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Enable write permission before writing into CodeCache segment #18233

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merged 1 commit into from
Oct 5, 2023
Merged

Enable write permission before writing into CodeCache segment #18233

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2 changes: 2 additions & 0 deletions runtime/vm/segment.c
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Original file line number Diff line number Diff line change
Expand Up @@ -409,8 +409,10 @@ static J9MemorySegment * allocateVirtualMemorySegmentInListInternal(J9JavaVM *ja
/* For CodeCache segments the JIT will later write a TR::CodeCache structure pointer at the begining of the segment.
* Until then, make sure that a potential reader sees a NULL pointer.
*/
omrthread_jit_write_protect_disable();
*((UDATA**)allocatedBase) = NULL;
issueWriteBarrier();
omrthread_jit_write_protect_enable();
}
segment->baseAddress = allocatedBase;
segment->heapBase = allocatedBase;
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