The open UNIX operating systems FreeBSD and Linux Mandrake both have integrated shell security systems. The FreeBSD program is located in /etc/security. The Mandrake Security Package for Linux can be found in /usr/share/msec. These standard tools are similar in functionality, but they limit the file system integrity control to files with SUID and SGID flags. But Mandrake calculates MD5 file checksums differently from FreeBSD.more...
Traditionally, Unix/Linux/POSIX filenames can be almost any sequence of bytes, and their meaning is unassigned. The only real rules are that "/" is always the directory separator, and that filenames can't contain byte 0 (because this is the terminator). Although this is flexible, this creates many unnecessary problems. In particular, this lack of limitations makes it unnecessarily difficult to write correct programs (enabling many security flaws), makes it impossible to consistently and accurately display filenames, causes portability problems, and confuses users. more ....
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