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[S390] Randomize lower bits of stack address

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Randomize the lower bits of the stack address like x86 and powerpc.

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 09:55:28 +01:00 committed by Martin Schwidefsky
parent df1ca53cba
commit 9887a1fcdd
2 changed files with 10 additions and 1 deletions
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2
arch/s390/include/asm/system.h
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@ -449,7 +449,7 @@ extern void (*_machine_restart)(char *command);
extern void (*_machine_halt)(void);
extern void (*_machine_power_off)(void);
#define arch_align_stack(x) (x)
extern unsigned long arch_align_stack(unsigned long sp);
static inline int tprot(unsigned long addr)
{

9
arch/s390/kernel/process.c
View File

@ -30,9 +30,11 @@
#include <linux/tick.h>
#include <linux/elfcore.h>
#include <linux/kernel_stat.h>
#include <linux/personality.h>
#include <linux/syscalls.h>
#include <linux/compat.h>
#include <linux/kprobes.h>
#include <linux/random.h>
#include <asm/compat.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
@ -332,3 +334,10 @@ unsigned long get_wchan(struct task_struct *p)
}
return 0;
}
unsigned long arch_align_stack(unsigned long sp)
{
if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
sp -= get_random_int() & ~PAGE_MASK;
return sp & ~0xf;
}