linux-kernel - Re: [RFC PATCH v3] UML: add support for KASAN under x86

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Message-ID: <d5558b1a1ce7e1cb878f12462ae63a4d7b1b17a1.camel@sipsolutions.net>
Date:   Thu, 26 May 2022 11:29:20 +0200
From:   Johannes Berg <johannes@...solutions.net>
To:     David Gow <davidgow@...gle.com>,
        Vincent Whitchurch <vincent.whitchurch@...s.com>,
        Patricia Alfonso <trishalfonso@...gle.com>,
        Jeff Dike <jdike@...toit.com>,
        Richard Weinberger <richard@....at>,
        anton.ivanov@...bridgegreys.com,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Brendan Higgins <brendanhiggins@...gle.com>
Cc:     kasan-dev <kasan-dev@...glegroups.com>,
        linux-um@...ts.infradead.org, LKML <linux-kernel@...r.kernel.org>,
        Daniel Latypov <dlatypov@...gle.com>
Subject: Re: [RFC PATCH v3] UML: add support for KASAN under x86_64

On Wed, 2022-05-25 at 18:01 -0700, David Gow wrote:
> 
> +#ifdef CONFIG_KASAN
> +void kasan_init(void)
> +{
> +	/*
> +	 * kasan_map_memory will map all of the required address space and
> +	 * the host machine will allocate physical memory as necessary.
> +	 */
> +	kasan_map_memory((void *)KASAN_SHADOW_START, KASAN_SHADOW_SIZE);
> +	init_task.kasan_depth = 0;
> +	os_info("KernelAddressSanitizer initialized\n");
> 

Can we remove this? Or maybe print it later somehow, when the other
KASAN machinery initializes?

As it is, this gets printed even if you run just "./linux --version" or
"--help", which is a bit strange.

johannes