linux-kernel - Re: [PATCH] kasan: Add documentation for CONFIG_KASAN_EXTRA

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Message-ID: <8030a0b6-0816-4313-bf70-aa602fc1a871@infradead.org>
Date: Thu, 15 Feb 2024 11:02:51 -0800
From: Randy Dunlap <rdunlap@...radead.org>
To: Juntong Deng <juntong.deng@...look.com>, ryabinin.a.a@...il.com,
 glider@...gle.com, andreyknvl@...il.com, dvyukov@...gle.com,
 vincenzo.frascino@....com, corbet@....net
Cc: kasan-dev@...glegroups.com, linux-doc@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kasan: Add documentation for CONFIG_KASAN_EXTRA_INFO

Hi--

On 2/15/24 10:43, Juntong Deng wrote:
> This patch adds CONFIG_KASAN_EXTRA_INFO introduction information to
> KASAN documentation.
> 
> Signed-off-by: Juntong Deng <juntong.deng@...look.com>
> ---
>  Documentation/dev-tools/kasan.rst | 21 +++++++++++++++++++++
>  1 file changed, 21 insertions(+)
> 
> diff --git a/Documentation/dev-tools/kasan.rst b/Documentation/dev-tools/kasan.rst
> index a5a6dbe9029f..3dc48b08cf71 100644
> --- a/Documentation/dev-tools/kasan.rst
> +++ b/Documentation/dev-tools/kasan.rst
> @@ -277,6 +277,27 @@ traces point to places in code that interacted with the object but that are not
>  directly present in the bad access stack trace. Currently, this includes
>  call_rcu() and workqueue queuing.
>  
> +CONFIG_KASAN_EXTRA_INFO
> +~~~~~~~~~~~~~~~~~~~~~~~
> +

Fix punctuation (run-on sentence):

> +Enabling CONFIG_KASAN_EXTRA_INFO allows KASAN to record and report more
> +information, the extra information currently supported is the CPU number and

   information. The

> +timestamp at allocation and free. More information can help find the cause of
> +the bug and correlate the error with other system events, at the cost of using
> +extra memory to record more information (more cost details in the help text of
> +CONFIG_KASAN_EXTRA_INFO).
> +
> +Here is the report with CONFIG_KASAN_EXTRA_INFO enabled (only the
> +different parts are shown)::
> +
> +    ==================================================================
> +    ...
> +    Allocated by task 134 on cpu 5 at 229.133855s:
> +    ...
> +    Freed by task 136 on cpu 3 at 230.199335s:
> +    ...
> +    ==================================================================
> +
>  Implementation details
>  ----------------------
>  

thanks.
-- 
#Randy