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Merge pull request #13791 from achurch/linux-mmap-commit-fix

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Linux: Properly avoid committing address space for large mmap().
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Henrik Rydgård authored and GitHub committed 2020-12-19 14:54:04 +01:00
2 parents fd1b186e93 163ed5b5f7
commit 0da96ff119
1 file changed
+1 -1
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Common/MemArenaPosix.cpp
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@@ -108,7 +108,7 @@ u8* MemArena::Find4GBBase() {
// aligned to 4GB for the movk trick. We can ensure that we get an aligned 4GB
// address by grabbing 8GB and aligning the pointer.
const uint64_t EIGHT_GIGS = 0x200000000ULL;
void *base = mmap(0, EIGHT_GIGS, PROT_READ | PROT_WRITE, MAP_ANON | MAP_SHARED | MAP_NORESERVE, -1, 0);
void *base = mmap(0, EIGHT_GIGS, PROT_NONE, MAP_ANON | MAP_PRIVATE | MAP_NORESERVE, -1, 0);
if (base && base != MAP_FAILED) {
INFO_LOG(MEMMAP, "base: %p", base);
uint64_t aligned_base = ((uint64_t)base + 0xFFFFFFFF) & ~0xFFFFFFFFULL;