From patchwork Mon Oct 30 21:43:20 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Justin Stitt X-Patchwork-Id: 13440907 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 03FD0C4167D for ; Mon, 30 Oct 2023 21:43:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232031AbjJ3Vne (ORCPT ); Mon, 30 Oct 2023 17:43:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58182 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232022AbjJ3Vnc (ORCPT ); Mon, 30 Oct 2023 17:43:32 -0400 Received: from mail-yb1-xb4a.google.com (mail-yb1-xb4a.google.com [IPv6:2607:f8b0:4864:20::b4a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 64469FC for ; Mon, 30 Oct 2023 14:43:29 -0700 (PDT) Received: by mail-yb1-xb4a.google.com with SMTP id 3f1490d57ef6-da03c5ae220so5459306276.1 for ; Mon, 30 Oct 2023 14:43:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1698702208; x=1699307008; darn=vger.kernel.org; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=e0/kVkiQLU+xIRwt52fqnoXoD0xR1x3vYThaNEUFKi4=; b=fUFX6S1FHiL4JEaW/hEsZKmn6RQRRxqm29qviKpUAA9k7GTUgJ1a0/v2rwnhqKaOph wfTsjdrhFNK5yTofrEIyb8YInqbIHYWCc11ykvkIi9dgvmATf4xiqdsruBoSTF0E1UIv Guxmt97LV/78/CdsuRxH3B9Jn2T2umjDV7ildiux+tzlWSXdNqHGs3goMHLEValVZsrU eVk1syHgeEIm4tTRCuQH8x7yOx3dlPanhd6cYya182BSZd1ixaVbXtfAdvzc7gvAiFtb uLHXvloSKqP3B95fOW2Du8vCTgtVTdWRnPqI1QH8o3DibQz93biK3WooGjwS80R8DtHI nzOA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1698702208; x=1699307008; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=e0/kVkiQLU+xIRwt52fqnoXoD0xR1x3vYThaNEUFKi4=; b=npY/WLjbrooHjMbCCNL+2W3OroSVMbVDxssZYG15pkfulrd5U16MoZlLabRuT73QW+ qoh6/lAa5D+FCW/9fPoeDPnDTithnFGMvC6nf7hvis/2hl2YTx7zKGVNcCyMIpsw72Ou QDS+xVXFd7MbgDXWtyqtGhFIa4QySzA4NX25iQQMqzoOsgdYdXjhu7Y236/duYDXD8xM gBLeu0EJjRttLq0RnXGHsZv1VxnJKYwmV4kOpUMKKyshs/dclzKZvZ3dqbFA0Ld8RrPP 0M1Tdqx4QubbzclLDqrKd1Qv9SLNEf5xtwUW0EmPiShVfnGLXUzI3l9FrIwG5eqU25u8 Bp6w== X-Gm-Message-State: AOJu0YzD3l+Q8Xusgd6Q7XF6lLM7QAChTgzcjXJxyio7wh3Xp1IykT+E XHSKOKtSP9toifMKr/JcUe1UJ1raIiW8hVguRg== X-Google-Smtp-Source: AGHT+IEXUXlPzoW8LU7PFVYlU3cL9csxmvgRBQ/QbNnZhZiLmayN6jB8H6VklsO7nx8Pl+1pBBHGDfMzZVfBBEi4PQ== X-Received: from jstitt-linux1.c.googlers.com ([fda3:e722:ac3:cc00:2b:ff92:c0a8:23b5]) (user=justinstitt job=sendgmr) by 2002:a25:a526:0:b0:da0:c924:4fdc with SMTP id h35-20020a25a526000000b00da0c9244fdcmr19773ybi.6.1698702208605; Mon, 30 Oct 2023 14:43:28 -0700 (PDT) Date: Mon, 30 Oct 2023 21:43:20 +0000 Mime-Version: 1.0 X-B4-Tracking: v=1; b=H4sIAHcjQGUC/1XNQQ6CMBCF4auQWTNJAW2EqxBiSjviLChkpmk0h Ltb3bl73+b9BygJk8JQHSCUWXmLBU1dgX+6uBByKIbWtF1jOoOaJPr9jUE4kyiqV0ae1/wd97S kf3i8uX4Ohq4Xay2U213owa9fcpzO8wNyWWNnggAAAA== X-Developer-Key: i=justinstitt@google.com; a=ed25519; pk=tC3hNkJQTpNX/gLKxTNQKDmiQl6QjBNCGKJINqAdJsE= X-Developer-Signature: v=1; a=ed25519-sha256; t=1698702207; l=3953; i=justinstitt@google.com; s=20230717; h=from:subject:message-id; bh=kOlkCIhi5msaDl4tWCdp680vEgZukUJWPpGc5Vel+XE=; b=Vh/XP+Dr4/JhN7ikIfweMhlTgzvJG5U7crnDcmM2QYApm4PKVv1/jXqzKmK5mqk409uzLD1Wg qe8yhsqwFwAAyBXiU35NozThSakmhUB28vdSQY/kuqTvIo/g0b8V3UV X-Mailer: b4 0.12.3 Message-ID: <20231030-strncpy-drivers-scsi-ibmvscsi_tgt-ibmvscsi_tgt-c-v1-1-859b5ce257fd@google.com> Subject: [PATCH] scsi: ibmvscsi_tgt: replace deprecated strncpy with strscpy From: Justin Stitt To: Michael Cyr , "James E.J. Bottomley" , "Martin K. Petersen" Cc: linux-scsi@vger.kernel.org, target-devel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org, Justin Stitt Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org strncpy() is deprecated for use on NUL-terminated destination strings [1] and as such we should prefer more robust and less ambiguous string interfaces. We don't need the NUL-padding behavior that strncpy() provides as vscsi is NUL-allocated in ibmvscsis_probe() which proceeds to call ibmvscsis_adapter_info(): | vscsi = kzalloc(sizeof(*vscsi), GFP_KERNEL); ibmvscsis_probe() -> ibmvscsis_handle_crq() -> ibmvscsis_parse_command() -> ibmvscsis_mad() -> ibmvscsis_process_mad() -> ibmvscsis_adapter_info() Following the same idea, `partition_name` is defiend as: | static char partition_name[PARTITION_NAMELEN] = "UNKNOWN"; ... which is NUL-padded already, meaning strscpy() is the best option. Considering the above, a suitable replacement is `strscpy` [2] due to the fact that it guarantees NUL-termination on the destination buffer without unnecessarily NUL-padding. However, for cap->name let's use strscpy_pad as cap is allocated via dma_alloc_coherent(): | cap = dma_alloc_coherent(&vscsi->dma_dev->dev, olen, &token, | GFP_ATOMIC); Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1] Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html [2] Link: https://github.com/KSPP/linux/issues/90 Cc: linux-hardening@vger.kernel.org Signed-off-by: Justin Stitt --- Note: build-tested only. Found with: $ rg "strncpy\(" --- drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) --- base-commit: ffc253263a1375a65fa6c9f62a893e9767fbebfa change-id: 20231030-strncpy-drivers-scsi-ibmvscsi_tgt-ibmvscsi_tgt-c-8a9bd0e54666 Best regards, -- Justin Stitt diff --git a/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c b/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c index 385f812b8793..cd223ef696e5 100644 --- a/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c +++ b/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c @@ -1551,17 +1551,17 @@ static long ibmvscsis_adapter_info(struct scsi_info *vscsi, if (vscsi->client_data.partition_number == 0) vscsi->client_data.partition_number = be32_to_cpu(info->partition_number); - strncpy(vscsi->client_data.srp_version, info->srp_version, + strscpy(vscsi->client_data.srp_version, info->srp_version, sizeof(vscsi->client_data.srp_version)); - strncpy(vscsi->client_data.partition_name, info->partition_name, + strscpy(vscsi->client_data.partition_name, info->partition_name, sizeof(vscsi->client_data.partition_name)); vscsi->client_data.mad_version = be32_to_cpu(info->mad_version); vscsi->client_data.os_type = be32_to_cpu(info->os_type); /* Copy our info */ - strncpy(info->srp_version, SRP_VERSION, + strscpy(info->srp_version, SRP_VERSION, sizeof(info->srp_version)); - strncpy(info->partition_name, vscsi->dds.partition_name, + strscpy(info->partition_name, vscsi->dds.partition_name, sizeof(info->partition_name)); info->partition_number = cpu_to_be32(vscsi->dds.partition_num); info->mad_version = cpu_to_be32(MAD_VERSION_1); @@ -1645,8 +1645,8 @@ static int ibmvscsis_cap_mad(struct scsi_info *vscsi, struct iu_entry *iue) be64_to_cpu(mad->buffer), vscsi->dds.window[LOCAL].liobn, token); if (rc == H_SUCCESS) { - strncpy(cap->name, dev_name(&vscsi->dma_dev->dev), - SRP_MAX_LOC_LEN); + strscpy_pad(cap->name, dev_name(&vscsi->dma_dev->dev), + sizeof(cap->name)); len = olen - min_len; status = VIOSRP_MAD_SUCCESS; @@ -3650,7 +3650,7 @@ static int ibmvscsis_get_system_info(void) name = of_get_property(rootdn, "ibm,partition-name", NULL); if (name) - strncpy(partition_name, name, sizeof(partition_name)); + strscpy(partition_name, name, sizeof(partition_name)); num = of_get_property(rootdn, "ibm,partition-no", NULL); if (num)