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author | Horst Hummel <horst.hummel@de.ibm.com> | 2006-12-04 15:39:50 +0100 |
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committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2006-12-04 15:39:50 +0100 |
commit | 01376f4495840f3daf6d73679242b5964fc9603b (patch) | |
tree | 51ef99991b42d6c623e5f1be980ff04026cc3ebb /drivers/s390 | |
parent | 26916264c17b5af8a3eaaf83b128f85cf1107cff (diff) | |
download | kernel_samsung_smdk4412-01376f4495840f3daf6d73679242b5964fc9603b.zip kernel_samsung_smdk4412-01376f4495840f3daf6d73679242b5964fc9603b.tar.gz kernel_samsung_smdk4412-01376f4495840f3daf6d73679242b5964fc9603b.tar.bz2 |
[S390] handle incorrect values when writing to dasd sysfs attributes.
When writing to dasd attributes (e.g. readonly), all values besides '1'
are handled like '0'.
Other sysfs-attributes like 'online' are checking for '1' and for '0'
and do not accept other values. Therefore enhanced checking and error
handling in dasd_devmap attribute store functions.
Signed-off-by: Horst Hummel <horst.hummel@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390')
-rw-r--r-- | drivers/s390/block/dasd_devmap.c | 43 |
1 files changed, 29 insertions, 14 deletions
diff --git a/drivers/s390/block/dasd_devmap.c b/drivers/s390/block/dasd_devmap.c index 91cf971..b5e70c5 100644 --- a/drivers/s390/block/dasd_devmap.c +++ b/drivers/s390/block/dasd_devmap.c @@ -684,21 +684,26 @@ dasd_ro_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct dasd_devmap *devmap; - int ro_flag; + int val; + char *endp; devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); if (IS_ERR(devmap)) return PTR_ERR(devmap); - ro_flag = buf[0] == '1'; + + val = simple_strtoul(buf, &endp, 0); + if (((endp + 1) < (buf + count)) || (val > 1)) + return -EINVAL; + spin_lock(&dasd_devmap_lock); - if (ro_flag) + if (val) devmap->features |= DASD_FEATURE_READONLY; else devmap->features &= ~DASD_FEATURE_READONLY; if (devmap->device) devmap->device->features = devmap->features; if (devmap->device && devmap->device->gdp) - set_disk_ro(devmap->device->gdp, ro_flag); + set_disk_ro(devmap->device->gdp, val); spin_unlock(&dasd_devmap_lock); return count; } @@ -729,17 +734,22 @@ dasd_use_diag_store(struct device *dev, struct device_attribute *attr, { struct dasd_devmap *devmap; ssize_t rc; - int use_diag; + int val; + char *endp; devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); if (IS_ERR(devmap)) return PTR_ERR(devmap); - use_diag = buf[0] == '1'; + + val = simple_strtoul(buf, &endp, 0); + if (((endp + 1) < (buf + count)) || (val > 1)) + return -EINVAL; + spin_lock(&dasd_devmap_lock); /* Changing diag discipline flag is only allowed in offline state. */ rc = count; if (!devmap->device) { - if (use_diag) + if (val) devmap->features |= DASD_FEATURE_USEDIAG; else devmap->features &= ~DASD_FEATURE_USEDIAG; @@ -854,20 +864,25 @@ dasd_eer_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct dasd_devmap *devmap; - int rc; + int val, rc; + char *endp; devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); if (IS_ERR(devmap)) return PTR_ERR(devmap); if (!devmap->device) - return count; - if (buf[0] == '1') { + return -ENODEV; + + val = simple_strtoul(buf, &endp, 0); + if (((endp + 1) < (buf + count)) || (val > 1)) + return -EINVAL; + + rc = count; + if (val) rc = dasd_eer_enable(devmap->device); - if (rc) - return rc; - } else + else dasd_eer_disable(devmap->device); - return count; + return rc; } static DEVICE_ATTR(eer_enabled, 0644, dasd_eer_show, dasd_eer_store); |