linux-kernel - Re: [PATCH v2 3/4] Revert "xen/balloon: Fix crash when ballooning on x86 32 bit PAE"

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Date:   Fri, 24 Jul 2020 15:20:51 +0200
From:   Jürgen Groß <jgross@...e.com>
To:     Roger Pau Monne <roger.pau@...rix.com>,
        linux-kernel@...r.kernel.org
Cc:     Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        xen-devel@...ts.xenproject.org
Subject: Re: [PATCH v2 3/4] Revert "xen/balloon: Fix crash when ballooning on
 x86 32 bit PAE"

On 24.07.20 14:42, Roger Pau Monne wrote:
> This reverts commit dfd74a1edfaba5864276a2859190a8d242d18952.
> 
> This has been fixed by commit dca4436d1cf9e0d237c which added the out
> of bounds check to __add_memory, so that trying to add blocks past
> MAX_PHYSMEM_BITS will fail.
> 
> Note the check in the Xen balloon driver was bogus anyway, as it
> checked the start address of the resource, but it should instead test
> the end address to assert the whole resource falls below
> MAX_PHYSMEM_BITS.
> 
> Signed-off-by: Roger Pau Monné <roger.pau@...rix.com>

Reviewed-by: Juergen Gross <jgross@...e.com>


Juergen