aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorDavid Brownell <david-b@pacbell.net>2007-11-14 16:58:30 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-11-14 18:45:36 -0800
commita4b1d50e6158ecaa8fdb6a716389149bace35b52 (patch)
tree90649fc6d9bcf2aa2684fde7d982d0f752f1e9f4
parent779d20892f8e716677194dc879eea2b5f1e75678 (diff)
downloadvexpress-lsk-a4b1d50e6158ecaa8fdb6a716389149bace35b52.tar.gz
RTCs: handle NVRAM better
Several of the RTC drivers are exporting binary "nvram" files in sysfs. Such NVRAM (or on many systems, EEPROM) data is often initialized during system manufacture to hold data about identity (serial numbers, Ethernet addresses, etc), configuration, calibration, and so forth. This patch improves integrity and security of those files: - Correctly initializes the size in one of the two cases where that was not yet being done. - Improves system security/integrity by making this state not be world-writable by default. Letting arbitrary userspace code mangle such state by default is at least Not A Good Thing; and it could sometimes be worse, depending on the particular data that might be corrupted. (I disregard the paranoiac "don't let anyone read it either" approach. Anyone storing passwords in such memory doesn't really care about security.) Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Acked-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Cc: Torsten Ertbjerg Rasmussen <tr@newtec.dk> Cc: Mark Zhan <rongkai.zhan@windriver.com> Cc: Thomas Hommel <thomas.hommel@gefanuc.com> Acked-by: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--drivers/rtc/rtc-ds1553.c2
-rw-r--r--drivers/rtc/rtc-ds1742.c5
-rw-r--r--drivers/rtc/rtc-m48t59.c3
-rw-r--r--drivers/rtc/rtc-stk17ta8.c2
4 files changed, 8 insertions, 4 deletions
diff --git a/drivers/rtc/rtc-ds1553.c b/drivers/rtc/rtc-ds1553.c
index bb53c09bad1..d9e848dcd45 100644
--- a/drivers/rtc/rtc-ds1553.c
+++ b/drivers/rtc/rtc-ds1553.c
@@ -291,7 +291,7 @@ static ssize_t ds1553_nvram_write(struct kobject *kobj,
static struct bin_attribute ds1553_nvram_attr = {
.attr = {
.name = "nvram",
- .mode = S_IRUGO | S_IWUGO,
+ .mode = S_IRUGO | S_IWUSR,
},
.size = RTC_OFFSET,
.read = ds1553_nvram_read,
diff --git a/drivers/rtc/rtc-ds1742.c b/drivers/rtc/rtc-ds1742.c
index c535b78698e..2e73f0b183b 100644
--- a/drivers/rtc/rtc-ds1742.c
+++ b/drivers/rtc/rtc-ds1742.c
@@ -160,10 +160,13 @@ static ssize_t ds1742_nvram_write(struct kobject *kobj,
static struct bin_attribute ds1742_nvram_attr = {
.attr = {
.name = "nvram",
- .mode = S_IRUGO | S_IWUGO,
+ .mode = S_IRUGO | S_IWUSR,
},
.read = ds1742_nvram_read,
.write = ds1742_nvram_write,
+ /* REVISIT: size in sysfs won't match actual size... if it's
+ * not a constant, each RTC should have its own attribute.
+ */
};
static int __devinit ds1742_rtc_probe(struct platform_device *pdev)
diff --git a/drivers/rtc/rtc-m48t59.c b/drivers/rtc/rtc-m48t59.c
index 2bad1637330..cd0bbc0e803 100644
--- a/drivers/rtc/rtc-m48t59.c
+++ b/drivers/rtc/rtc-m48t59.c
@@ -353,11 +353,12 @@ static ssize_t m48t59_nvram_write(struct kobject *kobj,
static struct bin_attribute m48t59_nvram_attr = {
.attr = {
.name = "nvram",
- .mode = S_IRUGO | S_IWUGO,
+ .mode = S_IRUGO | S_IWUSR,
.owner = THIS_MODULE,
},
.read = m48t59_nvram_read,
.write = m48t59_nvram_write,
+ .size = M48T59_NVRAM_SIZE,
};
static int __devinit m48t59_rtc_probe(struct platform_device *pdev)
diff --git a/drivers/rtc/rtc-stk17ta8.c b/drivers/rtc/rtc-stk17ta8.c
index 8288b6b2bf2..a265da7c6ff 100644
--- a/drivers/rtc/rtc-stk17ta8.c
+++ b/drivers/rtc/rtc-stk17ta8.c
@@ -291,7 +291,7 @@ static ssize_t stk17ta8_nvram_write(struct kobject *kobj,
static struct bin_attribute stk17ta8_nvram_attr = {
.attr = {
.name = "nvram",
- .mode = S_IRUGO | S_IWUGO,
+ .mode = S_IRUGO | S_IWUSR,
.owner = THIS_MODULE,
},
.size = RTC_OFFSET,