09-13-2013
It's very strange for a permissions issue to cause a core dump. Not impossible, but a program would need to be pretty badly designed if it crashed rather than just spewing 'permission denied opening such file' and quitting.
I'd suggest loading these core dumps in a debugger and seeing the backtrace.
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LEARN ABOUT OPENDARWIN
issetugid
ISSETUGID(2) BSD System Calls Manual ISSETUGID(2)
NAME
issetugid -- is current executable running setuid or setgid
SYNOPSIS
#include <unistd.h>
int
issetugid(void);
DESCRIPTION
The issetugid() function returns 1 if the process was made setuid or setgid as the result of the last execve() system call. Otherwise it
returns 0.
This system call exists so that library routines (inside libc, libtermlib, or other libraries) can gaurantee safe behavior when used inside
setuid or setgid programs. Some library routines may not be passed sufficient information to know if the current program was started setuid
or setgid because higher level calling code may have made changes to the uid or the euid. In particular, it is wise to use this call to
determine if a pathname returned from a getenv() call may safely be used to open() the specified file.
issetugid() is unaffected by calls to setuid(), fork(), and other such calls. It is only controlled by execve().
ERRORS
The issetugid() function is always successful, and no return value is reserved to indicate an error.
SEE ALSO
execve(2), setuid(2), seteuid(2,) setgid(2), setegid(2)
HISTORY
A lstat() function call appeared in OpenBSD 2.0
OpenBSD 2.0 August, 25 1996 OpenBSD 2.0