On Mon, Sep 25, 2017 at 7:41 AM, David Laight [off-list ref] wrote:

From: Arnd Bergmann

quoted

Sent: 22 September 2017 22:29

...

quoted

It seems that this is triggered in part by using strlcpy(), which the
compiler doesn't recognize as copying at most 'len' bytes, since strlcpy
is not part of the C standard.

Neither is strncpy().

It'll almost certainly be a marker in a header file somewhere,
so it should be possibly to teach it about other functions.

I'm currently travelling and haven't investigated in detail, but from
taking a closer look here, I found that the hardened 'strlcpy()'
in include/linux/string.h triggers it. There is also a hardened
(much shorted) 'strncpy()' that doesn't trigger it in the same file,
and having only the extern declaration of strncpy also doesn't.

        Arnd