Re: ls \\\\\?\\DRIVE\\ Aborted (core dumped)

[Jürgen Wagner <juergen at wagner dot is>]

The whole interpretation of paths of this sort seems to be inconsistent.

ls \\\\\?\\c:\\
=> lists C:/

ls \\\\\?\\d:\\
=> lists D:/

ls \\\\\?\\blah:\\
assertion "p >= path" failed: file 
"/home/corinna/src/cygwin/cygwin-3.0.7/cygwin-3.0.7-1.x86_64/src/newlib-cygwin/winsup/cygwin/path.cc", 
line 2916, function: int symlink_info::check(char*, const suffix_info*, 
fs_info&, path_conv_handle&)
Aborted (core dumped)

ls \\\\\?\\c\\
=> lists C:/

ls \\\\\?\\d\\
=> lists C:/ (in fact, it lists the contents of the top folder of the 
drive your current working directory is located in)

ls \\\\\?\\a\\
=> lists C:/ (in fact, there is no drive A: on my system)

ls \\\\.\\d:\\
ls: cannot access '\\.\d:\': Not a directory
=> The alternative notation with a "." does not seem to be understood. 
It works in DOS shells.

ls //\?/d:/
ls: cannot access '//?/d:/': Not a directory
=> The replacement notation with forward slashes (which works with UNC 
paths) does not seem to be honored here.

It seems to me the device notation is not really implemented in Cygwin, 
and if invalid device paths are used or strange, invalid syntactic forms 
are used, this fails with a core dump.

This is on CYGWIN_NT-10.0 saraswati 3.0.7(0.338/5/3) 2019-04-30 18:08 
x86_64 Cygwin on a Dell 5470 with the latest Windows 10 version.

Best regards,
--Jürgen


On 24.09.2019 00:26, Andrey Repin wrote:
> Greetings, Brian Inglis!
>
> > On 2019-09-23 09:02, Ken Brown wrote:
> > > On 9/23/2019 10:42 AM, Mark Zhitomirski wrote:
> > > > While trying different path names I've hit the following crash:
> > > >
> > > > $ ls \\\\\?\\DRIVE\\
> > > > assertion "p >= path" failed: file
> > > > "/home/corinna/src/cygwin/cygwin-3.0.7/cygwin-3.0.7-1.x86_64/src/newlib-cygwin/winsup/cygwin/path.cc",
> > > > line 2916, function: int symlink_info::check(char*, const
> > > > suffix_info*, fs_info&, path_conv_handle&)
> > > > Aborted (core dumped)
> $ ls -ld \\\\\?\\C:\\
> drwxr-xr-x 1 anrdaemon None 0 сен 13 23:19 '\\?\C:\'
>
> WJFFM
>
> > > Thanks for the report.  I can confirm the crash.  I'll look into it.
> > Although:
> > $ ll $SYSTEMDRIVE\\
> > lists normally, the owner and group is the current user, whereas the correct
> > owners and groups are shown by:
> > $ ll /proc/cygdrive/c/
> That did not work for me, both show current user:group.
> For reference,
>
> fstab:
> none / cygdrive noacl,binary,nouser,posix=0 0 0
>
> $ mount
> …
> C: on /c type ntfs (binary,noacl,posix=0,noumount,auto)
>
> > and Cygwin really does not like the entries in:
> > $ ll \\\\\?\\*\\
> > use of any name instead of *, or none causes a crash:
> > $ ll \\\\\?\\Boot\\
> > $ ll \\\\\?\\
> I wonder, what have you tried to reach here?

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