From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AB8JxZqZyg7Ffy0uSom90//CpYj/ivZQKylQfOM6aLHWxWY5QRaJZUN3AUtwgAUie8VxCSfP5aG1 ARC-Seal: i=1; a=rsa-sha256; t=1526398192; cv=none; d=google.com; s=arc-20160816; b=XOsddM1Sz+AswmAjeQLjOMZ6CazA8qvH0UHhQrhTKGOwfb5QsftcVDwjW22lgmNaed wkHcG/2M2sedRdJ174BCTTgy8byXk2ybsd+uqeayLOW6N+vF7VqefBzmYtMUXNDru9i9 BPnBjs3EEB5ynkyn0NMXuZ0kxbSU1b45Auw773hf2xpiat128uH1kRvX1g3G3Ymw+hKq e9a4I//IyDXlpVmmEe81O0nlL/kCt2K2UONayab0pyrkUkf7xgvyzp0nERmP9uSZDRWg JixZ1NAU2kY9a1mVXRe0aH2pyDqhtVFdy6Y39FFXf9msbXS/02HV9v7H2PXQ2YPwi5dE d1kA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=content-transfer-encoding:content-language:in-reply-to:mime-version :user-agent:date:message-id:from:references:cc:to:subject :dkim-signature:arc-authentication-results; bh=UI4G9BrRXUBY2D9NjoeqbkpElVzcCtTs0BeSsscv2e0=; b=t8bfwCv6IJsqJIC8N1GkN5laGxpYHimswaR59KuA7fNrX2J31eJeGEybQvV0rn47MO QocaMCJd6C+I9isX+yeg3tO0XRQP0/7xAQENK9TBcsm81uOM91pJyf3LDcIxXkSlEra9 aBOnVKL6GEVkeJDbzDBGEhAx2fz9rUwUYMNpjKFtWjhUKe/n78WCZ3qNmFx4hAYc70rG FQ51csKGLZzPf79JvyQ4aZcn19xmLoAGt59sOrW8Ejr/gNqZz4AJkRxh2pOAO0MABHY6 BMv+vBe8FyXZZGcHK/bNC7NLELHyy6FmOSYWX7iG2aejbsECT294IuGwbv0MESzDRBDO M1Vw== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@infradead.org header.s=bombadil.20170209 header.b=h0jD9yRz; spf=pass (google.com: best guess record for domain of rdunlap@infradead.org designates 2607:7c80:54:e::133 as permitted sender) smtp.mailfrom=rdunlap@infradead.org Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=bombadil.20170209 header.b=h0jD9yRz; spf=pass (google.com: best guess record for domain of rdunlap@infradead.org designates 2607:7c80:54:e::133 as permitted sender) smtp.mailfrom=rdunlap@infradead.org Subject: Re: [PATCH] vsprintf: Add command line option debug_boot_weak_hash To: "Tobin C. Harding" , Steven Rostedt , Andrew Morton Cc: Linus Torvalds , Kees Cook , Anna-Maria Gleixner , Theodore Ts'o , Greg Kroah-Hartman , Arnd Bergmann , linux-kernel@vger.kernel.org References: <1526359115-5489-1-git-send-email-me@tobin.cc> From: Randy Dunlap Message-ID: Date: Tue, 15 May 2018 08:29:47 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 In-Reply-To: <1526359115-5489-1-git-send-email-me@tobin.cc> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1600503563774077130?= X-GMAIL-MSGID: =?utf-8?q?1600544511142614617?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 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