Hi Xie, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on linus/master] [also build test WARNING on v5.13-rc3 next-20210525] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Xie-Yongji/virtio-net-Add-validation-for-used-length/20210525-130449 base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git a050a6d2b7e80ca52b2f4141eaf3420d201b72b3 config: x86_64-randconfig-a005-20210525 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 99155e913e9bad5f7f8a247f8bb3a3ff3da74af1) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # https://github.com/0day-ci/linux/commit/9cacb0e306acf93325699401dcae01f77505f017 git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Xie-Yongji/virtio-net-Add-validation-for-used-length/20210525-130449 git checkout 9cacb0e306acf93325699401dcae01f77505f017 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): >> drivers/net/virtio_net.c:740:22: warning: format specifies type 'unsigned long' but the argument has type 'int' [-Wformat] dev->name, len, GOOD_PACKET_LEN); ^~~~~~~~~~~~~~~ include/linux/printk.h:424:26: note: expanded from macro 'pr_debug' dynamic_pr_debug(fmt, ##__VA_ARGS__) ~~~ ^~~~~~~~~~~ include/linux/dynamic_debug.h:163:22: note: expanded from macro 'dynamic_pr_debug' pr_fmt(fmt), ##__VA_ARGS__) ~~~ ^~~~~~~~~~~ include/linux/dynamic_debug.h:152:56: note: expanded from macro '_dynamic_func_call' __dynamic_func_call(__UNIQUE_ID(ddebug), fmt, func, ##__VA_ARGS__) ^~~~~~~~~~~ include/linux/dynamic_debug.h:134:15: note: expanded from macro '__dynamic_func_call' func(&id, ##__VA_ARGS__); \ ^~~~~~~~~~~ drivers/net/virtio_net.c:35:25: note: expanded from macro 'GOOD_PACKET_LEN' #define GOOD_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ drivers/net/virtio_net.c:820:21: warning: format specifies type 'unsigned long' but the argument has type 'int' [-Wformat] dev->name, len, GOOD_PACKET_LEN); ^~~~~~~~~~~~~~~ include/linux/printk.h:424:26: note: expanded from macro 'pr_debug' dynamic_pr_debug(fmt, ##__VA_ARGS__) ~~~ ^~~~~~~~~~~ include/linux/dynamic_debug.h:163:22: note: expanded from macro 'dynamic_pr_debug' pr_fmt(fmt), ##__VA_ARGS__) ~~~ ^~~~~~~~~~~ include/linux/dynamic_debug.h:152:56: note: expanded from macro '_dynamic_func_call' __dynamic_func_call(__UNIQUE_ID(ddebug), fmt, func, ##__VA_ARGS__) ^~~~~~~~~~~ include/linux/dynamic_debug.h:134:15: note: expanded from macro '__dynamic_func_call' func(&id, ##__VA_ARGS__); \ ^~~~~~~~~~~ drivers/net/virtio_net.c:35:25: note: expanded from macro 'GOOD_PACKET_LEN' #define GOOD_PACKET_LEN (ETH_HLEN + VLAN_HLEN + ETH_DATA_LEN) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 2 warnings generated. vim +740 drivers/net/virtio_net.c 704 705 static struct sk_buff *receive_small(struct net_device *dev, 706 struct virtnet_info *vi, 707 struct receive_queue *rq, 708 void *buf, void *ctx, 709 unsigned int len, 710 unsigned int *xdp_xmit, 711 struct virtnet_rq_stats *stats) 712 { 713 struct sk_buff *skb; 714 struct bpf_prog *xdp_prog; 715 unsigned int xdp_headroom = (unsigned long)ctx; 716 unsigned int header_offset = VIRTNET_RX_PAD + xdp_headroom; 717 unsigned int headroom = vi->hdr_len + header_offset; 718 unsigned int buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) + 719 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); 720 struct page *page = virt_to_head_page(buf); 721 unsigned int delta = 0; 722 struct page *xdp_page; 723 int err; 724 unsigned int metasize = 0; 725 726 len -= vi->hdr_len; 727 stats->bytes += len; 728 729 rcu_read_lock(); 730 xdp_prog = rcu_dereference(rq->xdp_prog); 731 if (xdp_prog) { 732 struct virtio_net_hdr_mrg_rxbuf *hdr = buf + header_offset; 733 struct xdp_frame *xdpf; 734 struct xdp_buff xdp; 735 void *orig_data; 736 u32 act; 737 738 if (unlikely(len > GOOD_PACKET_LEN)) { 739 pr_debug("%s: rx error: len %u exceeds max size %lu\n", > 740 dev->name, len, GOOD_PACKET_LEN); 741 dev->stats.rx_length_errors++; 742 goto err_xdp; 743 } 744 745 if (unlikely(hdr->hdr.gso_type)) 746 goto err_xdp; 747 748 if (unlikely(xdp_headroom < virtnet_get_headroom(vi))) { 749 int offset = buf - page_address(page) + header_offset; 750 unsigned int tlen = len + vi->hdr_len; 751 u16 num_buf = 1; 752 753 xdp_headroom = virtnet_get_headroom(vi); 754 header_offset = VIRTNET_RX_PAD + xdp_headroom; 755 headroom = vi->hdr_len + header_offset; 756 buflen = SKB_DATA_ALIGN(GOOD_PACKET_LEN + headroom) + 757 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); 758 xdp_page = xdp_linearize_page(rq, &num_buf, page, 759 offset, header_offset, 760 &tlen); 761 if (!xdp_page) 762 goto err_xdp; 763 764 buf = page_address(xdp_page); 765 put_page(page); 766 page = xdp_page; 767 } 768 769 xdp_init_buff(&xdp, buflen, &rq->xdp_rxq); 770 xdp_prepare_buff(&xdp, buf + VIRTNET_RX_PAD + vi->hdr_len, 771 xdp_headroom, len, true); 772 orig_data = xdp.data; 773 act = bpf_prog_run_xdp(xdp_prog, &xdp); 774 stats->xdp_packets++; 775 776 switch (act) { 777 case XDP_PASS: 778 /* Recalculate length in case bpf program changed it */ 779 delta = orig_data - xdp.data; 780 len = xdp.data_end - xdp.data; 781 metasize = xdp.data - xdp.data_meta; 782 break; 783 case XDP_TX: 784 stats->xdp_tx++; 785 xdpf = xdp_convert_buff_to_frame(&xdp); 786 if (unlikely(!xdpf)) 787 goto err_xdp; 788 err = virtnet_xdp_xmit(dev, 1, &xdpf, 0); 789 if (unlikely(!err)) { 790 xdp_return_frame_rx_napi(xdpf); 791 } else if (unlikely(err < 0)) { 792 trace_xdp_exception(vi->dev, xdp_prog, act); 793 goto err_xdp; 794 } 795 *xdp_xmit |= VIRTIO_XDP_TX; 796 rcu_read_unlock(); 797 goto xdp_xmit; 798 case XDP_REDIRECT: 799 stats->xdp_redirects++; 800 err = xdp_do_redirect(dev, &xdp, xdp_prog); 801 if (err) 802 goto err_xdp; 803 *xdp_xmit |= VIRTIO_XDP_REDIR; 804 rcu_read_unlock(); 805 goto xdp_xmit; 806 default: 807 bpf_warn_invalid_xdp_action(act); 808 fallthrough; 809 case XDP_ABORTED: 810 trace_xdp_exception(vi->dev, xdp_prog, act); 811 goto err_xdp; 812 case XDP_DROP: 813 goto err_xdp; 814 } 815 } 816 rcu_read_unlock(); 817 818 if (unlikely(len > GOOD_PACKET_LEN)) { 819 pr_debug("%s: rx error: len %u exceeds max size %lu\n", 820 dev->name, len, GOOD_PACKET_LEN); 821 dev->stats.rx_length_errors++; 822 put_page(page); 823 return NULL; 824 } 825 826 skb = build_skb(buf, buflen); 827 if (!skb) { 828 put_page(page); 829 goto err; 830 } 831 skb_reserve(skb, headroom - delta); 832 skb_put(skb, len); 833 if (!xdp_prog) { 834 buf += header_offset; 835 memcpy(skb_vnet_hdr(skb), buf, vi->hdr_len); 836 } /* keep zeroed vnet hdr since XDP is loaded */ 837 838 if (metasize) 839 skb_metadata_set(skb, metasize); 840 841 err: 842 return skb; 843 844 err_xdp: 845 rcu_read_unlock(); 846 stats->xdp_drops++; 847 stats->drops++; 848 put_page(page); 849 xdp_xmit: 850 return NULL; 851 } 852 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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