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Prarit Bhargava 3d035f5806 drivers/char/hpet.c: allow user controlled mmap for user processes 
The CONFIG_HPET_MMAP Kconfig option exposes the memory map of the HPET
registers to userspace.  The Kconfig help points out that in some cases
this can be a security risk as some systems may erroneously configure the
map such that additional data is exposed to userspace.

This is a problem for distributions -- some users want the MMAP
functionality but it comes with a significant security risk.  In an effort
to mitigate this risk, and due to the low number of users of the MMAP
functionality, I've introduced a kernel parameter, hpet_mmap_enable, that
is required in order to actually have the HPET MMAP exposed.

Signed-off-by: Prarit Bhargava <prarit@redhat.com>
Acked-by: Matt Wilson <msw@amazon.com>
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2013-11-13 12:09:11 +09:00
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accessibility
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acpi Merge branch 'x86-mce-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-11-12 11:16:44 +09:00
amba
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ata DeviceTree updates for 3.13. This is a bit larger pull request than 2013-11-12 16:52:17 +09:00
atm
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auxdisplay
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base regmap: Updates for v3.13 2013-11-12 14:47:00 +09:00
bcma Merge 3.12-rc6 into driver-core-next 2013-10-19 13:05:38 -07:00
block Via Paul Walmsley <paul@pwsan.com>: 2013-10-28 14:39:03 -07:00
bluetooth Bluetooth: btusb: Add support for Belkin F8065bf 2013-09-23 17:44:25 -03:00
bus ARM: driver updates for 3.13 2013-11-11 17:05:37 +09:00
cdrom
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char drivers/char/hpet.c: allow user controlled mmap for user processes 2013-11-13 12:09:11 +09:00
clk DeviceTree updates for 3.13. This is a bit larger pull request than 2013-11-12 16:52:17 +09:00
clocksource clocksource: sun4i: remove IRQF_DISABLED 2013-10-22 22:36:50 +02:00
connector connector: use 'size' everywhere in cn_netlink_send() 2013-10-02 16:03:50 -04:00
cpufreq DeviceTree updates for 3.13. This is a bit larger pull request than 2013-11-12 16:52:17 +09:00
cpuidle cpuidle: calxeda: add support to use PSCI calls 2013-10-01 16:30:56 -05:00
crypto powerpc: add missing explicit OF includes for ppc 2013-11-11 09:10:50 -06:00
dca
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devfreq
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dio
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dma DeviceTree updates for 3.13. This is a bit larger pull request than 2013-11-12 16:52:17 +09:00
edac DeviceTree updates for 3.13. This is a bit larger pull request than 2013-11-12 16:52:17 +09:00
eisa
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extcon Update extcon for 3.13 2013-09-26 20:47:25 -07:00
firewire
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firmware Merge branch 'x86-mce-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-11-12 11:16:44 +09:00
fmc
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gpio DeviceTree updates for 3.13. This is a bit larger pull request than 2013-11-12 16:52:17 +09:00
gpu Merge branch 'x86-intel-mid-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-11-12 11:12:22 +09:00
hid Staging driver update for 3.13-rc1 2013-11-07 15:07:58 +09:00
hsi hsi: convert bus code to use dev_groups 2013-10-16 18:36:04 -07:00
hv Drivers: hv: vmbus: Fix a bug in channel rescind code 2013-10-19 19:53:46 -07:00
hwmon spi: Updates for v3.13 2013-11-12 15:01:39 +09:00
hwspinlock
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i2c Merge remote-tracking branch 'grant/devicetree/next' into for-next 2013-11-07 10:34:46 -06:00
ide H8/300 has been dead for several years, the kernel for it has 2013-11-12 14:13:14 +09:00
idle sched, idle: Fix the idle polling state logic 2013-09-25 13:53:10 +02:00
iio iio: light: vcnl4000: Remove redundant code 2013-10-24 14:48:14 +01:00
infiniband Merge git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2013-10-27 10:16:33 -07:00
input DeviceTree updates for 3.13. This is a bit larger pull request than 2013-11-12 16:52:17 +09:00
iommu drivers/iommu/omap-iopgtable.h: remove unneeded cast of void* 2013-11-13 12:09:00 +09:00
ipack ipack: convert bus code to use dev_groups 2013-10-16 18:40:57 -07:00
irqchip Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-11-12 10:02:59 +09:00
isdn
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leds leds: lp55xx: handle enable pin in driver 2013-10-25 10:13:25 -07:00
lguest
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macintosh DeviceTree updates for 3.13. This is a bit larger pull request than 2013-11-12 16:52:17 +09:00
mailbox
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md Driver Core / sysfs patches for 3.13-rc1 2013-11-07 11:42:15 +09:00
media DeviceTree updates for 3.13. This is a bit larger pull request than 2013-11-12 16:52:17 +09:00
memory
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memstick memstick: convert bus code to use dev_groups 2013-10-16 18:40:58 -07:00
message i2o: convert bus code to use dev_groups 2013-10-16 18:40:58 -07:00
mfd sound updates for 3.13-rc1 2013-11-12 15:29:53 +09:00
misc DeviceTree updates for 3.13. This is a bit larger pull request than 2013-11-12 16:52:17 +09:00
mmc Merge 3.12-rc6 into driver-core-next 2013-10-19 13:05:38 -07:00
mtd DeviceTree updates for 3.13. This is a bit larger pull request than 2013-11-12 16:52:17 +09:00
net DeviceTree updates for 3.13. This is a bit larger pull request than 2013-11-12 16:52:17 +09:00
nfc
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ntb
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nubus
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of DeviceTree updates for 3.13. This is a bit larger pull request than 2013-11-12 16:52:17 +09:00
oprofile
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parisc
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parport H8/300 has been dead for several years, the kernel for it has 2013-11-12 14:13:14 +09:00
pci DeviceTree updates for 3.13. This is a bit larger pull request than 2013-11-12 16:52:17 +09:00
pcmcia DeviceTree updates for 3.13. This is a bit larger pull request than 2013-11-12 16:52:17 +09:00
phy usb: patches for v3.13 2013-10-24 16:18:40 +01:00
pinctrl GPIO bulk changes for the v3.13 development cycle 2013-11-12 15:50:46 +09:00
platform sound updates for 3.13-rc1 2013-11-12 15:29:53 +09:00
pnp PNP: convert bus code to use dev_groups 2013-10-16 18:36:02 -07:00
power
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pps
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ps3
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ptp ptp: switch to use gpiolib 2013-09-27 14:15:27 +02:00
pwm
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rapidio rapidio: convert bus code to use dev_groups 2013-10-16 18:36:03 -07:00
regulator Merge remote-tracking branch 'regulator/topic/tps65910' into regulator-next 2013-10-24 11:11:43 +01:00
remoteproc
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reset
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rpmsg
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rtc DeviceTree updates for 3.13. This is a bit larger pull request than 2013-11-12 16:52:17 +09:00
s390 s390/scm_blk: fix endless loop for requests != REQ_TYPE_FS 2013-11-06 14:32:22 +01:00
sbus
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scsi Driver Core / sysfs patches for 3.13-rc1 2013-11-07 11:42:15 +09:00
sfi
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sh
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sn
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spi DeviceTree updates for 3.13. This is a bit larger pull request than 2013-11-12 16:52:17 +09:00
ssb ssb: convert bus code to use dev_groups 2013-10-16 18:36:03 -07:00
staging GPIO bulk changes for the v3.13 development cycle 2013-11-12 15:50:46 +09:00
target target/pscsi: fix return value check 2013-10-25 10:42:09 -07:00
tc
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thermal Merge branch 'x86_pkg_temp' of .git into for-rc 2013-10-21 11:26:45 +08:00
tty DeviceTree updates for 3.13. This is a bit larger pull request than 2013-11-12 16:52:17 +09:00
uio Char/Misc patches for 3.13-rc1 2013-11-07 09:41:06 +09:00
usb DeviceTree updates for 3.13. This is a bit larger pull request than 2013-11-12 16:52:17 +09:00
uwb Driver Core / sysfs patches for 3.13-rc1 2013-11-07 11:42:15 +09:00
vfio VFIO: vfio_iommu_type1: fix bug caused by break in nested loop 2013-10-11 10:40:46 -06:00
vhost vhost/scsi: Fix incorrect usage of get_user_pages_fast write parameter 2013-10-25 11:03:34 -07:00
video drivers/video/acornfb.c: use __free_reserved_page() to simplify the code 2013-11-13 12:09:03 +09:00
virt drivers: clean-up prom.h implicit includes 2013-10-09 20:04:04 -05:00
virtio virtio: convert bus code to use dev_groups 2013-10-16 18:40:57 -07:00
vlynq
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vme
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w1 w1-gpio: Use devm_* functions 2013-10-29 16:58:18 -07:00
watchdog DeviceTree updates for 3.13. This is a bit larger pull request than 2013-11-12 16:52:17 +09:00
xen xenbus: convert bus code to use dev_groups 2013-10-16 18:36:03 -07:00
zorro
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Kconfig drivers: phy: add generic PHY framework 2013-09-27 17:35:41 -07:00
Makefile drivers: phy: add generic PHY framework 2013-09-27 17:35:41 -07:00