Re: cat /proc/partitions shows only devices, not partitions
On Mon, Mar 9, 2020 at 9:47 AM Hashim Aziz wrote: > I see. Do you know how I would go about resolving this, as I am using an > Administrator account and have never run into any other issues reading, > writing or otherwise making changes to those drives. As a side point: It is important to understand that "logging on using an account that's a member of the Administrators group" is not the same as "running elevated" when UAC (User Account Control) is enabled. (It is not recommended to disable UAC.) If you don't launch your Cygwin shell using the "Run as administrator" option, the Administrator group is not enabled in the process token, and thus actually does not have administrator permissions. (Using the "Run as administrator" option is often referred to as "running elevated.") Bill "--Problem reports: http://cygwin.com/problems.htmlFAQ: http://cygwin.com/faq/Documentation: http://cygwin.com/docs.htmlUnsubscribe info: http://cygwin.com/ml/#unsubscribe-simple;
Re: cat /proc/partitions shows only devices, not partitions
I see. Do you know how I would go about resolving this, as I am using an Administrator account and have never run into any other issues reading, writing or otherwise making changes to those drives. Hashim From: cygwin-ow...@cygwin.com on behalf of Corinna Vinschen Sent: Tuesday, March 03, 2020 4:46 PM To: cygwin@cygwin.com Subject: Re: cat /proc/partitions shows only devices, not partitions On Mar 3 16:32, Hashim Aziz wrote: > Yes, this was what I expected you meant by elevated shell. I tried that > earlier and got no luck (though I tried the link to the Cygwin terminal in my > start menu > not a desktop shortcut), and I just tried again after attempting several > permissions fixes but still no luck. > > The permissions fixed I tried were: > > - Right-clicking and deselecting Read-Only on the cygwin64 folder > - Resetting permissions with the CMD command: icacls c:\cygwin64 /reset /t /l > /c > - Taking control of the Cygwin folder with the following command (itself run > from an elevated window): > [...] When I was talking about permissions, I was talking about permissions on the native Windows devices, not any permissions on Cygwin files. The strace output shows that you don't have permissions to call DeviceIoControl(IOCTL_DISK_GET_PARTITION_INFO) or DeviceIoControl(IOCTL_DISK_GET_PARTITION_INFO_EX) on the devices representing the partitions in the native NT device namespace, i.e., \Device\Harddisk0\Partition0, etc. Corinna -- Corinna Vinschen Cygwin Maintainer "--Problem reports: http://cygwin.com/problems.htmlFAQ: http://cygwin.com/faq/Documentation: http://cygwin.com/docs.htmlUnsubscribe info: http://cygwin.com/ml/#unsubscribe-simple;
Re: cat /proc/partitions shows only devices, not partitions
Greetings, Hashim Aziz! Please no top posting on the list. > An update to this, I resorted to nuking and then re-installing Cygwin from > scratch, and the problem STILL persists. This seems to suggest that > something is wrong with Windows itself that is responsible for Cygwin no > longer being able to see the the drive letters that partitions are mounted > at, but what that something could be I have no idea anymore. Look at the list of your installed software and ask yourself, which of them could impose additional restrictions on low-level API's? Various would-be-"antiviruses", "antihacking" and "firewall" applications are ready candidates for investigation. P.S. If you have an hour to spare, you could try installing your OS in a VM and check in there. -- With best regards, Andrey Repin Monday, March 9, 2020 6:08:37 Sorry for my terrible english... "--Problem reports: http://cygwin.com/problems.htmlFAQ: http://cygwin.com/faq/Documentation: http://cygwin.com/docs.htmlUnsubscribe info: http://cygwin.com/ml/#unsubscribe-simple;
Re: cat /proc/partitions shows only devices, not partitions
An update to this, I resorted to nuking and then re-installing Cygwin from scratch, and the problem STILL persists. This seems to suggest that something is wrong with Windows itself that is responsible for Cygwin no longer being able to see the the drive letters that partitions are mounted at, but what that something could be I have no idea anymore. From: Hashim Aziz Sent: 03 March 2020 4:32 PM To: cygwin@cygwin.com Subject: Re: cat /proc/partitions shows only devices, not partitions Yes, this was what I expected you meant by elevated shell. I tried that earlier and got no luck (though I tried the link to the Cygwin terminal in my start menu not a desktop shortcut), and I just tried again after attempting several permissions fixes but still no luck. The permissions fixed I tried were: - Right-clicking and deselecting Read-Only on the cygwin64 folder - Resetting permissions with the CMD command: icacls c:\cygwin64 /reset /t /l /c - Taking control of the Cygwin folder with the following command (itself run from an elevated window): $ chown $USER /* -v ownership of '/bin' retained as Hashim chown: changing ownership of '/cygdrive': Permission denied failed to change ownership of '/cygdrive' from Hashim to Hashim chown: changing ownership of '/Cygwin.bat': Permission denied failed to change ownership of '/Cygwin.bat' from Hashim to Hashim chown: changing ownership of '/Cygwin.ico': Permission denied failed to change ownership of '/Cygwin.ico' from Hashim to Hashim chown: changing ownership of '/Cygwin-Terminal.ico': Permission denied failed to change ownership of '/Cygwin-Terminal.ico' from Hashim to Hashim ownership of '/dev' retained as Hashim ownership of '/etc' retained as Hashim ownership of '/home' retained as Hashim ownership of '/lib' retained as Hashim ownership of '/opt' retained as Hashim chown: changing ownership of '/proc': Operation not permitted failed to change ownership of '/proc' from Hashim to Hashim ownership of '/sbin' retained as Hashim ownership of '/srv' retained as Hashim ownership of '/tmp' retained as Hashim ownership of '/usr' retained as Hashim ownership of '/var' retained as Hashim Whether the above output is normal or not I'm unsure. From: Corinna Vinschen Sent: Tuesday, March 03, 2020 10:44 AM To: Hashim Aziz Cc: cygwin@cygwin.com Subject: Re: cat /proc/partitions shows only devices, not partitions On Mar 3 00:54, Hashim Aziz wrote: > Hey Corinna, thanks for your quick reply. > > Regarding the elevated shell - I'm unsure of exactly how to run an > elevated Cygwin shell? Right click on the Cygwin Terminal icon on the desktop, choose the item "Run as administrator". I have no idea why your system has different permissions, but at least you should be able to see the info in an elevated shell. Corinna -- Corinna Vinschen Cygwin Maintainer "--Problem reports: http://cygwin.com/problems.htmlFAQ: http://cygwin.com/faq/Documentation: http://cygwin.com/docs.htmlUnsubscribe info: http://cygwin.com/ml/#unsubscribe-simple;
Re: cat /proc/partitions shows only devices, not partitions
Greetings, Hashim Aziz!
> This was an issue that I had previously in September of last year and sent
> the issue to this mailing list ("win-mounts no longer displays anything when
> doing "cat /proc/partitions") but the issue stopped occurring before I could
> get around to diagnosing it. This issue has now re-occurred and this time it
> seems permanent. When I run:
> $ cat /proc/partitions
> major minor #blocks name win-mounts
> 8 0 0 sda
> 816 0 sdb
> 832 0 sdc
> 848 0 sdd
> 864 0 sde
> 880 0 sdf
$ cat /proc/partitions
major minor #blocks name win-mounts
8 0 78150744 sda
8 1102400 sda1
8 2131072 sda2
8 3 77916160 sda3 C:\ C:\dev\sda1\
816 488386584 sdb
817 486615520 sdb1
832 488386584 sdc
833 488384512 sdc1
848 312571224 sdd
849 312568641 sdd1
864 0 sde
880 0 sdf
896 0 sdg
8 112 0 sdh
> ...I see nothing at all in the win-mounts column. This makes it impossible
> for me to see which Windows drive letter maps to which /dev/sdX entry.
This seems like a permissions issue.
> win-mounts column. I'm running Cygwin on Windows 7 (yes I'm aware it's EOL).
Same here. Win 7 Pro SP1.
--
With best regards,
Andrey Repin
Wednesday, March 4, 2020 22:00:31
Sorry for my terrible english...
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Re: cat /proc/partitions shows only devices, not partitions
On Mar 3 16:32, Hashim Aziz wrote: > Yes, this was what I expected you meant by elevated shell. I tried that > earlier and got no luck (though I tried the link to the Cygwin terminal in my > start menu > not a desktop shortcut), and I just tried again after attempting several > permissions fixes but still no luck. > > The permissions fixed I tried were: > > - Right-clicking and deselecting Read-Only on the cygwin64 folder > - Resetting permissions with the CMD command: icacls c:\cygwin64 /reset /t /l > /c > - Taking control of the Cygwin folder with the following command (itself run > from an elevated window): > [...] When I was talking about permissions, I was talking about permissions on the native Windows devices, not any permissions on Cygwin files. The strace output shows that you don't have permissions to call DeviceIoControl(IOCTL_DISK_GET_PARTITION_INFO) or DeviceIoControl(IOCTL_DISK_GET_PARTITION_INFO_EX) on the devices representing the partitions in the native NT device namespace, i.e., \Device\Harddisk0\Partition0, etc. Corinna -- Corinna Vinschen Cygwin Maintainer signature.asc Description: PGP signature
Re: cat /proc/partitions shows only devices, not partitions
Yes, this was what I expected you meant by elevated shell. I tried that earlier and got no luck (though I tried the link to the Cygwin terminal in my start menu not a desktop shortcut), and I just tried again after attempting several permissions fixes but still no luck. The permissions fixed I tried were: - Right-clicking and deselecting Read-Only on the cygwin64 folder - Resetting permissions with the CMD command: icacls c:\cygwin64 /reset /t /l /c - Taking control of the Cygwin folder with the following command (itself run from an elevated window): $ chown $USER /* -v ownership of '/bin' retained as Hashim chown: changing ownership of '/cygdrive': Permission denied failed to change ownership of '/cygdrive' from Hashim to Hashim chown: changing ownership of '/Cygwin.bat': Permission denied failed to change ownership of '/Cygwin.bat' from Hashim to Hashim chown: changing ownership of '/Cygwin.ico': Permission denied failed to change ownership of '/Cygwin.ico' from Hashim to Hashim chown: changing ownership of '/Cygwin-Terminal.ico': Permission denied failed to change ownership of '/Cygwin-Terminal.ico' from Hashim to Hashim ownership of '/dev' retained as Hashim ownership of '/etc' retained as Hashim ownership of '/home' retained as Hashim ownership of '/lib' retained as Hashim ownership of '/opt' retained as Hashim chown: changing ownership of '/proc': Operation not permitted failed to change ownership of '/proc' from Hashim to Hashim ownership of '/sbin' retained as Hashim ownership of '/srv' retained as Hashim ownership of '/tmp' retained as Hashim ownership of '/usr' retained as Hashim ownership of '/var' retained as Hashim Whether the above output is normal or not I'm unsure. From: Corinna Vinschen Sent: Tuesday, March 03, 2020 10:44 AM To: Hashim Aziz Cc: cygwin@cygwin.com Subject: Re: cat /proc/partitions shows only devices, not partitions On Mar 3 00:54, Hashim Aziz wrote: > Hey Corinna, thanks for your quick reply. > > Regarding the elevated shell - I'm unsure of exactly how to run an > elevated Cygwin shell? Right click on the Cygwin Terminal icon on the desktop, choose the item "Run as administrator". I have no idea why your system has different permissions, but at least you should be able to see the info in an elevated shell. Corinna -- Corinna Vinschen Cygwin Maintainer -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
Re: cat /proc/partitions shows only devices, not partitions
On Mar 3 00:54, Hashim Aziz wrote:
> Hey Corinna, thanks for your quick reply.
>
> Regarding the elevated shell - I'm unsure of exactly how to run an
> elevated Cygwin shell?
Right click on the Cygwin Terminal icon on the desktop, choose the
item "Run as administrator".
> I have attached the requested strace file.
Here's what I see for all partitions in the trace output:
460 21259 [main] cat 553 format_proc_partitions: DeviceIoControl
(Harddisk0\Partition0, IOCTL_DISK_GET_PARTITION_INFO{_EX}) Win32 error 5
Win32 error 5 is ERROR_ACCESS_DENIED.
So it appears that the OS access is denied for some reason. I tried
again on Windows 7, this time with a non-admin account, just to be sure,
but I still can see the partition info. Yesterday I tried with an admin
account, just not in an elevated shell, so this may have been an
important difference. Apparently not so.
I have no idea why your system has different permissions, but at least
you should be able to see the info in an elevated shell.
Corinna
--
Corinna Vinschen
Cygwin Maintainer
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Description: PGP signature
Re: cat /proc/partitions shows only devices, not partitions
Hey Corinna, thanks for your quick reply.
Regarding the elevated shell - I'm unsure of exactly how to run an elevated
Cygwin shell?
I have attached the requested strace file.
Thanks,
Hashim
From: Corinna Vinschen
Sent: Monday, March 02, 2020 4:56 PM
To: Hashim Aziz
Cc: cygwin
Subject: Re: cat /proc/partitions shows only devices, not partitions
On Mar 1 21:16, Hashim Aziz wrote:
> This was an issue that I had previously in September of last year and
> sent the issue to this mailing list ("win-mounts no longer displays
> anything when doing "cat /proc/partitions") but the issue stopped
> occurring before I could get around to diagnosing it. This issue has
> now re-occurred and this time it seems permanent. When I run:
>
> $ cat /proc/partitions
> major minor #blocks name win-mounts
>
> 8 0 0 sda
> 8 16 0 sdb
> 8 32 0 sdc
> 8 48 0 sdd
> 8 64 0 sde
> 8 80 0 sdf
>
> ...I see nothing at all in the win-mounts column. This makes it
> impossible for me to see which Windows drive letter maps to which
> /dev/sdX entry. On closer inspection, this seems to be because I'm not
> actually seeing any partitions of my drives, even though there are
> many - for example, I see /dev/sda but no /dev/sda1 or /dev/sda2, and
> because it's the partitions that are mounted, it's this that seems to
> result in me seeing nothing in the win-mounts column. I'm running
> Cygwin on Windows 7 (yes I'm aware it's EOL).
Fortunately I just started Windows 7 for another thread here, so I
gave it a try myself:
$ uname -a
CYGWIN_NT-6.1 vmbert764 3.1.4(0.340/5/3) 2020-02-19 08:49 x86_64 Cygwin
$ id -G | grep -Eq '\<544\>' && echo elevated || echo non-elevated
non-elevated
$ cat /proc/partitions
major minor #blocks name win-mounts
8 0 54525952 sda
8 1 102400 sda1
8 2 54420480 sda2 C:\
So, https://cygwin.com/acronyms/#WJFFM
This appears to be a local phenomenon only, either some permission
problem, or some BLODA, a life virus scanner or something.
Two questions come to mind:
- Does it work in an elevated shell?
- If you run this under strace, does it show anything unusual?
We could take a look if you call
strace -o cat.trace cat /proc/partitions
and send the cat.trace file here (assuming it still doesn't work).
Corinna
--
Corinna Vinschen
Cygwin Maintainer
cat.trace
Description: cat.trace
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Re: cat /proc/partitions shows only devices, not partitions
Hey Corinna, thanks for your quick reply.
Regarding the elevated shell - I'm unsure of exactly how to run an elevated
Cygwin shell?
I have attached the requested strace file.
Thanks,
Hashim
From: Corinna Vinschen
Sent: Monday, March 02, 2020 4:56 PM
To: Hashim Aziz
Cc: cygwin
Subject: Re: cat /proc/partitions shows only devices, not partitions
On Mar 1 21:16, Hashim Aziz wrote:
> This was an issue that I had previously in September of last year and
> sent the issue to this mailing list ("win-mounts no longer displays
> anything when doing "cat /proc/partitions") but the issue stopped
> occurring before I could get around to diagnosing it. This issue has
> now re-occurred and this time it seems permanent. When I run:
>
> $ cat /proc/partitions
> major minor #blocks name win-mounts
>
> 8 0 0 sda
> 8 16 0 sdb
> 8 32 0 sdc
> 8 48 0 sdd
> 8 64 0 sde
> 8 80 0 sdf
>
> ...I see nothing at all in the win-mounts column. This makes it
> impossible for me to see which Windows drive letter maps to which
> /dev/sdX entry. On closer inspection, this seems to be because I'm not
> actually seeing any partitions of my drives, even though there are
> many - for example, I see /dev/sda but no /dev/sda1 or /dev/sda2, and
> because it's the partitions that are mounted, it's this that seems to
> result in me seeing nothing in the win-mounts column. I'm running
> Cygwin on Windows 7 (yes I'm aware it's EOL).
Fortunately I just started Windows 7 for another thread here, so I
gave it a try myself:
$ uname -a
CYGWIN_NT-6.1 vmbert764 3.1.4(0.340/5/3) 2020-02-19 08:49 x86_64 Cygwin
$ id -G | grep -Eq '\<544\>' && echo elevated || echo non-elevated
non-elevated
$ cat /proc/partitions
major minor #blocks name win-mounts
8 0 54525952 sda
8 1 102400 sda1
8 2 54420480 sda2 C:\
So, https://cygwin.com/acronyms/#WJFFM
This appears to be a local phenomenon only, either some permission
problem, or some BLODA, a life virus scanner or something.
Two questions come to mind:
- Does it work in an elevated shell?
- If you run this under strace, does it show anything unusual?
We could take a look if you call
strace -o cat.trace cat /proc/partitions
and send the cat.trace file here (assuming it still doesn't work).
Corinna
--
Corinna Vinschen
Cygwin Maintainer
cat.trace
Description: cat.trace
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Re: cat /proc/partitions shows only devices, not partitions
On Mar 1 21:16, Hashim Aziz wrote:
> This was an issue that I had previously in September of last year and
> sent the issue to this mailing list ("win-mounts no longer displays
> anything when doing "cat /proc/partitions") but the issue stopped
> occurring before I could get around to diagnosing it. This issue has
> now re-occurred and this time it seems permanent. When I run:
>
> $ cat /proc/partitions
> major minor #blocks name win-mounts
>
> 8 0 0 sda
> 816 0 sdb
> 832 0 sdc
> 848 0 sdd
> 864 0 sde
> 880 0 sdf
>
> ...I see nothing at all in the win-mounts column. This makes it
> impossible for me to see which Windows drive letter maps to which
> /dev/sdX entry. On closer inspection, this seems to be because I'm not
> actually seeing any partitions of my drives, even though there are
> many - for example, I see /dev/sda but no /dev/sda1 or /dev/sda2, and
> because it's the partitions that are mounted, it's this that seems to
> result in me seeing nothing in the win-mounts column. I'm running
> Cygwin on Windows 7 (yes I'm aware it's EOL).
Fortunately I just started Windows 7 for another thread here, so I
gave it a try myself:
$ uname -a
CYGWIN_NT-6.1 vmbert764 3.1.4(0.340/5/3) 2020-02-19 08:49 x86_64 Cygwin
$ id -G | grep -Eq '\<544\>' && echo elevated || echo non-elevated
non-elevated
$ cat /proc/partitions
major minor #blocks name win-mounts
8 0 54525952 sda
8 1102400 sda1
8 2 54420480 sda2 C:\
So, https://cygwin.com/acronyms/#WJFFM
This appears to be a local phenomenon only, either some permission
problem, or some BLODA, a life virus scanner or something.
Two questions come to mind:
- Does it work in an elevated shell?
- If you run this under strace, does it show anything unusual?
We could take a look if you call
strace -o cat.trace cat /proc/partitions
and send the cat.trace file here (assuming it still doesn't work).
Corinna
--
Corinna Vinschen
Cygwin Maintainer
signature.asc
Description: PGP signature
cat /proc/partitions shows only devices, not partitions
This was an issue that I had previously in September of last year and sent the
issue to this mailing list ("win-mounts no longer displays anything when doing
"cat /proc/partitions") but the issue stopped occurring before I could get
around to diagnosing it. This issue has now re-occurred and this time it seems
permanent. When I run:
$ cat /proc/partitions
major minor #blocks name win-mounts
8 0 0 sda
816 0 sdb
832 0 sdc
848 0 sdd
864 0 sde
880 0 sdf
...I see nothing at all in the win-mounts column. This makes it impossible for
me to see which Windows drive letter maps to which /dev/sdX entry. On closer
inspection, this seems to be because I'm not actually seeing any partitions of
my drives, even though there are many - for example, I see /dev/sda but no
/dev/sda1 or /dev/sda2, and because it's the partitions that are mounted, it's
this that seems to result in me seeing nothing in the win-mounts column. I'm
running Cygwin on Windows 7 (yes I'm aware it's EOL).
For testing purposes I also ran the following command (for obvious reasons I
don't want to have run something like this to find my drive mappings):
$ for disk in /dev/sd*; do echo -n $disk$'\t'; cygpath -m $disk; done
/dev/sda//./PhysicalDrive0
/dev/sda1 //./D:
/dev/sdb//./PhysicalDrive1
/dev/sdc//./PhysicalDrive2
/dev/sdc1 //./Volume{88cc26b4-e0e5-11e9-9cc4-806e6f6e6963}
/dev/sdc2 //./C:
/dev/sdd//./PhysicalDrive3
/dev/sdd1 //./B:
/dev/sde//./PhysicalDrive4
/dev/sde1 //./HarddiskVolume5
/dev/sde2 //./E:
/dev/sdf//./PhysicalDrive5
/dev/sdf1 //./I:
Thanks in advance for any help with this, it would be very much appreciated as
I rely on Cygwin a lot.
