제가 운영하고 있는 서버는 ssh(22) 와 ftp(21) 만을 열어두고 있습니다.
그런데 2일 오전에 ssh 접속을 하려고 하였는데 아이디와 암호는 물어보
는데 쉘은 안떨어지더군요. ftp 도 마찬가지고 였습니다.
ping 을 해보니 host 는 살아 있었습니다.
log 로 보니 아래에 적은 부분이 이해가 안되서 올립니다.
지금 쓰고 있는 proftp 버전은 1.2.1 이고요 1.2.4 로 업할 예정입니다.
---------------------------------------------------------------------
Mar 1 01:55:30 thrucomnet kernel: Unable to handle kernel NULL pointer dereference at virtual address 00000000
Mar 1 01:55:30 thrucomnet kernel: printing eip:
Mar 1 01:55:30 thrucomnet kernel: c015e520
Mar 1 01:55:30 thrucomnet kernel: pgd entry f48e1000: 0000000000000000
Mar 1 01:55:30 thrucomnet kernel: pmd entry f48e1000: 0000000000000000
Mar 1 01:55:30 thrucomnet kernel: ... pmd not present!
Mar 1 01:55:30 thrucomnet kernel: Oops:0002
Mar 1 01:55:30 thrucomnet kernel: CPU: 1
Mar 1 01:55:30 thrucomnet kernel: EIP: 0010:[ext2_new_block+1360/3168]
Mar 1 01:55:30 thrucomnet kernel: EIP: 0010:[<c015e520>]
Mar 1 01:55:30 thrucomnet kernel: EFLAGS:00010246
Mar 1 01:55:30 thrucomnet kernel: eax: 00000000 ebx: f7757400 ecx: 8b000dd9 edx: d4b08000
Mar 1 01:55:30 thrucomnet kernel: esi: 000026f7 edi: f7757400 ebp: 000026f7 esp: ef915d20
Mar 1 01:55:30 thrucomnet kernel: ds: 0018 es: 0018 ss: 0018
Mar 1 01:55:30 thrucomnet kernel: Process proftpd (pid: 5217, stackpage=ef915000)
Mar 1 01:55:30 thrucomnet kernel: Stack: ef915d24 00000286 ec2cf000 f73766c0 ef915d64 f73766c0 f7b2a140 ebf6f120
Mar 1 01:55:30 thrucomnet kernel: ebf6f120 ebf6f120 c01e8c6c f7a7c400 f7a7b300 f7757400 c01e8dff 00000018
Mar 1 01:55:30 thrucomnet kernel: f73766c0 f7a5e600 ebf6f120 c010aa1e 00000001 c0356068 f18357e0 000c26f7
Mar 1 01:55:30 thrucomnet kernel: Call Trace: [kfree_skbmem+12/112] [__kfree_skb+303/320] [handle_IRQ_event+94/144] [e
xt2_alloc_block+115/128] [ext2_alloc_branch+48/528] [__generic_copy_to_user+48/64] [ext2_get_block+857/1344] Mar 1 01:
55:30 thrucomnet kernel: Call Trace: [<c01e8c6c>] [<c01e8dff>] [<c010aa1e>] [<c0160123>] [<c0160290>] [<c02364c0>] [<c01
607c9>] Mar 1 01:55:30 thrucomnet kernel: [kfree_skbmem+12/112] [create_empty_buffers+25/112] [__block_prep
are_write+295/800] [add_to_page_cache_unique+236/256] [block_prepare_write+34/128] [ext2_get_block+0/1344] [generic_file
_write+942/1616] [ext2_get_block+0/1344] Mar 1 01:55:30 thrucomnet kernel: [<c01e8c6c>] [<c013cc29>] [<c013
d077>] [<c012a3fc>] [<c013da42>] [<c0160470>] [<c012d47e>] [<c0160470>] Mar 1 01:55:30 thrucomnet kernel: [
do_getitimer+161/176] [sys_write+150/208] [sys_alarm+50/80] [system_call+51/56] [startup_32+43/203] Mar 1 01:55:30 thr
ucomnet kernel: [<c011c981>] [<c013a496>] [<c01213e2>] [<c01091cb>] [<c010002b>] Mar 1 01:55:30 thrucomnet
kernel: Mar 1 01:55:30 thrucomnet kernel: Code:00 00 00 31 f6 8b 87 90 00 00 00 bf 00 e0 ff ff 0f b6 48 10 ---------
----------------------------------------------------------------------- 이게 무슨 뜻인지 아시는 분은 답변
부탁드립니다. 참고로 tcpwrapper 문제는 아닙니다.