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[S390] Randomize PIEs

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

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2011-01-12 09:55:31 +01:00 committed by Martin Schwidefsky
parent 3351918282
commit d2c9dfccbc
2 changed files with 14 additions and 1 deletions
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4
arch/s390/include/asm/elf.h
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@ -161,7 +161,9 @@ extern unsigned int vdso_enabled;
use of this is to invoke "./ld.so someprog" to test out a new version of
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 (STACK_TOP / 3 * 2)
extern unsigned long randomize_et_dyn(unsigned long base);
#define ELF_ET_DYN_BASE (randomize_et_dyn(STACK_TOP / 3 * 2))
/* This yields a mask that user programs can use to figure out what
instruction set this CPU supports. */

11
arch/s390/kernel/process.c
View file

@ -359,3 +359,14 @@ unsigned long arch_randomize_brk(struct mm_struct *mm)
return mm->brk;
return ret;
}
unsigned long randomize_et_dyn(unsigned long base)
{
unsigned long ret = PAGE_ALIGN(base + brk_rnd());
if (!(current->flags & PF_RANDOMIZE))
return base;
if (ret < base)
return base;
return ret;
}