Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 5.17 278/343] io_uring: implement compat handling for IORING_REGISTER_IOWQ_AFF | Date | Tue, 12 Apr 2022 08:31:36 +0200 |
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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 @@ -10860,7 +10860,15 @@ 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; }
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