Re: [PATCH 2/4] seccomp: rework seccomp_prepare_filter().

From: Daniel Borkmann
Date: Wed Apr 29 2015 - 13:12:54 EST

On 04/29/2015 03:37 PM, Nicolas Schichan wrote:
- Try to use the classic BPF JIT via bpf_jit_compile().

- Use bpf_migrate_filter() from NET filter code instead of the double
bpf_convert_filter() followed by bpf_prog_select_runtime() if
classic bpf_jit_compile() did not succeed in producing native code.

Signed-off-by: Nicolas Schichan <nschichan@xxxxxxxxxx>

[ I had to look that one up manually, would be good if you keep
people in Cc, also netdev for BPF in general. ]

I see, you need that to make it available to the old bpf_jit_compile()
for probing on classic JITs. Actually, I really would prefer, if instead
of duplicating that code, you could export bpf_prepare_filter() and
pass seccomp_check_filter() as an argument to bpf_prepare_filter().

Otherwise, in case bpf_prepare_filter() changes, people will easily
forget to update seccomp related code, really.

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