linux-kernel - Re: [PATCH 2/3] kbuild: clamp SUBLEVEL to 255

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Date:   Sat, 6 Feb 2021 13:51:17 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Sasha Levin <sashal@...nel.org>
Cc:     masahiroy@...nel.org, michal.lkml@...kovi.net,
        linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        torvalds@...ux-foundation.org
Subject: Re: [PATCH 2/3] kbuild: clamp SUBLEVEL to 255

On Fri, Feb 05, 2021 at 10:50:32PM -0500, Sasha Levin wrote:
> Right now if SUBLEVEL becomes larger than 255 it will overflow into the
> territory of PATCHLEVEL, causing havoc in userspace that tests for
> specific kernel version.
> 
> While userspace code tests for MAJOR and PATCHLEVEL, it doesn't test
> SUBLEVEL at any point as ABI changes don't happen in the context of
> stable tree.
> 
> Thus, to avoid overflows, simply clamp SUBLEVEL to it's maximum value in
> the context of LINUX_VERSION_CODE. This does not affect "make
> kernelversion" and such.
> 
> Signed-off-by: Sasha Levin <sashal@...nel.org>


Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>