From: Nathan Chancellor <nathan@kernel.org>
To: Lukasz Luba <lukasz.luba@arm.com>
Cc: Kees Cook <keescook@chromium.org>,
"Rafael J. Wysocki" <rafael@kernel.org>,
rui.zhang@intel.com, gustavoars@kernel.org, morbo@google.com,
justinstitt@google.com, stanislaw.gruszka@linux.intel.com,
linux-pm@vger.kernel.org, linux-hardening@vger.kernel.org,
llvm@lists.linux.dev, patches@lists.linux.dev,
Daniel Lezcano <daniel.lezcano@linaro.org>
Subject: Re: [PATCH] thermal: core: Move initial num_trips assignment before memcpy()
Date: Wed, 28 Feb 2024 09:56:51 -0700 [thread overview]
Message-ID: <20240228165651.GA2158263@dev-arch.thelio-3990X> (raw)
In-Reply-To: <3ed4ad69-1229-4834-95b7-9397364ea401@arm.com>
On Wed, Feb 28, 2024 at 08:41:07AM +0000, Lukasz Luba wrote:
> Hi Nathan and Kees,
>
> On 2/27/24 17:00, Kees Cook wrote:
> > On Tue, Feb 27, 2024 at 05:47:44PM +0100, Daniel Lezcano wrote:
> > > Ok my misunderstanding was I thought sizeof() was calling _bdos under the
> > > hood, so when calling sizeof(flex_array), it was returning the computed size
> > > inferring from the __counted_by field.
> >
> > Yeah, sizeof() has a very limited scope. __builtin_object_size() has
> > more flexibility (via the 2nd argument, "type"), but it was still
> > compile-time only. __builtin_dynamic_object_size() was added to bring
> > runtime evaluations into the mix (initially to support the alloc_size
> > attribute, and now includes the counted_by attribute too).
> >
>
> Thanks for your earlier emails explaining these stuff.
> Do you have maybe some presentation about those features
> for the kernel (ideally w/ a video from some conference)?
I think Kees's 2022 and 2023 talks at LPC are a good place to start:
https://youtu.be/tQwv79i02ks?si=Nj9hpvmQwPB4K3Y4&t=452
https://youtu.be/OEFFqhP5sts?si=u6RnOP641S8FkouD&t=614
https://outflux.net/slides/2022/lpc/features.pdf
https://outflux.net/slides/2023/lpc/features.pdf
Cheers,
Nathan
next prev parent reply other threads:[~2024-02-28 16:56 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-27 0:54 [PATCH] thermal: core: Move initial num_trips assignment before memcpy() Nathan Chancellor
2024-02-27 2:08 ` Kees Cook
2024-02-27 11:07 ` Rafael J. Wysocki
2024-02-27 9:58 ` Lukasz Luba
2024-02-27 10:14 ` Daniel Lezcano
2024-02-27 11:09 ` Rafael J. Wysocki
2024-02-27 15:37 ` Daniel Lezcano
2024-02-27 16:26 ` Kees Cook
2024-02-27 16:47 ` Daniel Lezcano
2024-02-27 17:00 ` Kees Cook
2024-02-28 8:41 ` Lukasz Luba
2024-02-28 16:56 ` Nathan Chancellor [this message]
2024-02-28 17:48 ` Kees Cook
2024-02-29 7:42 ` Lukasz Luba
2024-02-27 16:26 ` Nathan Chancellor
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