From nobody Sun Nov 24 09:05:19 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass(p=none dis=none) header.from=suse.de ARC-Seal: i=1; a=rsa-sha256; t=1724702158; cv=none; d=zohomail.com; s=zohoarc; b=V0J1Eeg3xFfYtkj0UnuemAjCt1AImnLDDhW9AjGwZZ8dcdw8iGHNXQlD73uKwmOej96avug0wR/BUNxBu+iCANcnPmL41bLq9TBkNJdfANWU/Od2T+by5QNYRNpVjBYA8uMjYK4UltboQ7tQIzCGObjDNyb5aiTV4/cdv+E8s2w= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1724702158; h=Content-Type:Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:Subject:To:To:Message-Id:Reply-To; bh=N6Qz4GSqPbQs71uA2rNf8+Khxz2lDz4ZGpmmrlJWLQs=; b=X983BZSj6DQwTMU3xNPC7zlCxMJ+voZEVMp1s+dLG2NTD14QQCqn3Mbj9RvV6RhfB8uiZVS/t50YOhlBeGmV4gy9/fUSGdYhQIZj+2GW2xHBlRHJDQz+sXX7Ma+Fv3+brBjGqChOZfKjpItTBm/zGI0EXj68SDr/BT8ucbGIhGs= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=pass header.from= (p=none dis=none) Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1724702158139161.33119107614903; Mon, 26 Aug 2024 12:55:58 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sifmy-00006y-8P; Mon, 26 Aug 2024 15:54:08 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1sifmv-0008Lo-2U for qemu-devel@nongnu.org; Mon, 26 Aug 2024 15:54:05 -0400 Received: from smtp-out1.suse.de ([195.135.223.130]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1sifmr-0002Ff-Up for qemu-devel@nongnu.org; Mon, 26 Aug 2024 15:54:04 -0400 Received: from imap1.dmz-prg2.suse.org (unknown [10.150.64.97]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by smtp-out1.suse.de (Postfix) with ESMTPS id A589A21AE0; Mon, 26 Aug 2024 19:54:00 +0000 (UTC) Received: from imap1.dmz-prg2.suse.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by imap1.dmz-prg2.suse.org (Postfix) with ESMTPS id 427901398D; Mon, 26 Aug 2024 19:53:59 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id iPOfAlfdzGY5PQAAD6G6ig (envelope-from ); Mon, 26 Aug 2024 19:53:59 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1724702040; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=N6Qz4GSqPbQs71uA2rNf8+Khxz2lDz4ZGpmmrlJWLQs=; b=Szl81JdkVZMEdKcohTabdoPP47WX4979NCL6o3Eh2kYVeH3ls7PaEiqm1wNBnvoG1dBQIp kPM+j06bk6N8pS7tvKEYBpwXzjaBQhwTxvFnTsZijuAAsf6w/2rvUpAaO+TnDA6vw1JKwh fUcggoXsi+EQuX7At1zL3got/PUrECA= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1724702040; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=N6Qz4GSqPbQs71uA2rNf8+Khxz2lDz4ZGpmmrlJWLQs=; b=5ija/8WwnQJXgrfhTypi4zb5Ftm2+clSpivMCPRcQZWcPhNm+hRs1Gu4hL6WsHFceoeqBH 39KIkIrbPeHOKDAw== Authentication-Results: smtp-out1.suse.de; none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1724702040; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=N6Qz4GSqPbQs71uA2rNf8+Khxz2lDz4ZGpmmrlJWLQs=; b=Szl81JdkVZMEdKcohTabdoPP47WX4979NCL6o3Eh2kYVeH3ls7PaEiqm1wNBnvoG1dBQIp kPM+j06bk6N8pS7tvKEYBpwXzjaBQhwTxvFnTsZijuAAsf6w/2rvUpAaO+TnDA6vw1JKwh fUcggoXsi+EQuX7At1zL3got/PUrECA= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1724702040; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=N6Qz4GSqPbQs71uA2rNf8+Khxz2lDz4ZGpmmrlJWLQs=; b=5ija/8WwnQJXgrfhTypi4zb5Ftm2+clSpivMCPRcQZWcPhNm+hRs1Gu4hL6WsHFceoeqBH 39KIkIrbPeHOKDAw== From: Fabiano Rosas To: qemu-devel@nongnu.org Cc: Peter Xu , "Maciej S . Szmigiero" , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Subject: [PATCH v5 18/18] migration/multifd: Stop changing the packet on recv side Date: Mon, 26 Aug 2024 16:53:22 -0300 Message-Id: <20240826195322.16532-19-farosas@suse.de> X-Mailer: git-send-email 2.35.3 In-Reply-To: <20240826195322.16532-1-farosas@suse.de> References: <20240826195322.16532-1-farosas@suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Spamd-Result: default: False [-3.30 / 50.00]; BAYES_HAM(-3.00)[99.99%]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-0.998]; MIME_GOOD(-0.10)[text/plain]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FUZZY_BLOCKED(0.00)[rspamd.com]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; MIME_TRACE(0.00)[0:+]; ARC_NA(0.00)[]; FROM_HAS_DN(0.00)[]; RCVD_TLS_ALL(0.00)[]; RCPT_COUNT_THREE(0.00)[4]; FROM_EQ_ENVFROM(0.00)[]; TO_DN_SOME(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; RCVD_VIA_SMTP_AUTH(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:email, suse.de:mid, imap1.dmz-prg2.suse.org:helo] X-Spam-Score: -3.30 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=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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @suse.de) X-ZM-MESSAGEID: 1724702160169116600 As observed by Philippe, the multifd_ram_unfill_packet() function currently leaves the MultiFDPacket structure with mixed endianness. This is harmless, but ultimately not very clean. Aside from that, the packet is also written to on the recv side to ensure the ramblock name is null-terminated. Stop touching the received packet and do the necessary work using stack variables instead. While here tweak the error strings and fix the space before semicolons. Also remove the "100 times bigger" comment because it's just one possible explanation for a size mismatch and it doesn't even match the code. CC: Philippe Mathieu-Daud=C3=A9 Signed-off-by: Fabiano Rosas --- migration/multifd-nocomp.c | 38 ++++++++++++++++---------------------- migration/multifd.c | 18 ++++++++---------- 2 files changed, 24 insertions(+), 32 deletions(-) diff --git a/migration/multifd-nocomp.c b/migration/multifd-nocomp.c index f294d1b0b2..0cbf1b88e1 100644 --- a/migration/multifd-nocomp.c +++ b/migration/multifd-nocomp.c @@ -220,33 +220,29 @@ int multifd_ram_unfill_packet(MultiFDRecvParams *p, E= rror **errp) MultiFDPacket_t *packet =3D p->packet; uint32_t page_count =3D multifd_ram_page_count(); uint32_t page_size =3D multifd_ram_page_size(); + uint32_t pages_per_packet =3D be32_to_cpu(packet->pages_alloc); + const char *ramblock_name; int i; =20 - packet->pages_alloc =3D be32_to_cpu(packet->pages_alloc); - /* - * If we received a packet that is 100 times bigger than expected - * just stop migration. It is a magic number. - */ - if (packet->pages_alloc > page_count) { - error_setg(errp, "multifd: received packet " - "with size %u and expected a size of %u", - packet->pages_alloc, page_count) ; + if (pages_per_packet > page_count) { + error_setg(errp, "multifd: received packet with %u pages, expected= %u", + pages_per_packet, page_count); return -1; } =20 p->normal_num =3D be32_to_cpu(packet->normal_pages); - if (p->normal_num > packet->pages_alloc) { - error_setg(errp, "multifd: received packet " - "with %u normal pages and expected maximum pages are %u= ", - p->normal_num, packet->pages_alloc) ; + if (p->normal_num > pages_per_packet) { + error_setg(errp, "multifd: received packet with %u non-zero pages,= " + "which exceeds maximum expected pages %u", + p->normal_num, pages_per_packet); return -1; } =20 p->zero_num =3D be32_to_cpu(packet->zero_pages); - if (p->zero_num > packet->pages_alloc - p->normal_num) { - error_setg(errp, "multifd: received packet " - "with %u zero pages and expected maximum zero pages are= %u", - p->zero_num, packet->pages_alloc - p->normal_num) ; + if (p->zero_num > pages_per_packet - p->normal_num) { + error_setg(errp, + "multifd: received packet with %u zero pages, expected = maximum %u", + p->zero_num, pages_per_packet - p->normal_num); return -1; } =20 @@ -254,12 +250,10 @@ int multifd_ram_unfill_packet(MultiFDRecvParams *p, E= rror **errp) return 0; } =20 - /* make sure that ramblock is 0 terminated */ - packet->ramblock[255] =3D 0; - p->block =3D qemu_ram_block_by_name(packet->ramblock); + ramblock_name =3D g_strndup(packet->ramblock, 255); + p->block =3D qemu_ram_block_by_name(ramblock_name); if (!p->block) { - error_setg(errp, "multifd: unknown ram block %s", - packet->ramblock); + error_setg(errp, "multifd: unknown ram block %s", ramblock_name); return -1; } =20 diff --git a/migration/multifd.c b/migration/multifd.c index b89715fdc2..256ecdea56 100644 --- a/migration/multifd.c +++ b/migration/multifd.c @@ -231,21 +231,19 @@ void multifd_send_fill_packet(MultiFDSendParams *p) static int multifd_recv_unfill_packet(MultiFDRecvParams *p, Error **errp) { MultiFDPacket_t *packet =3D p->packet; + uint32_t magic =3D be32_to_cpu(packet->magic); + uint32_t version =3D be32_to_cpu(packet->version); int ret =3D 0; =20 - packet->magic =3D be32_to_cpu(packet->magic); - if (packet->magic !=3D MULTIFD_MAGIC) { - error_setg(errp, "multifd: received packet " - "magic %x and expected magic %x", - packet->magic, MULTIFD_MAGIC); + if (magic !=3D MULTIFD_MAGIC) { + error_setg(errp, "multifd: received packet magic %x, expected %x", + magic, MULTIFD_MAGIC); return -1; } =20 - packet->version =3D be32_to_cpu(packet->version); - if (packet->version !=3D MULTIFD_VERSION) { - error_setg(errp, "multifd: received packet " - "version %u and expected version %u", - packet->version, MULTIFD_VERSION); + if (version !=3D MULTIFD_VERSION) { + error_setg(errp, "multifd: received packet version %u, expected %u= ", + version, MULTIFD_VERSION); return -1; } =20 --=20 2.35.3