Fix page permissions on upcall trampolines.

rschatz · rschatz · commit 328f7f9de7dc · 2025-09-03T13:48:49.000+02:00
diff --git a/substratevm/src/com.oracle.svm.core.foreign/src/com/oracle/svm/core/foreign/TrampolineSet.java b/substratevm/src/com.oracle.svm.core.foreign/src/com/oracle/svm/core/foreign/TrampolineSet.java
@@ -159,7 +159,7 @@ private Pointer prepareTrampolines(PinnedObject mhsArray, PinnedObject stubsArra
             VMError.guarantee(it.belowOrEqual(end), "Not enough memory was allocated to hold trampolines");
         }
 
-        VMError.guarantee(VirtualMemoryProvider.get().protect(page, pageSize, VirtualMemoryProvider.Access.EXECUTE) == 0,
+        VMError.guarantee(VirtualMemoryProvider.get().protect(page, pageSize, VirtualMemoryProvider.Access.READ | VirtualMemoryProvider.Access.EXECUTE) == 0,
                         "Error when making the trampoline allocation executable");
 
         /*

Original file line number	Diff line number	Diff line change
`@@ -159,7 +159,7 @@ private Pointer prepareTrampolines(PinnedObject mhsArray, PinnedObject stubsArra`
`159`	`159`	`VMError.guarantee(it.belowOrEqual(end), "Not enough memory was allocated to hold trampolines");`
`160`	`160`	`}`
`161`	`161`
`162`		`- VMError.guarantee(VirtualMemoryProvider.get().protect(page, pageSize, VirtualMemoryProvider.Access.EXECUTE) == 0,`
	`162`	`+ VMError.guarantee(VirtualMemoryProvider.get().protect(page, pageSize, VirtualMemoryProvider.Access.READ \| VirtualMemoryProvider.Access.EXECUTE) == 0,`
`163`	`163`	`"Error when making the trampoline allocation executable");`
`164`	`164`
`165`	`165`	`/*`