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0110bbfbc8
linux/drivers
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Theodore Ts'o 0110bbfbc8 random: make 'add_interrupt_randomness()' do something sane 
commit 775f4b297b upstream.

We've been moving away from add_interrupt_randomness() for various
reasons: it's too expensive to do on every interrupt, and flooding the
CPU with interrupts could theoretically cause bogus floods of entropy
from a somewhat externally controllable source.

This solves both problems by limiting the actual randomness addition
to just once a second or after 64 interrupts, whicever comes first.
During that time, the interrupt cycle data is buffered up in a per-cpu
pool.  Also, we make sure the the nonblocking pool used by urandom is
initialized before we start feeding the normal input pool.  This
assures that /dev/urandom is returning unpredictable data as soon as
possible.

(Based on an original patch by Linus, but significantly modified by
tytso.)

Tested-by: Eric Wustrow <ewust@umich.edu>
Reported-by: Eric Wustrow <ewust@umich.edu>
Reported-by: Nadia Heninger <nadiah@cs.ucsd.edu>
Reported-by: Zakir Durumeric <zakir@umich.edu>
Reported-by: J. Alex Halderman <jhalderm@umich.edu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-08-15 08:10:10 -07:00
..
accessibility
acpi ACPI processor: Fix tick_broadcast_mask online/offline regression 2012-08-15 08:10:09 -07:00
amba ARM: 7366/3: amba: Remove AMBA level regulator support 2012-04-13 14:04:08 +01:00
ata ata_piix: defer disks to the Hyper-V drivers by default 2012-06-17 11:21:29 -07:00
atm solos-pci: Fix DMA support 2012-06-10 00:36:08 +09:00
auxdisplay
base PM / Sleep: call early resume handlers when suspend_noirq fails 2012-08-09 08:31:30 -07:00
bcma bcma: add ext PA workaround for BCM4331 and BCM43431 2012-06-17 11:21:26 -07:00
block umem: fix up unplugging 2012-07-16 09:04:08 -07:00
bluetooth Merge branch 'for-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth 2012-04-27 15:16:43 -04:00
cdrom
char random: make 'add_interrupt_randomness()' do something sane 2012-08-15 08:10:10 -07:00
clk clk: Check parent for NULL in clk_change_rate 2012-07-19 08:58:59 -07:00
clocksource Revert "clocksource: Load the ACPI PM clocksource asynchronously" 2012-04-12 00:05:05 +02:00
connector
cpufreq cpufreq: OMAP: fix build errors: depends on ARCH_OMAP2PLUS 2012-04-13 17:57:40 -07:00
cpuidle Merge branches 'idle-fix' and 'misc' into release 2012-04-06 21:48:59 -04:00
crypto crypto: mv_cesa requires on CRYPTO_HASH to build 2012-05-15 01:10:06 +00:00
dca
devfreq ARM: global cleanups 2012-03-27 16:03:32 -07:00
dio
dma dmaengine: pl330: dont complete descriptor for cyclic dma 2012-07-16 09:04:09 -07:00
edac edac: fix the error about memory type detection on SandyBridge 2012-06-22 11:37:15 -07:00
eisa
firewire Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
firmware pcdp: use early_ioremap/early_iounmap to access pcdp table 2012-08-15 08:10:05 -07:00
gpio gpiolib: wm8994: Pay attention to the value set when enabling as output 2012-07-16 09:04:09 -07:00
gpu nouveau: Fix alignment requirements on src and dst addresses 2012-08-09 08:31:40 -07:00
hid HID: multitouch: Add support for Baanto touchscreen 2012-07-29 08:04:19 -07:00
hsi HSI: hsi_char: Remove max_data_size from sysfs 2012-04-23 14:23:32 +03:00
hv
hwmon hwmon: (it87) Preserve configuration register bits on init 2012-07-19 08:58:55 -07:00
hwspinlock hwspinlock/core: use global ID to register hwspinlocks on multiple devices 2012-07-16 09:04:25 -07:00
i2c i2c: tegra: notify transfer-complete after clearing status. 2012-06-01 15:18:28 +08:00
ide Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
idle simple_open: automatically convert to simple_open() 2012-04-05 15:25:50 -07:00
ieee802154
infiniband IB/core: Fix mismatch between locked and pinned pages 2012-06-01 15:18:17 +08:00
input Input: xpad - add Andamiro Pump It Up pad 2012-07-19 08:58:58 -07:00
iommu iommu/amd: Fix hotplug with iommu=pt 2012-08-09 08:31:32 -07:00
isdn isdn/gigaset: improve error handling querying firmware version 2012-06-01 15:18:14 +08:00
leds drivers/leds: correct __devexit annotations 2012-05-10 15:06:44 -07:00
lguest
macintosh Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
mca
md md/raid1: don't abort a resync on the first badblock. 2012-08-15 08:10:08 -07:00
media media: ene_ir: Fix driver initialisation 2012-08-15 08:10:05 -07:00
memstick
message Disintegrate and delete asm/system.h 2012-03-28 15:58:21 -07:00
mfd random: make 'add_interrupt_randomness()' do something sane 2012-08-15 08:10:10 -07:00
misc Merge branch 'akpm' (Andrew's patch-bomb) 2012-04-05 15:30:34 -07:00
mmc mmc: sdhci: fix incorrect command used in tuning 2012-08-09 08:31:27 -07:00
mtd mtd: nandsim: don't open code a do_div helper 2012-07-19 08:58:55 -07:00
net ath9k: Add PID/VID support for AR1111 2012-08-15 08:10:10 -07:00
nfc
nubus Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
of gpio: Fix range check in of_gpio_simple_xlate() 2012-04-10 14:20:56 -06:00
oprofile oprofile: perf: use NR_CPUS instead or nr_cpumask_bits for static array 2012-07-16 09:04:21 -07:00
parisc parisc: move definition of PAGE0 to asm/page.h 2012-05-10 15:12:08 -07:00
parport
pci PCI: EHCI: fix crash during suspend on ASUS computers 2012-07-16 09:04:39 -07:00
pcmcia Merge git://git.kernel.org/pub/scm/linux/kernel/git/brodo/pcmcia 2012-03-29 16:00:48 -07:00
pinctrl pinctrl: implement pinctrl_check_ops 2012-04-11 09:31:02 +02:00
platform asus-wmi: use ASUS_WMI_METHODID_DSTS2 as default DSTS ID. 2012-08-15 08:10:04 -07:00
pnp Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux 2012-03-30 16:45:39 -07:00
power Various small bugfixes and enhancements, plus two new drivers: 2012-03-30 16:09:02 -07:00
pps
ps3
ptp ptp_pch: Add missing #include <linux/slab.h> 2012-05-16 14:44:44 -04:00
rapidio
regulator regulator: core: Release regulator-regulator supplies on error 2012-06-01 15:18:15 +08:00
remoteproc remoteproc: fix missing CONFIG_FW_LOADER configurations 2012-07-16 09:04:25 -07:00
rpmsg rpmsg: fix dependency on initialization order 2012-07-19 08:58:57 -07:00
rtc drivers/rtc/rtc-mxc.c: fix irq enabled interrupts warning 2012-07-16 09:04:44 -07:00
s390 qeth: repair crash in qeth_l3_vlan_rx_kill_vid() 2012-08-09 08:31:38 -07:00
sbus Remove all #inclusions of asm/system.h 2012-03-28 18:30:03 +01:00
scsi SCSI: Avoid dangling pointer in scsi_requeue_command() 2012-08-09 08:31:28 -07:00
sfi
sh SuperH updates for 3.4 merge window 2012-03-30 00:09:17 -07:00
sn
spi spi/pl022: disable port when unused 2012-08-09 08:31:38 -07:00
ssb
staging staging: zsmalloc: Finish conversion to a separate module 2012-08-09 08:31:37 -07:00
target iscsi-target: Drop bogus struct file usage for iSCSI/SCTP 2012-08-09 08:31:26 -07:00
tc
thermal
tty xen/hvc: Check HVM_PARAM_CONSOLE_[EVTCHN|PFN] for correctness. 2012-06-22 11:36:54 -07:00
uio
usb USB: echi-dbgp: increase the controller wait time to come out of halt. 2012-08-09 08:31:51 -07:00
uwb uwb: fix error handling 2012-04-18 13:15:51 -07:00
vhost vhost-net: fix handle_rx buffer size 2012-05-11 18:16:57 -04:00
video video/smscufx: fix line counting in fb_write 2012-08-15 08:10:08 -07:00
virt
virtio virtio: balloon: let host know of updated balloon size before module removal 2012-05-17 12:14:34 +03:00
vlynq
w1
watchdog hpwdt: Only BYTE reads/writes to WD Timer port 0x72 2012-04-26 14:38:07 +02:00
xen xen: do not map the same GSI twice in PVHVM guests. 2012-06-01 15:18:25 +08:00
zorro
Kconfig Merge branch 'for-next' of git://gitorious.org/kernel-hsi/kernel-hsi 2012-04-02 09:50:40 -07:00
Makefile Merge branch 'for-next' of git://gitorious.org/kernel-hsi/kernel-hsi 2012-04-02 09:50:40 -07:00