Re: [PATCH 1/8] powerpc/uaccess: Add unsafe_copy_from_user

[Christophe Leroy]

Le 16/10/2020 à 08:54, Christoph Hellwig a écrit :
> On Thu, Oct 15, 2020 at 10:01:52AM -0500, Christopher M. Riedl wrote:
> > Implement raw_copy_from_user_allowed() which assumes that userspace read
> > access is open. Use this new function to implement raw_copy_from_user().
> > Finally, wrap the new function to follow the usual "unsafe_" convention
> > of taking a label argument. The new raw_copy_from_user_allowed() calls
> > __copy_tofrom_user() internally, but this is still safe to call in user
> > access blocks formed with user_*_access_begin()/user_*_access_end()
> > since asm functions are not instrumented for tracing.
>
> Please also add a fallback unsafe_copy_from_user to linux/uaccess.h
> so this can be used as a generic API.

I guess this can be done in a separate patch independant of that series ?

Christophe