netdev - Re: [PATCH v4 00/11] Add seccomp notifier ioctl that enables adding fds

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Date:   Thu, 18 Jun 2020 22:16:45 +0000
From:   Sargun Dhillon <sargun@...gun.me>
To:     Kees Cook <keescook@...omium.org>
Cc:     linux-kernel@...r.kernel.org,
        Christian Brauner <christian@...uner.io>,
        "David S. Miller" <davem@...emloft.net>,
        Christoph Hellwig <hch@....de>,
        Tycho Andersen <tycho@...ho.ws>,
        Jakub Kicinski <kuba@...nel.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Aleksa Sarai <cyphar@...har.com>,
        Matt Denton <mpdenton@...gle.com>,
        Jann Horn <jannh@...gle.com>, Chris Palmer <palmer@...gle.com>,
        Robert Sesek <rsesek@...gle.com>,
        Giuseppe Scrivano <gscrivan@...hat.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andy Lutomirski <luto@...capital.net>,
        Will Drewry <wad@...omium.org>, Shuah Khan <shuah@...nel.org>,
        netdev@...r.kernel.org, containers@...ts.linux-foundation.org,
        linux-api@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v4 00/11] Add seccomp notifier ioctl that enables adding
 fds

On Mon, Jun 15, 2020 at 08:25:13PM -0700, Kees Cook wrote:
> Hello!
> 
> This is a bit of thread-merge between [1] and [2]. tl;dr: add a way for
> a seccomp user_notif process manager to inject files into the managed
> process in order to handle emulation of various fd-returning syscalls
> across security boundaries. Containers folks and Chrome are in need
> of the feature, and investigating this solution uncovered (and fixed)
> implementation issues with existing file sending routines.
> 
> I intend to carry this in the seccomp tree, unless someone has objections.
> :) Please review and test!
> 
> -Kees
> 
> [1] https://lore.kernel.org/lkml/20200603011044.7972-1-sargun@sargun.me/
> [2] https://lore.kernel.org/lkml/20200610045214.1175600-1-keescook@chromium.org/
> 
> Kees Cook (9):
>   net/scm: Regularize compat handling of scm_detach_fds()
>   fs: Move __scm_install_fd() to __fd_install_received()
>   fs: Add fd_install_received() wrapper for __fd_install_received()
>   pidfd: Replace open-coded partial fd_install_received()
>   fs: Expand __fd_install_received() to accept fd
>   selftests/seccomp: Make kcmp() less required
>   selftests/seccomp: Rename user_trap_syscall() to user_notif_syscall()
>   seccomp: Switch addfd to Extensible Argument ioctl
>   seccomp: Fix ioctl number for SECCOMP_IOCTL_NOTIF_ID_VALID
> 
This looks much cleaner than the original patchset. Thanks.

Reviewed-by: Sargun Dhillon <sargun@...gun.me>

on the pidfd, change fs* changes.

> Sargun Dhillon (2):
>   seccomp: Introduce addfd ioctl to seccomp user notifier
>   selftests/seccomp: Test SECCOMP_IOCTL_NOTIF_ADDFD
> 
>  fs/file.c                                     |  65 ++++
>  include/linux/file.h                          |  16 +
>  include/uapi/linux/seccomp.h                  |  25 +-
>  kernel/pid.c                                  |  11 +-
>  kernel/seccomp.c                              | 181 ++++++++-
>  net/compat.c                                  |  55 ++-
>  net/core/scm.c                                |  50 +--
>  tools/testing/selftests/seccomp/seccomp_bpf.c | 350 +++++++++++++++---
>  8 files changed, 618 insertions(+), 135 deletions(-)
> 
> -- 
> 2.25.1
>