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Passes through prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, address)
qemu-user passes through prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, address) unmodified, but the third argument is an address to a BPF filter, causing an EFAULT. Now, the filter is architecture-specifc, so you can't just rewrite the addresses, so the safest bet is to just return an error here.
I guess you should just return EINVAL, but not sure. I'd really like something that can be identified, so seccomp errors can be ignored when it's not supported.
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