[scudo] Fix RingBuffer initialization.

Several map implementations require that map calls provide a page
aligned size.

Reviewed By: fmayer

Differential Revision: https://reviews.llvm.org/D141630

diff --git a/compiler-rt/lib/scudo/standalone/combined.h b/compiler-rt/lib/scudo/standalone/combined.h
index 8543315..ae2aafe 100644 (file)
--- a/compiler-rt/lib/scudo/standalone/combined.h
+++ b/compiler-rt/lib/scudo/standalone/combined.h
@@ -1500,7 +1500,8 @@ private:
       AllocationRingBufferSize = 1;
     MapPlatformData Data = {};
     RawRingBuffer = static_cast<char *>(
-        map(/*Addr=*/nullptr, ringBufferSizeInBytes(AllocationRingBufferSize),
+        map(/*Addr=*/nullptr,
+            roundUpTo(ringBufferSizeInBytes(AllocationRingBufferSize), getPageSizeCached()),
             "AllocatorRingBuffer", /*Flags=*/0, &Data));
     auto *RingBuffer = reinterpret_cast<AllocationRingBuffer *>(RawRingBuffer);
     RingBuffer->Size = AllocationRingBufferSize;