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Thu, 05 Nov 2026 16:07:12 +0000 Received: from offworld.tailf5af7a.ts.net (unknown [190.113.127.252]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: dave@stgolabs.net) by pdx1-sub0-mail-a210.dreamhost.com (Postfix) with ESMTPSA id 4jL6dV5wvmzHb; Thu, 5 Nov 2026 08:07:10 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=stgolabs.net; s=dreamhost; t=1793894832; bh=RR6cUu30dRjzG7THObAfGO+BE1opRHighwmsm3cn3Fo=; h=From:To:Cc:Subject:Date:Content-Transfer-Encoding; b=lsgzyWpush7UxXE0zRdEkj3HwwWj9sm0hQCgqsUWQ1Vg4TbMpqOhM9IOvDu9RGxLG fbElcoQY4CdHYwAizOtsz52kSU6jEOEUDH9h7ULuQ+pp/vSph6WXooAU7jt5MHI3Vf KdroKHjNmMH20/auA35l233a0G35Zzw6QuPQM/mrWiqieHH0L3fvRnkd/AfJuvqlJO RR1sSgdSUp1Bly53S3RR6kUdgkKgEk6gksuGLJaNx1SFx53SxqDBrx7t46cbvpHaW7 JJegeT9Ec0FauLUSgPd8I1Qu4keuqM3uwVURjSEcOjnGIp0lsZ3bEk5mX1FMwc2766 DZGuM7I7rFVhA== From: Davidlohr Bueso To: jk@codeconstruct.com.au, matt@codeconstruct.com.au, kuba@kernel.org, pabeni@redhat.com Cc: anisa.su@samsung.com, dave@stgolabs.net, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH net v2] mctp: accept MSG_CMSG_COMPAT in recvmsg Date: Thu, 5 Nov 2026 08:07:04 -0800 Message-Id: <20261105160704.2546031-1-dave@stgolabs.net> X-Mailer: git-send-email 2.39.5 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 32-bit userspace running on a 64-bit kernel is unable to receive MCTP messages on an AF_MCTP socket, even though sending succeeds. There is nothing for MCTP to do with it beyond not rejecting it, as af_packet, af_key and can/isotp already do, for example. Fixes: 833ef3b91de6 ("mctp: Populate socket implementation") Cc: stable@vger.kernel.org Signed-off-by: Davidlohr Bueso --- Found while testing 32bit support for libcxlmi Changes since v1: - target net and Cc stable - fix the corrupted hunk header net/mctp/af_mctp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/mctp/af_mctp.c b/net/mctp/af_mctp.c index 8af5e2b3c8d1..aa22c0860712 100644 --- a/net/mctp/af_mctp.c +++ b/net/mctp/af_mctp.c @@ -292,7 +292,7 @@ static int mctp_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, u8 type; int rc; - if (flags & ~(MSG_DONTWAIT | MSG_TRUNC | MSG_PEEK)) + if (flags & ~(MSG_DONTWAIT | MSG_TRUNC | MSG_PEEK | MSG_CMSG_COMPAT)) return -EOPNOTSUPP; skb = skb_recv_datagram(sk, flags, &rc); -- 2.39.5