From: Marco Elver <elver@google.com>
To: Matthew Wilcox <willy@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>,
Geert Uytterhoeven <geert@linux-m68k.org>,
Vlastimil Babka <vbabka@suse.cz>, Petr Mladek <pmladek@suse.com>,
Timur Tabi <timur@kernel.org>,
Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
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 15:40:34 +0100 [thread overview]
Message-ID: <CANpmjNNMFtJvkVBhjpp=YqFb3ck8Q4Ak8nGtB21XMd9ds_APFA@mail.gmail.com> (raw)
In-Reply-To: <20210302143516.GY2723601@casper.infradead.org>
On Tue, 2 Mar 2021 at 15:35, Matthew Wilcox <willy@infradead.org> wrote:
>
> On Tue, Mar 02, 2021 at 03:26:50PM +0100, Marco Elver wrote:
> > +static const char no_hash_pointers_warning[9][55] __initconst = {
> > + "******************************************************",
> > + " NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE ",
> > + " ",
> > + " This system shows unhashed kernel memory addresses ",
> > + " via the console, logs, and other interfaces. This ",
> > + " might reduce the security of your system. ",
> > + " If you see this message and you are not debugging ",
> > + " the kernel, report this immediately to your system ",
> > + " administrator! ",
> > +};
> > +
> > static int __init no_hash_pointers_enable(char *str)
> > {
> > + const int lines[] = { 0, 1, 2, 3, 4, 5, 2, 6, 7, 8, 2, 1, 0 };
> > + int i;
> > +
> > no_hash_pointers = true;
> >
> > - 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");
> > - 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");
> > + for (i = 0; i < ARRAY_SIZE(lines); i++)
> > + pr_warn("**%s**\n", no_hash_pointers_warning[lines[i]]);
>
> + for (i = 0; i < 3; i++)
> + pr_warn("**%s**\n", no_hash_pointers_warning[lines[2 - i]]);
Yeah, I had that before, but then wanted to deal with the blank line
in the middle of the thing. So I just went with the lines array above,
which seemed cleanest for dealing with the middle blank line and
footer. Or maybe there's something even nicer I missed? :-)
Thanks,
-- Marco
next prev parent reply other threads:[~2021-03-02 19:48 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 [this message]
2021-03-02 14:55 ` Geert Uytterhoeven
2021-03-02 14:57 ` Marco Elver
2021-03-02 14:28 ` Geert Uytterhoeven
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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