linux-kernel - Re: [PATCH v6 8/9] vsprintf: Prevent crash when dereferencing invalid pointers

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Message-ID: <20190219125115.GA19910@tigerII.localdomain>
Date:   Tue, 19 Feb 2019 21:51:15 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Petr Mladek <pmladek@...e.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        "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 Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 8/9] vsprintf: Prevent crash when dereferencing
 invalid pointers

On (02/19/19 13:02), Andy Shevchenko wrote:
[..]
> And if it's not? You will get in either case incomplete information,
> but at least with "(e" (or even "(") you might get a clue that it
> errornous conditions.

The thing I'm signaling here is that in some cases we still can
crash the kernel; with the difference that invalid dereference
can now be a memory corruption. Just saying.

	-ss