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Fri, 15 Mar 2024 03:20:44 +0000 (UTC) Received: from dovecot-director2.suse.de ([10.150.64.162]) by imap1.dmz-prg2.suse.org with ESMTPSA id eMaYLYy+82XZcQAAD6G6ig (envelope-from ); Fri, 15 Mar 2024 03:20:44 +0000 From: Fabiano Rosas To: qemu-devel@nongnu.org Cc: =?utf-8?q?Daniel_P_=2E_Berrang=C3=A9?= , Peter Xu Subject: [PATCH v3 1/3] migration/multifd: Ensure we're not given a socket for file migration Date: Fri, 15 Mar 2024 00:20:38 -0300 Message-Id: <20240315032040.7974-2-farosas@suse.de> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20240315032040.7974-1-farosas@suse.de> References: <20240315032040.7974-1-farosas@suse.de> MIME-Version: 1.0 Authentication-Results: smtp-out1.suse.de; none X-Spam-Score: 0.70 X-Spamd-Result: default: False [0.70 / 50.00]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[3]; R_MISSING_CHARSET(2.50)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; MIME_GOOD(-0.10)[text/plain]; BROKEN_CONTENT_TYPE(1.50)[]; TO_DN_SOME(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; RCVD_COUNT_THREE(0.00)[3]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; NEURAL_HAM_SHORT(-0.20)[-0.987]; MID_CONTAINS_FROM(1.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:email]; FUZZY_BLOCKED(0.00)[rspamd.com]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; RCVD_TLS_ALL(0.00)[]; BAYES_HAM(-3.00)[100.00%] Received-SPF: pass client-ip=195.135.223.130; envelope-from=farosas@suse.de; helo=smtp-out1.suse.de X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham 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+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org 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 --- 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, Error **errp) } 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 **errp) int fd = fd_args_get_fd(); if (fd && fd != -1) { + if (fd_is_socket(fd)) { + error_setg(errp, + "Multifd migration to a socket FD is not supported"); + goto out; + } + ioc = qio_channel_file_new_dupfd(fd, errp); } else { ioc = qio_channel_file_new_path(outgoing_args.fname, flags, 0, errp); 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) } /* - * 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 == MIGRATION_ADDRESS_TYPE_SOCKET) { return addr->u.socket.type == SOCKET_ADDRESS_TYPE_FD;