diff options
Diffstat (limited to 'arch/x86/mm/mmap_64.c')
| -rw-r--r-- | arch/x86/mm/mmap_64.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/arch/x86/mm/mmap_64.c b/arch/x86/mm/mmap_64.c index 80bba0dc000..ffb71a31bb6 100644 --- a/arch/x86/mm/mmap_64.c +++ b/arch/x86/mm/mmap_64.c @@ -16,11 +16,14 @@ void arch_pick_mmap_layout(struct mm_struct *mm) #endif mm->mmap_base = TASK_UNMAPPED_BASE; if (current->flags & PF_RANDOMIZE) { - /* Add 28bit randomness which is about 40bits of address space - because mmap base has to be page aligned. - or ~1/128 of the total user VM - (total user address space is 47bits) */ + /* + * Add 28bit randomness which is about 40bits of + * address space because mmap base has to be page + * aligned. or ~1/128 of the total user VM (total + * user address space is 47bits) + */ unsigned rnd = get_random_int() & 0xfffffff; + mm->mmap_base += ((unsigned long)rnd) << PAGE_SHIFT; } mm->get_unmapped_area = arch_get_unmapped_area; |