linux-kernel - Re: [PATCH v4 7/9] vsprintf: Factor out %pO handler as kobject

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Message-ID: <20180404234330.GC622@jagdpanzerIV>
Date:   Thu, 5 Apr 2018 08:43:30 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:     Petr Mladek <pmladek@...e.com>
Cc:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        "Tobin C . Harding" <me@...in.cc>, Joe Perches <joe@...ches.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.cz>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        linux-kernel@...r.kernel.org, Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH v4 7/9] vsprintf: Factor out %pO handler as
 kobject_string()

On (04/05/18 08:35), Sergey Senozhatsky wrote:
> 
> Was this your intention?
> 

Ah, it was. You mentioned it in the commit message

: In fact, this avoids leaking the address when invalid %pO format
: specifier is used. The old code fallen back to printing the
: non-hashed value.

Is it so? The default is

	/* default is to _not_ leak addresses, hash before printing */
	return ptr_to_id(buf, end, ptr, spec);

	-ss