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[vm/ffi] Fix FFI callbacks on iOS 17
The new Secure Page Table Monitor in iOS on A15 and A16 does not allow `vm_remap`ping memory pages that are manually created. It only allows remapping pages which come directly from a signed binary. Manually copying the pages is supported in JIT mode. TEST=manually tested locally in a local-engine build Bug: https://github.com/flutter/flutter/issues/136980 Change-Id: I94d87f753a50648486f46fe728dd8358038971fe Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/332241 Reviewed-by: Slava Egorov <vegorov@google.com> Commit-Queue: Daco Harkes <dacoharkes@google.com>
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@ -54,7 +54,8 @@ bool VirtualMemory::DuplicateRX(VirtualMemory* target) {
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const intptr_t aligned_size = Utils::RoundUp(size(), PageSize());
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ASSERT_LESS_OR_EQUAL(aligned_size, target->size());
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#if defined(DART_HOST_OS_MACOS)
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#if defined(DART_HOST_OS_MACOS) && \
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(defined(DART_PRECOMPILED_RUNTIME) || defined(DART_PRECOMPILER))
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// Mac is special cased because iOS doesn't allow allocating new executable
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// memory, so the default approach would fail. We are allowed to make new
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// mappings of existing executable memory using vm_remap though, which is
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