linux-kernel - Re: [PATCH V7 5/7] cpufreq: Register notifiers with the PM QoS framework

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Date:   Mon, 14 Oct 2019 15:12:15 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Rafael Wysocki <rjw@...ysocki.net>, linux-pm@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>, mka@...omium.org,
        ulf.hansson@...aro.org, sfr@...b.auug.org.au, pavel@....cz,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org
Subject: Re: [PATCH V7 5/7] cpufreq: Register notifiers with the PM QoS
 framework

On 22-09-19, 23:12, Dmitry Osipenko wrote:
> This patch causes use-after-free on a cpufreq driver module reload. Please take a look, thanks in advance.
> 
> 
> [   87.952369] ==================================================================
> [   87.953259] BUG: KASAN: use-after-free in notifier_chain_register+0x4f/0x9c
> [   87.954031] Read of size 4 at addr e6abbd0c by task modprobe/243

Hi Dmitry,

I tried to reproduce it on my ubuntu on ARM64 setup and I couldn't hit
these issues on v5.4-rc1 with Kasan built in.

I then enabled Kasan (tried both inline and outline instrumentation)
but I couldn't get past the issues with module insertion. It fails
like this for me:

root@...aro-developer:~/work# insmod cpufreq-dt.ko 
[   72.985974] cpufreq_dt: Unknown symbol __asan_report_load1_noabort (err -2)
[   72.993164] cpufreq_dt: Unknown symbol __asan_report_load4_noabort (err -2)
[   73.000307] cpufreq_dt: Unknown symbol __asan_report_load8_noabort (err -2)
[   73.007451] cpufreq_dt: Unknown symbol __asan_report_store1_noabort (err -2)
[   73.014643] cpufreq_dt: Unknown symbol __asan_register_globals (err -2)
[   73.021409] cpufreq_dt: Unknown symbol __asan_unregister_globals (err -2)
[   73.028349] cpufreq_dt: Unknown symbol __asan_report_store8_noabort (err -2)
[   73.035543] cpufreq_dt: Unknown symbol __asan_report_store4_noabort (err -2)
insmod: ERROR: could not insert module cpufreq-dt.ko: Unknown symbol in module

I tried to search for these errors but couldn't find why I am getting
these and why the symbols are missing here. Can you suggest something
here ?

-- 
viresh