This goes through a buffer in advapi32, so it's not obviously visible to the application; however, it means that a call to getrandom() will return EFAULT and won't actually fill the buffer.
This was implemented upstream in e.g. 52e09e823e2a2b65f1f993145c0a65ab1d84713d and 926dd780697852b375ec0a193c762e7723a3f5e6, albeit in ntdll instead of mscoree.
This patch concerns the case where we successfully create a read-only directory
with FILE_DELETE_ON_CLOSE. Currently we return STATUS_CANNOT_DELETE (having
cleared O_CREAT). This patch would change that to return success.
However, tests show that this is incorrect. Actually FILE_DELETE_ON_CLOSE should
always fail on a read-only file, including when that file is created by the same
call.
These were committed without any explanation, but they do seem to fix Cygwin
unlink(), and it's been observed that many patches in Wine-Staging, whether
labeled or not, were specifically for Cygwin.
The relevant functionality was fixed a different way upstream, namely:
91e442b060
