linux-kernel - Re: [PATCH 11/22] KVM: MMU: Add infrastructure for two-level page walker

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20100428110333.GD18832@amd.com>
Date:	Wed, 28 Apr 2010 13:03:33 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	Avi Kivity <avi@...hat.com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 11/22] KVM: MMU: Add infrastructure for two-level page
 walker

On Tue, Apr 27, 2010 at 03:34:10PM +0300, Avi Kivity wrote:
> On 04/27/2010 01:38 PM, Joerg Roedel wrote:
> >This patch introduces a mmu-callback to translate gpa
> >addresses in the walk_addr code. This is later used to
> >translate l2_gpa addresses into l1_gpa addresses.
> >
> >+static inline gfn_t gpa_to_gfn(gpa_t gpa)
> >+{
> >+	return (gfn_t)gpa>>  PAGE_SHIFT;
> >+}
> >+
> 
> This overflows on 32-bit, since gpa_t is u64 and gfn_t is ulong.

Thinking again about it, on 32 bit the physical address width is only 36
bits. So there shouldn't be an overflow, no?

	Joerg


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/