From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail.skyhub.de ([2a01:4f8:120:8448::d00d]) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1WvMFy-0006W1-QL for kexec@lists.infradead.org; Fri, 13 Jun 2014 07:50:41 +0000 Date: Fri, 13 Jun 2014 09:50:11 +0200 From: Borislav Petkov Subject: Re: [PATCH 07/13] kexec: Implementation of new syscall kexec_file_load Message-ID: <20140613075011.GA4751@pd.tnic> References: <1401800822-27425-1-git-send-email-vgoyal@redhat.com> <1401800822-27425-8-git-send-email-vgoyal@redhat.com> <20140606065605.GE2785@dhcp-17-89.nay.redhat.com> <20140606181859.GK1526@redhat.com> <20140609021122.GB1924@darkstar.nay.redhat.com> <20140609053538.GA2874@dhcp-17-89.nay.redhat.com> <20140609154137.GD22049@redhat.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20140609154137.GD22049@redhat.com> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "kexec" Errors-To: kexec-bounces+dwmw2=infradead.org@lists.infradead.org To: Vivek Goyal Cc: mjg59@srcf.ucam.org, bhe@redhat.com, greg@kroah.com, hpa@zytor.com, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, ebiederm@xmission.com, jkosina@suse.cz, akpm@linux-foundation.org, Dave Young , WANG Chao On Mon, Jun 09, 2014 at 11:41:37AM -0400, Vivek Goyal wrote: > IIUC, COMMAND_LINE_SIZE gives max limits of running kernel and it does > not tell us anything about command line size supported by kernel being > loaded. Whatever you do, you do need a sane default because even querying the boot protocol is not reliable as the to-be-loaded kernel's boot protocol might be manipulated too, before signing (who knows what people do in the wild). So having a sane, unconditional fallback COMMAND_LINE_SIZE from the first kernel is a must, methinks. -- Regards/Gruss, Boris. Sent from a fat crate under my desk. Formatting is fine. -- _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec