Bounce all data on the skbs to be transmitted into zeroed pages if the backend is untrusted. This avoids leaking data present in the pages shared with the backend but not part of the skb fragments. This requires introducing a new helper in order to allocate skbs with a size multiple of XEN_PAGE_SIZE so we don't leak contiguous data on the granted pages. Reporting whether the backend is to be trusted can be done using a module parameter, or from the xenstore frontend path as set by the toolstack when adding the device. This is CVE-2022-33741, part of XSA-403.
Unified · Split
| @@ -66,6 +66,10 @@ module_param_named(max_queues, xennet_max_queues, uint, 0644); · 65 unmodified lines | ||
| 66 | 66 | MODULE_PARM_DESC(max_queues, |
| 67 | 67 | "Maximum number of queues per virtual interface"); |
| 68 | 68 | |
| 69 | +static bool __read_mostly xennet_trusted = true; | |
| 70 | +module_param_named(trusted, xennet_trusted, bool, 0644); | |
| 71 | +MODULE_PARM_DESC(trusted, "Is the backend trusted"); | |
| 72 | + | |
| 69 | 73 | #define XENNET_TIMEOUT (5 * HZ) |
| 70 | 74 | |
| 71 | 75 | static const struct ethtool_ops xennet_ethtool_ops; |
| @@ -173,6 +177,9 @@ struct netfront_info { · 101 unmodified lines | ||
| 173 | 177 | /* Is device behaving sane? */ |
| 174 | 178 | bool broken; |
| 175 | 179 | |
| 180 | + /* Should skbs be bounced into a zeroed buffer? */ | |
| 181 | + bool bounce; | |
| 182 | + | |
| 176 | 183 | atomic_t rx_gso_checksum_fixup; |
| 177 | 184 | }; |
| 178 | 185 | |
| @@ -666,6 +673,33 @@ static int xennet_xdp_xmit(struct net_device *dev, int n, · 487 unmodified lines | ||
| 666 | 673 | return nxmit; |
| 667 | 674 | } |
| 668 | 675 | |
| 676 | +struct sk_buff *bounce_skb(const struct sk_buff *skb) | |
| 677 | +{ | |
| 678 | + unsigned int headerlen = skb_headroom(skb); | |
| 679 | + /* Align size to allocate full pages and avoid contiguous data leaks */ | |
| 680 | + unsigned int size = ALIGN(skb_end_offset(skb) + skb->data_len, | |
| 681 | + XEN_PAGE_SIZE); | |
| 682 | + struct sk_buff *n = alloc_skb(size, GFP_ATOMIC | __GFP_ZERO); | |
| 683 | + | |
| 684 | + if (!n) | |
| 685 | + return NULL; | |
| 686 | + | |
| 687 | + if (!IS_ALIGNED((uintptr_t)n->head, XEN_PAGE_SIZE)) { | |
| 688 | + WARN_ONCE(1, "misaligned skb allocated\n"); | |
| 689 | + kfree_skb(n); | |
| 690 | + return NULL; | |
| 691 | + } | |
| 692 | + | |
| 693 | + /* Set the data pointer */ | |
| 694 | + skb_reserve(n, headerlen); | |
| 695 | + /* Set the tail pointer and length */ | |
| 696 | + skb_put(n, skb->len); | |
| 697 | + | |
| 698 | + BUG_ON(skb_copy_bits(skb, -headerlen, n->head, headerlen + skb->len)); | |
| 699 | + | |
| 700 | + skb_copy_header(n, skb); | |
| 701 | + return n; | |
| 702 | +} | |
| 669 | 703 | |
| 670 | 704 | #define MAX_XEN_SKB_FRAGS (65536 / XEN_PAGE_SIZE + 1) |
| 671 | 705 | |
| @@ -719,9 +753,13 @@ static netdev_tx_t xennet_start_xmit(struct sk_buff *skb, struct net_device *dev · 47 unmodified lines | ||
| 719 | 753 | |
| 720 | 754 | /* The first req should be at least ETH_HLEN size or the packet will be |
| 721 | 755 | * dropped by netback. |
| 756 | + * | |
| 757 | + * If the backend is not trusted bounce all data to zeroed pages to | |
| 758 | + * avoid exposing contiguous data on the granted page not belonging to | |
| 759 | + * the skb. | |
| 722 | 760 | */ |
| 723 | − if (unlikely(PAGE_SIZE - offset < ETH_HLEN)) { | |
| 724 | − nskb = skb_copy(skb, GFP_ATOMIC); | |
| 761 | + if (np->bounce || unlikely(PAGE_SIZE - offset < ETH_HLEN)) { | |
| 762 | + nskb = bounce_skb(skb); | |
| 725 | 763 | if (!nskb) |
| 726 | 764 | goto drop; |
| 727 | 765 | dev_consume_skb_any(skb); |
| @@ -2215,6 +2253,10 @@ static int talk_to_netback(struct xenbus_device *dev, · 1487 unmodified lines | ||
| 2215 | 2253 | |
| 2216 | 2254 | info->netdev->irq = 0; |
| 2217 | 2255 | |
| 2256 | + /* Check if backend is trusted. */ | |
| 2257 | + info->bounce = !xennet_trusted || | |
| 2258 | + !xenbus_read_unsigned(dev->nodename, "trusted", 1); | |
| 2259 | + | |
| 2218 | 2260 | /* Check if backend supports multiple queues */ |
| 2219 | 2261 | max_queues = xenbus_read_unsigned(info->xbdev->otherend, |
| 2220 | 2262 | "multi-queue-max-queues", 1); |
| @@ -2382,6 +2424,9 @@ static int xennet_connect(struct net_device *dev) · 161 unmodified lines | ||
| 2382 | 2424 | return err; |
| 2383 | 2425 | if (np->netback_has_xdp_headroom) |
| 2384 | 2426 | pr_info("backend supports XDP headroom\n"); |
| 2427 | + if (np->bounce) | |
| 2428 | + dev_info(&np->xbdev->dev, | |
| 2429 | + "bouncing transmitted data to zeroed pages\n"); | |
| 2385 | 2430 | |
| 2386 | 2431 | /* talk_to_netback() sets the correct number of queues */ |
| 2387 | 2432 | num_queues = dev->real_num_tx_queues; |