| 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: io_uring: implement compat handling for IORING_REGISTER_IOWQ_AFF |
| |
| From: Eugene Syromiatnikov <esyr@redhat.com> |
| |
| commit 0f5e4b83b37a96e3643951588ed7176b9b187c0a upstream. |
| |
| 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: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| --- |
| fs/io_uring.c | 10 +++++++++- |
| 1 file changed, 9 insertions(+), 1 deletion(-) |
| |
| --- a/fs/io_uring.c |
| +++ b/fs/io_uring.c |
| @@ -10799,7 +10799,15 @@ static __cold int io_register_iowq_aff(s |
| 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; |
| } |
