Re: [PATCH 1/2] vsprintf: Don't leak pointers for %ps without KALLSYMS enabled

Andy Shevchenko <[email protected]> Sat, 15 Aug 2026 11:58:03 +0300

Newsgroups	org.kernel.vger.linux-hardening,org.kernel.vger.linux-kernel
Organization	Intel Finland Oy - BIC 0357606-4 - c/o Alberga Business Park, 6 krs, Bertel Jungin Aukio 5, 02600 Espoo
Message-ID	<[email protected]>

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.
-- 
With Best Regards,
Andy Shevchenko