[newlib-cygwin] Cygwin: don't return valid acl entry type for unknown SID

[Corinna Vinschen]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=fcfcc288c4d3e9ad3bca4d0c9dd79ee1c88a99f9

commit fcfcc288c4d3e9ad3bca4d0c9dd79ee1c88a99f9
Author: Corinna Vinschen <***@vinschen.de>
Date: Mon Aug 27 13:30:55 2018 +0200

Cygwin: don't return valid acl entry type for unknown SID

cygpsid::get_id neglects to set the type to 0 (ACL_UNDEFINED_TAG
in POSIX speak) if the SID can not be translated into a valid
uid or gid. This in turn leads to incorrect handling of uid/gid -1
entries.

Fix this by setting type to 0 if the id is unknown.

Signed-off-by: Corinna Vinschen <***@vinschen.de>

Diff:
---
winsup/cygwin/sec_helper.cc | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/winsup/cygwin/sec_helper.cc b/winsup/cygwin/sec_helper.cc
index a1d8cba..373b1df 100644
--- a/winsup/cygwin/sec_helper.cc
+++ b/winsup/cygwin/sec_helper.cc
@@ -169,10 +169,16 @@ cygpsid::get_id (BOOL search_grp, int *type, cyg_ldap *pldap)
}
else if ((pw = internal_getpwsid (*this, pldap)))
id = pw->pw_uid;
- if (id != ILLEGAL_UID && type)
- *type = USER;
+ if (id != ILLEGAL_UID)
+ {
+ if (type)
+ *type = USER;
+ return id;
+ }
}
- return id;
+ if (type)
+ *type = 0; /* undefined type */
+ return ILLEGAL_UID;
}

PWCHAR