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Adding support for SECCOMP_FILTER


I recently discovered that the kernel supports seccomp on Linux as support
was added in 2.6.27 [1].

I consequently added SH support to libseccomp [2], only to discover that we
are missing the SECCOMP_FILTER feature. Looking at the changes for PA-RISC [3]
and RISC-V [4], the necessary changes in the kernel seem to be rather modest.

Would anyone be willing to help me to implement SECCOMP_FILTER for SH? From what
I can see, we just need to implement the part to add syscall filtering.


> [1] https://github.com/torvalds/linux/commit/c4637d475170ca0d99973efd07df727012db6cd1
> [2] https://github.com/seccomp/libseccomp/pull/271
> [3] https://github.com/torvalds/linux/commit/910cd32e552ea09caa89cdbe328e468979b030dd
> [4] https://github.com/torvalds/linux/commit/5340627e3fe08030988bdda46dd86cd5d5fb7517

 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer - glaubitz@debian.org
`. `'   Freie Universitaet Berlin - glaubitz@physik.fu-berlin.de
  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913

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