bin/47805: /bin/sh descriptor leak

[yamt%NetBSD.org@localhost]

>Number:         47805
>Category:       bin
>Synopsis:       /bin/sh descriptor leak
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed May 08 04:55:00 +0000 2013
>Originator:     YAMAMOTO Takashi
>Release:        NetBSD current
>Organization:
        
>Environment:
        
        
>Description:
        /bin/sh sometimes leak descriptors on redirection.
        it causes silly renames on nfs and "git rebase -i" fail with ENOTEMPTY.
        
>How-To-Repeat:

$ fstat -p$$
USER     CMD          PID   FD MOUNT       INUM MODE         SZ|DV R/W
takashi  sh          5922   wd /home    2399488 drwxr-xr-x    8192 r 
takashi  sh          5922    0 /dev/pts      15 crw--w----   pts/6 rw
takashi  sh          5922    1 /dev/pts      15 crw--w----   pts/6 rw
takashi  sh          5922    2 /dev/pts      15 crw--w----   pts/6 rw
takashi  sh          5922 1023 /         691216 crw-rw-rw-     tty rw
$ echo 3>/dev/null

$ fstat -p$$
USER     CMD          PID   FD MOUNT       INUM MODE         SZ|DV R/W
takashi  sh          5922   wd /home    2399488 drwxr-xr-x    8192 r 
takashi  sh          5922    0 /dev/pts      15 crw--w----   pts/6 rw
takashi  sh          5922    1 /dev/pts      15 crw--w----   pts/6 rw
takashi  sh          5922    2 /dev/pts      15 crw--w----   pts/6 rw
takashi  sh          5922    3 /         691212 crw-rw-rw-    null w 
takashi  sh          5922   10 /         691212 crw-rw-rw-    null w 
takashi  sh          5922 1023 /         691216 crw-rw-rw-     tty rw
$ 

>Fix:
        FreeBSD SVN rev 199953 seems like a fix for this problem.
http://lists.freebsd.org/pipermail/svn-src-head/2009-November/012085.html

>Unformatted: