This is a note to let you know that I've just added the patch titled
io_uring: limit registration w/ SINGLE_ISSUER
to the 6.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
io_uring-limit-registration-w-single_issuer.patch
and it can be found in the queue-6.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From d7cce96c449e35bbfd41e830b341b95973891eed Mon Sep 17 00:00:00 2001
From: Pavel Begunkov <asml.silence@xxxxxxxxx>
Date: Tue, 27 Sep 2022 01:13:30 +0100
Subject: io_uring: limit registration w/ SINGLE_ISSUER
From: Pavel Begunkov <asml.silence@xxxxxxxxx>
commit d7cce96c449e35bbfd41e830b341b95973891eed upstream.
IORING_SETUP_SINGLE_ISSUER restricts what tasks can submit requests.
Extend it to registration as well, so non-owning task can't do
registrations. It's not necessary at the moment but might be useful in
the future.
Cc: <stable@xxxxxxxxxxxxxxx> # 6.0
Fixes: 97bbdc06a444 ("io_uring: add IORING_SETUP_SINGLE_ISSUER")
Signed-off-by: Pavel Begunkov <asml.silence@xxxxxxxxx>
Link: https://lore.kernel.org/r/f52a6a9c8a8990d4a831f73c0571e7406aac2bba.1664237592.git.asml.silence@xxxxxxxxx
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
io_uring/io_uring.c | 3 +++
1 file changed, 3 insertions(+)
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -3710,6 +3710,9 @@ static int __io_uring_register(struct io
if (WARN_ON_ONCE(percpu_ref_is_dying(&ctx->refs)))
return -ENXIO;
+ if (ctx->submitter_task && ctx->submitter_task != current)
+ return -EEXIST;
+
if (ctx->restricted) {
if (opcode >= IORING_REGISTER_LAST)
return -EINVAL;
Patches currently in stable-queue which might be from asml.silence@xxxxxxxxx are
queue-6.0/io_uring-correct-pinned_vm-accounting.patch
queue-6.0/io_uring-net-don-t-update-msg_name-if-not-provided.patch
queue-6.0/io_uring-rw-fix-unexpected-link-breakage.patch
queue-6.0/io_uring-net-don-t-lose-partial-send-recv-on-fail.patch
queue-6.0/io_uring-rw-don-t-lose-partial-io-result-on-fail.patch
queue-6.0/io_uring-net-fix-fast_iov-assignment-in-io_setup_async_msg.patch
queue-6.0/io_uring-net-don-t-lose-partial-send_zc-on-fail.patch
queue-6.0/io_uring-limit-registration-w-single_issuer.patch
queue-6.0/io_uring-add-custom-opcode-hooks-on-fail.patch
queue-6.0/io_uring-rw-don-t-lose-short-results-on-io_setup_async_rw.patch
queue-6.0/io_uring-af_unix-defer-registered-files-gc-to-io_uring-release.patch
