[PATCH v4 00/11] Add seccomp notifier ioctl that enables adding fds

From: Kees Cook <keescook@chromium.org>
To: linux-kernel@vger.kernel.org
Cc: Kees Cook <keescook@chromium.org>,
	Sargun Dhillon <sargun@sargun.me>,
	Christian Brauner <christian@brauner.io>,
	"David S. Miller" <davem@davemloft.net>,
	Christoph Hellwig <hch@lst.de>, Tycho Andersen <tycho@tycho.ws>,
	Jakub Kicinski <kuba@kernel.org>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	Aleksa Sarai <cyphar@cyphar.com>,
	Matt Denton <mpdenton@google.com>, Jann Horn <jannh@google.com>,
	Chris Palmer <palmer@google.com>,
	Robert Sesek <rsesek@google.com>,
	Giuseppe Scrivano <gscrivan@redhat.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Andy Lutomirski <luto@amacapital.net>,
	Will Drewry <wad@chromium.org>, Shuah Khan <shuah@kernel.org>,
	netdev@vger.kernel.org, containers@lists.linux-foundation.org,
	linux-api@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	linux-kselftest@vger.kernel.org
Subject: [PATCH v4 00/11] Add seccomp notifier ioctl that enables adding fds
Date: Mon, 15 Jun 2020 20:25:13 -0700	[thread overview]
Message-ID: <20200616032524.460144-1-keescook@chromium.org> (raw)

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

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