On Wed, May 30, 2018 at 10:47:13PM +0200, Geert Uytterhoeven wrote:
> H Daniel,
>
> On Wed, May 30, 2018 at 4:34 PM, Daniel Thompson
> <daniel.thomp...@linaro.org> wrote:
> > On Tue, May 29, 2018 at 07:01:35PM -0700, Nick Desaulniers wrote:
> >> On Tue, May 29, 2018 at 12:57 AM, Arnd Bergmann <a...@arndb.de> wrote:
> >> > On Tue, May 29, 2018 at 7:57 AM, Nick Desaulniers
> >> > <nick.desaulni...@gmail.com> wrote:
> >> >> Fixes stringop-truncation and stringop-overflow warnings from gcc-8.
>
> >> Eric points out that this will leak kernel memory if size is less than
> >> sizeof src.
> >
> > Don't quite understand what this means (there's no allocation here, how
> > can there be a leak?) but the symbol completion certainly won't work if
> > we truncate the copy here.
>
> Not leak an is memory leak, but leak as in information leak of uninitialized
> data to userspace (if the buffer is ever copied to userspace).
I see... I saw "leak", I saw "memory" and was perhaps too quick to link
the two together.
The underlying bug is a buffer overflow (so a good catch and I look
forward to a v2) but, with or without Nick's change, I can't see a leak
in either sense of the word in the code that Arnd was commenting on[1].
Daniel.
[1] Clearly the undefined behaviour post-overflow *could* be a leak but
I stopped analyzing after the overflow.
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