linux-kernel - [PATCH] io_uring: implement compat handling for IORING_REGISTER_IOWQ

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Date:   Wed, 6 Apr 2022 13:55:33 +0200
From:   Eugene Syromiatnikov <esyr@...hat.com>
To:     Jens Axboe <axboe@...nel.dk>,
        Pavel Begunkov <asml.silence@...il.com>
Cc:     io-uring@...r.kernel.org, linux-kernel@...r.kernel.org,
        Artem Savkov <asavkov@...hat.com>
Subject: [PATCH] io_uring: implement compat handling for
 IORING_REGISTER_IOWQ_AFF

Similarly to the way it is done im mbind syscall.

Cc: stable@...r.kernel.org # 5.14
Fixes: fe76421d1da1dcdb ("io_uring: allow user configurable IO thread CPU affinity")
Signed-off-by: Eugene Syromiatnikov <esyr@...hat.com>
---
 fs/io_uring.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index de9c9de..83e194f 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -10803,7 +10803,15 @@ static __cold int io_register_iowq_aff(struct io_ring_ctx *ctx,
 	if (len > cpumask_size())
 		len = cpumask_size();
 
-	if (copy_from_user(new_mask, arg, len)) {
+	if (in_compat_syscall()) {
+		ret = compat_get_bitmap(cpumask_bits(new_mask),
+					(const compat_ulong_t __user *)arg,
+					len * 8 /* CHAR_BIT */);
+	} else {
+		ret = copy_from_user(new_mask, arg, len);
+	}
+
+	if (ret) {
 		free_cpumask_var(new_mask);
 		return -EFAULT;
 	}
-- 
2.1.4