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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 /drivers/rtc/rtc-stk17ta8.c
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>
Diffstat (limited to 'drivers/rtc/rtc-stk17ta8.c')
-rw-r--r--drivers/rtc/rtc-stk17ta8.c2
1 files changed, 1 insertions, 1 deletions
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,