From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 85F95745D6; Tue, 23 Jan 2024 02:04:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705975474; cv=none; b=ae/CjodIgFx59HUFHAy/AQFIXJk0geD3V8ZbkCqSiauRUEL8ZkkB5IGrJZeYvJPkBrzZZV+nLk+4ZxxYBA95cLPh2GFskgpjsY2l2IwyLZQkrx38LAG8tUbmfxhNnjQ0sk7ZRkDe5AUMh3pUE7eQW6Ro6MJGPy+kVkRhEJRJyfc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705975474; c=relaxed/simple; bh=JbcoKEETEXgGV8bhjPMGIqAJn7Dn0S6vCE8Mr+aepE0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=PAN2v8t6UMqbwMXJe4vv4QIADLjOBjBHqUW9+DEWHW9Y5Q6X5j3cSBuKOqhz9kcvBkHMnAEAI8j4mkNljciJGX+u3hyF9ajtq/BMyqkUxjUPFtoyhJh+ZvFQGxQ77PCe3KgHbFHAECdMkwe997cdcZEmH8GbV5i020z4qdw61FU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=OOTGHZT3; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="OOTGHZT3" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 47992C433F1; Tue, 23 Jan 2024 02:04:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1705975474; bh=JbcoKEETEXgGV8bhjPMGIqAJn7Dn0S6vCE8Mr+aepE0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=OOTGHZT3B4E/yfkXBm7vLm5Ki40+04i77IiD/z1H5zRMeMqJhGWtg0ROKYcRN+E2F RfbvwZMUvHG/mNZNShu8LCSRhGWBvz58E1csupcOB8Wq6ps0kctnVj5qtmFNIrBpkz oez/dHi9qhcSGup3BWdmHTDenMhJQj4LTGE3zYPY= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Oliver Upton , Marc Zyngier Subject: [PATCH 6.6 429/583] KVM: arm64: vgic-its: Avoid potential UAF in LPI translation cache Date: Mon, 22 Jan 2024 15:58:00 -0800 Message-ID: <20240122235825.114135159@linuxfoundation.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240122235812.238724226@linuxfoundation.org> References: <20240122235812.238724226@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Oliver Upton commit ad362fe07fecf0aba839ff2cc59a3617bd42c33f upstream. There is a potential UAF scenario in the case of an LPI translation cache hit racing with an operation that invalidates the cache, such as a DISCARD ITS command. The root of the problem is that vgic_its_check_cache() does not elevate the refcount on the vgic_irq before dropping the lock that serializes refcount changes. Have vgic_its_check_cache() raise the refcount on the returned vgic_irq and add the corresponding decrement after queueing the interrupt. Cc: stable@vger.kernel.org Signed-off-by: Oliver Upton Signed-off-by: Marc Zyngier Link: https://lore.kernel.org/r/20240104183233.3560639-1-oliver.upton@linux.dev Signed-off-by: Greg Kroah-Hartman --- arch/arm64/kvm/vgic/vgic-its.c | 5 +++++ 1 file changed, 5 insertions(+) --- a/arch/arm64/kvm/vgic/vgic-its.c +++ b/arch/arm64/kvm/vgic/vgic-its.c @@ -584,7 +584,11 @@ static struct vgic_irq *vgic_its_check_c unsigned long flags; raw_spin_lock_irqsave(&dist->lpi_list_lock, flags); + irq = __vgic_its_check_cache(dist, db, devid, eventid); + if (irq) + vgic_get_irq_kref(irq); + raw_spin_unlock_irqrestore(&dist->lpi_list_lock, flags); return irq; @@ -763,6 +767,7 @@ int vgic_its_inject_cached_translation(s raw_spin_lock_irqsave(&irq->irq_lock, flags); irq->pending_latch = true; vgic_queue_irq_unlock(kvm, irq, flags); + vgic_put_irq(kvm, irq); return 0; }