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io_uring/rw: shrink io_iov_compat_buffer_select_prep

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Compat performance is not important and simplicity is more appreciated.
Let's not be smart about it and use simpler copy_from_user() instead of
access + __get_user pair.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/b334a3a5040efa424ded58e4d8a6ef2554324266.1740400452.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2025-02-24 12:42:22 +00:00 committed by Jens Axboe
parent 82d187d356
commit 52524b281d
1 changed files with 4 additions and 10 deletions
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14
io_uring/rw.c
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@ -48,18 +48,12 @@ static bool io_file_supports_nowait(struct io_kiocb *req, __poll_t mask)
static int io_iov_compat_buffer_select_prep(struct io_rw *rw)
{
struct compat_iovec __user *uiov;
compat_ssize_t clen;
struct compat_iovec __user *uiov = u64_to_user_ptr(rw->addr);
struct compat_iovec iov;
uiov = u64_to_user_ptr(rw->addr);
if (!access_ok(uiov, sizeof(*uiov)))
if (copy_from_user(&iov, uiov, sizeof(iov)))
return -EFAULT;
if (__get_user(clen, &uiov->iov_len))
return -EFAULT;
if (clen < 0)
return -EINVAL;
rw->len = clen;
rw->len = iov.iov_len;
return 0;
}