Re: [PATCH -mm 5/7] add user namespace

[Eric W. Biederman]

Dave Hansen <haveblue@xxxxxxxxxx> writes:

> On Fri, 2006-07-14 at 11:18 -0600, Eric W. Biederman wrote:
>> /proc/<pid>/fd/...
>> /proc/<pid>/exe
>> /proc/<pid>/cwd
>> 
>> It isn't quite the same as you are actually opening a second
>> copy of the file descriptor but the essence is the same. 
>
> Last I checked, those were symlinks and didn't work for things like
> deleted files.  Am I wrong?

Yes.  They are not really symlinks.

Wanting to have an executable that was deleted after it was done
executing.  I wrote it to a file. opened it, unlinked it, set close
on exec, and the exec'd it with /proc/self/fd/N.

Eric
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