lkl: Add config option for MAC address #65
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This makes life slightly easier when running tests that require using LKL on the server side and restarting it many times, since it doesn't confuse ARP when its IP becomes associated with a new, randomly-generated MAC. Signed-off-by: Patrick Collins <pscollins@google.com>
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LGTM. +1. |
ghost
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Feb 6, 2016
lkl: Add config option for MAC address
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thehajime
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May 15, 2016
When sending a UDPv6 message longer than MTU, account for the length of fragmentable IPv6 extension headers in skb->network_header offset. Same as we do in alloc_new_skb path in __ip6_append_data(). This ensures that later on __ip6_make_skb() will make space in headroom for fragmentable extension headers: /* move skb->data to ip header from ext header */ if (skb->data < skb_network_header(skb)) __skb_pull(skb, skb_network_offset(skb)); Prevents a splat due to skb_under_panic: skbuff: skb_under_panic: text:ffffffff8143397b len:2126 put:14 \ head:ffff880005bacf50 data:ffff880005bacf4a tail:0x48 end:0xc0 dev:lo ------------[ cut here ]------------ kernel BUG at net/core/skbuff.c:104! invalid opcode: 0000 [#1] KASAN CPU: 0 PID: 160 Comm: reproducer Not tainted 4.6.0-rc2 lkl#65 [...] Call Trace: [<ffffffff813eb7b9>] skb_push+0x79/0x80 [<ffffffff8143397b>] eth_header+0x2b/0x100 [<ffffffff8141e0d0>] neigh_resolve_output+0x210/0x310 [<ffffffff814eab77>] ip6_finish_output2+0x4a7/0x7c0 [<ffffffff814efe3a>] ip6_output+0x16a/0x280 [<ffffffff815440c1>] ip6_local_out+0xb1/0xf0 [<ffffffff814f1115>] ip6_send_skb+0x45/0xd0 [<ffffffff81518836>] udp_v6_send_skb+0x246/0x5d0 [<ffffffff8151985e>] udpv6_sendmsg+0xa6e/0x1090 [...] Reported-by: Ji Jianwen <jiji@redhat.com> Signed-off-by: Jakub Sitnicki <jkbs@redhat.com> Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: David S. Miller <davem@davemloft.net>
boat0
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May 18, 2018
The l2tp_tunnel_create() function checks for v4mapped ipv6 sockets and cache that flag, so that l2tp core code can reusing it at xmit time. If the socket is provided by the userspace, the connection status of the tunnel sockets can change between the tunnel creation and the xmit call, so that syzbot is able to trigger the following splat: BUG: KASAN: use-after-free in ip6_dst_idev include/net/ip6_fib.h:192 [inline] BUG: KASAN: use-after-free in ip6_xmit+0x1f76/0x2260 net/ipv6/ip6_output.c:264 Read of size 8 at addr ffff8801bd949318 by task syz-executor4/23448 CPU: 0 PID: 23448 Comm: syz-executor4 Not tainted 4.16.0-rc4+ lkl#65 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x24d lib/dump_stack.c:53 print_address_description+0x73/0x250 mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report+0x23c/0x360 mm/kasan/report.c:412 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 ip6_dst_idev include/net/ip6_fib.h:192 [inline] ip6_xmit+0x1f76/0x2260 net/ipv6/ip6_output.c:264 inet6_csk_xmit+0x2fc/0x580 net/ipv6/inet6_connection_sock.c:139 l2tp_xmit_core net/l2tp/l2tp_core.c:1053 [inline] l2tp_xmit_skb+0x105f/0x1410 net/l2tp/l2tp_core.c:1148 pppol2tp_sendmsg+0x470/0x670 net/l2tp/l2tp_ppp.c:341 sock_sendmsg_nosec net/socket.c:630 [inline] sock_sendmsg+0xca/0x110 net/socket.c:640 ___sys_sendmsg+0x767/0x8b0 net/socket.c:2046 __sys_sendmsg+0xe5/0x210 net/socket.c:2080 SYSC_sendmsg net/socket.c:2091 [inline] SyS_sendmsg+0x2d/0x50 net/socket.c:2087 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x453e69 RSP: 002b:00007f819593cc68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f819593d6d4 RCX: 0000000000453e69 RDX: 0000000000000081 RSI: 000000002037ffc8 RDI: 0000000000000004 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000004c3 R14: 00000000006f72e8 R15: 0000000000000000 This change addresses the issues: * explicitly checking for TCP_ESTABLISHED for user space provided sockets * dropping the v4mapped flag usage - it can become outdated - and explicitly invoking ipv6_addr_v4mapped() instead The issue is apparently there since ancient times. v1 -> v2: (many thanks to Guillaume) - with csum issue introduced in v1 - replace pr_err with pr_debug - fix build issue with IPV6 disabled - move l2tp_sk_is_v4mapped in l2tp_core.c v2 -> v3: - don't update inet_daddr for v4mapped address, unneeded - drop rendundant check at creation time Reported-and-tested-by: syzbot+92fa328176eb07e4ac1a@syzkaller.appspotmail.com Fixes: 3557baa ("[L2TP]: PPP over L2TP driver core") Signed-off-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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This makes life slightly easier when running tests that require using
LKL on the server side and restarting it many times, since it doesn't
confuse ARP when its IP becomes associated with a new,
randomly-generated MAC.
Signed-off-by: Patrick Collins pscollins@google.com