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8a0a9bd4db
linux/drivers
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Linus Torvalds 8a0a9bd4db random: make get_random_int() more random 
It's a really simple patch that basically just open-codes the current
"secure_ip_id()" call, but when open-coding it we now use a _static_
hashing area, so that it gets updated every time.

And to make sure somebody can't just start from the same original seed of
all-zeroes, and then do the "half_md4_transform()" over and over until
they get the same sequence as the kernel has, each iteration also mixes in
the same old "current->pid + jiffies" we used - so we should now have a
regular strong pseudo-number generator, but we also have one that doesn't
have a single seed.

Note: the "pid + jiffies" is just meant to be a tiny tiny bit of noise. It
has no real meaning. It could be anything. I just picked the previous
seed, it's just that now we keep the state in between calls and that will
feed into the next result, and that should make all the difference.

I made that hash be a per-cpu data just to avoid cache-line ping-pong:
having multiple CPU's write to the same data would be fine for randomness,
and add yet another layer of chaos to it, but since get_random_int() is
supposed to be a fast interface I did it that way instead. I considered
using "__raw_get_cpu_var()" to avoid any preemption overhead while still
getting the hash be _mostly_ ping-pong free, but in the end good taste won
out.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-05-07 11:59:06 -07:00
..
accessibility
acpi acpica: validate package element more carefully in acpi_rs_get_pci_routing_table_length 2009-05-02 11:48:37 -07:00
amba
ata [libata] fix build error on drivers/ata/pata_legacy.c 2009-04-17 19:05:33 -04:00
atm Replace all DMA_nBIT_MASK macro with DMA_BIT_MASK(n) 2009-04-13 15:04:33 -07:00
auxdisplay
base drivers/base/iommu.c: add missing includes 2009-05-06 16:36:10 -07:00
block hd: fix locking 2009-04-28 20:24:20 +02:00
bluetooth
cdrom
char random: make get_random_int() more random 2009-05-07 11:59:06 -07:00
clocksource clocksource: pass clocksource to read() callback 2009-04-21 13:41:47 -07:00
connector
cpufreq
cpuidle
crypto dma-mapping: replace all DMA_32BIT_MASK macro with DMA_BIT_MASK(32) 2009-04-07 08:31:11 -07:00
dca
dio
dma dma-mapping: replace all DMA_32BIT_MASK macro with DMA_BIT_MASK(32) 2009-04-07 08:31:11 -07:00
edac edac: ppc mpc85xx fix mc err detect 2009-04-21 13:41:51 -07:00
eisa
firewire
firmware ibft: fix the display of a few fields in the NIC attribute structure in sysfs 2009-05-02 15:36:10 -07:00
gpio Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2009-04-03 15:24:35 -07:00
gpu Merge branch 'drm-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6 2009-05-05 17:02:05 -07:00
hid HID: fix oops in hid_check_keys_pressed() 2009-05-02 00:02:57 +02:00
hwmon hwmon: sht15 humidity sensor driver 2009-04-13 15:04:29 -07:00
i2c i2c-algo-pca: Let PCA9564 recover from unacked data byte (state 0x30) 2009-05-05 08:39:25 +02:00
ide ide-cd: fix REQ_QUIET tests in cdrom_decode_status 2009-04-30 18:24:34 +02:00
idle dma-mapping: replace all DMA_64BIT_MASK macro with DMA_BIT_MASK(64) 2009-04-07 08:31:10 -07:00
ieee1394 dma-mapping: replace all DMA_32BIT_MASK macro with DMA_BIT_MASK(32) 2009-04-07 08:31:11 -07:00
infiniband Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-rc-fixes-2.6 2009-05-02 16:36:34 -07:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2009-05-02 16:35:45 -07:00
isdn Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2009-04-29 07:55:45 -07:00
leds leds: just ignore invalid GPIOs in leds-gpio 2009-04-08 14:13:48 +01:00
lguest lguest: fix guest crash on non-linear addresses in gdt pvops 2009-04-19 23:14:01 +09:30
macintosh Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/bart/ide-2.6 2009-04-24 08:16:05 -07:00
mca
md Merge branch 'for-linus' of git://neil.brown.name/md 2009-04-20 08:37:37 -07:00
media V4L/DVB (11652): au0828: fix kernel oops regression on USB disconnect. 2009-04-29 16:02:51 -03:00
memstick dma-mapping: replace all DMA_32BIT_MASK macro with DMA_BIT_MASK(32) 2009-04-07 08:31:11 -07:00
message scsi: mpt: suppress debugobjects warning 2009-04-21 13:41:50 -07:00
mfd mfd: fix da903x warning 2009-04-05 00:32:25 +02:00
misc isl29003: fix resume functionality 2009-05-06 16:36:10 -07:00
mmc Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/drzeus/mmc 2009-05-05 08:23:16 -07:00
mtd cafe_nand: Fix warning 2009-04-24 07:52:08 -07:00
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2009-05-05 08:26:10 -07:00
nubus
of
oprofile Merge branch 'tracing-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-04-05 11:04:19 -07:00
parisc parport: Fix various uses of parport_pc 2009-04-14 08:48:50 -07:00
parport parport: Use the PCI IRQ if offered 2009-04-07 08:44:06 -07:00
pci PCI: only save/restore existent registers in the PCIe capability 2009-04-22 15:59:41 -07:00
pcmcia [ARM] 5458/1: pcmcia: pxa2xx-sharpsl: check if we do have Scoop config 2009-04-23 23:25:40 +01:00
platform Merge branch 'sony-laptop' into release 2009-04-24 01:34:52 -04:00
pnp dma-mapping: replace all DMA_24BIT_MASK macro with DMA_BIT_MASK(24) 2009-04-07 08:31:12 -07:00
power Merge git://git.infradead.org/battery-2.6 2009-04-08 17:45:02 -07:00
ps3
rapidio dma-mapping: replace all DMA_32BIT_MASK macro with DMA_BIT_MASK(32) 2009-04-07 08:31:11 -07:00
regulator regulator: Fix default constraints for fixed voltage regulators 2009-04-28 18:58:08 +01:00
rtc rtc-cmos: fix printk output 2009-04-21 13:41:50 -07:00
s390 [SCSI] zfcp: Fix oops when port disappears 2009-04-27 10:07:37 -05:00
sbus sbus: changed ioctls to unlocked 2009-04-14 19:46:19 -07:00
scsi [SCSI] libosd: OSD2r05: on-the-wire changes for latest OSD2 revision 5. 2009-04-27 11:05:49 -05:00
serial Merge master.kernel.org:/home/rmk/linux-2.6-arm 2009-05-07 10:54:32 -07:00
sh sh: intc: Added resume from hibernation support to the intc 2009-04-06 08:55:19 -07:00
sn dma-mapping: replace all DMA_64BIT_MASK macro with DMA_BIT_MASK(64) 2009-04-07 08:31:10 -07:00
spi spi: pxa2xx: limit reaches -1 2009-04-21 13:41:49 -07:00
ssb
staging go7007: Convert to the new i2c device binding model 2009-04-21 21:47:22 +02:00
tc
telephony
thermal
uio UIO: fix specific device driver missing statement for depmod 2009-04-16 16:17:11 -07:00
usb USB: otg: Fix bug on remove path without transceiver 2009-04-23 14:15:31 -07:00
uwb dma-mapping: replace all DMA_32BIT_MASK macro with DMA_BIT_MASK(32) 2009-04-07 08:31:11 -07:00
video Merge master.kernel.org:/home/rmk/linux-2.6-arm 2009-05-07 10:54:32 -07:00
virtio virtio: fix suspend when using virtio_balloon 2009-04-19 23:14:01 +09:30
w1 mfd: remove DS1WM clock handling 2009-04-05 00:32:22 +02:00
watchdog [ARM] 5460/1: Orion: reduce namespace pollution 2009-04-23 23:25:41 +01:00
xen [IA64] xen_domu_defconfig: fix build issues/warnings 2009-05-05 11:43:13 -07:00
zorro
Kconfig
Makefile V4L/DVB (11561a): move media after i2c 2009-04-29 15:41:13 -03:00