CVE-2024-49947: In the Linux kernel, the following vulnerability has been resolved:  net: test for not too small csum_start in virtio_net_hdr_to_skb()  syzbot was able to trigger this warning [1], after injecting a malicious packet through af_packet, setting skb->csum_start and thus the transport header to an incorrect value.  We can at least make sure the transport header is after the end of the network header (with a estimated minimal size).  [1] [   67.873027] skb len=4096 headroom=16 headlen=14 tailroom=0 mac=(-1,-1) mac_len=0 net=(16,-6) trans=10 shinfo(txflags=0 nr_frags=1 gso(size=0 type=0 segs=0)) csum(0xa start=10 offset=0 ip_summed=3 complete_sw=0 valid=0 level=0) hash(0x0 sw=0 l4=0) proto=0x0800 pkttype=0 iif=0 priority=0x0 mark=0x0 alloc_cpu=10 vlan_all=0x0 encapsulation=0 inner(proto=0x0000, mac=0, net=0, trans=0) [   67.877172] dev name=veth0_vlan feat=0x000061164fdd09e9 [   67.877764] sk family=17 type=3 proto=0 [   67.878279] skb linear:   00000000: 00 00 10 00 00 00 00 00 0f 00 00 00 08 00 [   67.879128] skb frag:     00000000: 0e 00 07 00 00 00 28 00 08 80 1c 00 04 00 00 02 [   67.879877] skb frag:     00000010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [   67.880647] skb frag:     00000020: 00 00 02 00 00 00 08 00 1b 00 00 00 00 00 00 00 [   67.881156] skb frag:     00000030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [   67.881753] skb frag:     00000040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [   67.882173] skb frag:     00000050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [   67.882790] skb frag:     00000060: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [   67.883171] skb frag:     00000070: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [   67.883733] skb frag:     00000080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [   67.884206] skb frag:     00000090: 00 00 00 00 00 00 00 00 00 00 69 70 76 6c 61 6e [   67.884704] skb frag:     000000a0: 31 00 00 00 00 00 00 00 00 00 2b 00 00 00 00 00 [   67.885139] skb frag:     000000b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [   67.885677] skb frag:     000000c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [   67.886042] skb frag:     000000d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [   67.886408] skb frag:     000000e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [   67.887020] skb frag:     000000f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [   67.887384] skb frag:     00000100: 00 00 [   67.887878] ------------[ cut here ]------------ [   67.887908] offset (-6) >= skb_headlen() (14) [   67.888445] WARNING: CPU: 10 PID: 2088 at net/core/dev.c:3332 skb_checksum_help (net/core/dev.c:3332 (discriminator 2)) [   67.889353] Modules linked in: macsec macvtap macvlan hsr wireguard curve25519_x86_64 libcurve25519_generic libchacha20poly1305 chacha_x86_64 libchacha poly1305_x86_64 dummy bridge sr_mod cdrom evdev pcspkr i2c_piix4 9pnet_virtio 9p 9pnet netfs [   67.890111] CPU: 10 UID: 0 PID: 2088 Comm: b363492833 Not tainted 6.11.0-virtme #1011 [   67.890183] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [   67.890309] RIP: 0010:skb_checksum_help (net/core/dev.c:3332 (discriminator 2)) [   67.891043] Call Trace: [   67.891173]  <TASK> [   67.891274] ? __warn (kernel/panic.c:741) [   67.891320] ? skb_checksum_help (net/core/dev.c:3332 (discriminator 2)) [   67.891333] ? report_bug (lib/bug.c:180 lib/bug.c:219) [   67.891348] ? handle_bug (arch/x86/kernel/traps.c:239) [   67.891363] ? exc_invalid_op (arch/x86/kernel/traps.c:260 (discriminator 1)) [   67.891372] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:621) [   67.891388] ? skb_checksum_help (net/core/dev.c:3332 (discriminator 2)) [   67.891399] ? skb_checksum_help (net/core/dev.c:3332 (discriminator 2)) [   67.891416] ip_do_fragment (net/ipv4/ip_output.c:777 (discriminator 1)) [   67.891448] ? __ip_local_out (./include/linux/skbuff.h:1146 ./include/net/l3mdev.h:196 ./include/net/l3mdev.h:213 ne ---truncated---