linux-kernel - Re: [PATCH] staging: android: ashmem: add size field in procfs fdinfo

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Message-ID: <YMx0GIRQmpRC7pdQ@kroah.com>
Date:   Fri, 18 Jun 2021 12:23:20 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     liuhailong <liuhailong@...o.com>
Cc:     arve@...roid.com, tkjos@...roid.com, maco@...roid.com,
        joel@...lfernandes.org, christian@...uner.io, hridya@...gle.com,
        surenb@...gle.com, linux-kernel@...r.kernel.org,
        linux-staging@...ts.linux.dev
Subject: Re: [PATCH] staging: android: ashmem: add size field in procfs fdinfo

On Fri, Jun 18, 2021 at 05:50:35PM +0800, liuhailong wrote:
> add this information to help user to find ashmem problem.
> 
> ashmem leak scenario:
> -000|fd = ashmem_create_region
> -001|mmap and pagefault
> -002|munmap
> -003|forget close(fd) <---- which lead to ashmem leak
> 
> Signed-off-by: liuhailong <liuhailong@...o.com>
> ---
>  drivers/staging/android/ashmem.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/staging/android/ashmem.c b/drivers/staging/android/ashmem.c
> index d66a64e42273..ee2fd75111d8 100644
> --- a/drivers/staging/android/ashmem.c
> +++ b/drivers/staging/android/ashmem.c
> @@ -894,6 +894,8 @@ static void ashmem_show_fdinfo(struct seq_file *m, struct file *file)
>  		seq_printf(m, "name:\t%s\n",
>  			   asma->name + ASHMEM_NAME_PREFIX_LEN);
>  
> +	seq_printf(m, "size:\t%zu\n", asma->size);
> +
>  	mutex_unlock(&ashmem_mutex);
>  }
>  #endif
> -- 
> 2.30.2
> 
> 

As you are changing a user-facing proc file, what tools will break now
that you have added a new line?

What tools do you use to look at this file and what has been modified to
handle the change?

thanks,

greg k-h