https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=fcfcc288c4d3e9ad3bca4d0c9dd79ee1c88a99f9
commit fcfcc288c4d3e9ad3bca4d0c9dd79ee1c88a99f9 Author: Corinna Vinschen <cori...@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 <cori...@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