[Bug 48891] Bash from Cygwin/msys2 terminates after first command

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=48891

--- Comment #17 from Damjan Jovanovic <damjan.jov at gmail.com> ---
Created attachment 67113
  --> https://bugs.winehq.org/attachment.cgi?id=67113
Hack to disable create_symlink() access checks in wineserver

It's definitely (1) from my prior analysis, NtCreateSymbolicLink() previously
failed, then causing NtOpenSymbolicLink() to fail on that link, causing 0 to
get returned to the parent process due to a lack of error checking in Cygwin
(which should return -1 and set errno).

The reason NtCreateSymbolicLink() fails is that wineserver returns
STATUS_ACCESS_DENIED, and the reason that it does that is that the access
rights checks between symlink_map_access() and check_object_access() go wrong
somewhere. I haven't figured that out yet.

However the attached hack works around that for now, by disabling access checks
for symbolic links. It successfully gets fork() to return the right PID to the
parent instead of 0, and gets the shell (bash, dash) to remain open after
running its first command and able to run many more commands :-).

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