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    SubjectRe: Using ftrace/perf as a basis for generic seccomp
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    On Wed, 2011-02-02 at 13:26 +0100, Ingo Molnar wrote:
    > * Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> wrote:
    >
    > > Hi Eric,
    > >
    > > (2011/02/01 23:58), Eric Paris wrote:
    > > > On Wed, Jan 12, 2011 at 4:28 PM, Eric Paris <eparis@redhat.com> wrote:
    > > >> Some time ago Adam posted a patch to allow for a generic seccomp
    > > >> implementation (unlike the current seccomp where your choice is all
    > > >> syscalls or only read, write, sigreturn, and exit) which got little
    > > >> traction and it was suggested he instead do the same thing somehow using
    > > >> the tracing code:
    > > >> http://thread.gmane.org/gmane.linux.kernel/833556
    > >
    > > Hm, interesting idea :)
    > > But why would you like to use tracing code? just for hooking?
    >
    > What I suggested before was to reuse the scripting engine and the tracepoints.
    >
    > I.e. the "seccomp restrictions" can be implemented via a filter expression - and the
    > scripting engine could be generalized so that such 'sandboxing' code can make use of
    > it.
    >
    > For example, if you want to restrict a process to only allow open() syscalls to fd 4
    > (a very restrictive sandbox), it could be done via this filter expression:
    >
    > 'fd == 4'
    >
    > etc. Note that obviously the scripting engine needs to be abstracted out somewhat -
    > but this is the basic idea, to reuse the callbacks and reuse the scripting engine
    > for runtime filtering of syscall parameters.

    Any pointers on what is involved in this abstraction? I can work out
    the details, but I don't know the big picture well enough to even start
    to move forwards.....

    -Eric



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