From c336e992cb1cb1db9ee608dfb30342ae781057ab Mon Sep 17 00:00:00 2001
From: Jens Axboe <axboe@kernel.dk>
Date: Fri, 3 Apr 2020 13:54:26 -0600
Subject: [PATCH] io_uring: remove bogus RLIMIT_NOFILE check in file
registration
We already checked this limit when the file was opened, and we keep it
open in the file table. Hence when we added unit_inflight to the count
we want to register, we're doubly accounting these files. This results
in -EMFILE for file registration, if we're at half the limit.
Cc: stable@vger.kernel.org # v5.1+
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
fs/io_uring.c | 7 -------
1 file changed, 7 deletions(-)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 2460c3333f700..ce76157c2f959 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -6216,13 +6216,6 @@ static int __io_sqe_files_scm(struct io_ring_ctx *ctx, int nr, int offset)
struct sk_buff *skb;
int i, nr_files;
- if (!capable(CAP_SYS_RESOURCE) && !capable(CAP_SYS_ADMIN)) {
- unsigned long inflight = ctx->user->unix_inflight + nr;
-
- if (inflight > task_rlimit(current, RLIMIT_NOFILE))
- return -EMFILE;
- }
-
fpl = kzalloc(sizeof(*fpl), GFP_KERNEL);
if (!fpl)
return -ENOMEM;
--
2.30.2