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ensure randomized huge page start address in 1GiB aligned

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daan 2019-10-17 12:35:35 -07:00
parent 454bc67338
commit 93b4281b82
1 changed files with 1 additions and 1 deletions
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src/os.c
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@ -886,7 +886,7 @@ int mi_reserve_huge_os_pages( size_t pages, double max_secs, size_t* pages_reser
uint8_t* start = (uint8_t*)((uintptr_t)32 << 40); // 32TiB virtual start address
#if (MI_SECURE>0 || MI_DEBUG==0) // security: randomize start of huge pages unless in debug mode
uintptr_t r = _mi_random_init((uintptr_t)&mi_reserve_huge_os_pages);
start = start + ((uintptr_t)MI_SEGMENT_SIZE * ((r>>17) & 0xFFFF)); // (randomly 0-64k)*4MiB == 0 to 256GiB
start = start + ((uintptr_t)MI_HUGE_OS_PAGE_SIZE * ((r>>17) & 0x3FF)); // (randomly 0-1024)*1GiB == 0 to 1TiB
#endif
// Allocate one page at the time but try to place them contiguously