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b9f30c6f2a
When creating uninitialized storage for variables, we need to make sure that the alignment is correct. Fixes a KUBSAN failure when running kernels compiled with Clang. In `Syscalls/socket.cpp`, we can simply use local variables, as `sockaddr_un` is a POD type. Along with moving the `alignas` specifier to the correct member, `AK::Optional`'s internal buffer has been made non-zeroed by default. GCC emitted bogus uninitialized memory access warnings, so we now use `__builtin_launder` to tell the compiler that we know what we are doing. This might disable some optimizations, but judging by how GCC failed to notice that the memory's initialization is dependent on `m_has_value`, I'm not sure that's a bad thing. |
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