linux-kernel - Re: [PATCH] kasan: Respect /proc/sys/kernel/traceoff_on

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Date:   Wed, 25 Jan 2017 15:38:24 +0100
From:   Alexander Potapenko <glider@...gle.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH] kasan: Respect /proc/sys/kernel/traceoff_on_warning

On Wed, Jan 25, 2017 at 3:25 PM, Peter Zijlstra <peterz@...radead.org> wrote:
>
> After much waiting I finally reproduced a KASAN issue, only to find my
> trace-buffer empty of useful information because it got spooled out :/
>
> Make kasan_report honour the /proc/sys/kernel/traceoff_on_warning
> interface.
>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Acked-by: Alexander Potapenko <glider@...gle.com>
> ---
>  mm/kasan/report.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/mm/kasan/report.c b/mm/kasan/report.c
> index b82b3e2..6ff7efc 100644
> --- a/mm/kasan/report.c
> +++ b/mm/kasan/report.c
> @@ -300,6 +300,8 @@ void kasan_report(unsigned long addr, size_t size,
>         if (likely(!kasan_report_enabled()))
>                 return;
>
> +       disable_trace_on_warning();
> +
>         info.access_addr = (void *)addr;
>         info.access_size = size;
>         info.is_write = is_write;



-- 
Alexander Potapenko
Software Engineer

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