From: Dave Hansen <haveblue@us.ibm.com>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: "Serge E. Hallyn" <serue@us.ibm.com>,
Cedric Le Goater <clg@fr.ibm.com>,
linux-kernel@vger.kernel.org, Andrew Morton <akpm@osdl.org>,
Kirill Korotaev <dev@openvz.org>, Andrey Savochkin <saw@sw.ru>,
Herbert Poetzl <herbert@13thfloor.at>,
Sam Vilain <sam.vilain@catalyst.net.nz>
Subject: Re: [PATCH -mm 5/7] add user namespace
Date: Fri, 14 Jul 2006 11:42:02 -0700 [thread overview]
Message-ID: <1152902522.314.47.camel@localhost.localdomain> (raw)
In-Reply-To: <m1u05krrhz.fsf@ebiederm.dsl.xmission.com>
On Fri, 2006-07-14 at 12:06 -0600, Eric W. Biederman wrote:
> > 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.
Well, on one hand, it makes checkpoints with deleted files easier ;)
Now that I'm actually looking at the code, isn't
proc_fd_access_allowed()'s permission just derived from ptrace
permissions? It doesn't seem to involve uids directly at all!
-- Dave
next prev parent reply other threads:[~2006-07-14 18:42 UTC|newest]
Thread overview: 107+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-07-11 7:50 [PATCH -mm 0/7] execns syscall and user namespace Cedric Le Goater
2006-07-11 7:50 ` [PATCH -mm 1/7] add execns syscall core routine Cedric Le Goater
2006-07-11 7:50 ` [PATCH -mm 2/7] add execns syscall to s390 Cedric Le Goater
2006-07-11 13:44 ` Martin Schwidefsky
2006-07-11 13:44 ` Martin Schwidefsky
2006-07-11 14:44 ` Cedric Le Goater
2006-07-11 14:54 ` Martin Schwidefsky
2006-07-11 15:43 ` Cedric Le Goater
2006-07-11 7:50 ` [PATCH -mm 3/7] add execns syscall to x86_64 Cedric Le Goater
2006-07-11 7:50 ` [PATCH -mm 4/7] add execns syscall to i386 Cedric Le Goater
2006-07-11 7:50 ` [PATCH -mm 5/7] add user namespace Cedric Le Goater
2006-07-11 16:39 ` Kirill Korotaev
2006-07-11 17:38 ` Cedric Le Goater
2006-07-12 11:21 ` Kirill Korotaev
2006-07-13 16:01 ` Cedric Le Goater
2006-07-12 3:33 ` Eric W. Biederman
2006-07-12 11:13 ` Kirill Korotaev
2006-07-12 18:10 ` Eric W. Biederman
2006-07-13 17:00 ` Cedric Le Goater
2006-07-13 18:07 ` Eric W. Biederman
2006-07-13 18:21 ` Eric W. Biederman
2006-07-13 18:31 ` Dave Hansen
2006-07-13 18:54 ` Eric W. Biederman
2006-07-12 3:46 ` Eric W. Biederman
2006-07-12 12:05 ` Herbert Poetzl
2006-07-12 17:09 ` Eric W. Biederman
2006-07-12 14:00 ` Cedric Le Goater
2006-07-12 17:24 ` Eric W. Biederman
2006-07-13 17:36 ` Cedric Le Goater
2006-07-13 17:47 ` Serge E. Hallyn
2006-07-13 18:14 ` Eric W. Biederman
2006-07-13 18:29 ` Dave Hansen
2006-07-13 19:02 ` Eric W. Biederman
2006-07-13 20:03 ` Dave Hansen
2006-07-14 3:45 ` Eric W. Biederman
2006-07-14 14:28 ` Dave Hansen
2006-07-14 15:13 ` Eric W. Biederman
2006-07-14 16:29 ` Serge E. Hallyn
2006-07-14 16:49 ` Eric W. Biederman
2006-07-14 16:55 ` Dave Hansen
2006-07-14 17:08 ` Serge E. Hallyn
2006-07-14 17:19 ` Dave Hansen
2006-07-14 17:36 ` Eric W. Biederman
2006-07-14 18:15 ` Trond Myklebust
2006-07-14 18:40 ` Eric W. Biederman
2006-07-14 21:04 ` Trond Myklebust
2006-07-15 4:09 ` Eric W. Biederman
2006-07-15 4:35 ` Kyle Moffett
2006-07-15 12:35 ` Eric W. Biederman
2006-07-15 13:25 ` Kyle Moffett
2006-07-15 15:54 ` Dave Hansen
2006-07-15 17:01 ` Trond Myklebust
2006-07-15 23:29 ` Eric W. Biederman
2006-07-16 16:18 ` Dave Hansen
2006-07-14 17:14 ` Eric W. Biederman
2006-07-16 8:36 ` Kirill Korotaev
2006-07-16 10:08 ` Eric W. Biederman
2006-07-14 17:05 ` Serge E. Hallyn
2006-07-14 17:50 ` Kyle Moffett
2006-07-15 11:33 ` Serge E. Hallyn
2006-07-14 17:56 ` Eric W. Biederman
2006-07-14 16:35 ` Dave Hansen
2006-07-13 21:41 ` Serge E. Hallyn
2006-07-14 3:52 ` Eric W. Biederman
2006-07-14 14:02 ` Serge E. Hallyn
2006-07-14 14:50 ` Eric W. Biederman
2006-07-14 16:39 ` Serge E. Hallyn
2006-07-14 17:18 ` Eric W. Biederman
2006-07-14 17:24 ` Dave Hansen
2006-07-14 18:06 ` Eric W. Biederman
2006-07-14 18:42 ` Dave Hansen [this message]
2006-07-14 19:07 ` Eric W. Biederman
2006-07-13 17:59 ` Eric W. Biederman
2006-07-13 21:22 ` Serge E. Hallyn
2006-07-14 3:50 ` Eric W. Biederman
2006-07-14 14:17 ` Serge E. Hallyn
2006-07-14 15:05 ` Eric W. Biederman
2006-07-14 16:46 ` Serge E. Hallyn
2006-07-14 16:58 ` Eric W. Biederman
2006-07-14 15:43 ` Kyle Moffett
2006-07-14 16:13 ` Eric W. Biederman
2006-07-11 7:50 ` [PATCH -mm 6/7] add the user namespace to the execns syscall Cedric Le Goater
2006-07-11 7:50 ` [PATCH -mm 7/7] forbid the use of the unshare syscall on ipc namespaces Cedric Le Goater
2006-07-11 14:10 ` Kirill Korotaev
2006-07-11 15:06 ` Cedric Le Goater
2006-07-11 8:02 ` [PATCH -mm 0/7] execns syscall and user namespace Arjan van de Ven
2006-07-11 8:42 ` Cedric Le Goater
2006-07-11 18:12 ` H. Peter Anvin
2006-07-11 18:26 ` Cedric Le Goater
2006-07-11 18:28 ` H. Peter Anvin
2006-07-11 19:50 ` Ulrich Drepper
2006-07-11 21:50 ` Cedric Le Goater
2006-07-11 21:57 ` H. Peter Anvin
2006-07-12 0:16 ` Ulrich Drepper
2006-07-12 0:25 ` H. Peter Anvin
2006-07-12 0:28 ` H. Peter Anvin
2006-07-11 20:22 ` Eric W. Biederman
2006-07-11 21:28 ` Cedric Le Goater
2006-07-12 3:24 ` Eric W. Biederman
2006-07-12 13:05 ` Cedric Le Goater
2006-07-12 16:56 ` Eric W. Biederman
2006-07-13 16:13 ` Cedric Le Goater
2006-07-12 11:11 ` Kirill Korotaev
2006-07-12 13:10 ` Cedric Le Goater
-- strict thread matches above, loose matches on Subject: below --
2006-07-15 17:39 [PATCH -mm 5/7] add " Al Boldi
2006-07-16 12:19 ` Kyle Moffett
2006-07-17 11:25 ` Al Boldi
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1152902522.314.47.camel@localhost.localdomain \
--to=haveblue@us.ibm.com \
--cc=akpm@osdl.org \
--cc=clg@fr.ibm.com \
--cc=dev@openvz.org \
--cc=ebiederm@xmission.com \
--cc=herbert@13thfloor.at \
--cc=linux-kernel@vger.kernel.org \
--cc=sam.vilain@catalyst.net.nz \
--cc=saw@sw.ru \
--cc=serue@us.ibm.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox