RTEMS don't check write permissions in parent directory for file or directory delete

[sa]

I am using IMFS as a base file system. And I do following operations:

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RTEMS SHELL (Ver.1.0-FRC):/dev/console. Nov 9 2003. 'help' to list commands.

shel etc $ whoami
ant
shel / $ ls
drwxr-xr-x 1 root root 5092 Jan 01 00:00 dev/
drwxrwxrwx 1 root root 3484 Nov 02 22:28 disc/
drwxr-xr-x 1 root root 1340 Nov 02 22:28 etc/
3 files 9916 bytes occupied
shel / $ cd etc
shel etc $ ls
-rw-r--r-- 1 root root 90 Nov 02 22:28 passwd
-rw-r--r-- 1 root root 117 Nov 02 22:28 shadow
-rw-r--r-- 1 root root 42 Nov 02 22:28 group
-rw-r--r-- 1 root root 34 Nov 02 22:28 issue
-rw-r--r-- 1 root root 28 Nov 02 22:28 issue.net
5 files 311 bytes occupied
shel etc $ rm issue
shel etc $ ls
-rw-r--r-- 1 root root 90 Nov 02 22:28 passwd
-rw-r--r-- 1 root root 117 Nov 02 22:28 shadow
-rw-r--r-- 1 root root 42 Nov 02 22:29 group
-rw-r--r-- 1 root root 28 Nov 02 22:28 issue.net
4 files 277 bytes occupied
shel etc $

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I'm not root. I don't have permissions for write in /etc directory, but
I can delete files from /etc.
I see in file "cpukit/libcsupport/src/unlink.c". There are no support
for check write permissions in parent directory.

Release:
RTEMS-4.6

[Jennifer Averett]

State-Changed-From-To: open->closed
State-Changed-Why: Applied attached patch to trunk and branch.

[sa]

unlinkpatch.txt