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From: Christian Brauner <christian.brauner@ubuntu.com>
To: keescook@chromium.org, luto@amacapital.net
Cc: jannh@google.com, wad@chromium.org, shuah@kernel.org,
	ast@kernel.org, daniel@iogearbox.net, kafai@fb.com,
	songliubraving@fb.com, yhs@fb.com, linux-kernel@vger.kernel.org,
	linux-kselftest@vger.kernel.org, netdev@vger.kernel.org,
	bpf@vger.kernel.org,
	Christian Brauner <christian.brauner@ubuntu.com>
Subject: [PATCH v2 0/3] seccomp: continue syscall from notifier
Date: Fri, 20 Sep 2019 10:30:04 +0200	[thread overview]
Message-ID: <20190920083007.11475-1-christian.brauner@ubuntu.com> (raw)

Hey everyone,

/* v2 */
This is the patchset coming out of the KSummit session Kees and I gave
in Lisbon last week (cf. [3] which also contains slides with more
details on related things such as deep argument inspection).
The simple idea is to extend the seccomp notifier to allow for the
continuation of a syscall. The rationale for this can be found in the
commit message to [1]. For the curious there is more detail in [2].
This patchset would unblock supervising an extended set of syscalls such
as mount() where a privileged process is supervising the syscalls of a
lesser privileged process and emulates the syscall for the latter in
userspace.
For more comments on security see [1] and the comments in
include/uapi/linux/seccomp.h added by this patchset.

Kees, if you prefer a pr the series can be pulled from:
git@gitolite.kernel.org:pub/scm/linux/kernel/git/brauner/linux tags/seccomp-notify-syscall-continue-v5.5

For anyone who wants to play with this it's sitting in:
https://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux.git/log/?h=seccomp_syscall_continue

/* v1 */
Link: https://lore.kernel.org/r/20190919095903.19370-1-christian.brauner@ubuntu.com
- Kees Cook <keescook@chromium.org>:
  - dropped patch because it is already present in linux-next
    [PATCH 2/4] seccomp: add two missing ptrace ifdefines
    Link: https://lore.kernel.org/r/20190918084833.9369-3-christian.brauner@ubuntu.com

/* v0 */
Link: https://lore.kernel.org/r/20190918084833.9369-1-christian.brauner@ubuntu.com

Thanks!
Christian

*** BLURB HERE ***

Christian Brauner (3):
  seccomp: add SECCOMP_USER_NOTIF_FLAG_CONTINUE
  seccomp: avoid overflow in implicit constant conversion
  seccomp: test SECCOMP_USER_NOTIF_FLAG_CONTINUE

 include/uapi/linux/seccomp.h                  |  28 +++++
 kernel/seccomp.c                              |  28 ++++-
 tools/testing/selftests/seccomp/seccomp_bpf.c | 110 +++++++++++++++++-
 3 files changed, 159 insertions(+), 7 deletions(-)

-- 
2.23.0


             reply	other threads:[~2019-09-20  8:31 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-20  8:30 Christian Brauner [this message]
2019-09-20  8:30 ` [PATCH v2 1/3] seccomp: add SECCOMP_USER_NOTIF_FLAG_CONTINUE Christian Brauner
2019-10-10 21:45   ` Kees Cook
2019-10-11  9:46     ` Christian Brauner
2019-09-20  8:30 ` [PATCH v2 2/3] seccomp: avoid overflow in implicit constant conversion Christian Brauner
2019-09-20  8:47   ` Tycho Andersen
2019-09-20  8:30 ` [PATCH v2 3/3] seccomp: test SECCOMP_USER_NOTIF_FLAG_CONTINUE Christian Brauner

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