Messages in this thread | | | Date | Mon, 26 Oct 2015 16:07:01 +0900 | Subject | Re: [PATCH v8] seccomp, ptrace: add support for dumping seccomp filters | From | Kees Cook <> |
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On Mon, Oct 26, 2015 at 3:46 PM, Kees Cook <keescook@chromium.org> wrote: > On Mon, Oct 26, 2015 at 12:39 AM, Oleg Nesterov <oleg@redhat.com> wrote: >> On 10/21, Tycho Andersen wrote: >>> >>> > And this leads to another question... If we expect that this interface >>> > can change later, then perhaps PTRACE_SECCOMP_GET_FILTER should also >>> > dump some header before copy_to_user(fprog->filter) ? Say, just >>> > "unsigned long version" == 0 for now. So that we can avoid >>> > PTRACE_SECCOMP_GET_FILTER_V2 in future. >>> >>> So this is interesting. Like Kees mentioned, the bulk of the work >>> would be done by the bpf syscall. We'd still need some way to get >>> access to the fd itself, which we could (ab)use >>> PTRACE_SECCOMP_GET_FILTER for, by returning the fd + BPF_MAXINSNS (so >>> that it doesn't conflict with length) or something like that. Or add a >>> _V2 as you say. If there is some change we can make to have a nicer >>> interface than fd + BPF_MAXINSNS to future proof, I'm fine with making >>> it. >> >> Can't comment, this is up to you/Kees ;) >> >> So, just in case, let me repeat I am fine with this patch. > > Cool, thanks. I'll get this into my tree after kernel summit. Thanks > for suffering through all this Tycho!
Actually, since this depends on changes in net, could this get pulled in from that direction?
Acked-by: Kees Cook <keescook@chromium.org>
-Kees
-- Kees Cook Chrome OS Security
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