Date: Thu, 6 Aug 2020 09:49:29 +0200 From: Stefano Garzarella <sgarzare@...hat.com> To: Jens Axboe <axboe@...nel.dk> Cc: io-uring@...r.kernel.org, Alexander Viro <viro@...iv.linux.org.uk>, Kees Cook <keescook@...omium.org>, Jeff Moyer <jmoyer@...hat.com>, Kernel Hardening <kernel-hardening@...ts.openwall.com>, linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, Aleksa Sarai <asarai@...e.de>, Sargun Dhillon <sargun@...gun.me>, Stefan Hajnoczi <stefanha@...hat.com>, Christian Brauner <christian.brauner@...ntu.com>, Jann Horn <jannh@...gle.com> Subject: Re: [PATCH v3 0/3] io_uring: add restrictions to support untrusted applications and guests Gentle ping. I'll rebase on master, but if there are any things that I can improve, I'll be happy to do. Thanks, Stefano On Tue, Jul 28, 2020 at 06:00:58PM +0200, Stefano Garzarella wrote: > v3: > - added IORING_RESTRICTION_SQE_FLAGS_ALLOWED and > IORING_RESTRICTION_SQE_FLAGS_REQUIRED > - removed IORING_RESTRICTION_FIXED_FILES_ONLY opcode > - enabled restrictions only when the rings start > > RFC v2: https://email@example.com > > RFC v1: https://firstname.lastname@example.org > > Following the proposal that I send about restrictions , 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 > >  https://lore.kernel.org/io-uring/20200609142406.upuwpfmgqjeji4lc@steredhat/ > > 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 | 167 ++++++++++++++++++++++++++++++++-- > include/uapi/linux/io_uring.h | 60 +++++++++--- > 2 files changed, 207 insertions(+), 20 deletions(-) > > -- > 2.26.2 >
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