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So far, handle_head/root_syscall limited to width of return values to int, thus 32-bit. This was waiting to break, and it did over the rework of the mayday syscall which now passed a pointer back. But also I/O syscalls were vulnerable on 64-bit platforms, at least in principle. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
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