linux-kernel - Re: [PATCH] vsprintf: Add command line option debug_boot_weak

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <f9bacaa1-7741-d28e-29d1-4b42ae0c986f@infradead.org>
Date:   Tue, 15 May 2018 08:29:47 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     "Tobin C. Harding" <me@...in.cc>,
        Steven Rostedt <rostedt@...dmis.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        Anna-Maria Gleixner <anna-maria@...utronix.de>,
        Theodore Ts'o <tytso@....edu>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] vsprintf: Add command line option debug_boot_weak_hash

On 05/14/2018 09:38 PM, Tobin C. Harding wrote:

>  Documentation/admin-guide/kernel-parameters.txt |  8 ++++++++
>  lib/vsprintf.c                                  | 18 ++++++++++++++++++
>  2 files changed, 26 insertions(+)
> 
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index 3b8032431585..c95dd6704592 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -748,6 +748,14 @@
>  
>  	debug		[KNL] Enable kernel debugging (events log level).
>  
> +	debug_boot_weak_hash
> +			[KNL] Enable debugging early in the boot sequence.  If

That makes it sound like "debug_boot_weak_hash" turns on early debugging.

> +			enabled, we use a weak hash instead of siphash to hash
> +			pointers.  Use this option if you need to see pointer
> +			values during early boot (i.e you are seeing instances

			                          i.e.

> +			of '(___ptrval___)') - cryptographically insecure,
> +			please do not use on production kernels.
> +
>  	debug_locks_verbose=
>  			[KNL] verbose self-tests
>  			Format=<0|1>


-- 
~Randy