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Commit 94109102 authored by Franck Bui-Huu's avatar Franck Bui-Huu Committed by Ralf Baechle
Browse files

[MIPS] User stack pointer randomisation 



Signed-off-by: default avatarFranck Bui-Huu <fbuihuu@gmail.com>
Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent c55757b2

arch/mips/kernel/process.c

+14 −0
Original line number Diff line number Diff line
@@ -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;

}

include/asm-mips/system.h

+1 −1
Original line number Diff line number Diff line
@@ -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 */