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particu
2004 Aug 25
2
[patch] sshd with re-exec disabled causes stdin to get closed.
I ran into a bug while testing 3.9p1.
If you start sshd with -r (re-exec disabled), once the daemon is
forked to handle a client, the child closes stdin by accident.
This causes FD 0 to get re-used by the next open call which eventually
you end up with a mess. In the perticual case I saw, the pty fd
ended up on FD 0 was closed by do_exec_pty(),
pty_make_controlling_tty() then opened a new ttyfd as 0, and
do_exec_pty() duped it dup2(0,0), dup2(0,1), dup2(0,2), then called
close(ttyfd); which closed 0!
Patch against openssh-3.9p1 is attached.
--
Dave