linux-kernel - Re: [PATCHv2 2/3] kernel: add support for live patching

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Date:	Tue, 18 Nov 2014 08:26:27 -0600
From:	Seth Jennings <sjenning@...hat.com>
To:	Miroslav Benes <mbenes@...e.cz>
Cc:	Josh Poimboeuf <jpoimboe@...hat.com>,
	Jiri Kosina <jkosina@...e.cz>,
	Vojtech Pavlik <vojtech@...e.cz>,
	Steven Rostedt <rostedt@...dmis.org>,
	Petr Mladek <pmladek@...e.cz>,
	Christoph Hellwig <hch@...radead.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	Andy Lutomirski <luto@...capital.net>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	live-patching@...r.kernel.org, x86@...nel.org, kpatch@...hat.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2 2/3] kernel: add support for live patching

On Tue, Nov 18, 2014 at 03:11:43PM +0100, Miroslav Benes wrote:
> 
> Hi,
> 
> thank you for the revision. I'll rebase our patches on top of that. Anyway 
> there is a small bug in a header file. See below.
> 
> On Sun, 16 Nov 2014, Seth Jennings wrote:
> 
> [...]
> 
> > diff --git a/arch/x86/include/asm/livepatch.h 
> b/arch/x86/include/asm/livepatch.h
> > new file mode 100644
> > index 0000000..c5fab45
> > --- /dev/null
> > +++ b/arch/x86/include/asm/livepatch.h
> > @@ -0,0 +1,38 @@
> > +/*
> > + * livepatch.h - x86-specific Live Kernel Patching Core
> > + *
> > + * Copyright (C) 2014 Seth Jennings <sjenning@...hat.com>
> > + *
> > + * This program is free software; you can redistribute it and/or
> > + * modify it under the terms of the GNU General Public License
> > + * as published by the Free Software Foundation; either version 2
> > + * of the License, or (at your option) any later version.
> > + *
> > + * This program is distributed in the hope that it will be useful,
> > + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> > + * GNU General Public License for more details.
> > + *
> > + * You should have received a copy of the GNU General Public License
> > + * along with this program; if not, see <http://www.gnu.org/licenses/>.
> > + */
> > +
> > +#ifndef _ASM_X86_LIVEPATCH_H
> > +#define _ASM_X86_LIVEPATCH_H
> > +
> > +#include <linux/module.h>
> > +
> > +#ifdef CONFIG_LIVE_PATCHING
> > +extern int lpc_write_module_reloc(struct module *mod, unsigned long 
> type,
> > +                               unsigned long loc, unsigned long value);
> > +
> > +#else
> > +static int lpc_write_module_reloc(struct module *mod, unsigned long 
> type,
> > +                               unsigned long loc, unsigned long value);
> > +{
> > +     pr_err("Kernel does not support live patching\n");
> > +     return -ENOSYS;
> > +}
> > +#endif
> > +
> > +#endif /* _ASM_X86_LIVEPATCH_H */
> 
> There should not be a semicolon at the end of the function header in #else 
> branch.

Good catch.

Also, I'm adding "build with LIVE_PATCHING=n" as a test step :-/

Thanks,
Seth

> 
> Regards,
> 
> ---
> Miroslav Benes
> SUSE Labs
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