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Commit 501cb16d authored by Anton Blanchard's avatar Anton Blanchard Committed by Benjamin Herrenschmidt
Browse files

powerpc: Randomise PIEs 



Randomise ELF_ET_DYN_BASE, which is used when loading position independent
executables.

Signed-off-by: default avatarAnton Blanchard <anton@samba.org>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent 002b0ec7

arch/powerpc/include/asm/elf.h

+2 −1
Original line number Diff line number Diff line
@@ -179,7 +179,8 @@ typedef elf_fpreg_t elf_vsrreghalf_t32[ELF_NVSRHALFREG]; 
   the loader.  We need to make sure that it is out of the way of the program

   that it will "exec", and that there is sufficient room for the brk.  */



#define ELF_ET_DYN_BASE         (0x20000000)

extern unsigned long randomize_et_dyn(unsigned long base);

#define ELF_ET_DYN_BASE		(randomize_et_dyn(0x20000000))



/*

 * Our registers are always unsigned longs, whether we're a 32 bit

arch/powerpc/kernel/process.c

+10 −0
Original line number Diff line number Diff line
@@ -1170,3 +1170,13 @@ unsigned long arch_randomize_brk(struct mm_struct *mm) 


	return ret;

}



unsigned long randomize_et_dyn(unsigned long base)

{

	unsigned long ret = PAGE_ALIGN(base + brk_rnd());



	if (ret < base)

		return base;



	return ret;

}