From: Kees Cook <keescook@chromium.org>
To: David Laight <David.Laight@ACULAB.COM>
Cc: 'Sargun Dhillon' <sargun@sargun.me>,
Christian Brauner <christian.brauner@ubuntu.com>,
"containers@lists.linux-foundation.org"
<containers@lists.linux-foundation.org>,
Giuseppe Scrivano <gscrivan@redhat.com>,
Robert Sesek <rsesek@google.com>,
Chris Palmer <palmer@google.com>, Jann Horn <jannh@google.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Matt Denton <mpdenton@google.com>,
"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
Tejun Heo <tj@kernel.org>, Al Viro <viro@zeniv.linux.org.uk>,
"cgroups@vger.kernel.org" <cgroups@vger.kernel.org>,
"stable@vger.kernel.org" <stable@vger.kernel.org>,
"David S . Miller" <davem@davemloft.net>
Subject: Re: [PATCH v3 1/4] fs, net: Standardize on file_receive helper to move fds across processes
Date: Wed, 10 Jun 2020 20:02:42 -0700 [thread overview]
Message-ID: <202006102001.E9779DFA5B@keescook> (raw)
In-Reply-To: <40d76a9a4525414a8c9809cd29a7ba8e@AcuMS.aculab.com>
On Wed, Jun 10, 2020 at 08:48:45AM +0000, David Laight wrote:
> From: Sargun Dhillon
> > Sent: 10 June 2020 09:13
> In essence the 'copy_to_user' is done by the wrapper code.
> The code filling in the CMSG buffer can be considered to be
> writing a kernel buffer.
>
> IIRC other kernels (eg NetBSD) do the copies for ioctl() requests
> in the ioctl syscall wrapper.
> The IOW/IOR/IOWR flags have to be right.
Yeah, this seems like it'd make a lot more sense (and would have easily
caught the IOR/IOW issue pointed out later in the thread). I wonder how
insane it would be to try to fix that globally in the kernel...
--
Kees Cook
next prev parent reply other threads:[~2020-06-11 3:02 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-03 1:10 [PATCH v3 0/4] Add seccomp notifier ioctl that enables adding fds Sargun Dhillon
2020-06-03 1:10 ` [PATCH v3 1/4] fs, net: Standardize on file_receive helper to move fds across processes Sargun Dhillon
2020-06-04 1:24 ` Christian Brauner
2020-06-04 2:22 ` Kees Cook
2020-06-04 5:20 ` Sargun Dhillon
2020-06-04 12:52 ` Christian Brauner
2020-06-04 13:28 ` David Laight
2020-06-05 7:54 ` Sargun Dhillon
2020-06-09 19:43 ` Kees Cook
2020-06-09 20:03 ` Christian Brauner
2020-06-09 20:55 ` Kees Cook
2020-06-09 21:27 ` Christian Brauner
2020-06-10 5:27 ` Kees Cook
2020-06-10 8:12 ` Sargun Dhillon
2020-06-10 8:48 ` David Laight
2020-06-11 3:02 ` Kees Cook [this message]
2020-06-11 7:51 ` David Laight
2020-06-10 17:10 ` Kees Cook
2020-06-11 2:59 ` Kees Cook
2020-06-11 4:41 ` Sargun Dhillon
2020-06-11 9:19 ` Christian Brauner
2020-06-11 10:39 ` Sargun Dhillon
2020-06-11 23:23 ` Kees Cook
2020-06-11 10:01 ` Christian Brauner
2020-06-11 11:06 ` Sargun Dhillon
2020-06-11 14:42 ` Christian Brauner
2020-06-11 14:56 ` David Laight
2020-06-11 23:49 ` Kees Cook
2020-06-12 6:58 ` Kees Cook
2020-06-12 8:36 ` David Laight
2020-06-12 10:46 ` Sargun Dhillon
2020-06-12 15:13 ` Kees Cook
2020-06-12 15:55 ` David Laight
2020-06-12 18:28 ` Christian Brauner
2020-06-12 18:38 ` Kees Cook
2020-06-12 18:42 ` Christian Brauner
2020-06-15 8:27 ` David Laight
2020-06-10 9:30 ` Christian Brauner
2020-06-04 3:39 ` Sargun Dhillon
2020-06-03 1:10 ` [PATCH v3 2/4] pid: Use file_receive helper to copy FDs Sargun Dhillon
2020-06-03 1:10 ` [PATCH v3 3/4] seccomp: Introduce addfd ioctl to seccomp user notifier Sargun Dhillon
2020-06-03 1:10 ` [PATCH v3 4/4] selftests/seccomp: Test SECCOMP_IOCTL_NOTIF_ADDFD Sargun Dhillon
2020-06-03 21:25 ` [PATCH v3 0/4] Add seccomp notifier ioctl that enables adding fds Robert Sesek
2020-06-03 23:42 ` Kees Cook
2020-06-03 23:56 ` Sargun Dhillon
2020-06-04 2:44 ` Kees Cook
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