linux-kernel - Re: [PATCH 1/2] ARC: U-boot: check arguments paranoidly

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Message-ID: <20190212163904.GA14668@Red>
Date:   Tue, 12 Feb 2019 17:39:04 +0100
From:   LABBE Corentin <clabbe@...libre.com>
To:     Eugeniy Paltsev <eugeniy.paltsev@...opsys.com>
Cc:     linux-snps-arc@...ts.infradead.org,
        Vineet Gupta <vineet.gupta1@...opsys.com>,
        linux-kernel@...r.kernel.org,
        Alexey Brodkin <alexey.brodkin@...opsys.com>,
        khilman@...libre.com
Subject: Re: [PATCH 1/2] ARC: U-boot: check arguments paranoidly

On Tue, Feb 12, 2019 at 06:39:31PM +0300, Eugeniy Paltsev wrote:
> Handle U-boot arguments paranoidly:
>  * don't allow to pass unknown tag.
>  * try to use external device tree blob only if corresponding tag
>    (TAG_DTB) is set.
>  * check that magic number is correct.
>  * don't check uboot_tag if kernel build with no ARC_UBOOT_SUPPORT.
> 
> NOTE:
> If U-boot args are invalid we skip them and try to use embedded device
> tree blob. We can't panic on invalid U-boot args as we really pass
> invalid args due to bug in U-boot code.
> This happens if we don't provide external DTB to U-boot and
> don't set 'bootargs' U-boot environment variable (which is default
> case at least for HSDK board) In that case we will pass
> {r0 = 1 (bootargs in r2); r1 = 0; r2 = 0;} to linux which is invalid.
> 
> NOTE:
> We can safely check U-boot magic value (0x0) in linux passed via
> r1 register as U-boot pass it from the beginning.
> 
> While I'm at it refactor U-boot arguments handling code.
> 

Hello

I have tried to test this serie, but this patch does not apply anymore on current next tree.
It conflicts with "ARC: boot: robustify u-boot arg referencing".

Regards