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authorPavel Begunkov <asml.silence@gmail.com>2022-09-27 03:13:30 +0300
committerJens Axboe <axboe@kernel.dk>2022-10-07 21:25:30 +0300
commitd7cce96c449e35bbfd41e830b341b95973891eed (patch)
tree8e95e41c02cad381a5835910d1492a3bad221339 /io_uring
parent4add705e4eebbdd919741de0548d7029c8c92b68 (diff)
downloadlinux-d7cce96c449e35bbfd41e830b341b95973891eed.tar.xz
io_uring: limit registration w/ SINGLE_ISSUER
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@vger.kernel.org> # 6.0 Fixes: 97bbdc06a444 ("io_uring: add IORING_SETUP_SINGLE_ISSUER") Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Link: https://lore.kernel.org/r/f52a6a9c8a8990d4a831f73c0571e7406aac2bba.1664237592.git.asml.silence@gmail.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'io_uring')
-rw-r--r--io_uring/io_uring.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index fe6ef64c873e..63f6ce5e5355 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -3890,6 +3890,9 @@ static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode,
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;