On Mon, Jun 27, 2022 at 9:40 AM Yangxi Xiang <xyangxi5@xxxxxxxxx> wrote:
>
> I also noticed that it was removed in commit 98b861a30431. I did see
> this problem in kernel 5.1 and this problem remains in
> architectures without selecting config GENERIC_STRNCPY_FROM_USER.
Which architectures do you mean? I don't see any architecture using
asm-generic/uaccess.h without setting GENERIC_STRNCPY_FROM_USER
before commit 98b861a30431 or the prior release.
Also, I think the implementation relied on strncpy() setting a zero pad
at the end of the string, so the ckeck would only be needed for a count
value that starts out negative? Is there another way this can actually
cause problems?
Arnd
