From: Christian Brauner <christian.brauner@ubuntu.com>
To: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Cc: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>, bpf <bpf@vger.kernel.org>,
Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
Yonghong Song <yhs@fb.com>,
Network Development <netdev@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 0/3] bpf: switch to new usercopy helpers
Date: Thu, 10 Oct 2019 11:26:48 +0200 [thread overview]
Message-ID: <20191010092647.cpxh7neqgabq36gt@wittgenstein> (raw)
In-Reply-To: <CAADnVQJxUwD3u+tK1xsU2thpRWiAbERGx8mMoXKOCfNZrETMuw@mail.gmail.com>
On Wed, Oct 09, 2019 at 04:06:18PM -0700, Alexei Starovoitov wrote:
> On Wed, Oct 9, 2019 at 9:09 AM Christian Brauner
> <christian.brauner@ubuntu.com> wrote:
> >
> > Hey everyone,
> >
> > In v5.4-rc2 we added two new helpers check_zeroed_user() and
> > copy_struct_from_user() including selftests (cf. [1]). It is a generic
> > interface designed to copy a struct from userspace. The helpers will be
> > especially useful for structs versioned by size of which we have quite a
> > few.
> >
> > The most obvious benefit is that this helper lets us get rid of
> > duplicate code. We've already switched over sched_setattr(), perf_event_open(),
> > and clone3(). More importantly it will also help to ensure that users
> > implementing versioning-by-size end up with the same core semantics.
> >
> > This point is especially crucial since we have at least one case where
> > versioning-by-size is used but with slighly different semantics:
> > sched_setattr(), perf_event_open(), and clone3() all do do similar
> > checks to copy_struct_from_user() while rt_sigprocmask(2) always rejects
> > differently-sized struct arguments.
> >
> > This little series switches over bpf codepaths that have hand-rolled
> > implementations of these helpers.
>
> check_zeroed_user() is not in bpf-next.
> we will let this set sit in patchworks for some time until bpf-next
> is merged back into net-next and we fast forward it.
> Then we can apply it (assuming no conflicts).
Sounds good to me. Just ping me when you need me to resend rebase onto
bpf-next.
Christian
next prev parent reply other threads:[~2019-10-10 9:26 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-09 16:09 [PATCH 0/3] bpf: switch to new usercopy helpers Christian Brauner
2019-10-09 16:09 ` [PATCH 1/3] bpf: use check_zeroed_user() in bpf_check_uarg_tail_zero() Christian Brauner
2019-10-10 10:50 ` Aleksa Sarai
2019-10-09 16:09 ` [PATCH 2/3] bpf: use copy_struct_from_user() in bpf_prog_get_info_by_fd() Christian Brauner
2019-10-10 10:51 ` Aleksa Sarai
2019-10-09 16:09 ` [PATCH 3/3] bpf: use copy_struct_from_user() in bpf() syscall Christian Brauner
2019-10-10 10:51 ` Aleksa Sarai
2019-10-09 23:06 ` [PATCH 0/3] bpf: switch to new usercopy helpers Alexei Starovoitov
2019-10-10 9:26 ` Christian Brauner [this message]
2019-10-15 22:45 ` Alexei Starovoitov
2019-10-15 22:55 ` Christian Brauner
2019-10-15 23:02 ` Alexei Starovoitov
2019-10-15 23:08 ` Christian Brauner
2019-10-16 0:41 ` [PATCH v2 " Christian Brauner
2019-10-16 0:41 ` [PATCH v2 1/3] bpf: use check_zeroed_user() in bpf_check_uarg_tail_zero() Christian Brauner
2019-10-16 0:41 ` [PATCH v2 2/3] bpf: use copy_struct_from_user() in bpf_prog_get_info_by_fd() Christian Brauner
2019-10-16 0:41 ` [PATCH v2 3/3] bpf: use copy_struct_from_user() in bpf() syscall Christian Brauner
2019-10-16 0:48 ` [PATCH v2 0/3] bpf: switch to new usercopy helpers Christian Brauner
2019-10-16 2:14 ` Alexei Starovoitov
2019-10-16 3:31 ` Christian Brauner
2019-10-16 3:44 ` [PATCH v3 " Christian Brauner
2019-10-16 3:44 ` [PATCH v3 1/3] bpf: use check_zeroed_user() in bpf_check_uarg_tail_zero() Christian Brauner
2019-10-16 5:23 ` Alexei Starovoitov
2019-10-16 3:44 ` [PATCH v3 2/3] bpf: use copy_struct_from_user() in bpf_prog_get_info_by_fd() Christian Brauner
2019-10-16 5:25 ` Alexei Starovoitov
2019-10-16 7:30 ` [PATCH v3 2/3] bpf: use copy_struct_from_user() in bpf_prog_get_info_by_fd()y Christian Brauner
2019-10-16 7:43 ` [PATCH v3 2/3] bpf: use copy_struct_from_user() in bpf_prog_get_info_by_fd() Christian Brauner
2019-10-16 3:44 ` [PATCH v3 3/3] bpf: use copy_struct_from_user() in bpf() syscall Christian Brauner
2019-10-16 11:18 ` [PATCH bpf-next v4 0/3] bpf: switch to new usercopy helpers Christian Brauner
2019-10-16 11:18 ` [PATCH bpf-next v4 1/3] bpf: use check_zeroed_user() in bpf_check_uarg_tail_zero() Christian Brauner
2019-10-16 11:18 ` [PATCH bpf-next v4 2/3] bpf: use copy_struct_from_user() in bpf_prog_get_info_by_fd() Christian Brauner
2019-10-16 11:18 ` [PATCH bpf-next v4 3/3] bpf: use copy_struct_from_user() in bpf() syscall Christian Brauner
2019-10-16 18:31 ` [PATCH bpf-next v4 0/3] bpf: switch to new usercopy helpers Alexei Starovoitov
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=20191010092647.cpxh7neqgabq36gt@wittgenstein \
--to=christian.brauner@ubuntu.com \
--cc=alexei.starovoitov@gmail.com \
--cc=ast@kernel.org \
--cc=bpf@vger.kernel.org \
--cc=daniel@iogearbox.net \
--cc=kafai@fb.com \
--cc=linux-kernel@vger.kernel.org \
--cc=netdev@vger.kernel.org \
--cc=songliubraving@fb.com \
--cc=yhs@fb.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;
as well as URLs for NNTP newsgroup(s).