RTCs: handle NVRAM better (a4b1d50e) · Commits · 戴 / test

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>

drivers/rtc/rtc-ds1553.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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,

drivers/rtc/rtc-ds1742.c

+4 −1

Original line number	Diff line number	Diff line
		@@ -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)

drivers/rtc/rtc-m48t59.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -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)

drivers/rtc/rtc-stk17ta8.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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,

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