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MIPS: Randomize mmap if randomize_va_space is set

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Fairly straight forward: For 32-bit address spaces randomize within a
16MB space, for 64-bit within a 256MB space.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/1480/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
David Daney 2010-07-19 13:14:56 -07:00 • committed by Ralf Baechle
parent b3b3c176d9
commit 1091458d09
2 changed files with 31 additions and 1 deletions
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11
arch/mips/include/asm/processor.h
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@ -33,6 +33,11 @@ extern void (*cpu_wait)(void);
extern unsigned int vced_count, vcei_count;
/*
* MIPS does have an arch_pick_mmap_layout()
*/
#define HAVE_ARCH_PICK_MMAP_LAYOUT 1
/*
* A special page (the vdso) is mapped into all processes at the very
* top of the virtual memory space.
@ -52,6 +57,9 @@ extern unsigned int vced_count, vcei_count;
* space during mmap's.
*/
#define TASK_UNMAPPED_BASE ((TASK_SIZE / 3) & ~(PAGE_SIZE))
#define TASK_IS_32BIT_ADDR 1
#endif
#ifdef CONFIG_64BIT
@ -77,6 +85,9 @@ extern unsigned int vced_count, vcei_count;
PAGE_ALIGN(TASK_SIZE32 / 3) : PAGE_ALIGN(TASK_SIZE / 3))
#define TASK_SIZE_OF(tsk) \
(test_tsk_thread_flag(tsk, TIF_32BIT_ADDR) ? TASK_SIZE32 : TASK_SIZE)
#define TASK_IS_32BIT_ADDR test_thread_flag(TIF_32BIT_ADDR)
#endif
#ifdef __KERNEL__