linux-kernel - Re: [PATCH v9 3/4] kasan: Add report for async mode

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Date:   Fri, 29 Jan 2021 18:46:38 +0000
From:   Vincenzo Frascino <vincenzo.frascino@....com>
To:     Andrey Konovalov <andreyknvl@...gle.com>,
        Alexander Potapenko <glider@...gle.com>
Cc:     Branislav Rankov <Branislav.Rankov@....com>,
        Marco Elver <elver@...gle.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Evgenii Stepanov <eugenis@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Will Deacon <will@...nel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v9 3/4] kasan: Add report for async mode

Hi Andrey,

On 1/29/21 6:16 PM, Vincenzo Frascino wrote:
> What I meant is instead of:
> 
> if (addr) trace_error_report_end(...);
> 
> you might want to do:
> 
> if (!IS_ENABLED(CONFIG_KASAN_HW_TAGS)) trace_error_report_end(...);
> 
> because, could make sense to trace 0 in other cases?
> 
> I could not find the implementation of trace_error_report_end() hence I am not
> really sure on what it does.

I figured it out how trace_error_report_end() works. And in doing that I
realized that the problem is sync vs async, hence I agree with what you are
proposing:

if (addr) trace_error_report_end(...);

I will post v10 shortly. If we want to trace the async mode we can improve it in
-rc1.

-- 
Regards,
Vincenzo