From: "Alexei Starovoitov" <alexei.starovoitov@gmail.com>
To: "Jiayuan Chen" <jiayuan.chen@linux.dev>, <bpf@vger.kernel.org>,
<netdev@vger.kernel.org>
Cc: <daniel@iogearbox.net>, <andrii@kernel.org>, <eddyz87@gmail.com>,
<memxor@gmail.com>, <john.fastabend@gmail.com>,
<jakub@cloudflare.com>, <davem@davemloft.net>,
<edumazet@kernel.org>, <kuba@kernel.org>, <pabeni@redhat.com>,
<horms@kernel.org>, <kuniyu@google.com>, <willemb@google.com>,
<matttbe@kernel.org>, <mptcp@lists.linux.dev>, <mason@kernel.org>,
<josef@toxicpanda.com>
Subject: Re: [PATCH bpf v2 07/15] bpf, sockmap: Check the target of an egress redirect before each send
Date: Mon, 02 Nov 2026 16:18:50 +0000 [thread overview]
Message-ID: <DMKV0IW3XAU1.3KSPCJSXR3Z3K@gmail.com> (raw)
In-Reply-To: <69e66c9c-f2ab-41a7-972d-d1562a6387b8@linux.dev>
On Mon, Nov 02, 2026 at 04:32 AM Jiayuan Chen <jiayuan.chen@linux.dev> wrote:
> I can trigger it by redirecting data to a non-accept sk.
>
> ==================================================================
> BUG: KASAN: null-ptr-deref in tcp_sendmsg_locked+0xfb8/0x4550
> Write of size 8 at addr 0000000000000008 by task repro/488
Thanks for testing.
All patches have reproducers.
I didn't share them, hough it's a weak defense.
Anyone can build a repro from the patch.
next prev parent reply other threads:[~2026-11-02 16:18 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-11-02 7:20 [PATCH bpf v2 00/15] bpf, sockmap: Fixes for verdicts, redirects, corks and recvmsg() Alexei Starovoitov
2026-11-02 7:20 ` [PATCH bpf v2 01/15] bpf, sockmap: Write sg.start when recvmsg() faults Alexei Starovoitov
2026-11-02 8:32 ` Jiayuan Chen
2026-11-02 7:20 ` [PATCH bpf v2 02/15] bpf, sockmap: Don't let an SK_DROP verdict stick Alexei Starovoitov
2026-11-02 8:45 ` Jiayuan Chen
2026-11-02 18:47 ` John Fastabend
2026-11-02 7:21 ` [PATCH bpf v2 03/15] bpf, sockmap: Don't let an SK_PASS verdict cover the next message Alexei Starovoitov
2026-11-02 18:51 ` John Fastabend
2026-11-02 22:44 ` Alexei Starovoitov
2026-11-02 7:21 ` [PATCH bpf v2 04/15] bpf, sockmap: Subtract all dropped bytes from the return value Alexei Starovoitov
2026-11-02 11:19 ` Jiayuan Chen
2026-11-02 19:12 ` John Fastabend
2026-11-02 7:21 ` [PATCH bpf v2 05/15] bpf, sockmap: Clear the resume state of a stopped psock Alexei Starovoitov
2026-11-02 11:40 ` Jiayuan Chen
2026-11-02 19:16 ` John Fastabend
2026-11-02 7:21 ` [PATCH bpf v2 06/15] bpf, sockmap: Give no progs to a TCP listener Alexei Starovoitov
2026-11-02 12:00 ` Jiayuan Chen
2026-11-02 19:31 ` John Fastabend
2026-11-02 7:21 ` [PATCH bpf v2 07/15] bpf, sockmap: Check the target of an egress redirect before each send Alexei Starovoitov
2026-11-02 12:32 ` Jiayuan Chen
2026-11-02 16:18 ` Alexei Starovoitov [this message]
2026-11-02 19:36 ` John Fastabend
2026-11-02 7:21 ` [PATCH bpf v2 08/15] net: Leave sk_stream_wait_memory() once the socket is dead Alexei Starovoitov
2026-11-02 12:54 ` Jiayuan Chen
2026-11-02 7:21 ` [PATCH bpf v2 09/15] bpf, sockmap: Check the TCP state in recvmsg() Alexei Starovoitov
2026-11-02 15:15 ` Jiayuan Chen
2026-11-02 16:57 ` Matthieu Baerts
2026-11-02 7:21 ` [PATCH bpf v2 10/15] bpf, sockmap: Reset the copy position when corking Alexei Starovoitov
2026-11-03 1:39 ` Jiayuan Chen
2026-11-02 7:21 ` [PATCH bpf v2 11/15] bpf, sockmap: Don't copy 0 bytes into a full cork Alexei Starovoitov
2026-11-03 1:41 ` Jiayuan Chen
2026-11-02 7:21 ` [PATCH bpf v2 12/15] bpf, sockmap: Clear the redirect target before the sk_msg prog runs Alexei Starovoitov
2026-11-03 1:58 ` Jiayuan Chen
2026-11-02 7:21 ` [PATCH bpf v2 13/15] bpf, sockmap: Check that the redirected message is the cork Alexei Starovoitov
2026-11-03 2:07 ` Jiayuan Chen
2026-11-02 7:21 ` [PATCH bpf v2 14/15] bpf, sockmap: Keep the rest of the cork after a redirect Alexei Starovoitov
2026-11-03 2:25 ` Jiayuan Chen
2026-11-02 7:21 ` [PATCH bpf v2 15/15] bpf, sockmap: Clear the end mark of elements added by push and pop Alexei Starovoitov
2026-11-03 2:51 ` Jiayuan Chen
2026-11-02 9:29 ` [PATCH bpf v2 00/15] bpf, sockmap: Fixes for verdicts, redirects, corks and recvmsg() MPTCP CI
2026-11-02 20:11 ` John Fastabend
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=DMKV0IW3XAU1.3KSPCJSXR3Z3K@gmail.com \
--to=alexei.starovoitov@gmail.com \
--cc=andrii@kernel.org \
--cc=bpf@vger.kernel.org \
--cc=daniel@iogearbox.net \
--cc=davem@davemloft.net \
--cc=eddyz87@gmail.com \
--cc=edumazet@kernel.org \
--cc=horms@kernel.org \
--cc=jakub@cloudflare.com \
--cc=jiayuan.chen@linux.dev \
--cc=john.fastabend@gmail.com \
--cc=josef@toxicpanda.com \
--cc=kuba@kernel.org \
--cc=kuniyu@google.com \
--cc=mason@kernel.org \
--cc=matttbe@kernel.org \
--cc=memxor@gmail.com \
--cc=mptcp@lists.linux.dev \
--cc=netdev@vger.kernel.org \
--cc=pabeni@redhat.com \
--cc=willemb@google.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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.