RE: [PATCH] drm/amd/pm: Replace all non-returning strlcpy with strscpy

[Deucher, Alexander]

[Public]

> -----Original Message-----
> From: Kees Cook <keescook@xxxxxxxxxxxx>
> Sent: Monday, May 22, 2023 4:16 PM
> To: Azeem Shaikh <azeemshaikh38@xxxxxxxxx>
> Cc: Quan, Evan <Evan.Quan@xxxxxxx>; linux-hardening@xxxxxxxxxxxxxxx;
> amd-gfx@xxxxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; Deucher,
> Alexander <Alexander.Deucher@xxxxxxx>; Koenig, Christian
> <Christian.Koenig@xxxxxxx>; Pan, Xinhui <Xinhui.Pan@xxxxxxx>; David
> Airlie <airlied@xxxxxxxxx>; Daniel Vetter <daniel@xxxxxxxx>; dri-
> devel@xxxxxxxxxxxxxxxxxxxxx
> Subject: Re: [PATCH] drm/amd/pm: Replace all non-returning strlcpy with
> strscpy
> 
> On Mon, May 22, 2023 at 03:52:45PM +0000, Azeem Shaikh wrote:
> > strlcpy() reads the entire source buffer first.
> > This read may exceed the destination size limit.
> > This is both inefficient and can lead to linear read overflows if a
> > source string is not NUL-terminated [1].
> > In an effort to remove strlcpy() completely [2], replace
> > strlcpy() here with strscpy().
> > No return values were used, so direct replacement is safe.
> >
> > [1]
> >
> https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy
> > [2] https://github.com/KSPP/linux/issues/89
> >
> > Signed-off-by: Azeem Shaikh <azeemshaikh38@xxxxxxxxx>
> 
> Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>
> 

Acked-by: Alex Deucher <alexander.deucher@xxxxxxx>

Ack to take this through whatever tree makes sense if you are trying to batch all of these up.  Otherwise, I can pick them up.

Alex