linux-kernel - Re: [PATCH 13/24] xen/arm: get privilege status

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]

Date:	Fri, 27 Jul 2012 10:44:36 +0100
From:	Ian Campbell <Ian.Campbell@...rix.com>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"konrad.wilk@...cle.com" <konrad.wilk@...cle.com>,
	"Tim (Xen.org)" <tim@....org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linaro-dev@...ts.linaro.org" <linaro-dev@...ts.linaro.org>,
	"catalin.marinas@....com" <catalin.marinas@....com>,
	"arnd@...db.de" <arnd@...db.de>
Subject: Re: [PATCH 13/24] xen/arm: get privilege status

On Thu, 2012-07-26 at 16:33 +0100, Stefano Stabellini wrote:
> Use Xen features to figure out if we are privileged.
> 
> XENFEAT_dom0 was introduced by 23735 in xen-unstable.hg.
> 
> Signed-off-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
> ---
>  arch/arm/xen/enlighten.c         |    7 +++++++
>  include/xen/interface/features.h |    3 +++
>  2 files changed, 10 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
> index dc68074..2e013cf 100644
> --- a/arch/arm/xen/enlighten.c
> +++ b/arch/arm/xen/enlighten.c
> @@ -2,6 +2,7 @@
>  #include <xen/interface/xen.h>
>  #include <xen/interface/memory.h>
>  #include <xen/platform_pci.h>
> +#include <xen/features.h>
>  #include <asm/xen/hypervisor.h>
>  #include <asm/xen/hypercall.h>
>  #include <linux/module.h>
> @@ -58,6 +59,12 @@ int __init xen_guest_init(void)
>  	}
>  	xen_domain_type = XEN_HVM_DOMAIN;
>  
> +	xen_setup_features();
> +	if (xen_feature(XENFEAT_dom0))
> +		xen_start_info->flags |= SIF_INITDOMAIN|SIF_PRIVILEGED;
> +	else
> +		xen_start_info->flags &= ~(SIF_INITDOMAIN|SIF_PRIVILEGED);

What happens here on platforms prior to hypervisor changeset 23735?

> +
>  	/* already setup */
>  	if (shared_info_page != 0 && HYPERVISOR_shared_info == shared_info_page)
>  		return 0;
> diff --git a/include/xen/interface/features.h b/include/xen/interface/features.h
> index b6ca39a..131a6cc 100644
> --- a/include/xen/interface/features.h
> +++ b/include/xen/interface/features.h
> @@ -50,6 +50,9 @@
>  /* x86: pirq can be used by HVM guests */
>  #define XENFEAT_hvm_pirqs           10
>  
> +/* operation as Dom0 is supported */
> +#define XENFEAT_dom0                      11
> +
>  #define XENFEAT_NR_SUBMAPS 1
>  
>  #endif /* __XEN_PUBLIC_FEATURES_H__ */


--
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/