From: Stanislav Fomichev <sdf@fomichev•me>
To: Tze-nan Wu <Tze-nan.Wu@mediatek•com>
Cc: netdev@vger•kernel.org, bpf@vger•kernel.org,
Alexei Starovoitov <ast@kernel•org>,
alexei.starovoitov@gmail•com, bobule.chang@mediatek•com,
wsd_upstream@mediatek•com, linux-kernel@vger•kernel.org,
linux-mediatek@lists•infradead.org,
Kuniyuki Iwashima <kuniyu@amazon•com>,
chen-yao.chang@mediatek•com, Yanghui Li <yanghui.li@mediatek•com>,
Cheng-Jui Wang <cheng-jui.wang@mediatek•com>,
Daniel Borkmann <daniel@iogearbox•net>,
John Fastabend <john.fastabend@gmail•com>,
Andrii Nakryiko <andrii@kernel•org>,
Martin KaFai Lau <martin.lau@linux•dev>,
Eduard Zingerman <eddyz87@gmail•com>, Song Liu <song@kernel•org>,
Yonghong Song <yonghong.song@linux•dev>,
KP Singh <kpsingh@kernel•org>, Hao Luo <haoluo@google•com>,
Jiri Olsa <jolsa@kernel•org>,
"David S. Miller" <davem@davemloft•net>,
Eric Dumazet <edumazet@google•com>,
Jakub Kicinski <kuba@kernel•org>, Paolo Abeni <pabeni@redhat•com>,
Matthias Brugger <matthias.bgg@gmail•com>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@collabora•com>,
linux-arm-kernel@lists•infradead.org
Subject: Re: [PATCH net v5] bpf, net: Fix a potential race in do_sock_getsockopt()
Date: Fri, 30 Aug 2024 20:29:04 -0700 [thread overview]
Message-ID: <ZtKOAKlNalVLIz2E@mini-arch> (raw)
In-Reply-To: <20240830082518.23243-1-Tze-nan.Wu@mediatek.com>
On 08/30, Tze-nan Wu wrote:
> There's a potential race when `cgroup_bpf_enabled(CGROUP_GETSOCKOPT)` is
> false during the execution of `BPF_CGROUP_GETSOCKOPT_MAX_OPTLEN`, but
> becomes true when `BPF_CGROUP_RUN_PROG_GETSOCKOPT` is called.
> This inconsistency can lead to `BPF_CGROUP_RUN_PROG_GETSOCKOPT` receiving
> an "-EFAULT" from `__cgroup_bpf_run_filter_getsockopt(max_optlen=0)`.
> Scenario shown as below:
>
> `process A` `process B`
> ----------- ------------
> BPF_CGROUP_GETSOCKOPT_MAX_OPTLEN
> enable CGROUP_GETSOCKOPT
> BPF_CGROUP_RUN_PROG_GETSOCKOPT (-EFAULT)
>
> To resolve this, remove the `BPF_CGROUP_GETSOCKOPT_MAX_OPTLEN` macro and
> directly uses `copy_from_sockptr` to ensure that `max_optlen` is always
> set before `BPF_CGROUP_RUN_PROG_GETSOCKOPT` is invoked.
>
> Fixes: 0d01da6afc54 ("bpf: implement getsockopt and setsockopt hooks")
> Co-developed-by: Yanghui Li <yanghui.li@mediatek•com>
> Signed-off-by: Yanghui Li <yanghui.li@mediatek•com>
> Co-developed-by: Cheng-Jui Wang <cheng-jui.wang@mediatek•com>
> Signed-off-by: Cheng-Jui Wang <cheng-jui.wang@mediatek•com>
> Signed-off-by: Tze-nan Wu <Tze-nan.Wu@mediatek•com>
Acked-by: Stanislav Fomichev <sdf@fomichev•me>
next prev parent reply other threads:[~2024-08-31 3:29 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-08-30 8:25 [PATCH net v5] bpf, net: Fix a potential race in do_sock_getsockopt() Tze-nan Wu
2024-08-31 3:29 ` Stanislav Fomichev [this message]
2024-08-31 22:06 ` Alexei Starovoitov
2024-09-03 20:10 ` patchwork-bot+netdevbpf
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=ZtKOAKlNalVLIz2E@mini-arch \
--to=sdf@fomichev$(echo .)me \
--cc=Tze-nan.Wu@mediatek$(echo .)com \
--cc=alexei.starovoitov@gmail$(echo .)com \
--cc=andrii@kernel$(echo .)org \
--cc=angelogioacchino.delregno@collabora$(echo .)com \
--cc=ast@kernel$(echo .)org \
--cc=bobule.chang@mediatek$(echo .)com \
--cc=bpf@vger$(echo .)kernel.org \
--cc=chen-yao.chang@mediatek$(echo .)com \
--cc=cheng-jui.wang@mediatek$(echo .)com \
--cc=daniel@iogearbox$(echo .)net \
--cc=davem@davemloft$(echo .)net \
--cc=eddyz87@gmail$(echo .)com \
--cc=edumazet@google$(echo .)com \
--cc=haoluo@google$(echo .)com \
--cc=john.fastabend@gmail$(echo .)com \
--cc=jolsa@kernel$(echo .)org \
--cc=kpsingh@kernel$(echo .)org \
--cc=kuba@kernel$(echo .)org \
--cc=kuniyu@amazon$(echo .)com \
--cc=linux-arm-kernel@lists$(echo .)infradead.org \
--cc=linux-kernel@vger$(echo .)kernel.org \
--cc=linux-mediatek@lists$(echo .)infradead.org \
--cc=martin.lau@linux$(echo .)dev \
--cc=matthias.bgg@gmail$(echo .)com \
--cc=netdev@vger$(echo .)kernel.org \
--cc=pabeni@redhat$(echo .)com \
--cc=song@kernel$(echo .)org \
--cc=wsd_upstream@mediatek$(echo .)com \
--cc=yanghui.li@mediatek$(echo .)com \
--cc=yonghong.song@linux$(echo .)dev \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
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