linux-kernel - Re: [PATCH 1/2] Define the EF_AS_NO_RANDOM e

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Date:	Wed, 24 Jan 2007 00:06:45 +0300
From:	Samium Gromoff <_deepfire@...lingofgreen.ru>
To:	Jakub Jelinek <jakub@...hat.com>
Cc:	Samium Gromoff <_deepfire@...lingofgreen.ru>,
	Alan <alan@...rguk.ukuu.org.uk>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] Define the EF_AS_NO_RANDOM e_flag bit

At Tue, 23 Jan 2007 15:50:18 -0500,
Jakub Jelinek wrote:
> 
> On Tue, Jan 23, 2007 at 11:28:13PM +0300, Samium Gromoff wrote:
> > Author: Samium Gromoff <deepfire@...elheise.deep.net>
> > Date:   Tue Jan 23 22:31:13 2007 +0300
> > 
> >     Define the ELF binary header flag EF_AS_NO_RANDOM
> >     
> >     EF_AS_NO_RANDOM should mean that the binary requests to not apply
> >     randomisation to address spaces of its processes.
> > 
> > diff --git a/include/linux/elf.h b/include/linux/elf.h
> > index 60713e6..58ebb47 100644
> > --- a/include/linux/elf.h
> > +++ b/include/linux/elf.h
> > @@ -172,6 +172,8 @@ typedef struct elf64_sym {
> >  
> >  #define EI_NIDENT      16
> >  
> > +#define EF_AS_NO_RANDOM 0x1    /* do not randomise the address space */
> > +
> 
> You can't make up EF_* flags this way, they are arch specific, the LSB bit
> (but many others too) are already used on many architectures.
> E.g.:
> elf/mt.h:#define EF_MT_CPU_MRISC              0x00000001      /* default */
> elf/sparc.h:#define EF_SPARCV9_PSO            0x1             /* partial store ordering */
> elf/bfin.h:#define EF_BFIN_PIC                0x00000001      /* -fpic */
> elf/alpha.h:#define EF_ALPHA_32BIT            0x00000001
> elf/mips.h:#define EF_MIPS_NOREORDER  0x00000001
> elf/m68k.h:#define EF_M68K_CF_ISA_A_NODIV     0x01  /* ISA A except for div */
> elf/sh.h:#define EF_SH1                  1
> elf/arm.h:#define EF_ARM_RELEXEC     0x01
> elf/cris.h:#define EF_CRIS_UNDERSCORE         0x00000001
> elf/ia64.h:#define EF_IA_64_TRAPNIL (1 << 0)  /* Trap NIL pointer dereferences.  */
> elf/vax.h:#define EF_VAX_NONPIC               0x0001  /* Object contains non-PIC code */
> elf/iq2000.h:#define EF_IQ2000_CPU_IQ2000     0x00000001      /* default */
> elf/frv.h:#define EF_FRV_GPR_32               0x00000001      /* -mgpr-32 */
> to name just a few.

Should we introduce per-arch asm/elf.h files to hold the relevant flag definitions then?

> 	Jakub

regards, Samium Gromoff
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