https://bugzilla.mindrot.org/show_bug.cgi?id=3310
Bug ID: 3310
Summary: Correctly restoring channel's FDs nonblocking mode
Product: Portable OpenSSH
Version: 8.6p1
Hardware: Other
OS: Linux
Status: NEW
Severity: normal
Priority: P5
Component: ssh
Assignee: [email protected]
Reporter: [email protected]
OpenSSH incorrectly restores the standard mode (blocking mode) on
standard output upon exiting. This causes the next shell scripts
commands to potentially fail in EAGAIN.
The reproducer is:
#!/bin/sh
(
ssh localhost true
cat /dev/zero
) | sleep 30
Restoring the blocking modes happens with the duped file descriptors
and too late.
The changes causing this problem was introduced in 4d5456c
The PR intended to fix the issue is
https://github.com/openssh/openssh-portable/pull/246
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