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Tue, 18 Jun 2024 03:01:21 -0700 (PDT) X-Google-Smtp-Source: AGHT+IHmtXszET61iFbPQN51P1efzJtKtJvKWlDgM6gA6jKyWAFKYbF2w3oZEwnOgXPh4rlS/UKAyA== X-Received: by 2002:a2e:a603:0:b0:2ec:1b9a:6981 with SMTP id 38308e7fff4ca-2ec1b9a6a5amr66199201fa.7.1718704881259; Tue, 18 Jun 2024 03:01:21 -0700 (PDT) From: Stefano Garzarella To: qemu-devel@nongnu.org, mst@redhat.com Cc: Coiby Xu , Kevin Wolf , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , stefanha@redhat.com, Markus Armbruster , slp@redhat.com, Eduardo Habkost , David Hildenbrand , Raphael Norwitz , =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , =?UTF-8?q?Daniel=20P=2E=20Berrang=C3=A9?= , Igor Mammedov , Gerd Hoffmann , Thomas Huth , qemu-block@nongnu.org, Brad Smith , Hanna Reitz , Eric Blake , gmaglione@redhat.com, Paolo Bonzini , Jason Wang , Laurent Vivier , Stefano Garzarella Subject: [PATCH v8 04/13] libvhost-user: mask F_INFLIGHT_SHMFD if memfd is not supported Date: Tue, 18 Jun 2024 12:00:34 +0200 Message-ID: <20240618100043.144657-5-sgarzare@redhat.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240618100043.144657-1-sgarzare@redhat.com> References: <20240618100043.144657-1-sgarzare@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=sgarzare@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -22 X-Spam_score: -2.3 X-Spam_bar: -- X-Spam_report: (-2.3 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.148, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1718704937929100005 libvhost-user will panic when receiving VHOST_USER_GET_INFLIGHT_FD message if MFD_ALLOW_SEALING is not defined, since it's not able to create a memfd. VHOST_USER_GET_INFLIGHT_FD is used only if VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD is negotiated. So, let's mask that feature if the backend is not able to properly handle these messages. Reviewed-by: Philippe Mathieu-Daud=C3=A9 Tested-by: Philippe Mathieu-Daud=C3=A9 Acked-by: Stefan Hajnoczi Reviewed-by: David Hildenbrand Signed-off-by: Stefano Garzarella --- subprojects/libvhost-user/libvhost-user.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/subprojects/libvhost-user/libvhost-user.c b/subprojects/libvho= st-user/libvhost-user.c index a11afd1960..2c20cdc16e 100644 --- a/subprojects/libvhost-user/libvhost-user.c +++ b/subprojects/libvhost-user/libvhost-user.c @@ -1674,6 +1674,17 @@ vu_get_protocol_features_exec(VuDev *dev, VhostUserM= sg *vmsg) features |=3D dev->iface->get_protocol_features(dev); } =20 +#ifndef MFD_ALLOW_SEALING + /* + * If MFD_ALLOW_SEALING is not defined, we are not able to handle + * VHOST_USER_GET_INFLIGHT_FD messages, since we can't create a memfd. + * Those messages are used only if VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD + * is negotiated. A device implementation can enable it, so let's mask + * it to avoid a runtime panic. + */ + features &=3D ~(1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD); +#endif + vmsg_set_reply_u64(vmsg, features); return true; } --=20 2.45.2