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LibC: Randomize malloc() block addresses on x86_64

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We have a lot of address space here, let's use it. :^)
This commit is contained in:
Andreas Kling 2021-07-25 17:53:15 +02:00
parent bdaaff70cb
commit 1fcb1ec367
1 changed files with 5 additions and 1 deletions
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6
Userland/Libraries/LibC/malloc.cpp
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@ -158,7 +158,11 @@ extern "C" {
static void* os_alloc(size_t size, const char* name)
{
auto* ptr = serenity_mmap(nullptr, size, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE | MAP_PURGEABLE, 0, 0, ChunkedBlock::block_size, name);
int flags = MAP_ANONYMOUS | MAP_PRIVATE | MAP_PURGEABLE;
#if ARCH(X86_64)
flags |= MAP_RANDOMIZED;
#endif
auto* ptr = serenity_mmap(nullptr, size, PROT_READ | PROT_WRITE, flags, 0, 0, ChunkedBlock::block_size, name);
VERIFY(ptr != MAP_FAILED);
return ptr;
}