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Subject: Re: Smartctl issues in Cygwin with elevated terminal
To: The Cygwin Mailing List <cygwin AT cygwin DOT com>
References: <228fb395-f742-5d99-d108-f3394129d97e AT hamishmb DOT com>
From: Christian Franke <Christian DOT Franke AT t-online DOT de>
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Date: Tue, 13 Sep 2022 19:23:48 +0200
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Hamish McIntyre-Bhatty wrote:
> I recently noticed that smartctl only works when the Cygwin Terminal 
> isn't run as administrator - the opposite way round to Linux where you 
> need superuser privileges to access the disk.
>
> With Administrator privileges on Windows 11, I get:
>
> "Read Device Identity Failure Input/Output error"

This likely happens because one of the tried pass-through I/O-controls 
returns an error code which does not mean "not implemented". This is a 
limitation or bug in the driver of the disk controller.

For further diagnostics, try for example. 'smartctl -r ioctl,2 -i /dev/sda'


>
> But it continues to work fine as a normal user.

When run without admin rights for a SATA device, smarctl may print:
"Warning: Limited functionality due to missing admin rights"
and then prints only limited device identify and SMART DATA information 
returned by IOCTL_STORAGE_QUERY_PROPERTY and IOCTL_STORAGE_PREDICT_FAILURE.

Other functionality requires admin rights and a working pass-through 
I/O-control - try 'smartctl -x /dev/sda'.


Please note that the above is not Cygwin specific as it applies to both 
(Cygwin and Mingw-w64) Windows builds of smartctl. Use this ML for 
related support requests:
https://listi.jpberlin.de/mailman/listinfo/smartmontools-support


>
> Does anyone know why? In my case, this actually matters because I'm 
> not sure how to elevate and/or drop privileges in Cygwin, as sudo 
> doesn't work due to it not being Unixy underneath.

To drop privileges, try 'cygdrop' tool from 'cygutils-extra' package.


-- 
Regards,
Christian


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