From: Baoquan He <bhe@redhat.com>
To: Julian Stecklina <js@alien8.de>
Cc: x86@kernel.org, Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
hpa@zytor.com, linux-kernel@vger.kernel.org, jschoenh@amazon.de,
Julian Stecklina <jsteckli@amazon.de>
Subject: Re: [PATCH 1/2] x86/boot: fix KASL when memmap range manipulation is used
Date: Mon, 11 Feb 2019 17:09:31 +0800 [thread overview]
Message-ID: <20190211090931.GA2501@localhost> (raw)
In-Reply-To: <1548866403-13390-1-git-send-email-js@alien8.de>
On 01/30/19 at 05:40pm, Julian Stecklina wrote:
> diff --git a/arch/x86/boot/compressed/kaslr.c b/arch/x86/boot/compressed/kaslr.c
> index 9ed9709..5657e34 100644
> --- a/arch/x86/boot/compressed/kaslr.c
> +++ b/arch/x86/boot/compressed/kaslr.c
> @@ -155,6 +155,12 @@ parse_memmap(char *p, unsigned long long *start, unsigned long long *size)
> case '#':
> case '$':
> case '!':
> + /*
> + * % would need some more complex parsing, because regions might
> + * actually become usable for KASLR, but the simple way of
> + * ignoring anything that is mentioned in % works for now.
> + */
This seems to make thing more complicated even though have to. One
concern is whether we need to check the oldtype|newtype , e.g
oldtype=reserverd, newtype=RAM, is it possible to set like that?
Thanks
Baoquan
> + case '%':
> *start = memparse(p + 1, &p);
> return 0;
> case '@':
> --
> 2.7.4
>
next prev parent reply other threads:[~2019-02-11 9:09 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-30 16:40 [PATCH 1/2] x86/boot: fix KASL when memmap range manipulation is used Julian Stecklina
2019-01-30 16:40 ` [PATCH 2/2] x86/boot: increase maximum number of avoided KASLR regions Julian Stecklina
2019-02-05 14:44 ` Borislav Petkov
2019-02-06 12:50 ` Julian Stecklina
2019-02-06 14:17 ` Borislav Petkov
2019-02-06 15:29 ` Kees Cook
2019-02-06 17:53 ` Borislav Petkov
2019-02-11 9:09 ` Baoquan He [this message]
2019-02-11 9:54 ` [PATCH 1/2] x86/boot: fix KASL when memmap range manipulation is used Julian Stecklina
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