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Thu, 20 Aug 2026 08:28:27 -0700 (PDT) Date: Thu, 20 Aug 2026 17:28:25 +0200 From: Petr Mladek To: Andrew Morton Cc: Sebastian Andrzej Siewior , linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org, Andy Shevchenko , Kees Cook , Rasmus Villemoes , Sergey Senozhatsky , Steven Rostedt , Tycho Andersen Subject: Re: [PATCH 0/2] vsprintf: Don't leak pointers Message-ID: References: <20260814144854.746840-1-bigeasy@linutronix.de> <20260814125647.3e10a3441ca204855b135a5e@linux-foundation.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260814125647.3e10a3441ca204855b135a5e@linux-foundation.org> On Fri 2026-08-14 12:56:47, Andrew Morton wrote: > On Fri, 14 Aug 2026 16:48:52 +0200 Sebastian Andrzej Siewior wrote: > > > It is possible to leak pointers via %ps without KALLSYMS enabled. > > With KALLSYMS pointers can be leaked if they can not be resolved. > > > > The tiny series has two patches, one for each issue. > > > > Thanks. > > fwiw, Sashiko flagged a few possible issues: > https://sashiko.dev/#/patchset/20260814144854.746840-1-bigeasy@linutronix.de Sashiko basically complains about that this might make dump_stack(), panics, and oopses useless on systems without KALLSYMS which is typical on embedded systems. IMHO, it is a good point. What about using default_pointer() resp. %p as the fallback? It would allow to see the pointers with "no_hash_pointers" kernel parameter. Best Regards, Petr