From: Jann Horn <jann@thejh.net>
To: Andy Lutomirski <luto@amacapital.net>
Cc: Peter Zijlstra <peterz@infradead.org>,
Andy Lutomirski <luto@kernel.org>, X86 ML <x86@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Brian Gerst <brgerst@gmail.com>, Borislav Petkov <bp@alien8.de>,
Linux API <linux-api@vger.kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Kees Cook <keescook@chromium.org>,
Tycho Andersen <tycho.andersen@canonical.com>,
Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Subject: Re: [PATCH 1/3] proc: Stop reporting eip and esp in /proc/PID/stat
Date: Sat, 1 Oct 2016 12:37:28 +0200 [thread overview]
Message-ID: <20161001103728.GM14666@pc.thejh.net> (raw)
In-Reply-To: <CALCETrUBmsoUK5Shkjwo6n=BGaHFtZhhUZ=2uOcAzWUend-BXg@mail.gmail.com>
[-- Attachment #1: Type: text/plain, Size: 1091 bytes --]
On Fri, Sep 30, 2016 at 07:01:13PM -0700, Andy Lutomirski wrote:
> On an unrelated note, can we please lock down all the silly historical
> *userspace* info leaks in /proc? Nasty ones include: net, cmdline (at
> the very least, only argv[0] should be visible if the reader lacks
> ptrace access).
>
> Less nasty ones include: limits, sched, autogroup, comm, wchan,
> schedstat, cpuset, cgroup, oom_*, sessionid, coredump_filter
If that doesn't break stuff, I'm very much in favor of it.
> uid_map, gid_map, etc are just screwed up. They should be per
> *namespace* somewhere, and they should require creds on the namespace.
What do you have in mind? Something like
/proc/namespaces/user:123456/{uid_map,gid_map,setgroups,parent_ns},
with jumped fake symlinks to the directory and its entries in /proc/$pid/?
> timerslack is totally fscked up -- it allows ugo to write and it
> checks the wrong creds. Jann, does your series fix that?
Nope. Never noticed that thing so far, probably because it was only
added a few months ago. :/ Will add it to my series.
[-- Attachment #2: Digital signature --]
[-- Type: application/pgp-signature, Size: 819 bytes --]
next prev parent reply other threads:[~2016-10-01 10:37 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-30 17:58 [PATCH 0/3] ABI CHANGE!!! Remove questionable remote SP reads Andy Lutomirski
2016-09-30 17:58 ` [PATCH 1/3] proc: Stop reporting eip and esp in /proc/PID/stat Andy Lutomirski
2016-09-30 18:56 ` Jann Horn
2016-10-01 2:01 ` Andy Lutomirski
2016-10-01 4:22 ` Linus Torvalds
2016-10-01 10:37 ` Jann Horn [this message]
2016-10-14 18:25 ` Andy Lutomirski
2016-10-14 20:01 ` Tycho Andersen
2016-10-20 11:13 ` [tip:mm/urgent] fs/proc: " tip-bot for Andy Lutomirski
2016-11-01 14:36 ` [4.9-rc3] BUG: unable to handle kernel paging request at ffffc900144dfc60 Tetsuo Handa
2016-11-01 23:47 ` Linus Torvalds
2016-11-02 10:50 ` Tetsuo Handa
2016-11-02 14:05 ` Andy Lutomirski
2016-11-02 14:54 ` Linus Torvalds
2016-11-03 6:32 ` Ingo Molnar
2016-11-03 7:09 ` [tip:sched/urgent] sched/core: Fix oops in sched_show_task() tip-bot for Tetsuo Handa
2016-11-03 7:10 ` [tip:sched/urgent] sched/core: Remove pointless printout " tip-bot for Linus Torvalds
2016-09-30 17:58 ` [PATCH 2/3] proc: Stop trying to report thread stacks Andy Lutomirski
2016-10-20 11:13 ` [tip:mm/urgent] fs/proc: " tip-bot for Andy Lutomirski
2016-09-30 17:58 ` [PATCH 3/3] mm: Change vm_is_stack_for_task() to vm_is_stack_for_current() Andy Lutomirski
2016-10-20 11:14 ` [tip:mm/urgent] " tip-bot for Andy Lutomirski
2016-10-03 23:08 ` [PATCH 0/3] ABI CHANGE!!! Remove questionable remote SP reads Andy Lutomirski
2016-10-03 23:17 ` Linus Torvalds
2016-10-04 7:06 ` Raymond Jennings
2016-10-14 18:26 ` Andy Lutomirski
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=20161001103728.GM14666@pc.thejh.net \
--to=jann@thejh.net \
--cc=bp@alien8.de \
--cc=brgerst@gmail.com \
--cc=keescook@chromium.org \
--cc=linux-api@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=luto@amacapital.net \
--cc=luto@kernel.org \
--cc=penguin-kernel@i-love.sakura.ne.jp \
--cc=peterz@infradead.org \
--cc=torvalds@linux-foundation.org \
--cc=tycho.andersen@canonical.com \
--cc=x86@kernel.org \
/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;
as well as URLs for NNTP newsgroup(s).