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 AFCBC1D4154; Tue, 15 Oct 2024 11:50:18 +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=1728993018; cv=none; b=TL2uU85JnBW/KPad0AI/KaUOtwir8BlpumX1YkAoriHyYYWgq1LmzEFsTuIg3rb1vCP5CA5ORZhPVTcE2CwrtGc2EcwiClXjIkEF/9qXy3qeMK5oWeItQ/4QjC2eSHCWjsaTamzfmfB0+Yh0jDXcIZM8sr0lNA7DGTYsOb4kB5k= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728993018; c=relaxed/simple; bh=W32hfL0m2bL8+PvxO+YTwmv/IZvYovztD96jEBaFHAo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=G+oVtHN4iWdKZCoaF83gCcTD8NemiJyNPENeACSINAyKAMt3ElmcUxzO3Ix3zxukaqgeFDM7RwZB7v6elG0GVChfnv0BygyynlzlCGVTIRjQyQb+jPJLaK+Et9dGB4bBqlhWRvD2MeWBsg1JeTHudzGLWkaKcWO/hQb1sML0iQA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=LavqkVYg; 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="LavqkVYg" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 213ACC4CEC6; Tue, 15 Oct 2024 11:50:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1728993018; bh=W32hfL0m2bL8+PvxO+YTwmv/IZvYovztD96jEBaFHAo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LavqkVYgVqKHrkUqF6l09MPz0UfzEzyUltrb/maX/GnQ4xxDaCFmwsJEOxXN57fhD nXpS8N12Riqsmigs+gXP0BWakoy1vERNZ099gsVwa+G6AbjEmB84Wt4h2xCDYKbIbi X3wTMN3u3wGPqU7fmmxFduCOlt/1VACY3djKgqZA= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Dragos Tatulea , Jason Wang , "Michael S. Tsirkin" , Sasha Levin Subject: [PATCH 5.15 279/691] vhost_vdpa: assign irq bypass producer token correctly Date: Tue, 15 Oct 2024 13:23:47 +0200 Message-ID: <20241015112451.418953511@linuxfoundation.org> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20241015112440.309539031@linuxfoundation.org> References: <20241015112440.309539031@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jason Wang [ Upstream commit 02e9e9366fefe461719da5d173385b6685f70319 ] We used to call irq_bypass_unregister_producer() in vhost_vdpa_setup_vq_irq() which is problematic as we don't know if the token pointer is still valid or not. Actually, we use the eventfd_ctx as the token so the life cycle of the token should be bound to the VHOST_SET_VRING_CALL instead of vhost_vdpa_setup_vq_irq() which could be called by set_status(). Fixing this by setting up irq bypass producer's token when handling VHOST_SET_VRING_CALL and un-registering the producer before calling vhost_vring_ioctl() to prevent a possible use after free as eventfd could have been released in vhost_vring_ioctl(). And such registering and unregistering will only be done if DRIVER_OK is set. Reported-by: Dragos Tatulea Tested-by: Dragos Tatulea Reviewed-by: Dragos Tatulea Fixes: 2cf1ba9a4d15 ("vhost_vdpa: implement IRQ offloading in vhost_vdpa") Signed-off-by: Jason Wang Message-Id: <20240816031900.18013-1-jasowang@redhat.com> Signed-off-by: Michael S. Tsirkin Signed-off-by: Sasha Levin --- drivers/vhost/vdpa.c | 16 +++++++++++++--- 1 file changed, 13 insertions(+), 3 deletions(-) diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c index 1dc11ba0922d2..58ba684037f9e 100644 --- a/drivers/vhost/vdpa.c +++ b/drivers/vhost/vdpa.c @@ -100,11 +100,9 @@ static void vhost_vdpa_setup_vq_irq(struct vhost_vdpa *v, u16 qid) if (irq < 0) return; - irq_bypass_unregister_producer(&vq->call_ctx.producer); if (!vq->call_ctx.ctx) return; - vq->call_ctx.producer.token = vq->call_ctx.ctx; vq->call_ctx.producer.irq = irq; ret = irq_bypass_register_producer(&vq->call_ctx.producer); if (unlikely(ret)) @@ -401,6 +399,14 @@ static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd, vq->last_avail_idx = vq_state.split.avail_index; } break; + case VHOST_SET_VRING_CALL: + if (vq->call_ctx.ctx) { + if (ops->get_status(vdpa) & + VIRTIO_CONFIG_S_DRIVER_OK) + vhost_vdpa_unsetup_vq_irq(v, idx); + vq->call_ctx.producer.token = NULL; + } + break; } r = vhost_vring_ioctl(&v->vdev, cmd, argp); @@ -433,13 +439,16 @@ static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd, cb.callback = vhost_vdpa_virtqueue_cb; cb.private = vq; cb.trigger = vq->call_ctx.ctx; + vq->call_ctx.producer.token = vq->call_ctx.ctx; + if (ops->get_status(vdpa) & + VIRTIO_CONFIG_S_DRIVER_OK) + vhost_vdpa_setup_vq_irq(v, idx); } else { cb.callback = NULL; cb.private = NULL; cb.trigger = NULL; } ops->set_vq_cb(vdpa, idx, &cb); - vhost_vdpa_setup_vq_irq(v, idx); break; case VHOST_SET_VRING_NUM: @@ -990,6 +999,7 @@ static int vhost_vdpa_open(struct inode *inode, struct file *filep) for (i = 0; i < nvqs; i++) { vqs[i] = &v->vqs[i]; vqs[i]->handle_kick = handle_vq_kick; + vqs[i]->call_ctx.ctx = NULL; } vhost_dev_init(dev, vqs, nvqs, 0, 0, 0, false, vhost_vdpa_process_iotlb_msg); -- 2.43.0