Date: Thu, 27 Aug 2020 21:01:12 -0600 From: Jens Axboe <axboe@...nel.dk> To: Stefano Garzarella <sgarzare@...hat.com> Cc: Kernel Hardening <kernel-hardening@...ts.openwall.com>, Christian Brauner <christian.brauner@...ntu.com>, linux-fsdevel@...r.kernel.org, io-uring@...r.kernel.org, Alexander Viro <viro@...iv.linux.org.uk>, Stefan Hajnoczi <stefanha@...hat.com>, Jann Horn <jannh@...gle.com>, Jeff Moyer <jmoyer@...hat.com>, Aleksa Sarai <asarai@...e.de>, Sargun Dhillon <sargun@...gun.me>, linux-kernel@...r.kernel.org, Kees Cook <keescook@...omium.org> Subject: Re: [PATCH v6 0/3] io_uring: add restrictions to support untrusted applications and guests On 8/27/20 8:58 AM, Stefano Garzarella wrote: > v6: > - moved restriction checks in a function [Jens] > - changed ret value handling in io_register_restrictions() [Jens] > > v5: https://email@example.com/ > v4: https://firstname.lastname@example.org/ > v3: https://email@example.com/ > RFC v2: https://firstname.lastname@example.org > RFC v1: https://email@example.com > > 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. Applied, thanks. -- Jens Axboe
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