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io_uring: implement compat handling for IORING_REGISTER_IOWQ_AFF

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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>
This commit is contained in:
Eugene Syromiatnikov 2022-04-06 13:55:33 +02:00 committed by Greg Kroah-Hartman
parent ae6cba337c
commit fe223dd2f1
1 changed files with 9 additions and 1 deletions
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10
fs/io_uring.c
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@ -10683,7 +10683,15 @@ static int io_register_iowq_aff(struct io_ring_ctx *ctx, void __user *arg,
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;
}