From: Geert Uytterhoeven <geert@linux-m68k.org>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Vlastimil Babka <vbabka@suse.cz>, Petr Mladek <pmladek@suse.com>,
Marco Elver <elver@google.com>, Timur Tabi <timur@kernel.org>,
Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
Matthew Wilcox <willy@infradead.org>,
Andrew Morton <akpm@linux-foundation.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
roman.fietze@magna.com, Kees Cook <keescook@chromium.org>,
John Ogness <john.ogness@linutronix.de>,
Akinobu Mita <akinobu.mita@gmail.com>,
Alexander Potapenko <glider@google.com>,
Andrey Konovalov <andreyknvl@google.com>,
Rasmus Villemoes <linux@rasmusvillemoes.dk>,
Pavel Machek <pavel@ucw.cz>,
Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linux MM <linux-mm@kvack.org>
Subject: Re: [PATCH 3/3] [v4] lib/vsprintf: no_hash_pointers prints all addresses as unhashed
Date: Tue, 2 Mar 2021 15:28:09 +0100 [thread overview]
Message-ID: <CAMuHMdVYJ0ydFEZ+xPLt27J9pBW+B8pJNPBDZ2Vw5g5k1atarg@mail.gmail.com> (raw)
In-Reply-To: <20210302090811.620ae7d0@gandalf.local.home>
Hi Steven,
On Tue, Mar 2, 2021 at 3:08 PM Steven Rostedt <rostedt@goodmis.org> wrote:
> On Tue, 2 Mar 2021 14:49:42 +0100
> Geert Uytterhoeven <geert@linux-m68k.org> wrote:
> > > So this is basically a kernel tinyfication issue, right? Is that still pursued
> > > today? Are there better config options suitable for this than CONFIG_DEBUG_KERNEL?
> >
> > As long as I hear about products running Linux on SoCs with 10 MiB of
> > SRAM, I think the answer is yes.
> > I'm not immediately aware of a better config option. There are no more
> > TINY options left, and EXPERT selects DEBUG_KERNEL.
>
> Since the trace_printk() uses the same type of notice, I wonder if we could
> make this into a helper function and just pass in the top part.
>
> + pr_warn("**********************************************************\n");
> + pr_warn("** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **\n");
> + pr_warn("** **\n");
>
>
> + pr_warn("** This system shows unhashed kernel memory addresses **\n");
> + pr_warn("** via the console, logs, and other interfaces. This **\n");
> + pr_warn("** might reduce the security of your system. **\n");
>
> Only the above section is really unique. The rest can be a boiler plate.
Good idea. drivers/iommu/iommu-debugfs.c has a third copy.
> + pr_warn("** **\n");
> + pr_warn("** If you see this message and you are not debugging **\n");
> + pr_warn("** the kernel, report this immediately to your system **\n");
> + pr_warn("** administrator! **\n");
> + pr_warn("** **\n");
> + pr_warn("** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **\n");
> + pr_warn("**********************************************************\n");
Fortunately gcc is already smart enough to deduplicate identical strings,
but only in the same source file.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
next prev parent reply other threads:[~2021-03-02 19:56 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-14 16:13 [PATCH 0/3][v4] add support for never printing hashed addresses Timur Tabi
2021-02-14 16:13 ` [PATCH 1/3] [v4] lib: use KSTM_MODULE_GLOBALS macro in kselftest drivers Timur Tabi
2021-02-14 16:13 ` [PATCH 2/3] [v4] kselftest: add support for skipped tests Timur Tabi
2021-02-14 16:13 ` [PATCH 3/3] [v4] lib/vsprintf: no_hash_pointers prints all addresses as unhashed Timur Tabi
2021-03-02 11:51 ` Geert Uytterhoeven
2021-03-02 12:45 ` Marco Elver
2021-03-02 12:51 ` Geert Uytterhoeven
2021-03-02 13:29 ` Petr Mladek
2021-03-02 13:37 ` Vlastimil Babka
2021-03-02 13:49 ` Geert Uytterhoeven
2021-03-02 14:08 ` Steven Rostedt
2021-03-02 14:26 ` Marco Elver
2021-03-02 14:35 ` Matthew Wilcox
2021-03-02 14:40 ` Marco Elver
2021-03-02 14:55 ` Geert Uytterhoeven
2021-03-02 14:57 ` Marco Elver
2021-03-02 14:28 ` Geert Uytterhoeven [this message]
2021-03-02 15:16 ` Rasmus Villemoes
2021-03-02 15:29 ` Andy Shevchenko
2021-03-02 17:53 ` Petr Mladek
2021-09-11 2:25 ` Xiaoming Ni
2021-09-11 2:39 ` Tetsuo Handa
2021-02-14 16:18 ` [PATCH 0/3][v4] add support for never printing hashed addresses Timur Tabi
2021-02-15 11:08 ` Petr Mladek
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