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Cygwin: AF_UNIX: use FILE_OPEN_REPARSE_POINT when needed 

The following Windows system calls currently fail with
STATUS_IO_REPARSE_TAG_NOT_HANDLED when called on an AF_UNIX socket:

- NtOpenFile in get_file_sd

- NtOpenFile in set_file_sd

- NtCreateFile in fhandler_base::open

Fix this by adding the FILE_OPEN_REPARSE_POINT flag to those calls
when the file is a known reparse point.
This commit is contained in:
Ken Brown 2020-09-28 15:57:56 -04:00
parent ea275093c1
commit 4b4fffe0f2
2 changed files with 15 additions and 4 deletions
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11
winsup/cygwin/fhandler.cc
View File

@ -620,13 +620,20 @@ fhandler_base::open (int flags, mode_t mode)
else
create_disposition = (flags & O_CREAT) ? FILE_OPEN_IF : FILE_OPEN;
if (get_device () == FH_FS)
if (get_device () == FH_FS
#ifdef __WITH_AF_UNIX
|| get_device () == FH_UNIX
#endif
)
{
/* Add the reparse point flag to known repares points, otherwise we
/* Add the reparse point flag to known reparse points, otherwise we
open the target, not the reparse point. This would break lstat. */
if (pc.is_known_reparse_point ())
options |= FILE_OPEN_REPARSE_POINT;
}
if (get_device () == FH_FS)
{
/* O_TMPFILE files are created with delete-on-close semantics, as well
as with FILE_ATTRIBUTE_TEMPORARY. The latter speeds up file access,
because the OS tries to keep the file in memory as much as possible.

8
winsup/cygwin/security.cc
View File

@ -65,7 +65,9 @@ get_file_sd (HANDLE fh, path_conv &pc, security_descriptor &sd,
fh ? pc.init_reopen_attr (attr, fh)
: pc.get_object_attr (attr, sec_none_nih),
&io, FILE_SHARE_VALID_FLAGS,
FILE_OPEN_FOR_BACKUP_INTENT);
FILE_OPEN_FOR_BACKUP_INTENT
| pc.is_known_reparse_point ()
? FILE_OPEN_REPARSE_POINT : 0);
if (!NT_SUCCESS (status))
{
sd.free ();
@ -232,7 +234,9 @@ set_file_sd (HANDLE fh, path_conv &pc, security_descriptor &sd, bool is_chown)
: pc.get_object_attr (attr, sec_none_nih),
&io,
FILE_SHARE_VALID_FLAGS,
FILE_OPEN_FOR_BACKUP_INTENT);
FILE_OPEN_FOR_BACKUP_INTENT
| pc.is_known_reparse_point ()
? FILE_OPEN_REPARSE_POINT : 0);
if (!NT_SUCCESS (status))
{
fh = NULL;