From patchwork Thu Feb 8 08:44:16 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lee Jones X-Patchwork-Id: 13549440 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 061A76F50E; Thu, 8 Feb 2024 08:45:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707381929; cv=none; b=PuxU7Pxv8ALkJrMwC54G/g7fmS8kZSFVl/gmehvS2cPweZNg4BHkWC7nRgtuw7/xCWA9pXR9nCeiCVn29ZnycXpWdcwF9uR1B1NLLrOVEWz1Ave+kGxlO+DIkIizH9SQYYmk/Sh1yQ+rYBYSYH7INXwBFGaUuXZEnj6Beg9xMcQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707381929; c=relaxed/simple; bh=Z2CP+O5Bv9LbkXXAh5F8xDT7ZCfBYn4Mn2nqmn37ldw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=qYDKVCT2vptlHlrH7QLbHOwo6FAmqL9d9/BxBKk+35znhSBiNNRl2NIEFDOC2sZDM0LKk72Oeqf47l/bSBBGqqD458/YszqNlXm8lH4jFFv9zMoyRv/G9c3RvwiD2ecf+L8QIx26pd3BwpaMFzyWn6JeTleHjh27OS0H93R4UZI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=MNxilidQ; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="MNxilidQ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 721C2C43394; Thu, 8 Feb 2024 08:45:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1707381928; bh=Z2CP+O5Bv9LbkXXAh5F8xDT7ZCfBYn4Mn2nqmn37ldw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=MNxilidQzOvdSPg22Q6azfmgMcS4E2C/rBzHDGxIpkSY0f83QhtuhCxMwfxhldgwD LLbe9tmty92PjuqBCqdNdX07LGA02ZVepLkQPlqK4Pfzcr65X1l/8FBnE2oNX+TwhX /N85C1wBdDetTek4BewQukeCTSDFf17sBn9sZBWRiYR5Z+gRMj5Hj3MrA1TOD42KQ7 UUPKr5jWJqoEIbhv7mP45UDHfVqoJYLDp0sXWqYoYuIpBghDBjSgDSC4V3w9skguj7 RzgIZMAGtlAcIXi69/qOqKosBgbeQwHSbLBRT2IpItV/g9NnoEItd1iny1Cfk6lgmP jmNIqcBhhhSdg== From: Lee Jones To: lee@kernel.org Cc: linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org, Adaptec OEM Raid Solutions , "James E.J. Bottomley" , "Martin K. Petersen" , "PMC-Sierra, Inc" , linux-scsi@vger.kernel.org Subject: [PATCH 04/10] scsi: aacraid: linit: Remove snprintf() from sysfs call-backs and replace with sysfs_emit() Date: Thu, 8 Feb 2024 08:44:16 +0000 Message-ID: <20240208084512.3803250-5-lee@kernel.org> X-Mailer: git-send-email 2.43.0.594.gd9cf4e227d-goog In-Reply-To: <20240208084512.3803250-1-lee@kernel.org> References: <20240208084512.3803250-1-lee@kernel.org> Precedence: bulk X-Mailing-List: linux-hardening@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Since snprintf() has the documented, but still rather strange trait of returning the length of the data that *would have been* written to the array if space were available, rather than the arguably more useful length of data *actually* written, it is usually considered wise to use something else instead in order to avoid confusion. In the case of sysfs call-backs, new wrappers exist that do just that. Link: https://lwn.net/Articles/69419/ Link: https://github.com/KSPP/linux/issues/105 Signed-off-by: Lee Jones Reviewed-by: Kees Cook --- Cc: Adaptec OEM Raid Solutions Cc: "James E.J. Bottomley" Cc: "Martin K. Petersen" Cc: "PMC-Sierra, Inc" Cc: linux-scsi@vger.kernel.org --- drivers/scsi/aacraid/linit.c | 34 ++++++++++++++-------------------- 1 file changed, 14 insertions(+), 20 deletions(-) diff --git a/drivers/scsi/aacraid/linit.c b/drivers/scsi/aacraid/linit.c index 68f4dbcfff492..69526e2bd2e78 100644 --- a/drivers/scsi/aacraid/linit.c +++ b/drivers/scsi/aacraid/linit.c @@ -558,11 +558,9 @@ static ssize_t aac_show_raid_level(struct device *dev, struct device_attribute * struct scsi_device *sdev = to_scsi_device(dev); struct aac_dev *aac = (struct aac_dev *)(sdev->host->hostdata); if (sdev_channel(sdev) != CONTAINER_CHANNEL) - return snprintf(buf, PAGE_SIZE, sdev->no_uld_attach - ? "Hidden\n" : + return sysfs_emit(buf, sdev->no_uld_attach ? "Hidden\n" : ((aac->jbod && (sdev->type == TYPE_DISK)) ? "JBOD\n" : "")); - return snprintf(buf, PAGE_SIZE, "%s\n", - get_container_type(aac->fsa_dev[sdev_id(sdev)].type)); + return sysfs_emit(buf, "%s\n", get_container_type(aac->fsa_dev[sdev_id(sdev)].type)); } static struct device_attribute aac_raid_level_attr = { @@ -1195,10 +1193,9 @@ static ssize_t aac_show_model(struct device *device, ++cp; while (*cp == ' ') ++cp; - len = snprintf(buf, PAGE_SIZE, "%s\n", cp); + len = sysfs_emit(buf, "%s\n", cp); } else - len = snprintf(buf, PAGE_SIZE, "%s\n", - aac_drivers[dev->cardtype].model); + len = sysfs_emit(buf, "%s\n", aac_drivers[dev->cardtype].model); return len; } @@ -1214,12 +1211,11 @@ static ssize_t aac_show_vendor(struct device *device, char *cp = sup_adap_info->adapter_type_text; while (*cp && *cp != ' ') ++cp; - len = snprintf(buf, PAGE_SIZE, "%.*s\n", + len = sysfs_emit(buf, "%.*s\n", (int)(cp - (char *)sup_adap_info->adapter_type_text), sup_adap_info->adapter_type_text); } else - len = snprintf(buf, PAGE_SIZE, "%s\n", - aac_drivers[dev->cardtype].vname); + len = sysfs_emit(buf, "%s\n", aac_drivers[dev->cardtype].vname); return len; } @@ -1230,7 +1226,7 @@ static ssize_t aac_show_flags(struct device *cdev, struct aac_dev *dev = (struct aac_dev*)class_to_shost(cdev)->hostdata; if (nblank(dprintk(x))) - len = snprintf(buf, PAGE_SIZE, "dprintk\n"); + len = sysfs_emit(buf, "dprintk\n"); #ifdef AAC_DETAILED_STATUS_INFO len += scnprintf(buf + len, PAGE_SIZE - len, "AAC_DETAILED_STATUS_INFO\n"); @@ -1258,7 +1254,7 @@ static ssize_t aac_show_kernel_version(struct device *device, int len, tmp; tmp = le32_to_cpu(dev->adapter_info.kernelrev); - len = snprintf(buf, PAGE_SIZE, "%d.%d-%d[%d]\n", + len = sysfs_emit(buf, "%d.%d-%d[%d]\n", tmp >> 24, (tmp >> 16) & 0xff, tmp & 0xff, le32_to_cpu(dev->adapter_info.kernelbuild)); return len; @@ -1272,7 +1268,7 @@ static ssize_t aac_show_monitor_version(struct device *device, int len, tmp; tmp = le32_to_cpu(dev->adapter_info.monitorrev); - len = snprintf(buf, PAGE_SIZE, "%d.%d-%d[%d]\n", + len = sysfs_emit(buf, "%d.%d-%d[%d]\n", tmp >> 24, (tmp >> 16) & 0xff, tmp & 0xff, le32_to_cpu(dev->adapter_info.monitorbuild)); return len; @@ -1286,7 +1282,7 @@ static ssize_t aac_show_bios_version(struct device *device, int len, tmp; tmp = le32_to_cpu(dev->adapter_info.biosrev); - len = snprintf(buf, PAGE_SIZE, "%d.%d-%d[%d]\n", + len = sysfs_emit(buf, "%d.%d-%d[%d]\n", tmp >> 24, (tmp >> 16) & 0xff, tmp & 0xff, le32_to_cpu(dev->adapter_info.biosbuild)); return len; @@ -1296,7 +1292,7 @@ static ssize_t aac_show_driver_version(struct device *device, struct device_attribute *attr, char *buf) { - return snprintf(buf, PAGE_SIZE, "%s\n", aac_driver_version); + return sysfs_emit(buf, "%s\n", aac_driver_version); } static ssize_t aac_show_serial_number(struct device *device, @@ -1322,15 +1318,13 @@ static ssize_t aac_show_serial_number(struct device *device, static ssize_t aac_show_max_channel(struct device *device, struct device_attribute *attr, char *buf) { - return snprintf(buf, PAGE_SIZE, "%d\n", - class_to_shost(device)->max_channel); + return sysfs_emit(buf, "%d\n", class_to_shost(device)->max_channel); } static ssize_t aac_show_max_id(struct device *device, struct device_attribute *attr, char *buf) { - return snprintf(buf, PAGE_SIZE, "%d\n", - class_to_shost(device)->max_id); + return sysfs_emit(buf, "%d\n", class_to_shost(device)->max_id); } static ssize_t aac_store_reset_adapter(struct device *device, @@ -1360,7 +1354,7 @@ static ssize_t aac_show_reset_adapter(struct device *device, tmp = aac_adapter_check_health(dev); if ((tmp == 0) && dev->in_reset) tmp = -EBUSY; - len = snprintf(buf, PAGE_SIZE, "0x%x\n", tmp); + len = sysfs_emit(buf, "0x%x\n", tmp); return len; }