search for: req_pwnam

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2008 Jul 12
2
[Bug 1487] New: Race condition between monitor and unprivileged child in sshd
...t executes monitor_child_preauth() to allow certain privsep requests necessary for authentication. The unprivileged child runs do_ssh2_kex() followed by do_authentication2(). If KEX is fast enough, do_authentication2() runs before the monitor has a chance to permit the necessary requests (MONITOR_REQ_PWNAM in articular), and therefore authentication fails on the server with: monitor_read: unpermitted request 6 Damien Miller proposed setting up a pipe shared between the monitor and child, and making the child wait until the monitor end closes, which it should do after permitting the monitor calls....