linux-kernel - Re: [PATCH v4 2/9] vsprintf: Consistent %pK handling for kptr

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Message-ID: <1522933485.21176.353.camel@linux.intel.com>
Date:   Thu, 05 Apr 2018 16:04:45 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Petr Mladek <pmladek@...e.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     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>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        linux-kernel@...r.kernel.org, Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH v4 2/9] vsprintf: Consistent %pK handling for
 kptr_restrict == 0

On Wed, 2018-04-04 at 10:58 +0200, Petr Mladek wrote:
> restricted_pointer() pretends that it prints the address when
> kptr_restrict
> is set to zero. But it is never called in this situation. Instead,
> pointer() falls back to ptr_to_id() and hashes the pointer.
> 
> This patch removes the potential confusion. klp_restrict is checked
> only
> in restricted_pointer().
> 


>  /* Maps a pointer to a 32 bit unique identifier. */
> -static char *ptr_to_id(char *buf, char *end, void *ptr, struct
> printf_spec spec)
> +static char *ptr_to_id(char *buf, char *end,
> +		       const void *ptr, struct printf_spec spec)

I don't think this change belongs to the patch.


-- 
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Intel Finland Oy