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([99.254.121.117]) by smtp.gmail.com with ESMTPSA id ed8-20020ad44ea8000000b00691879d7a50sm2391566qvb.115.2024.03.17.13.58.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 17 Mar 2024 13:58:18 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1710709101; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=nz8vhY0nyugAeRv9MWQlmYdsswd/VLGriTQno8XhX7U=; b=UKENncML9wKXjtQFF3dsDWULEhd9iVIqPcwa0c/KbR0su+QOIVsrX8pPrNLZWuSl8WbHGA uB9+Bd/FZ/3+ERxaTx6mW5p92O5+J0WOvrgVFKp0bKW5C6EduYV5QiYpMpbFhLJtY6aZ3K 8CiAS17sQifsTgj4Sn/xKJHW7aFSsHw= X-MC-Unique: xHFKda0IOzijUt9iLfLtWw-1 X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1710709099; x=1711313899; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=nz8vhY0nyugAeRv9MWQlmYdsswd/VLGriTQno8XhX7U=; b=b0zA0wHKA7MOvytQCLUhQNv0XWezgdHCpzY9AeQMPAn+HpjON6VDaZ81q7N/YzzSRB zDISVoFOQQEoBcccEkU3SqP462jiY3iTlkV4rP/rKhM5kETWJTbyvszrDHefM/2nXxqF XAeieXnUwTJa8eDo7y+o/uV+SSecumoOl3A/DuilYHoihewm1eBuIdm0O6n0d2QBsaaD /yeHufdmtkmz1M2LiwcocbYjrRJ9HlvHeJniy915oUgCsr7oJnpnHjf6n6MXskSVcQA8 j/txdkhuqmBxgvAIDsqQ9BzdFrqAUvevgNbHreigcj2MN96FsDSl0iemjSqxLGwjp6T5 KIZQ== X-Gm-Message-State: AOJu0YwlTgwC9dTe8KSkcSwgRdPJl6WWV5iTRxtVBSKfwUh/PBtAtsci WjSaHyXZ7HHnOyXuvEiri/cz8k6BCUFxcqt/zK6YcQuQwYdub3M/lV8ryJUAm/mLl1wto5eFqJ6 JefL+OuucDClyJXLf93vVGvpHKOO5wsTekAGlt/DtH1huAxppGbGPy2wLXIIMIi4ptA0NGEjNYz xkV26G5f5xZU4QY1A13n4vIfg5NGst7GZxmg== X-Received: by 2002:ad4:41cc:0:b0:691:87dd:f836 with SMTP id a12-20020ad441cc000000b0069187ddf836mr6382254qvq.5.1710709099164; Sun, 17 Mar 2024 13:58:19 -0700 (PDT) X-Google-Smtp-Source: AGHT+IE0hAPoh8PVF19JyzM3bDv5NCa9eyF5V5INCZ/GqxFjfehjwVscBnYO8Eozt1fUPIOGGXpCsw== X-Received: by 2002:ad4:41cc:0:b0:691:87dd:f836 with SMTP id a12-20020ad441cc000000b0069187ddf836mr6382223qvq.5.1710709098636; Sun, 17 Mar 2024 13:58:18 -0700 (PDT) From: peterx@redhat.com To: qemu-devel@nongnu.org, Peter Maydell Cc: Fabiano Rosas , Prasad Pandit , peterx@redhat.com, David Hildenbrand , Paolo Bonzini Subject: [PULL 09/10] migration/multifd: Ensure we're not given a socket for file migration Date: Sun, 17 Mar 2024 16:58:02 -0400 Message-ID: <20240317205803.361163-10-peterx@redhat.com> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240317205803.361163-1-peterx@redhat.com> References: <20240317205803.361163-1-peterx@redhat.com> MIME-Version: 1.0 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=peterx@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -8 X-Spam_score: -0.9 X-Spam_bar: / X-Spam_report: (-0.9 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.316, 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=-0.01, RCVD_IN_MSPIKE_WL=-0.01, RCVD_IN_SORBS_WEB=1.5, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=no 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: 1710709200391100001 Content-Type: text/plain; charset="utf-8" From: Fabiano Rosas When doing migration using the fd: URI, QEMU will fetch the file descriptor passed in via the monitor at fd_start_outgoing|incoming_migration(), which means the checks at migration_channels_and_transport_compatible() happen too soon and we don't know at that point whether the FD refers to a plain file or a socket. For this reason, we've been allowing a migration channel of type SOCKET_ADDRESS_TYPE_FD to pass the initial verifications in scenarios where the socket migration is not supported, such as with fd + multifd. The commit decdc76772 ("migration/multifd: Add mapped-ram support to fd: URI") was supposed to add a second check prior to starting migration to make sure a socket fd is not passed instead of a file fd, but failed to do so. Add the missing verification and update the comment explaining this situation which is currently incorrect. Fixes: decdc76772 ("migration/multifd: Add mapped-ram support to fd: URI") Signed-off-by: Fabiano Rosas Reviewed-by: Peter Xu Link: https://lore.kernel.org/r/20240315032040.7974-2-farosas@suse.de Signed-off-by: Peter Xu --- migration/fd.c | 8 ++++++++ migration/file.c | 7 +++++++ migration/migration.c | 6 +++--- 3 files changed, 18 insertions(+), 3 deletions(-) diff --git a/migration/fd.c b/migration/fd.c index 39a52e5c90..c07030f715 100644 --- a/migration/fd.c +++ b/migration/fd.c @@ -22,6 +22,7 @@ #include "migration.h" #include "monitor/monitor.h" #include "io/channel-file.h" +#include "io/channel-socket.h" #include "io/channel-util.h" #include "options.h" #include "trace.h" @@ -95,6 +96,13 @@ void fd_start_incoming_migration(const char *fdname, Err= or **errp) } =20 if (migrate_multifd()) { + if (fd_is_socket(fd)) { + error_setg(errp, + "Multifd migration to a socket FD is not supported"= ); + object_unref(ioc); + return; + } + file_create_incoming_channels(ioc, errp); } else { qio_channel_set_name(ioc, "migration-fd-incoming"); diff --git a/migration/file.c b/migration/file.c index ddde0ca818..b6e8ba13f2 100644 --- a/migration/file.c +++ b/migration/file.c @@ -15,6 +15,7 @@ #include "file.h" #include "migration.h" #include "io/channel-file.h" +#include "io/channel-socket.h" #include "io/channel-util.h" #include "options.h" #include "trace.h" @@ -58,6 +59,12 @@ bool file_send_channel_create(gpointer opaque, Error **e= rrp) int fd =3D fd_args_get_fd(); =20 if (fd && fd !=3D -1) { + if (fd_is_socket(fd)) { + error_setg(errp, + "Multifd migration to a socket FD is not supported"= ); + goto out; + } + ioc =3D qio_channel_file_new_dupfd(fd, errp); } else { ioc =3D qio_channel_file_new_path(outgoing_args.fname, flags, 0, e= rrp); diff --git a/migration/migration.c b/migration/migration.c index 644e073b7d..f60bd371e3 100644 --- a/migration/migration.c +++ b/migration/migration.c @@ -166,9 +166,9 @@ static bool transport_supports_seeking(MigrationAddress= *addr) } =20 /* - * At this point, the user might not yet have passed the file - * descriptor to QEMU, so we cannot know for sure whether it - * refers to a plain file or a socket. Let it through anyway. + * At this point QEMU has not yet fetched the fd passed in by the + * user, so we cannot know for sure whether it refers to a plain + * file or a socket. Let it through anyway and check at fd.c. */ if (addr->transport =3D=3D MIGRATION_ADDRESS_TYPE_SOCKET) { return addr->u.socket.type =3D=3D SOCKET_ADDRESS_TYPE_FD; --=20 2.44.0