linux-kernel - [PATCH v5 4/5] KVM: irqfd: use kvm_arch_is_virtual_intc

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: <1417622832-5460-5-git-send-email-eric.auger@linaro.org>
Date:	Wed,  3 Dec 2014 17:07:11 +0100
From:	Eric Auger <eric.auger@...aro.org>
To:	eric.auger@...com, eric.auger@...aro.org,
	christoffer.dall@...aro.org, marc.zyngier@....com,
	linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
	kvm@...r.kernel.org, alex.williamson@...hat.com, agraf@...e.de,
	joel.schopp@....com, gleb@...nel.org, pbonzini@...hat.com,
	borntraeger@...ibm.com, cornelia.huck@...ibm.com
Cc:	linux-kernel@...r.kernel.org, patches@...aro.org,
	a.motakis@...tualopensystems.com
Subject: [PATCH v5 4/5] KVM: irqfd: use kvm_arch_is_virtual_intc_initialized

On arm/arm64, the interrupt controller is dynamically instantiated.
There is a risk the user-space assigns an irqfd before this latter
is initialized and ready to accept virtual irq injection. On such
attempt, the IRQFD setup is rejected and -EAGAIN is returned.

Signed-off-by: Eric Auger <eric.auger@...aro.org>
---
 virt/kvm/eventfd.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c
index b0fb390..f837c83 100644
--- a/virt/kvm/eventfd.c
+++ b/virt/kvm/eventfd.c
@@ -314,6 +314,9 @@ kvm_irqfd_assign(struct kvm *kvm, struct kvm_irqfd *args)
 	unsigned int events;
 	int idx;
 
+	if (!kvm_arch_is_virtual_intc_initialized(kvm))
+		return -EAGAIN;
+
 	irqfd = kzalloc(sizeof(*irqfd), GFP_KERNEL);
 	if (!irqfd)
 		return -ENOMEM;
-- 
1.9.1

--
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/