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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org,
	Andrew Morton <akpm@linux-foundation.org>,
	Kees Cook <kees@kernel.org>, Petr Mladek <pmladek@suse.com>,
	Rasmus Villemoes <linux@rasmusvillemoes.dk>,
	Sergey Senozhatsky <senozhatsky@chromium.org>,
	Steven Rostedt <rostedt@goodmis.org>,
	Tycho Andersen <tycho@tycho.pizza>
Subject: Re: [PATCH 1/2] vsprintf: Don't leak pointers for %ps without
 KALLSYMS enabled
Message-ID: <20260820142426.Q3y-RHVx@linutronix.de>
References: <20260814144854.746840-1-bigeasy@linutronix.de>
 <20260814144854.746840-2-bigeasy@linutronix.de>
 <aoAqG0kKxvBbed0M@ashevche-desk.local>
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In-Reply-To: <aoAqG0kKxvBbed0M@ashevche-desk.local>

On 2026-08-15 11:58:03 [+0300], Andy Shevchenko wrote:
> On Fri, Aug 14, 2026 at 04:48:53PM +0200, Sebastian Andrzej Siewior wrote:
> > The "%ps" format modifier prints the name of the symbol which is more
> > valuable in terms of debugging and does not leak the actual pointer.
> > 
> > Without KALLSYMS it will leak the pointer which is not intended. The
> > default policy for pointers is to print a hashed value and not to leak
> > the actual pointer.
> > 
> > Print "(unknown)" for any symbol resolution witout KALLSYMS enabled.
> 
> Hmm... I would expect some test cases to be added/modified.

No bot complained so far, so maybe not ;)

Sebastian