linux-kernel - Re: [PATCH] x86, cpuinfo x86_model

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Date:	Tue, 19 May 2015 13:26:18 -0700
From:	Joe Perches <joe@...ches.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Borislav Petkov <bp@...en8.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Fenghua Yu <fenghua.yu@...el.com>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	Ingo Molnar <mingo@...hat.com>,
	Brian Gerst <brgerst@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Igor Mammedov <imammedo@...hat.com>,
	the arch/x86 maintainers <x86@...nel.org>,
	Prarit Bhargava <prarit@...hat.com>
Subject: Re: [PATCH] x86, cpuinfo x86_model_id whitespace cleanup

iOn Tue, 2015-05-19 at 13:16 -0700, Andy Lutomirski wrote:
> On Tue, May 19, 2015 at 12:22 PM, Borislav Petkov <bp@...en8.de> wrote:
> > On Tue, May 19, 2015 at 11:44:41AM -0700, Andy Lutomirski wrote:
> >> On May 19, 2015 11:13 AM, "Borislav Petkov" <bp@...en8.de> wrote:
> >> >
> >> > On Tue, May 19, 2015 at 01:25:59PM -0400, Brian Gerst wrote:
> >> > > Using strlcpy in this manner could fail if it does larger than byte
> >> > > copies and they overlap.
> >> >
> >> > Why?

I think this is traditionally handled by specifying that
the strcpy strings may not overlap, so the suggested

+	strlcpy(c->x86_model_id, strim(c->x86_model_id), 48);

isn't good code.

A temporary intermediate buffer is required.

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