I agree with Oleg. If there is an NT_SIGINFO note, it should contain exactly the siginfo_t layout and data that we otherwise expose to userland already. That is, it must match what PTRACE_GETSIGINFO reports, which (I think) also matches exactly what appears on the stack for a signal delivery. Note also that compat_binfmt_elf must deliver the 32-bit version of siginfo_t, i.e. as copy_siginfo_to_user32 does.
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