From: Kees Cook <keescook@chromium.org>
To: Christian Brauner <christian.brauner@ubuntu.com>
Cc: Jann Horn <jannh@google.com>, Sargun Dhillon <sargun@sargun.me>,
Linux Containers <containers@lists.linux-foundation.org>,
Aleksa Sarai <cyphar@cyphar.com>,
Jeffrey Vander Stoep <jeffv@google.com>,
Linux API <linux-api@vger.kernel.org>,
kernel list <linux-kernel@vger.kernel.org>,
Chris Palmer <palmer@google.com>,
Robert Sesek <rsesek@google.com>, Tycho Andersen <tycho@tycho.ws>,
Matt Denton <mpdenton@google.com>,
Al Viro <viro@zeniv.linux.org.uk>
Subject: Re: [PATCH v2 2/3] seccomp: Introduce addfd ioctl to seccomp user notifier
Date: Sat, 30 May 2020 09:09:29 -0700 [thread overview]
Message-ID: <202005300908.303040EF9@keescook> (raw)
In-Reply-To: <20200530135827.cxltfmiqara4yaki@wittgenstein>
On Sat, May 30, 2020 at 03:58:27PM +0200, Christian Brauner wrote:
> On Sat, May 30, 2020 at 05:17:24AM +0200, Jann Horn wrote:
> > On Sat, May 30, 2020 at 4:43 AM Kees Cook <keescook@chromium.org> wrote:
> > > I mean, yes, that's certainly better, but it just seems a shame that
> > > everyone has to do the get_unused/put_unused dance just because of how
> > > SCM_RIGHTS does this weird put_user() in the middle.
> > >
> > > Can anyone clarify the expected failure mode from SCM_RIGHTS? Can we
> > > move the put_user() after instead?
> >
> > Honestly, I think trying to remove file descriptors and such after
> > -EFAULT is a waste of time. If userspace runs into -EFAULT, userspace
> [...]
>
> There's really no point in trying to save a broken scm message imho.
Right -- my concern is about stuffing a fd into a process without it
knowing (this is likely an overly paranoid concern, given that if the
process is getting EFAULT at the end of a list of fds, all the prior
ones will be installed too..)
--
Kees Cook
next prev parent reply other threads:[~2020-05-30 16:09 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-28 11:08 [PATCH v2 0/3] Add seccomp notifier ioctl that enables adding fds Sargun Dhillon
2020-05-28 11:08 ` [PATCH v2 1/3] seccomp: Add find_notification helper Sargun Dhillon
2020-05-29 6:23 ` Kees Cook
2020-05-29 17:40 ` Sargun Dhillon
2020-05-29 20:14 ` Kees Cook
2020-05-29 9:57 ` Christian Brauner
2020-05-28 11:08 ` [PATCH v2 2/3] seccomp: Introduce addfd ioctl to seccomp user notifier Sargun Dhillon
2020-05-29 7:31 ` Kees Cook
2020-05-29 7:38 ` Christian Brauner
2020-05-29 7:45 ` Kees Cook
2020-05-30 1:10 ` Sargun Dhillon
2020-05-30 2:43 ` Kees Cook
2020-05-30 3:17 ` Jann Horn
2020-05-30 5:22 ` Kees Cook
2020-05-30 13:58 ` Christian Brauner
2020-05-30 16:09 ` Kees Cook [this message]
2020-05-30 3:58 ` Sargun Dhillon
2020-05-30 5:47 ` Kees Cook
2020-05-30 14:13 ` Christian Brauner
2020-05-30 16:14 ` Kees Cook
2020-05-30 16:21 ` Christian Brauner
2020-05-30 14:08 ` Al Viro
2020-05-30 16:07 ` Kees Cook
2020-06-01 19:02 ` Sargun Dhillon
2020-06-01 19:59 ` Kees Cook
2020-05-29 9:24 ` Giuseppe Scrivano
2020-05-29 10:32 ` Christian Brauner
2020-05-29 13:31 ` Christian Brauner
2020-05-29 22:35 ` Sargun Dhillon
2020-05-28 11:08 ` [PATCH v2 3/3] selftests/seccomp: Test SECCOMP_IOCTL_NOTIF_ADDFD Sargun Dhillon
2020-05-29 7:41 ` Kees Cook
2020-05-29 13:29 ` Tycho Andersen
2020-05-29 18:46 ` Sargun Dhillon
2020-05-29 19:12 ` Tycho Andersen
2020-05-29 20:09 ` Kees Cook
2020-05-29 13:30 ` [PATCH v2 0/3] Add seccomp notifier ioctl that enables adding fds Tycho Andersen
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