linux-kernel - Re: [PATCH 2/3] PM / devfreq: Fix buffer overflow in trans_stat

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Date:   Thu, 2 Nov 2023 18:26:22 +0100
From:   Christian Marangi <ansuelsmth@...il.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Takashi Iwai <tiwai@...e.de>,
        Jonghwa Lee <jonghwa3.lee@...sung.com>,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Cc:     stable@...r.kernel.org
Subject: Re: [PATCH 2/3] PM / devfreq: Fix buffer overflow in trans_stat_show

On Tue, Oct 24, 2023 at 08:30:15PM +0200, Christian Marangi wrote:
> Fix buffer overflow in trans_stat_show().
> 
> Convert simple snprintf to the more secure scnprintf with size of
> PAGE_SIZE.
> 
> Add condition checking if we are exceeding PAGE_SIZE and exit early from
> loop. Also add at the end a warning that we exceeded PAGE_SIZE and that
> stats is disabled.
> 
> Return -EFBIG in the case where we don't have enough space to write the
> full transition table.
> 
> Also document in the ABI that this function can return -EFBIG error.
> 
> Cc: stable@...r.kernel.org
> Closes: https://bugzilla.kernel.org/show_bug.cgi?id=218041
> Fixes: e552bbaf5b98 ("PM / devfreq: Add sysfs node for representing frequency transition information.")
> Signed-off-by: Christian Marangi <ansuelsmth@...il.com>

Any news for this?

-- 
	Ansuel