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[ARM] add address randomization to mmap()
Signed-off-by: Nicolas Pitre <nicolas.pitre@linaro.org>
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@ -7,6 +7,7 @@
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#include <linux/shm.h>
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#include <linux/sched.h>
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#include <linux/io.h>
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#include <linux/random.h>
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#include <asm/cputype.h>
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#include <asm/system.h>
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@ -80,6 +81,9 @@ arch_get_unmapped_area(struct file *filp, unsigned long addr,
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start_addr = addr = TASK_UNMAPPED_BASE;
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mm->cached_hole_size = 0;
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}
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/* 8 bits of randomness in 20 address space bits */
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if (current->flags & PF_RANDOMIZE)
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addr += (get_random_int() % (1 << 8)) << PAGE_SHIFT;
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full_search:
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if (do_align)
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