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--- v8/src/flags/flags.cc.orig 2025-09-11 13:19:19 UTC
+++ v8/src/flags/flags.cc
@@ -16,6 +16,10 @@
#include <set>
#include <sstream>
+#if V8_OS_OPENBSD
+#include <sys/mman.h>
+#endif
+
#include "src/base/fpu.h"
#include "src/base/hashing.h"
#include "src/base/lazy-instance.h"
@@ -827,6 +831,10 @@ void FlagList::FreezeFlags() {
// Note that for string flags we only protect the pointer itself, but not the
// string storage. TODO(12887): Fix this.
base::OS::SetDataReadOnly(&v8_flags, sizeof(v8_flags));
+#if V8_OS_OPENBSD
+ if (mimmutable(&v8_flags, sizeof(v8_flags)) == -1)
+ FATAL("unable to set immutability of v8_flags");
+#endif
}
// static
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