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* [PATCH v4 0/3] io_uring: add restrictions to support untrusted applications and guests
@ 2020-08-13 15:32 Stefano Garzarella
  2020-08-13 15:32 ` [PATCH v4 1/3] io_uring: use an enumeration for io_uring_register(2) opcodes Stefano Garzarella
                   ` (3 more replies)
  0 siblings, 4 replies; 17+ messages in thread
From: Stefano Garzarella @ 2020-08-13 15:32 UTC (permalink / raw)
  To: Jens Axboe
  Cc: Christian Brauner, Jann Horn, Jeff Moyer, linux-fsdevel,
	Sargun Dhillon, Kees Cook, Alexander Viro, Kernel Hardening,
	Stefan Hajnoczi, linux-kernel, Aleksa Sarai, io-uring

v4:
 - rebased on top of io_uring-5.9
 - fixed io_uring_enter() exit path when ring is disabled

v3: https://lore.kernel.org/io-uring/[email protected]=
om/
RFC v2: https://lore.kernel.org/io-uring/20200716124833.93667-1-sgarzare@redh=
at.com
RFC v1: https://lore.kernel.org/io-uring/20200710141945.129329-1-sgarzare@red=
hat.com

Following the proposal that I send about restrictions [1], I wrote this series
to add restrictions in io_uring.

I also wrote helpers in liburing and a test case (test/register-restrictions.=
c)
available in this repository:
https://github.com/stefano-garzarella/liburing (branch: io_uring_restrictions)

Just to recap the proposal, the idea is to add some restrictions to the
operations (sqe opcode and flags, register opcode) to safely allow untrusted
applications or guests to use io_uring queues.

The first patch changes io_uring_register(2) opcodes into an enumeration to
keep track of the last opcode available.

The second patch adds IOURING_REGISTER_RESTRICTIONS opcode and the code to
handle restrictions.

The third patch adds IORING_SETUP_R_DISABLED flag to start the rings disabled,
allowing the user to register restrictions, buffers, files, before to start
processing SQEs.

Comments and suggestions are very welcome.

Thank you in advance,
Stefano

[1] https://lore.kernel.org/io-uring/20200609142406.upuwpfmgqjeji4lc@steredha=
t/

Stefano Garzarella (3):
  io_uring: use an enumeration for io_uring_register(2) opcodes
  io_uring: add IOURING_REGISTER_RESTRICTIONS opcode
  io_uring: allow disabling rings during the creation

 fs/io_uring.c                 | 160 ++++++++++++++++++++++++++++++++--
 include/uapi/linux/io_uring.h |  60 ++++++++++---
 2 files changed, 203 insertions(+), 17 deletions(-)

--=20
2.26.2


^ permalink raw reply	[flat|nested] 17+ messages in thread

end of thread, other threads:[~2020-08-27 15:06 UTC | newest]

Thread overview: 17+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2020-08-13 15:32 [PATCH v4 0/3] io_uring: add restrictions to support untrusted applications and guests Stefano Garzarella
2020-08-13 15:32 ` [PATCH v4 1/3] io_uring: use an enumeration for io_uring_register(2) opcodes Stefano Garzarella
2020-08-26 19:40   ` Kees Cook
2020-08-26 19:43   ` Kees Cook
2020-08-26 19:52     ` Andreas Dilger
2020-08-27  7:11       ` Stefano Garzarella
2020-08-13 15:32 ` [PATCH v4 2/3] io_uring: add IOURING_REGISTER_RESTRICTIONS opcode Stefano Garzarella
2020-08-26 19:46   ` Kees Cook
2020-08-27  7:12     ` Stefano Garzarella
2020-08-13 15:32 ` [PATCH v4 3/3] io_uring: allow disabling rings during the creation Stefano Garzarella
2020-08-26 19:50   ` Kees Cook
2020-08-27  7:18     ` Stefano Garzarella
2020-08-27 15:04       ` Kees Cook
2020-08-25 15:20 ` [PATCH v4 0/3] io_uring: add restrictions to support untrusted applications and guests Stefano Garzarella
2020-08-26 16:47   ` Jens Axboe
2020-08-26 19:40     ` Kees Cook
2020-08-27  7:24       ` Stefano Garzarella

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