linux-kernel - [PATCH v6 0/7] Add seccomp notifier ioctl that enables adding fds

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Message-Id: <20200706201720.3482959-1-keescook@chromium.org>
Date:   Mon,  6 Jul 2020 13:17:13 -0700
From:   Kees Cook <keescook@...omium.org>
To:     linux-kernel@...r.kernel.org
Cc:     Kees Cook <keescook@...omium.org>,
        Sargun Dhillon <sargun@...gun.me>,
        Christian Brauner <christian@...uner.io>,
        Tycho Andersen <tycho@...ho.ws>,
        David Laight <David.Laight@...LAB.COM>,
        Christoph Hellwig <hch@....de>,
        "David S. Miller" <davem@...emloft.net>,
        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: [PATCH v6 0/7] Add seccomp notifier ioctl that enables adding fds

Hello!

v6:
- fix missing fput()
- API name change: s/fd_install_received/receive_fd/
v5: https://lore.kernel.org/lkml/20200617220327.3731559-1-keescook@chromium.org/

This continues the 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 for-next/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 (5):
  net/scm: Regularize compat handling of scm_detach_fds()
  fs: Move __scm_install_fd() to __receive_fd()
  fs: Add receive_fd() wrapper for __receive_fd()
  pidfd: Replace open-coded partial receive_fd()
  fs: Expand __receive_fd() to accept existing fd

Sargun Dhillon (2):
  seccomp: Introduce addfd ioctl to seccomp user notifier
  selftests/seccomp: Test SECCOMP_IOCTL_NOTIF_ADDFD

 fs/file.c                                     |  67 +++++
 include/linux/file.h                          |  19 ++
 include/linux/net.h                           |   9 +
 include/uapi/linux/seccomp.h                  |  22 ++
 kernel/pid.c                                  |  13 +-
 kernel/seccomp.c                              | 172 ++++++++++++-
 net/compat.c                                  |  55 ++---
 net/core/scm.c                                |  50 +---
 tools/testing/selftests/seccomp/seccomp_bpf.c | 229 ++++++++++++++++++
 9 files changed, 554 insertions(+), 82 deletions(-)

-- 
2.25.1