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David Brownell a4b1d50e61 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>
 		2007-11-14 18:45:36 -08:00
..
acorn/char unicode diacritics support 2007-10-17 08:42:52 -07:00
acpi Fix Oops in toshiba_acpi error return path 2007-11-14 18:45:36 -08:00
amba
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ata libata: Don't fail device revalidation for bad _GTF methods 2007-11-10 00:31:27 -05:00
atm Eliminate pointless casts from void* in a few driver irq handlers. 2007-10-23 19:53:16 -04:00
auxdisplay
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base cleanup asm/scatterlist.h includes 2007-11-02 08:47:06 +01:00
block [NET]: Add the helper kernel_sock_shutdown() 2007-11-12 18:10:39 -08:00
bluetooth [Bluetooth] Add generic driver for Bluetooth USB devices 2007-10-22 02:59:46 -07:00
cdrom SG: audit of drivers that use blk_rq_map_sg() 2007-10-24 13:21:21 +02:00
char [TTY]: Fix network driver interactions with TCGET/SET calls. 2007-11-07 04:14:19 -08:00
clocksource
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connector [CONNECTOR]: Fix a spurious kfree_skb() call 2007-10-30 21:29:47 -07:00
cpufreq
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cpuidle cpuidle: remove unused exports 2007-10-29 17:27:50 -04:00
crypto [CRYPTO] users: Fix up scatterlist conversion errors 2007-10-27 00:52:07 -07:00
dca I/OAT: Add DCA services 2007-10-16 09:43:09 -07:00
dio
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dma Remove bogus default y for DMAR and NET_DMA 2007-10-30 08:06:55 -07:00
edac NULL terminate the pci_device_ids in pasemi_edac 2007-10-19 11:53:56 -07:00
eisa
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firewire firewire: fw-sbp2: fix refcounting 2007-11-07 01:59:28 +01:00
firmware define global BIT macro 2007-10-19 11:53:42 -07:00
hid HID: Don't access input_dev->private directly 2007-10-31 13:30:35 +01:00
hwmon hwmon: (i5k_amb) Convert macros to C functions 2007-11-08 08:42:47 -05:00
i2c typo fixes 2007-10-20 01:34:40 +02:00
ide ide: remove stale/incorrect comment from setup-pci.c 2007-11-13 22:09:16 +01:00
ieee1394 ieee1394: iso and async streams: s/g list fix 2007-11-04 14:31:16 +01:00
infiniband Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband 2007-10-30 15:26:56 -07:00
input Use i8253.c lock for PC speaker on MIPS, too. 2007-11-02 19:39:18 -07:00
isdn i4l: errors with assignments in if 2007-11-05 15:12:31 -08:00
kvm KVM: SVM: Intercept the 'invd' and 'wbinvd' instructions 2007-11-08 12:05:45 +02:00
leds leds: bugfixes for leds-gpio 2007-11-05 21:54:41 +00:00
lguest virtio: Force use of power-of-two for descriptor ring sizes 2007-11-12 13:59:40 +11:00
macintosh [POWERPC] windfarm: Fix windfarm thread freezer interaction 2007-11-08 14:15:34 +11:00
mca
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md Add UNPLUG traces to all appropriate places 2007-11-09 13:41:32 +01:00
media V4L/DVB (6548): pvrusb2: Fix oops on module removal 2007-11-04 21:41:30 -02:00
message i2o: debug messages corrected 2007-11-05 15:12:31 -08:00
mfd typo fixes 2007-10-20 01:34:40 +02:00
misc fujitsu-laptop.c: remove dead code 2007-10-25 17:43:46 -04:00
mmc Add missing "\n" to log message 2007-11-10 11:59:49 +01:00
mtd Eliminate pointless casts from void* in a few driver irq handlers. 2007-10-23 19:53:16 -04:00
net [NET]: Move unneeded data to initdata section. 2007-11-13 03:23:50 -08:00
nubus
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of [SPARC/64]: Consolidate of_register_driver 2007-10-17 21:17:42 -07:00
oprofile
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parisc parisc: fix sg_page() fallout 2007-10-23 09:49:31 +02:00
parport [PARPORT] Remove unused 'irq' argument from parport irq functions 2007-10-23 19:53:16 -04:00
pci PCI: Add Kconfig option to disable deprecated pci_find_* API 2007-11-05 13:35:17 -08:00
pcmcia remove asm/bitops.h includes 2007-10-19 11:53:41 -07:00
pnp PNP: add debug message for adding new device 2007-10-17 08:43:04 -07:00
power Merge git://git.infradead.org/battery-2.6 2007-10-22 19:20:52 -07:00
ps3 remove asm/bitops.h includes 2007-10-19 11:53:41 -07:00
rapidio
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rtc RTCs: handle NVRAM better 2007-11-14 18:45:36 -08:00
s390 [S390] Fix priority mistakes in drivers/s390/cio/cmf.c 2007-11-05 11:10:17 +01:00
sbus vfc_dev conversion to mutex: fallout 2007-10-20 15:04:06 -07:00
scsi PCI: Add Kconfig option to disable deprecated pci_find_* API 2007-11-05 13:35:17 -08:00
serial Merge master.kernel.org:/pub/scm/linux/kernel/git/lethal/sh-2.6 2007-11-09 15:25:29 -08:00
sh superhyway: Handle device_register() retval properly. 2007-11-07 11:13:55 +09:00
sn
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spi fix abuses of ptrdiff_t 2007-10-29 07:41:33 -07:00
ssb ssb: Fix PCMCIA-host lowlevel bus access 2007-11-10 22:01:53 -08:00
tc lk201: remove obsolete driver 2007-10-17 08:42:57 -07:00
telephony telephony: phonedev panics if unregistering device not registered [Bug 9266] 2007-11-05 15:12:33 -08:00
uio
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usb cleanup asm/scatterlist.h includes 2007-11-02 08:47:06 +01:00
video [ARM] 4645/1: Cyberpro: Trivial fix to restore 16bpp mode. 2007-11-08 23:29:36 +00:00
virtio virtio: Force use of power-of-two for descriptor ring sizes 2007-11-12 13:59:40 +11:00
w1 Kbuild/doc: fix links to Documentation files 2007-10-30 14:26:30 -07:00
watchdog Merge git://git.kernel.org/pub/scm/linux/kernel/git/wim/linux-2.6-watchdog 2007-11-02 19:36:26 -07:00
xen Add missing newlines to some uses of dev_<level> messages 2007-10-18 14:37:28 -07:00
zorro Convert files to UTF-8 and some cleanups 2007-10-19 23:21:04 +02:00
Kconfig Virtio interface 2007-10-23 15:49:54 +10:00
Makefile Merge master.kernel.org:/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2007-10-23 16:37:29 -07:00