]> git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/commit
RTCs: handle NVRAM better
authorDavid Brownell <david-b@pacbell.net>
Thu, 15 Nov 2007 00:58:30 +0000 (16:58 -0800)
committerLinus Torvalds <torvalds@woody.linux-foundation.org>
Thu, 15 Nov 2007 02:45:36 +0000 (18:45 -0800)
commita4b1d50e6158ecaa8fdb6a716389149bace35b52
tree90649fc6d9bcf2aa2684fde7d982d0f752f1e9f4
parent779d20892f8e716677194dc879eea2b5f1e75678
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>
drivers/rtc/rtc-ds1553.c
drivers/rtc/rtc-ds1742.c
drivers/rtc/rtc-m48t59.c
drivers/rtc/rtc-stk17ta8.c