From 0f5e4b83b37a96e3643951588ed7176b9b187c0a Mon Sep 17 00:00:00 2001
From: Eugene Syromiatnikov <esyr@redhat.com>
Date: Wed, 6 Apr 2022 13:55:33 +0200
Subject: [PATCH] io_uring: implement compat handling for
IORING_REGISTER_IOWQ_AFF
Git-commit: 0f5e4b83b37a96e3643951588ed7176b9b187c0a
Patch-mainline: v5.18-rc2
References: bsc#1205205
Similarly to the way it is done im mbind syscall.
Cc: stable@vger.kernel.org # 5.14
Fixes: fe76421d1da1dcdb ("io_uring: allow user configurable IO thread CPU affinity")
Signed-off-by: Eugene Syromiatnikov <esyr@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Gabriel Krisman Bertazi <krisman@suse.de>
---
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 60d6ac21519d..a88eca3e0902 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -11472,7 +11472,15 @@ 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;
}
--
2.35.3