linux-hardening - Re: [PATCH v9 01/15] modpost: fix removing numeric suffixes

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Date:   Mon, 3 Jan 2022 14:07:40 +0100 (CET)
From:   Miroslav Benes <mbenes@...e.cz>
To:     Alexander Lobakin <alexandr.lobakin@...el.com>
cc:     linux-hardening@...r.kernel.org, x86@...nel.org,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
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Subject: Re: [PATCH v9 01/15] modpost: fix removing numeric suffixes

On Thu, 23 Dec 2021, Alexander Lobakin wrote:

> For now, that condition from remove_dot():
> 
> if (m && (s[n + m] == '.' || s[n + m] == 0))
> 
> which was designed to test if it's a dot or a \0 after the suffix
> is never satisfied.
> This is due to that s[n + m] always points to the last digit of a
> numeric suffix, not on the symbol next to it:
> 
> param_set_uint.0, s[n + m] is '0', s[n + m + 1] is '\0'
> 
> So it's off by one and was like that since 2014.
> 
> `-z uniq-symbol` linker flag which we are planning to use to

`-z unique-symbol`

Miroslav