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Differential D40100

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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Linux Emulation
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rGaddf706f6ff0: linux(4): Check fd passed to unlockpt()
rG0f62290e7f74: linux(4): Check fd passed to unlockpt()
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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sys/
compat/
linux/
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sys/compat/linux/linux_ioctl.c

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