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Sun, 01 Nov 2026 20:03:40 +0000 Received: from offworld.tailf5af7a.ts.net (unknown [76.167.199.67]) (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-a223.dreamhost.com (Postfix) with ESMTPSA id 4jHm4C1hTLz2l; Sun, 1 Nov 2026 12:03:39 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=stgolabs.net; s=dreamhost; t=1793563419; bh=twrovwkisuWHeA+hGeSowB1A1+M8W4ArMTje1ckj7P4=; h=From:To:Cc:Subject:Date:Content-Transfer-Encoding; b=KiCyJ8/0g7uHk3/o5RRKkMQ8FX6ukey6J3ji3gM+q6blmCjzCyWwHpyug4EwT+Vk2 JPSGF0lk+jSIMZXFN/LE9s2b6yS6ZppjMXGVhICnaEi7316+DheRXGz1NgDdB1pAxP rsjwdrkpgBDesRxkTEmTGkJUgf9rk5cCBeU1O5Xz2U874PfmrlyKw7UvgkEj5iafac 77Lc60QEP0275/5+MowuU05ou4gUNWahRwSf6IZJ9qFFp06CKz3EFfrZzibDNujbgb M10ufZopKzEjW6Szlfy4SP0NKA993bMeym4+drtrSaS1I1As99Er1iabUNcMIRLRaA gw6FynCAk2SSA== 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 Subject: [PATCH] mctp: accept MSG_CMSG_COMPAT in recvmsg Date: Sun, 1 Nov 2026 12:03:31 -0800 Message-Id: <20261101200331.1956836-1-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") Signed-off-by: Davidlohr Bueso --- 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 @@ -292,8 +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