linux-kernel - Re: [RFC][PATCH] printf: Harden accessing pointer dereference in vsprintf()

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Message-ID: <CAHk-=whe3Kzk06s7dW4xwN+oiO2sDyDHCGOGrY892VtCLUQ1ig@mail.gmail.com>
Date: Mon, 6 Jan 2025 15:29:01 -0800
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: LKML <linux-kernel@...r.kernel.org>, Andrew Morton <akpm@...ux-foundation.org>, 
	Petr Mladek <pmladek@...e.com>, Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, 
	Rasmus Villemoes <linux@...musvillemoes.dk>, Sergey Senozhatsky <senozhatsky@...omium.org>, 
	Kees Cook <keescook@...omium.org>
Subject: Re: [RFC][PATCH] printf: Harden accessing pointer dereference in vsprintf()

On Mon, 6 Jan 2025 at 14:25, Steven Rostedt <rostedt@...dmis.org> wrote:
>
> Linus had suggested adding this kind of check[1]. This is a bit different
> than Linus's solution as it utilizes copy_from_kernel_nofault() and doesn't
> require calls to pagefault_disable() and extra labels.

Yeah, and it generates horrendous code as a result.

               Linus