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linux(4): Check fd passed to unlockpt()
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Authored by dchagin on May 14 2023, 11:18 PM.
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Summary

In our implementation, grantpt() and unlockpt() don't actually have
any use, because PTY's are created on the fly and already have proper
permissions upon creation.
Atleast check that a proper fd passed to unlockpt(). For grantpt()
Glibc calls TIOCGPTN ioctl which would fail if fd is not a master.

MFC after: 1 week

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rG FreeBSD src repository
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