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@@ -16,11 +16,14 @@ void arch_pick_mmap_layout(struct mm_struct *mm)
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#endif
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mm->mmap_base = TASK_UNMAPPED_BASE;
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if (current->flags & PF_RANDOMIZE) {
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- /* Add 28bit randomness which is about 40bits of address space
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- because mmap base has to be page aligned.
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- or ~1/128 of the total user VM
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- (total user address space is 47bits) */
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+ /*
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+ * Add 28bit randomness which is about 40bits of
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+ * address space because mmap base has to be page
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+ * aligned. or ~1/128 of the total user VM (total
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+ * user address space is 47bits)
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+ */
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unsigned rnd = get_random_int() & 0xfffffff;
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+
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mm->mmap_base += ((unsigned long)rnd) << PAGE_SHIFT;
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}
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mm->get_unmapped_area = arch_get_unmapped_area;
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