From patchwork Sat Jul 22 15:26:37 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Konstantin Shelekhin X-Patchwork-Id: 13322972 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 35BFDEB64DC for ; Sat, 22 Jul 2023 15:27:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230082AbjGVP1Y (ORCPT ); Sat, 22 Jul 2023 11:27:24 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46332 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229881AbjGVP1X (ORCPT ); Sat, 22 Jul 2023 11:27:23 -0400 Received: from mta-04.yadro.com (mta-04.yadro.com [89.207.88.248]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B9DBD2715; Sat, 22 Jul 2023 08:27:21 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 mta-04.yadro.com 02B57C0003 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yadro.com; s=mta-04; t=1690039640; bh=+ULBQ2jumOvl9MkTs5AMHFnH5HiSB89dUHToVqz0vjU=; h=From:To:Subject:Date:Message-ID:MIME-Version:Content-Type:From; b=zb+sBS/QxtvhvGyzRRFS4alchLKG0yc8OWBJVKIc8JGgFWM6x9t6U1oJ7iywbYwbj ga6xQ8eVw8miqtImxYuVk4xF0m6dUiNQiBw3vad/ZNBR3elmwegE36TXDnkuRF5nk3 INmOHFEdX1dLJjmcdmM86P58N7DLKQEZ+ykcs5IL5h8alcLbVWNBfQLycYmWsF8ctJ GWzbQxoTIeHb3KplSsHvqMuMik4180Otz+xCtD0UvPBRs83o5IiDLdOqgJO2evpMxS HF3NSLSWgZqyYQP2TFr8TChsU40BqROW6URqgTawg3qF5nSuD9eq1OH7qVlYu36B6R k6leaeCYlfUsw== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yadro.com; s=mta-03; t=1690039640; bh=+ULBQ2jumOvl9MkTs5AMHFnH5HiSB89dUHToVqz0vjU=; h=From:To:Subject:Date:Message-ID:MIME-Version:Content-Type:From; b=eSSpgWtSjZ7qS7asF2Cxz8UyjnuFgtTGiQ+YPl2jsbAkThuvmU+5df+JEmECYMC5o k3stlhzAQtt8MqmoE3+BII4sEgZdMs9sIbxljyL4mv4dUgHLato458AzjlVEpRwZX8 PWJEVluUBD5PT6b0T+5GG7zF6/NhtiBc62s/bReJyXBRIR1fbEiX3UAHKzY3qQDKCk upyr6+rZJqCnMpTzM4rOOmiYepwXuZqQYh3Q7xeOOvamWfebFz3ewqyqEJCqMMjsjD ddz5EYJUBDhBwbPdKaQKGs6Eh2DUnTTEPrVVTznB/s3Mo6LnAbghJxA7PJx47xwftn n0FCihJVhW+Fg== From: Konstantin Shelekhin To: Martin Petersen CC: , , , Konstantin Shelekhin Subject: [PATCH 1/2] scsi: target: iscsi: Fix buffer overflow in lio_target_nacl_info_show Date: Sat, 22 Jul 2023 18:26:37 +0300 Message-ID: <20230722152657.168859-2-k.shelekhin@yadro.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230722152657.168859-1-k.shelekhin@yadro.com> References: <20230722152657.168859-1-k.shelekhin@yadro.com> MIME-Version: 1.0 X-ClientProxiedBy: T-EXCH-09.corp.yadro.com (172.17.11.59) To T-EXCH-09.corp.yadro.com (172.17.11.59) Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Function lio_target_nacl_info_show uses sprintf in a loop to print details for every iSCSI connection in a session without checking for the buffer length. With enough iSCSI connections it's possible to overflow the buffer provided by configfs and corrupt the memory. This patch replaces sprintf with sysfs_emit_at that checks for buffer boundries itself. Signed-off-by: Konstantin Shelekhin --- drivers/target/iscsi/iscsi_target_configfs.c | 54 ++++++++++---------- 1 file changed, 27 insertions(+), 27 deletions(-) diff --git a/drivers/target/iscsi/iscsi_target_configfs.c b/drivers/target/iscsi/iscsi_target_configfs.c index 5d0f51822414..c142a67dc7cc 100644 --- a/drivers/target/iscsi/iscsi_target_configfs.c +++ b/drivers/target/iscsi/iscsi_target_configfs.c @@ -533,102 +533,102 @@ static ssize_t lio_target_nacl_info_show(struct config_item *item, char *page) spin_lock_bh(&se_nacl->nacl_sess_lock); se_sess = se_nacl->nacl_sess; if (!se_sess) { - rb += sprintf(page+rb, "No active iSCSI Session for Initiator" + rb += sysfs_emit_at(page, rb, "No active iSCSI Session for Initiator" " Endpoint: %s\n", se_nacl->initiatorname); } else { sess = se_sess->fabric_sess_ptr; - rb += sprintf(page+rb, "InitiatorName: %s\n", + rb += sysfs_emit_at(page, rb, "InitiatorName: %s\n", sess->sess_ops->InitiatorName); - rb += sprintf(page+rb, "InitiatorAlias: %s\n", + rb += sysfs_emit_at(page, rb, "InitiatorAlias: %s\n", sess->sess_ops->InitiatorAlias); - rb += sprintf(page+rb, + rb += sysfs_emit_at(page, rb, "LIO Session ID: %u ISID: 0x%6ph TSIH: %hu ", sess->sid, sess->isid, sess->tsih); - rb += sprintf(page+rb, "SessionType: %s\n", + rb += sysfs_emit_at(page, rb, "SessionType: %s\n", (sess->sess_ops->SessionType) ? "Discovery" : "Normal"); - rb += sprintf(page+rb, "Session State: "); + rb += sysfs_emit_at(page, rb, "Session State: "); switch (sess->session_state) { case TARG_SESS_STATE_FREE: - rb += sprintf(page+rb, "TARG_SESS_FREE\n"); + rb += sysfs_emit_at(page, rb, "TARG_SESS_FREE\n"); break; case TARG_SESS_STATE_ACTIVE: - rb += sprintf(page+rb, "TARG_SESS_STATE_ACTIVE\n"); + rb += sysfs_emit_at(page, rb, "TARG_SESS_STATE_ACTIVE\n"); break; case TARG_SESS_STATE_LOGGED_IN: - rb += sprintf(page+rb, "TARG_SESS_STATE_LOGGED_IN\n"); + rb += sysfs_emit_at(page, rb, "TARG_SESS_STATE_LOGGED_IN\n"); break; case TARG_SESS_STATE_FAILED: - rb += sprintf(page+rb, "TARG_SESS_STATE_FAILED\n"); + rb += sysfs_emit_at(page, rb, "TARG_SESS_STATE_FAILED\n"); break; case TARG_SESS_STATE_IN_CONTINUE: - rb += sprintf(page+rb, "TARG_SESS_STATE_IN_CONTINUE\n"); + rb += sysfs_emit_at(page, rb, "TARG_SESS_STATE_IN_CONTINUE\n"); break; default: - rb += sprintf(page+rb, "ERROR: Unknown Session" + rb += sysfs_emit_at(page, rb, "ERROR: Unknown Session" " State!\n"); break; } - rb += sprintf(page+rb, "---------------------[iSCSI Session" + rb += sysfs_emit_at(page, rb, "---------------------[iSCSI Session" " Values]-----------------------\n"); - rb += sprintf(page+rb, " CmdSN/WR : CmdSN/WC : ExpCmdSN" + rb += sysfs_emit_at(page, rb, " CmdSN/WR : CmdSN/WC : ExpCmdSN" " : MaxCmdSN : ITT : TTT\n"); max_cmd_sn = (u32) atomic_read(&sess->max_cmd_sn); - rb += sprintf(page+rb, " 0x%08x 0x%08x 0x%08x 0x%08x" + rb += sysfs_emit_at(page, rb, " 0x%08x 0x%08x 0x%08x 0x%08x" " 0x%08x 0x%08x\n", sess->cmdsn_window, (max_cmd_sn - sess->exp_cmd_sn) + 1, sess->exp_cmd_sn, max_cmd_sn, sess->init_task_tag, sess->targ_xfer_tag); - rb += sprintf(page+rb, "----------------------[iSCSI" + rb += sysfs_emit_at(page, rb, "----------------------[iSCSI" " Connections]-------------------------\n"); spin_lock(&sess->conn_lock); list_for_each_entry(conn, &sess->sess_conn_list, conn_list) { - rb += sprintf(page+rb, "CID: %hu Connection" + rb += sysfs_emit_at(page, rb, "CID: %hu Connection" " State: ", conn->cid); switch (conn->conn_state) { case TARG_CONN_STATE_FREE: - rb += sprintf(page+rb, + rb += sysfs_emit_at(page, rb, "TARG_CONN_STATE_FREE\n"); break; case TARG_CONN_STATE_XPT_UP: - rb += sprintf(page+rb, + rb += sysfs_emit_at(page, rb, "TARG_CONN_STATE_XPT_UP\n"); break; case TARG_CONN_STATE_IN_LOGIN: - rb += sprintf(page+rb, + rb += sysfs_emit_at(page, rb, "TARG_CONN_STATE_IN_LOGIN\n"); break; case TARG_CONN_STATE_LOGGED_IN: - rb += sprintf(page+rb, + rb += sysfs_emit_at(page, rb, "TARG_CONN_STATE_LOGGED_IN\n"); break; case TARG_CONN_STATE_IN_LOGOUT: - rb += sprintf(page+rb, + rb += sysfs_emit_at(page, rb, "TARG_CONN_STATE_IN_LOGOUT\n"); break; case TARG_CONN_STATE_LOGOUT_REQUESTED: - rb += sprintf(page+rb, + rb += sysfs_emit_at(page, rb, "TARG_CONN_STATE_LOGOUT_REQUESTED\n"); break; case TARG_CONN_STATE_CLEANUP_WAIT: - rb += sprintf(page+rb, + rb += sysfs_emit_at(page, rb, "TARG_CONN_STATE_CLEANUP_WAIT\n"); break; default: - rb += sprintf(page+rb, + rb += sysfs_emit_at(page, rb, "ERROR: Unknown Connection State!\n"); break; } - rb += sprintf(page+rb, " Address %pISc %s", &conn->login_sockaddr, + rb += sysfs_emit_at(page, rb, " Address %pISc %s", &conn->login_sockaddr, (conn->network_transport == ISCSI_TCP) ? "TCP" : "SCTP"); - rb += sprintf(page+rb, " StatSN: 0x%08x\n", + rb += sysfs_emit_at(page, rb, " StatSN: 0x%08x\n", conn->stat_sn); } spin_unlock(&sess->conn_lock);