From: Martin KaFai Lau <martin.lau@linux.dev>
To: Werner Kasselman <werner@verivus.ai>
Cc: "bpf@vger.kernel.org" <bpf@vger.kernel.org>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"andrii@kernel.org" <andrii@kernel.org>,
"ast@kernel.org" <ast@kernel.org>,
"brakmo@fb.com" <brakmo@fb.com>,
"daniel@iogearbox.net" <daniel@iogearbox.net>,
"davem@davemloft.net" <davem@davemloft.net>,
"eddyz87@gmail.com" <eddyz87@gmail.com>,
"edumazet@google.com" <edumazet@google.com>,
"haoluo@google.com" <haoluo@google.com>,
"horms@kernel.org" <horms@kernel.org>,
"john.fastabend@gmail.com" <john.fastabend@gmail.com>,
"jolsa@kernel.org" <jolsa@kernel.org>,
"kpsingh@kernel.org" <kpsingh@kernel.org>,
"kuba@kernel.org" <kuba@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-kselftest@vger.kernel.org"
<linux-kselftest@vger.kernel.org>,
"pabeni@redhat.com" <pabeni@redhat.com>,
"sdf@fomichev.me" <sdf@fomichev.me>,
"shuah@kernel.org" <shuah@kernel.org>,
"song@kernel.org" <song@kernel.org>,
"yonghong.song@linux.dev" <yonghong.song@linux.dev>,
"jiayuan.chen@linux.dev" <jiayuan.chen@linux.dev>,
"stable@vger.kernel.org" <stable@vger.kernel.org>
Subject: Re: [PATCH 2/2] bpf: guard sock_ops rtt_min against non-locked tcp_sock
Date: Mon, 20 Apr 2026 13:43:36 -0700 [thread overview]
Message-ID: <202642020410.q7GJ.martin.lau@linux.dev> (raw)
In-Reply-To: <20260417023119.3830723-3-werner@verivus.com>
On Fri, Apr 17, 2026 at 02:31:26AM +0000, Werner Kasselman wrote:
> diff --git a/net/core/filter.c b/net/core/filter.c
> index e8ad062f63bc..9c43193a5c39 100644
> --- a/net/core/filter.c
> +++ b/net/core/filter.c
> @@ -10827,14 +10827,12 @@ static u32 sock_ops_convert_ctx_access(enum bpf_access_type type,
> sizeof(struct minmax));
> BUILD_BUG_ON(sizeof(struct minmax) <
> sizeof(struct minmax_sample));
> + BUILD_BUG_ON(offsetof(struct tcp_sock, rtt_min) +
> + offsetof(struct minmax_sample, v) > S16_MAX);
This doesn't look like a test that is added by human.
Will sizeof(tcp_sock) ever reach S16_MAX? It is unnecessarily defensive and
inconsistent with other tcp_sock field loads.
> diff --git a/tools/testing/selftests/bpf/prog_tests/sock_ops_get_sk.c b/tools/testing/selftests/bpf/prog_tests/sock_ops_get_sk.c
> index 343d92c4df30..1aea4c97d5d3 100644
> --- a/tools/testing/selftests/bpf/prog_tests/sock_ops_get_sk.c
> +++ b/tools/testing/selftests/bpf/prog_tests/sock_ops_get_sk.c
Separate the test in its own patch.
Also tag and add revision to subject, "[PATCH v3 bpf...]".
Take a look at how other patches are posted in the bpf mailing list.
pw-bot: cr
next prev parent reply other threads:[~2026-04-20 20:43 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-17 2:31 [PATCH bpf v3 0/2] bpf: fix sock_ops rtt_min OOB read Werner Kasselman
2026-04-17 2:31 ` [PATCH 1/2] bpf: extract SOCK_OPS_LOAD_TCP_SOCK_FIELD from SOCK_OPS_GET_FIELD Werner Kasselman
2026-04-17 2:31 ` [PATCH 2/2] bpf: guard sock_ops rtt_min against non-locked tcp_sock Werner Kasselman
2026-04-20 20:43 ` Martin KaFai Lau [this message]
[not found] ` <20260420221621.1441707-1-werner@verivus.com>
2026-04-20 22:16 ` [PATCH bpf v4 1/2] " Werner Kasselman
2026-04-20 22:16 ` [PATCH bpf v4 2/2] selftests/bpf: cover same-reg sock_ops rtt_min request_sock access Werner Kasselman
[not found] ` <20260420230030.2802408-1-werner@verivus.com>
2026-04-20 23:00 ` [PATCH bpf v5 1/2] bpf: guard sock_ops rtt_min against non-locked tcp_sock Werner Kasselman
2026-04-20 23:00 ` [PATCH bpf v5 2/2] selftests/bpf: cover same-reg sock_ops rtt_min request_sock access Werner Kasselman
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=202642020410.q7GJ.martin.lau@linux.dev \
--to=martin.lau@linux.dev \
--cc=andrii@kernel.org \
--cc=ast@kernel.org \
--cc=bpf@vger.kernel.org \
--cc=brakmo@fb.com \
--cc=daniel@iogearbox.net \
--cc=davem@davemloft.net \
--cc=eddyz87@gmail.com \
--cc=edumazet@google.com \
--cc=haoluo@google.com \
--cc=horms@kernel.org \
--cc=jiayuan.chen@linux.dev \
--cc=john.fastabend@gmail.com \
--cc=jolsa@kernel.org \
--cc=kpsingh@kernel.org \
--cc=kuba@kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-kselftest@vger.kernel.org \
--cc=netdev@vger.kernel.org \
--cc=pabeni@redhat.com \
--cc=sdf@fomichev.me \
--cc=shuah@kernel.org \
--cc=song@kernel.org \
--cc=stable@vger.kernel.org \
--cc=werner@verivus.ai \
--cc=yonghong.song@linux.dev \
/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