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(static-72-81-132-2.bltmmd.fios.verizon.net [72.81.132.2]) by mx.zohomail.com with SMTPS id 1648667096871750.1941533014053; Wed, 30 Mar 2022 12:04:56 -0700 (PDT) X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 4e670fb0-b05c-11ec-a405-831a346695d4 ARC-Seal: i=1; a=rsa-sha256; t=1648667098; cv=none; d=zohomail.com; s=zohoarc; b=I8IHlShgYkhKa5I3J2yTRYG+M0XKPmdaxJWzBhuOES71D3stl8jxjCkIlFhPgoIo8U4hLtUpJNeI2eA1huxJQ4a6d0bNGIj23RucANz0xEGPxR7TEqlCxe3/jjOxw5HyHt2SIuNrloV1l5mI5Vr3B2qss/fMD59Kqtr1LVddLzU= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1648667098; h=Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:MIME-Version:Message-ID:References:Subject:To; bh=xQOPCqDVTdCL2p8rO8+lt5h9rYY5L4DAdcWEvMlILpc=; b=luLcV2MpRfAx3Q9MergmERIqb8fWR6K95maJnAo9qkKdj8Xb0jCFDligMpTjiYYxSk0GXywpLbbRYAGyRwlu1jFjSqDngHYch6xxjyGQjBtZKiW610XfxXi+W0/Vx7fEYYbg8gIi9QgEAvSItnQNENmj8hoxHA9vneoO2tTEz+0= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass header.i=apertussolutions.com; spf=pass smtp.mailfrom=dpsmith@apertussolutions.com; dmarc=pass header.from= DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; t=1648667098; s=zoho; d=apertussolutions.com; i=dpsmith@apertussolutions.com; h=From:From:To:To:Cc:Cc:Subject:Subject:Date:Message-Id:Message-Id:In-Reply-To:References:MIME-Version:Content-Transfer-Encoding:Reply-To; bh=xQOPCqDVTdCL2p8rO8+lt5h9rYY5L4DAdcWEvMlILpc=; b=lcUXJCMjU1RN/AekWEXGxAZz1CD5oOJAPf87B9IBcG7XENztAfFnl/NVJ6njPzbn Ym8fUsAB4EPNR/2ikx33xTQyB0tlEQv1hY66ufoxiWvdSN4ZHstqEtkwDqoLjGJRp+L s+5qO6vQovFOayEgp2vJSKYowBodypnzKuXAvl7Q= From: "Daniel P. Smith" To: xen-devel@lists.xenproject.org Cc: "Daniel P. Smith" , scott.davis@starlab.io, jandryuk@gmail.com, Daniel De Graaf Subject: [PATCH 1/2] xsm: add ability to elevate a domain to privileged Date: Wed, 30 Mar 2022 19:05:48 -0400 Message-Id: <20220330230549.26074-2-dpsmith@apertussolutions.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20220330230549.26074-1-dpsmith@apertussolutions.com> References: <20220330230549.26074-1-dpsmith@apertussolutions.com> MIME-Version: 1.0 X-ZohoMailClient: External There are now instances where internal hypervisor logic needs to make resource allocation calls that are protected by XSM checks. The internal hypervisor logic is represented a number of system domains which by designed are represented by non-privileged struct domain instances. To enable these logic blocks to function correctly but in a controlled manner, this commit introduces a pair of privilege escalation and demotion functions that will make a system domain privileged and then remove that privilege. Signed-off-by: Daniel P. Smith --- xen/include/xsm/xsm.h | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/xen/include/xsm/xsm.h b/xen/include/xsm/xsm.h index e22d6160b5..157e57151e 100644 --- a/xen/include/xsm/xsm.h +++ b/xen/include/xsm/xsm.h @@ -189,6 +189,28 @@ struct xsm_operations { #endif }; +static always_inline int xsm_elevate_priv(struct domain *d) +{ + if ( is_system_domain(d) ) + { + d->is_privileged = true; + return 0; + } + + return -EPERM; +} + +static always_inline int xsm_demote_priv(struct domain *d) +{ + if ( is_system_domain(d) ) + { + d->is_privileged = false; + return 0; + } + + return -EPERM; +} + #ifdef CONFIG_XSM extern struct xsm_operations *xsm_ops;