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fcntl.ioctl raises SystemError: buffer overflow instead of ValueError when mutating undersized buffers #144206

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extension-modulesC modules in the Modules dirpendingThe issue will be closed if no feedback is providedtype-bugAn unexpected behavior, bug, or error
@YuanchengJiang

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@YuanchengJiang

Bug report

Bug description:

importfcntlimporttermioswithopen('/dev/tty','rb')asfd:fcntl.ioctl(fd,termios.TIOCGPGRP,b'',True)
fcntl.ioctl(fd, termios.TIOCGPGRP, b'', True)    ~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^SystemError: buffer overflow

CPython versions tested on:

CPython main branch

Operating systems tested on:

Linux

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    extension-modulesC modules in the Modules dirpendingThe issue will be closed if no feedback is providedtype-bugAn unexpected behavior, bug, or error

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