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--- v8/src/flags/flags.cc.orig 2024-05-21 18:07:39 UTC
+++ v8/src/flags/flags.cc
@@ -15,6 +15,10 @@
#include <set>
#include <sstream>
+#if V8_OS_OPENBSD
+#include <sys/mman.h>
+#endif
+
#include "src/base/functional.h"
#include "src/base/lazy-instance.h"
#include "src/base/platform/platform.h"
@@ -34,7 +38,11 @@
namespace v8::internal {
// Define {v8_flags}, declared in flags.h.
+#if V8_OS_OPENBSD
+FlagValues v8_flags __attribute__((section(".openbsd.mutable")));
+#else
FlagValues v8_flags;
+#endif
// {v8_flags} needs to be aligned to a memory page, and the size needs to be a
// multiple of a page size. This is required for memory-protection of the memory
@@ -807,6 +815,10 @@ 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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