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From:   David Abdurachmanov <david.abdurachmanov@gmail.com>
Date:   Thu, 6 Dec 2018 19:25:55 +0100
Message-ID: <CAEn-LTrhGAX2+V5r1kdBQw33M4Sre8P5e7wfRcwFruT5Y-WeXw@mail.gmail.com>
Subject: Re: [PATCH 1/2] riscv: add support for SECCOMP incl. filters
To:     Kees Cook <keescook@chromium.org>
Cc:     Palmer Dabbelt <palmer@sifive.com>, aou@eecs.berkeley.edu,
        luto@amacapital.net, Will Drewry <wad@chromium.org>,
        Green Hu <green.hu@gmail.com>, deanbo422@gmail.com,
        linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org
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On Thu, Dec 6, 2018 at 5:52 PM Kees Cook <keescook@chromium.org> wrote:
>
> On Thu, Dec 6, 2018 at 7:02 AM David Abdurachmanov
> <david.abdurachmanov@gmail.com> wrote:
> > The patch adds support for SECCOMP and SECCOMP_FILTER (BPF).
>
> Can you add support to tools/testing/selftests/seccomp/seccomp_bpf.c
> as well? That selftest finds a lot of weird corner-cases...

I hate it locally and will include in v2.

The results see fine (tested in QEMU).

TAP version 13
selftests: seccomp: seccomp_bpf
========================================
[==========] Running 64 tests from 1 test cases.
[ RUN      ] global.mode_strict_support
[       OK ] global.mode_strict_support
[ RUN      ] global.mode_strict_cannot_call_prctl
[       OK ] global.mode_strict_cannot_call_prctl
[ RUN      ] global.no_new_privs_support
[       OK ] global.no_new_privs_support
[ RUN      ] global.mode_filter_support
[       OK ] global.mode_filter_support
[ RUN      ] global.mode_filter_without_nnp
[       OK ] global.mode_filter_without_nnp
[ RUN      ] global.filter_size_limits
[       OK ] global.filter_size_limits
[ RUN      ] global.filter_chain_limits
[       OK ] global.filter_chain_limits
[ RUN      ] global.mode_filter_cannot_move_to_strict
[       OK ] global.mode_filter_cannot_move_to_strict
[ RUN      ] global.mode_filter_get_seccomp
[       OK ] global.mode_filter_get_seccomp
[ RUN      ] global.ALLOW_all
[       OK ] global.ALLOW_all
[ RUN      ] global.empty_prog
[       OK ] global.empty_prog
[ RUN      ] global.log_all
[       OK ] global.log_all
[ RUN      ] global.unknown_ret_is_kill_inside
[       OK ] global.unknown_ret_is_kill_inside
[ RUN      ] global.unknown_ret_is_kill_above_allow
[       OK ] global.unknown_ret_is_kill_above_allow
[ RUN      ] global.KILL_all
[       OK ] global.KILL_all
[ RUN      ] global.KILL_one
[       OK ] global.KILL_one
[ RUN      ] global.KILL_one_arg_one
[       OK ] global.KILL_one_arg_one
[ RUN      ] global.KILL_one_arg_six
[       OK ] global.KILL_one_arg_six
[ RUN      ] global.KILL_thread
[       OK ] global.KILL_thread
[ RUN      ] global.KILL_process
[       OK ] global.KILL_process
[ RUN      ] global.arg_out_of_range
[       OK ] global.arg_out_of_range
[ RUN      ] global.ERRNO_valid
[       OK ] global.ERRNO_valid
[ RUN      ] global.ERRNO_zero
[       OK ] global.ERRNO_zero
[ RUN      ] global.ERRNO_capped
[       OK ] global.ERRNO_capped
[ RUN      ] global.ERRNO_order
[       OK ] global.ERRNO_order
[ RUN      ] TRAP.dfl
[       OK ] TRAP.dfl
[ RUN      ] TRAP.ign
[       OK ] TRAP.ign
[ RUN      ] TRAP.handler
[       OK ] TRAP.handler
[ RUN      ] precedence.allow_ok
[       OK ] precedence.allow_ok
[ RUN      ] precedence.kill_is_highest
[       OK ] precedence.kill_is_highest
[ RUN      ] precedence.kill_is_highest_in_any_order
[       OK ] precedence.kill_is_highest_in_any_order
[ RUN      ] precedence.trap_is_second
[       OK ] precedence.trap_is_second
[ RUN      ] precedence.trap_is_second_in_any_order
[       OK ] precedence.trap_is_second_in_any_order
[ RUN      ] precedence.errno_is_third
[       OK ] precedence.errno_is_third
[ RUN      ] precedence.errno_is_third_in_any_order
[       OK ] precedence.errno_is_third_in_any_order
[ RUN      ] precedence.trace_is_fourth
[       OK ] precedence.trace_is_fourth
[ RUN      ] precedence.trace_is_fourth_in_any_order
[       OK ] precedence.trace_is_fourth_in_any_order
[ RUN      ] precedence.log_is_fifth
[       OK ] precedence.log_is_fifth
[ RUN      ] precedence.log_is_fifth_in_any_order
[       OK ] precedence.log_is_fifth_in_any_order
[ RUN      ] TRACE_poke.read_has_side_effects
[       OK ] TRACE_poke.read_has_side_effects
[ RUN      ] TRACE_poke.getpid_runs_normally
[       OK ] TRACE_poke.getpid_runs_normally
[ RUN      ] TRACE_syscall.ptrace_syscall_redirected
[       OK ] TRACE_syscall.ptrace_syscall_redirected
[ RUN      ] TRACE_syscall.ptrace_syscall_dropped
[       OK ] TRACE_syscall.ptrace_syscall_dropped
[ RUN      ] TRACE_syscall.syscall_allowed
[       OK ] TRACE_syscall.syscall_allowed
[ RUN      ] TRACE_syscall.syscall_redirected
[       OK ] TRACE_syscall.syscall_redirected
[ RUN      ] TRACE_syscall.syscall_dropped
[       OK ] TRACE_syscall.syscall_dropped
[ RUN      ] TRACE_syscall.skip_after_RET_TRACE
[       OK ] TRACE_syscall.skip_after_RET_TRACE
[ RUN      ] TRACE_syscall.kill_after_RET_TRACE
[       OK ] TRACE_syscall.kill_after_RET_TRACE
[ RUN      ] TRACE_syscall.skip_after_ptrace
[       OK ] TRACE_syscall.skip_after_ptrace
[ RUN      ] TRACE_syscall.kill_after_ptrace
[       OK ] TRACE_syscall.kill_after_ptrace
[ RUN      ] global.seccomp_syscall
[       OK ] global.seccomp_syscall
[ RUN      ] global.seccomp_syscall_mode_lock
[       OK ] global.seccomp_syscall_mode_lock
[ RUN      ] global.detect_seccomp_filter_flags
[       OK ] global.detect_seccomp_filter_flags
[ RUN      ] global.TSYNC_first
[       OK ] global.TSYNC_first
[ RUN      ] TSYNC.siblings_fail_prctl
[       OK ] TSYNC.siblings_fail_prctl
[ RUN      ] TSYNC.two_siblings_with_ancestor
[       OK ] TSYNC.two_siblings_with_ancestor
[ RUN      ] TSYNC.two_sibling_want_nnp
[       OK ] TSYNC.two_sibling_want_nnp
[ RUN      ] TSYNC.two_siblings_with_no_filter
[       OK ] TSYNC.two_siblings_with_no_filter
[ RUN      ] TSYNC.two_siblings_with_one_divergence
[       OK ] TSYNC.two_siblings_with_one_divergence
[ RUN      ] TSYNC.two_siblings_not_under_filter
[       OK ] TSYNC.two_siblings_not_under_filter
[ RUN      ] global.syscall_restart
[       OK ] global.syscall_restart
[ RUN      ] global.filter_flag_log
[       OK ] global.filter_flag_log
[ RUN      ] global.get_action_avail
[       OK ] global.get_action_avail
[ RUN      ] global.get_metadata
[       OK ] global.get_metadata
[==========] 64 / 64 tests passed.
[  PASSED  ]
ok 1..1 selftests: seccomp: seccomp_bpf [PASS]
selftests: seccomp: seccomp_benchmark
========================================
Calibrating reasonable sample size...
1544120467.383132905 - 1544120467.382814604 = 318301
1544120467.384111505 - 1544120467.383931405 = 180100
1544120467.385728706 - 1544120467.384510905 = 1217801
1544120467.386858006 - 1544120467.386096506 = 761500
1544120467.388563407 - 1544120467.387171006 = 1392401
1544120467.392465908 - 1544120467.390143107 = 2322801
1544120467.397988410 - 1544120467.393666109 = 4322301
1544120467.406494614 - 1544120467.398347511 = 8147103
1544120467.427372522 - 1544120467.406955414 = 20417108
1544120467.467600338 - 1544120467.427772222 = 39828116
1544120467.542484667 - 1544120467.467954738 = 74529929
1544120467.693806026 - 1544120467.543004867 = 150801159
1544120467.970921334 - 1544120467.694244026 = 276677308
1544120468.522149049 - 1544120467.971549534 = 550599515
1544120469.637696984 - 1544120468.522606749 = 1115090235
1544120471.829467338 - 1544120469.638147084 = 2191320254
1544120476.263601568 - 1544120471.829850239 = 4433751329
1544120485.135465027 - 1544120476.263980268 = 8871484759
Benchmarking 4194304 samples...
26.716000000 - 17.812000000 = 8904000000
getpid native: 2122 ns
46.548000000 - 26.716000000 = 19832000000
getpid RET_ALLOW: 4728 ns
Estimated seccomp overhead per syscall: 2606 ns
ok 1..2 selftests: seccomp: seccomp_benchmark [PASS]

>
> > diff --git a/arch/riscv/include/asm/thread_info.h b/arch/riscv/include/asm/thread_info.h
> > index 1c9cc8389928..1fd6e4130cab 100644
> > --- a/arch/riscv/include/asm/thread_info.h
> > +++ b/arch/riscv/include/asm/thread_info.h
> > @@ -81,6 +81,7 @@ struct thread_info {
> >  #define TIF_MEMDIE             5       /* is terminating due to OOM killer */
> >  #define TIF_SYSCALL_TRACEPOINT  6       /* syscall tracepoint instrumentation */
> >  #define TIF_SYSCALL_AUDIT      7       /* syscall auditing */
> > +#define TIF_SECCOMP                    8       /* syscall secure computing */
>
> Nit: extra tab needs to be removed.
>
> --
> Kees Cook