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[MIPS] User stack pointer randomisation

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Signed-off-by: Franck Bui-Huu <fbuihuu@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Franck Bui-Huu 2007-07-19 14:04:21 +02:00 committed by Ralf Baechle
parent c55757b261
commit 941091024e
2 changed files with 15 additions and 1 deletions
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14
arch/mips/kernel/process.c
View file

@ -25,7 +25,9 @@
#include <linux/init.h>
#include <linux/completion.h>
#include <linux/kallsyms.h>
#include <linux/random.h>
#include <asm/asm.h>
#include <asm/bootinfo.h>
#include <asm/cpu.h>
#include <asm/dsp.h>
@ -460,3 +462,15 @@ unsigned long get_wchan(struct task_struct *task)
out:
return pc;
}
/*
* Don't forget that the stack pointer must be aligned on a 8 bytes
* boundary for 32-bits ABI and 16 bytes for 64-bits ABI.
*/
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 & ALMASK;
}

2
include/asm-mips/system.h
View file

@ -470,6 +470,6 @@ extern int stop_a_enabled;
*/
#define __ARCH_WANT_UNLOCKED_CTXSW
#define arch_align_stack(x) (x)
extern unsigned long arch_align_stack(unsigned long sp);
#endif /* _ASM_SYSTEM_H */