linux-kernel - Re: [PATCH 1/2] x86: fix panic when handling "mem={invalid}" param

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Date:	Fri, 4 Feb 2011 11:44:23 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Kamal Mostafa <kamal@...onical.com>
Cc:	x86@...nel.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Len Brown <len.brown@...el.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] x86: fix panic when handling "mem={invalid}" param

On Thu, Feb 3, 2011 at 5:38 PM, Kamal Mostafa <kamal@...onical.com> wrote:
> Avoid removing all of memory and panicing when "mem={invalid}" is
> specified, e.g. mem=blahblah, mem=0, or mem=nopentium (on platforms
> other than x86_32).
>
> BugLink: http://bugs.launchpad.net/bugs/553464
> Signed-off-by: Kamal Mostafa <kamal@...onical.com>
> Cc: <stable@...nel.org>
> ---
>  arch/x86/kernel/e820.c |    3 +++
>  1 files changed, 3 insertions(+), 0 deletions(-)
>
> diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
> index 294f26d..55a59d8 100644
> --- a/arch/x86/kernel/e820.c
> +++ b/arch/x86/kernel/e820.c
> @@ -856,6 +856,9 @@ static int __init parse_memopt(char *p)
>
>        userdef = 1;
>        mem_size = memparse(p, &p);
> +       /* don't remove all of memory when handling "mem={invalid}" param */
> +       if (mem_size == 0)
> +               return -EINVAL;
>        e820_remove_range(mem_size, ULLONG_MAX - mem_size, E820_RAM, 1);
>
>        return 0;
> --

then how about some one pass mem=32M etc?

or total wrongly usermap?

Yinghai
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