On 8/12/21 9:40 PM, Pavel Begunkov wrote:

For the bug description see 2/2. As mentioned there the current problems
is because of generic_write_checks(), but there was also a similar case
fixed in 5.12, which should have been triggerable by normal
write(2)/read(2) and others.

It may be better to enforce reexpands as a long term solution, but for
now this patchset is quickier and easier to backport.

We need to do something with this, hopefully soon.

v2: don't fail it has been justly fully reverted

Pavel Begunkov (2):
  iov_iter: mark truncated iters
  io_uring: don't retry with truncated iter

 fs/io_uring.c       | 16 ++++++++++++++++
 include/linux/uio.h |  5 ++++-
 2 files changed, 20 insertions(+), 1 deletion(-)

-- 
Pavel Begunkov