Hugh Dickins 5fcf7bb73f [PATCH] read_zero_pagealigned() locking fix ... Ramiro Voicu hits the BUG_ON(!pte_none(*pte)) in zeromap_pte_range: kernel bugzilla 7645. Right: read_zero_pagealigned uses down_read of mmap_sem, but another thread's racing read of /dev/zero, or a normal fault, can easily set that pte again, in between zap_page_range and zeromap_page_range getting there. It's been wrong ever since 2.4.3. The simple fix is to use down_write instead, but that would serialize reads of /dev/zero more than at present: perhaps some app would be badly affected. So instead let zeromap_page_range return the error instead of BUG_ON, and read_zero_pagealigned break to the slower clear_user loop in that case - there's no need to optimize for it. Use -EEXIST for when a pte is found: BUG_ON in mmap_zero (the other user of zeromap_page_range), though it really isn't interesting there. And since mmap_zero wants -EAGAIN for out-of-memory, the zeromaps better return that than -ENOMEM. Signed-off-by: Hugh Dickins <hugh@veritas.com> Cc: Ramiro Voicu: <Ramiro.Voicu@cern.ch> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>		2006-12-10 09:55:39 -08:00
..
acorn	IRQ: Maintain regs pointer globally rather than passing to IRQ handlers	2006-10-05 15:10:12 +01:00
acpi	Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6	2006-12-05 17:01:28 +00:00
amba	[ARM] Fix __must_check warnings in drivers/bus/amba.c	2006-11-30 14:04:49 +00:00
ata	[PATCH] libata: Incorrect timing computation for PIO5/6	2006-12-07 07:37:07 -05:00
atm	[PATCH] atm/ambassador: use bitrev8	2006-12-08 08:28:40 -08:00
base	Merge branch 'for-linus' of git://one.firstfloor.org/home/andi/git/linux-2.6	2006-12-07 08:59:11 -08:00
block	[PATCH] struct path: convert nbd	2006-12-08 08:28:47 -08:00
bluetooth	[PATCH] lockdep: annotate bcsp driver	2006-12-07 08:39:34 -08:00
cdrom	[PATCH] drivers/cdrom/*: trivial vsnprintf() conversion	2006-12-07 08:39:35 -08:00
char	[PATCH] read_zero_pagealigned() locking fix	2006-12-10 09:55:39 -08:00
clocksource	[PATCH] time: re-add verify_pmtmr_rate	2006-12-08 08:28:37 -08:00
connector	WorkStruct: make allyesconfig	2006-11-22 14:57:56 +00:00
cpufreq	[PATCH] hotplug CPU: clean up hotcpu_notifier() use	2006-12-07 08:39:39 -08:00
crypto	[CRYPTO] geode: Make needlessly global geode_aes_crypt() static	2006-12-06 18:38:53 -08:00
dio
dma	[PATCH] slab: remove SLAB_KERNEL	2006-12-07 08:39:24 -08:00
edac	[PATCH] Add include/linux/freezer.h and move definitions from sched.h	2006-12-07 08:39:27 -08:00
eisa	[PATCH] EISA: handle sysfs errors	2006-10-11 11:14:25 -07:00
fc4	[SCSI] fc4: Conversion to struct scsi_cmnd in fc4	2006-10-25 15:12:45 -07:00
firmware	[PATCH] dell_rbu: fix error check	2006-11-16 11:43:38 -08:00
hid	[PATCH] Generic HID layer - build	2006-12-08 10:43:20 -08:00
hwmon	[PATCH] severing fs.h, radix-tree.h -> sched.h	2006-12-04 02:00:24 -05:00
i2c	[PATCH] struct path: convert i2c-drivers	2006-12-08 08:28:45 -08:00
ide	[PATCH] sl82c105: straighten up IDE control/status register caching	2006-12-08 08:29:03 -08:00
ieee1394	[PATCH] struct path: convert ieee1394	2006-12-08 08:28:46 -08:00
infiniband	[PATCH] LOG2: Implement a general integer log2 facility in the kernel	2006-12-08 08:28:51 -08:00
input	[PATCH] ucb1400_ts depends SND_AC97_BUS	2006-12-10 09:55:39 -08:00
isdn	[PATCH] ISDN: fix warnings	2006-12-08 08:29:01 -08:00
leds	[PATCH] PCEngines WRAP LED Support	2006-12-07 08:39:36 -08:00
macintosh	Merge rsync://rsync.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6	2006-12-08 01:07:56 -05:00
mca	[PATCH] drivers/mca: handle sysfs errors	2006-10-11 11:14:25 -07:00
md	[PATCH] make drivers/md/dm-snap.c:ksnapd static	2006-12-08 08:29:09 -08:00
media	[PATCH] struct path: convert v4l	2006-12-08 08:28:50 -08:00
message	[PATCH] kernel-doc: fix fusion and i2o docs	2006-12-07 08:39:40 -08:00
mfd	[PATCH] Add include/linux/freezer.h and move definitions from sched.h	2006-12-07 08:39:27 -08:00
misc	[PATCH] tifm: fix NULL ptr and style	2006-12-07 08:39:33 -08:00
mmc	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/drzeus/mmc	2006-12-08 08:47:07 -08:00
mtd	[PATCH] slab: remove SLAB_KERNEL	2006-12-07 08:39:24 -08:00
net	[PATCH] Amiga PCMCIA NE2000 Ethernet dev->irq init	2006-12-09 09:41:18 -08:00
nubus
oprofile	[PATCH] struct path: convert oprofile	2006-12-08 08:28:48 -08:00
parisc	Fix misc .c/.h comment typos	2006-11-30 05:24:39 +01:00
parport	[PATCH] Kconfig refactoring for better menu nesting	2006-12-10 09:55:39 -08:00
pci	[PATCH] Kconfig refactoring for better menu nesting	2006-12-10 09:55:39 -08:00
pcmcia	[PATCH] struct path: convert pcmcia	2006-12-08 08:28:48 -08:00
pnp	[PATCH] struct path: convert isapnp	2006-12-08 08:28:46 -08:00
ps3	[POWERPC] ps3: multiplatform build fixes	2006-12-04 20:41:16 +11:00
rapidio
rtc	[PATCH] rtc: ds1743 support	2006-12-07 08:39:43 -08:00
s390	Merge branch 'for-linus' of git://git390.osdl.marist.edu/pub/scm/linux-2.6	2006-12-08 11:21:55 -08:00
sbus	[PATCH] struct path: convert sbus	2006-12-08 08:28:49 -08:00
scsi	[PATCH] Sun3 SCSI: Make sun3 scsi drivers compile/work again	2006-12-09 09:41:18 -08:00
serial	[PATCH] Kconfig refactoring for better menu nesting	2006-12-10 09:55:39 -08:00
sh
sn	[PATCH] ioc4: Enable build on non-SN2	2006-10-17 08:18:42 -07:00
spi	[PATCH] spi: check platform_device_register_simple() error	2006-12-07 08:39:42 -08:00
tc	[PATCH] tty: switch to ktermios	2006-12-08 08:28:57 -08:00
telephony	[PATCH] struct path: convert ixj	2006-12-08 08:28:46 -08:00
usb	[PATCH] Generic HID layer - build	2006-12-08 10:43:20 -08:00
video	[PATCH] video: neofb stray bracket fix	2006-12-08 08:29:08 -08:00
w1	[PATCH] better CONFIG_W1_SLAVE_DS2433_CRC handling	2006-12-07 08:39:43 -08:00
zorro	[PATCH] struct path: convert zorro	2006-12-08 08:28:50 -08:00
Kconfig	[PATCH] Generic HID layer - build	2006-12-08 10:43:20 -08:00
Makefile	[PATCH] Generic HID layer - build	2006-12-08 10:43:20 -08:00