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
acpica: validate package element more carefully in acpi_rs_get_pci_routing_table_length
2009-05-02 11:48:37 -07:00
[libata] fix build error on drivers/ata/pata_legacy.c
2009-04-17 19:05:33 -04:00
Replace all DMA_nBIT_MASK macro with DMA_BIT_MASK(n)
2009-04-13 15:04:33 -07:00
drivers/base/iommu.c: add missing includes
2009-05-06 16:36:10 -07:00
hd: fix locking
2009-04-28 20:24:20 +02:00
random: make get_random_int() more random
2009-05-07 11:59:06 -07:00
clocksource: pass clocksource to read() callback
2009-04-21 13:41:47 -07:00
dma-mapping: replace all DMA_32BIT_MASK macro with DMA_BIT_MASK(32)
2009-04-07 08:31:11 -07:00
dma-mapping: replace all DMA_32BIT_MASK macro with DMA_BIT_MASK(32)
2009-04-07 08:31:11 -07:00
edac: ppc mpc85xx fix mc err detect
2009-04-21 13:41:51 -07:00
ibft: fix the display of a few fields in the NIC attribute structure in sysfs
2009-05-02 15:36:10 -07:00
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: fix oops in hid_check_keys_pressed()
2009-05-02 00:02:57 +02:00
hwmon: sht15 humidity sensor driver
2009-04-13 15:04:29 -07:00
i2c-algo-pca: Let PCA9564 recover from unacked data byte (state 0x30)
2009-05-05 08:39:25 +02:00
ide-cd: fix REQ_QUIET tests in cdrom_decode_status
2009-04-30 18:24:34 +02:00
dma-mapping: replace all DMA_64BIT_MASK macro with DMA_BIT_MASK(64)
2009-04-07 08:31:10 -07:00
dma-mapping: replace all DMA_32BIT_MASK macro with DMA_BIT_MASK(32)
2009-04-07 08:31:11 -07:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-rc-fixes-2.6
2009-05-02 16:36:34 -07:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
2009-05-02 16:35:45 -07:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6
2009-04-29 07:55:45 -07:00
leds: just ignore invalid GPIOs in leds-gpio
2009-04-08 14:13:48 +01:00
lguest: fix guest crash on non-linear addresses in gdt pvops
2009-04-19 23:14:01 +09:30
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
Merge branch 'for-linus' of git://neil.brown.name/md
2009-04-20 08:37:37 -07:00
V4L/DVB (11652): au0828: fix kernel oops regression on USB disconnect.
2009-04-29 16:02:51 -03:00
dma-mapping: replace all DMA_32BIT_MASK macro with DMA_BIT_MASK(32)
2009-04-07 08:31:11 -07:00
scsi: mpt: suppress debugobjects warning
2009-04-21 13:41:50 -07:00
isl29003: fix resume functionality
2009-05-06 16:36:10 -07:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/drzeus/mmc
2009-05-05 08:23:16 -07:00
cafe_nand: Fix warning
2009-04-24 07:52:08 -07:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6
2009-05-05 08:26:10 -07:00
parport: Fix various uses of parport_pc
2009-04-14 08:48:50 -07:00
parport: Use the PCI IRQ if offered
2009-04-07 08:44:06 -07:00
PCI: only save/restore existent registers in the PCIe capability
2009-04-22 15:59:41 -07:00
[ARM] 5458/1: pcmcia: pxa2xx-sharpsl: check if we do have Scoop config
2009-04-23 23:25:40 +01:00
Merge branch 'sony-laptop' into release
2009-04-24 01:34:52 -04:00
dma-mapping: replace all DMA_24BIT_MASK macro with DMA_BIT_MASK(24)
2009-04-07 08:31:12 -07:00
Merge git://git.infradead.org/battery-2.6
2009-04-08 17:45:02 -07:00
dma-mapping: replace all DMA_32BIT_MASK macro with DMA_BIT_MASK(32)
2009-04-07 08:31:11 -07:00
regulator: Fix default constraints for fixed voltage regulators
2009-04-28 18:58:08 +01:00
rtc-cmos: fix printk output
2009-04-21 13:41:50 -07:00
[SCSI] zfcp: Fix oops when port disappears
2009-04-27 10:07:37 -05:00
sbus: changed ioctls to unlocked
2009-04-14 19:46:19 -07:00
[SCSI] libosd: OSD2r05: on-the-wire changes for latest OSD2 revision 5.
2009-04-27 11:05:49 -05:00
Merge master.kernel.org:/home/rmk/linux-2.6-arm
2009-05-07 10:54:32 -07:00
dma-mapping: replace all DMA_64BIT_MASK macro with DMA_BIT_MASK(64)
2009-04-07 08:31:10 -07:00
spi: pxa2xx: limit reaches -1
2009-04-21 13:41:49 -07:00
go7007: Convert to the new i2c device binding model
2009-04-21 21:47:22 +02:00
UIO: fix specific device driver missing statement for depmod
2009-04-16 16:17:11 -07:00
USB: otg: Fix bug on remove path without transceiver
2009-04-23 14:15:31 -07:00
dma-mapping: replace all DMA_32BIT_MASK macro with DMA_BIT_MASK(32)
2009-04-07 08:31:11 -07:00
Merge master.kernel.org:/home/rmk/linux-2.6-arm
2009-05-07 10:54:32 -07:00
virtio: fix suspend when using virtio_balloon
2009-04-19 23:14:01 +09:30
[ARM] 5460/1: Orion: reduce namespace pollution
2009-04-23 23:25:41 +01:00
[IA64] xen_domu_defconfig: fix build issues/warnings
2009-05-05 11:43:13 -07:00
V4L/DVB (11561a): move media after i2c
2009-04-29 15:41:13 -03:00
8a0a9bd4db