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Mon, 13 Jul 2020 23:27:20 -0700 (PDT) Date: Mon, 13 Jul 2020 23:27:20 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000049705905aa60e63e@google.com> Subject: KASAN: global-out-of-bounds Read in __xfrm6_tunnel_spi_lookup From: syzbot To: davem@davemloft.net, herbert@gondor.apana.org.au, kuba@kernel.org, kuznet@ms2.inr.ac.ru, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, steffen.klassert@secunet.com, syzkaller-bugs@googlegroups.com, yoshfuji@linux-ipv6.org Content-Type: text/plain; charset="UTF-8" Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Hello, syzbot found the following crash on: HEAD commit: be978f8f Add linux-next specific files for 20200713 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=11e79167100000 kernel config: https://syzkaller.appspot.com/x/.config?x=3fe4fccb94cbc1a6 dashboard link: https://syzkaller.appspot.com/bug?extid=cd59712012813594d659 compiler: gcc (GCC) 10.1.0-syz 20200507 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1430914f100000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1203e95d100000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+cd59712012813594d659@syzkaller.appspotmail.com IPVS: ftp: loaded support on port[0] = 21 ================================================================== BUG: KASAN: global-out-of-bounds in ipv6_addr_equal include/net/ipv6.h:579 [inline] BUG: KASAN: global-out-of-bounds in xfrm6_addr_equal include/net/xfrm.h:1699 [inline] BUG: KASAN: global-out-of-bounds in __xfrm6_tunnel_spi_lookup+0x367/0x3b0 net/ipv6/xfrm6_tunnel.c:82 Read of size 8 at addr ffffffff884ba1e0 by task syz-executor372/6812 CPU: 0 PID: 6812 Comm: syz-executor372 Not tainted 5.8.0-rc4-next-20200713-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x18f/0x20d lib/dump_stack.c:118 print_address_description.constprop.0.cold+0x5/0x497 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530 ipv6_addr_equal include/net/ipv6.h:579 [inline] xfrm6_addr_equal include/net/xfrm.h:1699 [inline] __xfrm6_tunnel_spi_lookup+0x367/0x3b0 net/ipv6/xfrm6_tunnel.c:82 xfrm6_tunnel_spi_lookup+0x8a/0x1d0 net/ipv6/xfrm6_tunnel.c:95 xfrmi6_rcv_tunnel+0xb9/0x100 net/xfrm/xfrm_interface.c:810 tunnel6_rcv+0xef/0x2b0 net/ipv6/tunnel6.c:148 ip6_protocol_deliver_rcu+0x2e8/0x1670 net/ipv6/ip6_input.c:433 ip6_input_finish+0x7f/0x160 net/ipv6/ip6_input.c:474 NF_HOOK include/linux/netfilter.h:307 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ip6_input+0x9c/0xd0 net/ipv6/ip6_input.c:483 ip6_mc_input+0x411/0xea0 net/ipv6/ip6_input.c:577 dst_input include/net/dst.h:449 [inline] ip6_rcv_finish net/ipv6/ip6_input.c:76 [inline] NF_HOOK include/linux/netfilter.h:307 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ipv6_rcv+0x28e/0x3c0 net/ipv6/ip6_input.c:307 __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:5287 __netif_receive_skb+0x27/0x1c0 net/core/dev.c:5401 netif_receive_skb_internal net/core/dev.c:5503 [inline] netif_receive_skb+0x159/0x990 net/core/dev.c:5562 tun_rx_batched.isra.0+0x460/0x720 drivers/net/tun.c:1518 tun_get_user+0x23b2/0x35b0 drivers/net/tun.c:1972 tun_chr_write_iter+0xba/0x151 drivers/net/tun.c:2001 call_write_iter include/linux/fs.h:1879 [inline] new_sync_write+0x422/0x650 fs/read_write.c:515 vfs_write+0x59d/0x6b0 fs/read_write.c:595 ksys_write+0x12d/0x250 fs/read_write.c:648 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x4013a0 Code: Bad RIP value. RSP: 002b:00007ffdf3de1d98 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004013a0 RDX: 000000000000005e RSI: 0000000020000ac0 RDI: 00000000000000f0 RBP: 00007ffdf3de1db0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 The buggy address belongs to the variable: psi_io_proc_ops+0xa0/0x4fe0 Memory state around the buggy address: ffffffff884ba080: 00 00 00 00 f9 f9 f9 f9 00 00 00 00 00 00 00 00 ffffffff884ba100: 00 00 00 00 f9 f9 f9 f9 00 00 00 00 00 00 00 00 >ffffffff884ba180: 00 00 00 00 f9 f9 f9 f9 00 00 01 f9 f9 f9 f9 f9 ^ ffffffff884ba200: 00 00 00 07 f9 f9 f9 f9 00 00 00 f9 f9 f9 f9 f9 ffffffff884ba280: 00 00 07 f9 f9 f9 f9 f9 00 00 00 02 f9 f9 f9 f9 ================================================================== --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches