linux-hardening - [PATCH 09/10] scsi: aic94xx: Remove snprintf() from sysfs call-backs and replace with sysfs

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Date: Thu,  8 Feb 2024 08:44:21 +0000
From: Lee Jones <lee@...nel.org>
To: lee@...nel.org
Cc: linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org,
	"James E.J. Bottomley" <jejb@...ux.ibm.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	John Garry <john.g.garry@...cle.com>,
	Luben Tuikov <luben_tuikov@...ptec.com>,
	linux-scsi@...r.kernel.org
Subject: [PATCH 09/10] scsi: aic94xx: Remove snprintf() from sysfs call-backs and replace with sysfs_emit()

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 <lee@...nel.org>
---
Cc: "James E.J. Bottomley" <jejb@...ux.ibm.com>
Cc: "Martin K. Petersen" <martin.petersen@...cle.com>
Cc: John Garry <john.g.garry@...cle.com>
Cc: Luben Tuikov <luben_tuikov@...ptec.com>
Cc: linux-scsi@...r.kernel.org
---
 drivers/scsi/aic94xx/aic94xx_init.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/scsi/aic94xx/aic94xx_init.c b/drivers/scsi/aic94xx/aic94xx_init.c
index 8a3340d8d7ad4..c976e4b77c71e 100644
--- a/drivers/scsi/aic94xx/aic94xx_init.c
+++ b/drivers/scsi/aic94xx/aic94xx_init.c
@@ -264,8 +264,7 @@ static ssize_t asd_show_dev_rev(struct device *dev,
 				struct device_attribute *attr, char *buf)
 {
 	struct asd_ha_struct *asd_ha = dev_to_asd_ha(dev);
-	return snprintf(buf, PAGE_SIZE, "%s\n",
-			asd_dev_rev[asd_ha->revision_id]);
+	return sysfs_emit(buf, "%s\n", asd_dev_rev[asd_ha->revision_id]);
 }
 static DEVICE_ATTR(aic_revision, S_IRUGO, asd_show_dev_rev, NULL);
 
@@ -273,7 +272,7 @@ static ssize_t asd_show_dev_bios_build(struct device *dev,
 				       struct device_attribute *attr,char *buf)
 {
 	struct asd_ha_struct *asd_ha = dev_to_asd_ha(dev);
-	return snprintf(buf, PAGE_SIZE, "%d\n", asd_ha->hw_prof.bios.bld);
+	return sysfs_emit(buf, "%d\n", asd_ha->hw_prof.bios.bld);
 }
 static DEVICE_ATTR(bios_build, S_IRUGO, asd_show_dev_bios_build, NULL);
 
@@ -281,7 +280,7 @@ static ssize_t asd_show_dev_pcba_sn(struct device *dev,
 				    struct device_attribute *attr, char *buf)
 {
 	struct asd_ha_struct *asd_ha = dev_to_asd_ha(dev);
-	return snprintf(buf, PAGE_SIZE, "%s\n", asd_ha->hw_prof.pcba_sn);
+	return sysfs_emit(buf, "%s\n", asd_ha->hw_prof.pcba_sn);
 }
 static DEVICE_ATTR(pcba_sn, S_IRUGO, asd_show_dev_pcba_sn, NULL);
 
@@ -452,7 +451,7 @@ static ssize_t asd_show_update_bios(struct device *dev,
 	if (asd_ha->bios_status != FLASH_IN_PROGRESS)
 		asd_ha->bios_status = FLASH_OK;
 
-	return snprintf(buf, PAGE_SIZE, "status=%x %s\n",
+	return sysfs_emit(buf, "status=%x %s\n",
 			flash_error_table[i].err_code,
 			flash_error_table[i].reason);
 }
@@ -937,7 +936,7 @@ static int asd_scan_finished(struct Scsi_Host *shost, unsigned long time)
 
 static ssize_t version_show(struct device_driver *driver, char *buf)
 {
-	return snprintf(buf, PAGE_SIZE, "%s\n", ASD_DRIVER_VERSION);
+	return sysfs_emit(buf, "%s\n", ASD_DRIVER_VERSION);
 }
 static DRIVER_ATTR_RO(version);
 
-- 
2.43.0.594.gd9cf4e227d-goog