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Re: gnu tar 1.19 requires open() with O_DIRECTORY?
From: |
Eric Blake |
Subject: |
Re: gnu tar 1.19 requires open() with O_DIRECTORY? |
Date: |
Mon, 18 Feb 2008 21:30:46 -0700 |
User-agent: |
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.9) Gecko/20071031 Thunderbird/2.0.0.9 Mnenhy/0.7.5.666 |
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According to John E. Malmberg on 2/18/2008 8:46 PM:
| I have run into a problem: GNU TAR now requires that the open() call
| support O_DIRECTORY.
Tar is using O_DIRECTORY to close a security hole, and not to directly
read the directory contents. And POSIX requires that a directory be
openable read-only, even though reads on such a fd are allowed to fail.
Gnulib's replacemente <fcntl.h> should detect platforms that lack
O_DIRECTORY, and define it to 0 on those platforms. The trick now is
figuring out why gnulib's <fcntl.h> didn't work for VMS; it may also be
necessary to provide a replacement open() that can 'support' opening
directories by using opendir under the hood.
- --
Don't work too hard, make some time for fun as well!
Eric Blake address@hidden
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Re: gnu tar 1.19 requires open() with O_DIRECTORY?, James Youngman, 2008/02/21