linux-kernel - Re: [PATCH v2 03/28] vsprintf: %pf(%p)

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Date:   Thu, 19 May 2022 22:15:27 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     David Laight <David.Laight@...lab.com>
Cc:     'Kent Overstreet' <kent.overstreet@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mm@...r.kernel.org" <linux-mm@...r.kernel.org>,
        "pmladek@...e.com" <pmladek@...e.com>,
        "rostedt@...dmis.org" <rostedt@...dmis.org>,
        "senozhatsky@...omium.org" <senozhatsky@...omium.org>,
        "andriy.shevchenko@...ux.intel.com" 
        <andriy.shevchenko@...ux.intel.com>
Subject: Re: [PATCH v2 03/28] vsprintf: %pf(%p)

On Thu, May 19, 2022 at 09:06:24PM +0000, David Laight wrote:
> I suspect this a very good way to blow the kernel stack.
> The highest stack use is already very likely to be inside
> the printf code in an error path somewhere.

...

> Double copying using a temporary buffer isn't the end of the world.

How can you hold both of these positions simultaneously?