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[ARM] add address randomization to mmap()

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Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
This commit is contained in:
Nicolas Pitre 2010-06-14 21:16:19 -04:00
parent 990cb8acf2
commit cc92c28b2d
1 changed files with 4 additions and 0 deletions
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4
arch/arm/mm/mmap.c
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@ -7,6 +7,7 @@
#include <linux/shm.h> #include <linux/shm.h>
#include <linux/sched.h> #include <linux/sched.h>
#include <linux/io.h> #include <linux/io.h>
#include <linux/random.h>
#include <asm/cputype.h> #include <asm/cputype.h>
#include <asm/system.h> #include <asm/system.h>
@ -80,6 +81,9 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr,
start_addr = addr = TASK_UNMAPPED_BASE; start_addr = addr = TASK_UNMAPPED_BASE;
mm->cached_hole_size = 0; mm->cached_hole_size = 0;
} }
/* 8 bits of randomness in 20 address space bits */
if (current->flags & PF_RANDOMIZE)
addr += (get_random_int() % (1 << 8)) << PAGE_SHIFT;
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if (do_align) if (do_align)