>, <linux-mm@...>
Subject: Re: [PATCH prototype] [0/8] Predictive bitmaps for ELF executables
Date: Saturday, March 22, 2008 - 10:29 am

On Sat, Mar 22, 2008 at 03:16:31AM -0700, Nicholas Miell wrote:

Actually it is a relatively weak argument assuming the standard
4k xattrs, but still an issue.

The other stronger argument against it is that larger xattrs tend to be
outside the inode so you would have another seek again.


Good joke.


What signed binaries? 

Anyways there are two ways to deal with this:

- Run the executable through a little filter that zeroes the bitmap before
computing the checksum.  That is how rpm -V deals with prelinked binaries which 
have a similar issue. You can probably reuse the scripts from rpm.
- Disable the pbitmap header before you sign, either by never adding
one or disabling it by turning the phdr type into a nop (should be very simple) 

-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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