linux-hardening - Re: [PATCH AUTOSEL 6.1 10/12] enic: Avoid false positive under FORTIFY

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Message-ID: <Zfg4ppen73m7XCNf@sashalap>
Date: Mon, 18 Mar 2024 08:50:46 -0400
From: Sasha Levin <sashal@...nel.org>
To: Pavel Machek <pavel@....cz>
Cc: linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	Kees Cook <keescook@...omium.org>,
	"David S . Miller" <davem@...emloft.net>, benve@...co.com,
	satishkh@...co.com, edumazet@...gle.com, kuba@...nel.org,
	pabeni@...hat.com, netdev@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 6.1 10/12] enic: Avoid false positive under
 FORTIFY_SOURCE

On Mon, Mar 11, 2024 at 10:03:35PM +0100, Pavel Machek wrote:
>Hi!
>
>> From: Kees Cook <keescook@...omium.org>
>>
>> [ Upstream commit 40b9385dd8e6a0515e1c9cd06a277483556b7286 ]
>>
>> FORTIFY_SOURCE has been ignoring 0-sized destinations while the kernel
>> code base has been converted to flexible arrays. In order to enforce
>> the 0-sized destinations (e.g. with __counted_by), the remaining 0-sized
>> destinations need to be handled. Unfortunately, struct vic_provinfo
>> resists full conversion, as it contains a flexible array of flexible
>> arrays, which is only possible with the 0-sized fake flexible array.
>>
>> Use unsafe_memcpy() to avoid future false positives under
>> CONFIG_FORTIFY_SOURCE.
>
>This prepares for future chagnes, but I don't believe we'll port them
>to stable.

Dropped, thanks.

-- 
Thanks,
Sasha