Re: [RFC PATCH net-next 0/6] seccomp filter JIT

From: Nicolas Schichan
Date: Mon Apr 29 2013 - 08:18:20 EST

On 04/26/2013 02:31 PM, Xi Wang wrote:
Thanks for the pointer.

For the ARM part, looks like Nicolas's patch requires to implement two
wrappers for each arch:

void seccomp_jit_compile(struct seccomp_filter *fp);
void seccomp_jit_free(struct seccomp_filter *fp);

The implementation of these wrappers is almost identical to:

void bpf_jit_compile(struct sk_filter *fp);
void bpf_jit_free(struct sk_filter *fp);

While this patch uses a unified interface for both packet & seccomp filters.

bpf_func_t bpf_jit_compile(struct sock_filter *filter, unsigned int flen);
void bpf_jit_free(bpf_func_t bpf_func);

Shouldn't be hard to merge though.


I went for the solution I submitted because I wanted to avoid changes to the current bpf_jit_compile prototypes for all currently supported architectures (for most of which, I can only compile-test).

My solution also allows the seccomp jit code to be disabled while still allowing jit on socket filters (via a Kconfig option). This might be useful to some people.


Nicolas Schichan
Freebox SAS
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