linux-hardening - Re: [PATCH] thermal: core: Move initial num

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Date: Wed, 28 Feb 2024 08:41:07 +0000
From: Lukasz Luba <lukasz.luba@....com>
To: Kees Cook <keescook@...omium.org>, Nathan Chancellor <nathan@...nel.org>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>, rui.zhang@...el.com,
 gustavoars@...nel.org, morbo@...gle.com, justinstitt@...gle.com,
 stanislaw.gruszka@...ux.intel.com, linux-pm@...r.kernel.org,
 linux-hardening@...r.kernel.org, llvm@...ts.linux.dev,
 patches@...ts.linux.dev, Daniel Lezcano <daniel.lezcano@...aro.org>
Subject: Re: [PATCH] thermal: core: Move initial num_trips assignment before
 memcpy()

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)?

Regards,
Lukasz