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Package: proftpd-basic
Version: 1.3.1-17lenny1
Bug:
Proftpd is up and running. Connections are possible from remote and local,
but session is closed direct after connect (even before Server ist ready
message).
Syslog tells on connect:
jonathan kernel: proftpd[8904] general protection rip:2b1a87d33c98
rsp:ff17fdd575018919 error:0
strace tells (strace proftpd -nd6):
clone(jonathan.xxxxxx (yyy.yyy.yyy.yyy[zzz.zzz.zzz.zzz]) - FTP session
requested from unknown class
child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD,
child_tidptr=0x2af5c1409200) = 9208
close(7) = 0
time([1235909534]) = 1235909534
close(9) = 0
rt_sigprocmask(SIG_UNBLOCK, [USR1 USR2 TERM CHLD], NULL, 8) = 0
fcntl(1, F_GETFL) = 0x802 (flags O_RDWR|O_NONBLOCK)
fcntl(1, F_SETFL, O_RDWR) = 0
lstat("/etc/shutmsg", 0x7fffea765640) = -1 ENOENT (No such file or
directory)
select(9, [1 8], NULL, NULL, {30, 0}) = 1 (in [8], left {30, 0})
time(NULL) = 1235909534
close(8) = 0
lstat("/etc/shutmsg", 0x7fffea765640) = -1 ENOENT (No such file or
directory)
select(2, [1], NULL, NULL, {30, 0}) = ? ERESTARTNOHAND (To be restarted)
--- SIGCHLD (Child exited) @ 0 (0) ---
rt_sigprocmask(SIG_BLOCK, [TERM CHLD], NULL, 8) = 0
wait4(-1, NULL, WNOHANG, NULL) = 9208
wait4(-1, NULL, WNOHANG, NULL) = -1 ECHILD (No child processes)
rt_sigprocmask(SIG_UNBLOCK, [TERM CHLD], NULL, 8) = 0
rt_sigaction(SIGCHLD, {0x40d700, [CHLD], SA_RESTORER|SA_RESTART,
0x2af5c10e6f60}, {0x40d700, [CHLD], SA_RESTORER|SA_RESTART, 0x2af5c10e6f60},
8) = 0
rt_sigreturn(0x11) = -1 EINTR (Interrupted system call)
rt_sigprocmask(SIG_BLOCK, [TERM CHLD], NULL, 8) = 0
wait4(-1, NULL, WNOHANG, NULL) = -1 ECHILD (No child processes)
rt_sigprocmask(SIG_UNBLOCK, [TERM CHLD], NULL, 8) = 0
lstat("/etc/shutmsg", 0x7fffea765640) = -1 ENOENT (No such file or
directory)
select(2, [1], NULL, NULL, {30, 0}) = ? ERESTARTNOHAND (To be restarted)
--- SIGALRM (Alarm clock) @ 0 (0) ---
rt_sigaction(SIGALRM, {0x414120, [], SA_RESTORER|SA_INTERRUPT,
0x2af5c10e6f60}, NULL, 8) = 0
rt_sigaction(SIGALRM, NULL, {0x414120, [], SA_RESTORER|SA_INTERRUPT,
0x2af5c10e6f60}, 8) = 0
rt_sigaction(SIGALRM, {0x414120, [], SA_RESTORER|SA_INTERRUPT,
0x2af5c10e6f60}, NULL, 8) = 0
time(NULL) = 1235909542
alarm(10) = 0
rt_sigreturn(0xa) = -1 EINTR (Interrupted system call)
alarm(0) = 10
time(NULL) = 1235909542
select(6, [4], NULL, NULL, {0, 500}) = 0 (Timeout)
time(NULL) = 1235909542
alarm(10) = 0
lstat("/etc/shutmsg", 0x7fffea765640) = -1 ENOENT (No such file or
directory)
select(2, [1], NULL, NULL, {30, 0}
Proftpd-Log tells on connect:
Mär 01 13:13:03 mod_sql/4.2.2[9246]: defaulting to 'postgres' backend
Mär 01 13:13:03 mod_sql/4.2.2[9246]: backend module 'mod_sql_postgres/4.0.4'
Mär 01 13:13:03 mod_sql/4.2.2[9246]: backend api 'mod_sql_api_v1'
Mär 01 13:13:03 mod_sql/4.2.2[9246]: >>> sql_sess_init
Mär 01 13:13:03 mod_sql/4.2.2[9246]: entering postgres
cmd_defineconnection
Mär 01 13:13:03 mod_sql/4.2.2[9246]: name: 'default'
Mär 01 13:13:03 mod_sql/4.2.2[9246]: user: 'proftpd'
Mär 01 13:13:03 mod_sql/4.2.2[9246]: host: 'localhost'
Mär 01 13:13:03 mod_sql/4.2.2[9246]: db: 'productive'
Mär 01 13:13:03 mod_sql/4.2.2[9246]: port: '5432'
Mär 01 13:13:03 mod_sql/4.2.2[9246]: ttl: '0'
Mär 01 13:13:03 mod_sql/4.2.2[9246]: exiting postgres
cmd_defineconnection
Mär 01 13:13:03 mod_sql/4.2.2[9246]: entering postgres cmd_open
Kernel: 2.6.18-6-xen-amd64
Shared Library: lrwxrwxrwx 1 root root 11 24. Feb 18:02
/lib/libc.so.6 -> libc-2.7.so
My Assumption: Child-Spawn on FTP-Connect failed, therefore session is
immediately closed. The main-process is running after such a connect
failure, so the general protection rip seem to happen in the child.
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