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
..
agp	[PATCH] agp-amd64: section mismatches with HOTPLUG=n	2006-12-07 08:39:40 -08:00
drm	Merge branch 'drm-patches' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6	2006-12-09 12:26:37 -08:00
hw_random	[PATCH] allow hwrandom core to be a module	2006-12-07 08:39:39 -08:00
ip2	[PATCH] tty: switch to ktermios	2006-12-08 08:28:57 -08:00
ipmi	[PATCH] struct path: convert ipmi	2006-12-08 08:28:46 -08:00
mwave	IRQ: Maintain regs pointer globally rather than passing to IRQ handlers	2006-10-05 15:10:12 +01:00
pcmcia	[PATCH] tty: switch to ktermios	2006-12-08 08:28:57 -08:00
rio	[PATCH] ioremap balanced with iounmap for drivers/char/rio/rio_linux.c	2006-12-07 08:39:30 -08:00
tpm	[PATCH] Correct misc_register return code handling in several drivers	2006-12-07 08:39:35 -08:00
watchdog	Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm	2006-12-07 15:40:39 -08:00
.gitignore	[MIPS] Remove IT8172-based platforms, ITE 8172G and Globespan IVR support.	2006-10-03 17:59:17 +01:00
amiserial.c	[PATCH] tty: switch to ktermios	2006-12-08 08:28:57 -08:00
applicom.c	IRQ: Maintain regs pointer globally rather than passing to IRQ handlers	2006-10-05 15:10:12 +01:00
applicom.h
briq_panel.c	Remove all inclusions of <linux/config.h>	2006-10-04 03:38:54 -04:00
cd1865.h
ChangeLog
consolemap.c	Remove obsolete #include <linux/config.h>	2006-06-30 19:25:36 +02:00
cp437.uni
cs5535_gpio.c	[PATCH] struct path: convert char-drivers	2006-12-08 08:28:44 -08:00
cyclades.c	[PATCH] Char: cyclades, fix warnings	2006-12-08 08:29:01 -08:00
decserial.c	[PATCH] dz: Fixes to make it work	2006-12-07 08:39:41 -08:00
defkeymap.c_shipped
defkeymap.map
digi1.h	[PATCH] Clean up the old digi support and rescue it	2005-09-07 16:57:20 -07:00
digi.h
digiFep1.h	[PATCH] Clean up the old digi support and rescue it	2005-09-07 16:57:20 -07:00
digiPCI.h
ds1286.c	[PATCH] proper flags type of spin_lock_irqsave()	2006-10-01 00:39:21 -07:00
ds1302.c	[PATCH] make more file_operation structs static	2006-07-03 15:26:59 -07:00
ds1620.c	[PATCH] make more file_operation structs static	2006-07-03 15:26:59 -07:00
dsp56k.c	[PATCH] struct path: convert char-drivers	2006-12-08 08:28:44 -08:00
dtlk.c	[PATCH] struct path: convert char-drivers	2006-12-08 08:28:44 -08:00
ec3104_keyb.c	IRQ: Maintain regs pointer globally rather than passing to IRQ handlers	2006-10-05 15:10:12 +01:00
efirtc.c	[PATCH] make more file_operation structs static	2006-07-03 15:26:59 -07:00
epca.c	[PATCH] tty: switch to ktermios	2006-12-08 08:28:57 -08:00
epca.h	[PATCH] char: kill unneeded memsets	2006-10-04 07:55:13 -07:00
epcaconfig.h
esp.c	[PATCH] tty: switch to ktermios	2006-12-08 08:28:57 -08:00
generic_nvram.c	[PATCH] powerpc: Kill _machine and hard-coded platform numbers	2006-03-28 23:15:54 +11:00
generic_serial.c	[PATCH] tty: switch to ktermios	2006-12-08 08:28:57 -08:00
genrtc.c	WorkStruct: make allyesconfig	2006-11-22 14:57:56 +00:00
hangcheck-timer.c	IRQ: Maintain regs pointer globally rather than passing to IRQ handlers	2006-10-05 15:10:12 +01:00
hpet.c	[PATCH] severing poll.h -> mm.h	2006-12-04 02:00:36 -05:00
hvc_console.c	[PATCH] Add include/linux/freezer.h and move definitions from sched.h	2006-12-07 08:39:27 -08:00
hvc_console.h	[POWERPC] Make the hvc_console output buffer size settable	2006-07-13 18:53:32 +10:00
hvc_iseries.c	Merge branch 'master' of git://oak/home/sfr/kernels/iseries/work	2006-10-04 15:02:27 +10:00
hvc_rtas.c	[POWERPC] Make the hvc_console output buffer size settable	2006-07-13 18:53:32 +10:00
hvc_vio.c	[POWERPC] The two vio HVC backends clash	2006-09-25 13:30:51 +10:00
hvcs.c	[PATCH] tty: switch to ktermios	2006-12-08 08:28:57 -08:00
hvsi.c	[PATCH] tty: switch to ktermios	2006-12-08 08:28:57 -08:00
i8k.c	[PATCH] make more file_operation structs static	2006-07-03 15:26:59 -07:00
ip27-rtc.c	[PATCH] make more file_operation structs static	2006-07-03 15:26:59 -07:00
isicom.c	[PATCH] Char: isicom, fix tty index check	2006-12-08 08:28:58 -08:00
istallion.c	[PATCH] Char: istallion, use mod_timer	2006-12-08 08:29:00 -08:00
Kconfig	[PATCH] mxser: make an experimental clone	2006-12-08 08:28:53 -08:00
keyboard.c	Input: drivers/char/keyboard.c - small cleanup in k_cur()	2006-11-04 22:09:08 -05:00
lcd.c	[PATCH] make more file_operation structs static	2006-07-03 15:26:59 -07:00
lcd.h	Resurrect Cobalt support for 2.6.	2005-10-29 19:30:42 +01:00
lp.c	[PATCH] struct path: convert char-drivers	2006-12-08 08:28:44 -08:00
Makefile	[PATCH] mxser: make an experimental clone	2006-12-08 08:28:53 -08:00
mbcs.c	IRQ: Maintain regs pointer globally rather than passing to IRQ handlers	2006-10-05 15:10:12 +01:00
mbcs.h
mem.c	[PATCH] read_zero_pagealigned() locking fix	2006-12-10 09:55:39 -08:00
misc.c	[PATCH] Correct misc_register return code handling in several drivers	2006-12-07 08:39:35 -08:00
mmtimer.c	[PATCH] Correct misc_register return code handling in several drivers	2006-12-07 08:39:35 -08:00
moxa.c	[PATCH] tty: switch to ktermios	2006-12-08 08:28:57 -08:00
mspec.c	[PATCH] mspec driver build fix	2006-11-13 07:40:42 -08:00
mxser_new.c	[PATCH] tty: switch to ktermios	2006-12-08 08:28:57 -08:00
mxser_new.h	[PATCH] Char: mxser_new, rework to allow dynamic structs	2006-12-08 08:28:53 -08:00
mxser.c	[PATCH] tty: switch to ktermios	2006-12-08 08:28:57 -08:00
mxser.h	[PATCH] Typo fixes	2006-03-28 09:16:08 -08:00
n_hdlc.c	Remove obsolete #include <linux/config.h>	2006-06-30 19:25:36 +02:00
n_r3964.c	[PATCH] tty: switch to ktermios	2006-12-08 08:28:57 -08:00
n_tty.c	[PATCH] tty: switch to ktermios	2006-12-08 08:28:57 -08:00
nsc_gpio.c	[PATCH] struct path: convert char-drivers	2006-12-08 08:28:44 -08:00
nvram.c	[PATCH] make more file_operation structs static	2006-07-03 15:26:59 -07:00
nwbutton.c	IRQ: Maintain regs pointer globally rather than passing to IRQ handlers	2006-10-05 15:10:12 +01:00
nwbutton.h	IRQ: Maintain regs pointer globally rather than passing to IRQ handlers	2006-10-05 15:10:12 +01:00
nwflash.c	[PATCH] make more file_operation structs static	2006-07-03 15:26:59 -07:00
pc8736x_gpio.c	[PATCH] drivers/char/pc8736x_gpio.c: remove unused static functions	2006-09-29 09:18:05 -07:00
ppdev.c	[PATCH] struct path: convert char-drivers	2006-12-08 08:28:44 -08:00
pty.c	[PATCH] tty: switch to ktermios	2006-12-08 08:28:57 -08:00
random.c	[PATCH] struct path: convert char-drivers	2006-12-08 08:28:44 -08:00
raw.c	[PATCH] struct path: convert char-drivers	2006-12-08 08:28:44 -08:00
riscom8_reg.h
riscom8.c	[PATCH] tty: switch to ktermios	2006-12-08 08:28:57 -08:00
riscom8.h
rocket_int.h
rocket.c	[PATCH] tty: switch to ktermios	2006-12-08 08:28:57 -08:00
rocket.h
rtc.c	[RTC] Consistently use of tabs for formatting.	2006-10-09 23:20:47 +01:00
scan_keyb.c
scan_keyb.h
scc.h	[PATCH] m68k: static vs. extern in scc.h	2006-01-12 09:09:00 -08:00
scx200_gpio.c	[PATCH] scx200_gpio export cleanups	2006-09-29 09:18:06 -07:00
selection.c	[PATCH] tty locking on resize	2006-09-29 09:18:12 -07:00
ser_a2232.c	[PATCH] tty: switch to ktermios	2006-12-08 08:28:57 -08:00
ser_a2232.h
ser_a2232fw.ax
ser_a2232fw.h
serial167.c	[PATCH] tty: switch to ktermios	2006-12-08 08:28:57 -08:00
snsc_event.c	IRQ: Maintain regs pointer globally rather than passing to IRQ handlers	2006-10-05 15:10:12 +01:00
snsc.c	IRQ: Maintain regs pointer globally rather than passing to IRQ handlers	2006-10-05 15:10:12 +01:00
snsc.h	[IA64-SGI] Handle SC env. powerdown events	2006-01-26 13:32:26 -08:00
sonypi.c	[PATCH] struct path: convert char-drivers	2006-12-08 08:28:44 -08:00
specialix_io8.h
specialix.c	[PATCH] tty: switch to ktermios	2006-12-08 08:28:57 -08:00
stallion.c	[PATCH] Char: stallion, use dynamic dev	2006-12-08 08:28:59 -08:00
sx.c	[PATCH] Char: sx, request regions	2006-12-08 08:28:59 -08:00
sx.h	[PATCH] Char: sx, request regions	2006-12-08 08:28:59 -08:00
sxboards.h
sxwindow.h
synclink_gt.c	[PATCH] tty: switch to ktermios	2006-12-08 08:28:57 -08:00
synclink.c	[PATCH] tty: switch to ktermios	2006-12-08 08:28:57 -08:00
synclinkmp.c	[PATCH] tty: switch to ktermios	2006-12-08 08:28:57 -08:00
sysrq.c	[PATCH] SysRq-X: show blocked tasks	2006-12-07 08:39:32 -08:00
tb0219.c	[PATCH] struct path: convert char-drivers	2006-12-08 08:28:44 -08:00
tipar.c	[PATCH] struct path: convert char-drivers	2006-12-08 08:28:44 -08:00
tlclk.c	[PATCH] tlclk: fix platform_device_register_simple() error check	2006-11-25 13:28:34 -08:00
toshiba.c	[PATCH] export toshiba SMM support for neofb module	2006-12-07 08:39:40 -08:00
tty_io.c	[PATCH] tty: switch to ktermios and new framework	2006-12-08 08:28:56 -08:00
tty_ioctl.c	[PATCH] tty_ioctl: use termios for the old structure and termios2 for the new	2006-12-08 08:28:57 -08:00
vc_screen.c	[PATCH] struct path: convert char-drivers	2006-12-08 08:28:44 -08:00
viocons.c	[POWERPC] Fix viocons for irq breakage	2006-10-07 10:10:27 +10:00
viotape.c	[PATCH] struct path: convert char-drivers	2006-12-08 08:28:44 -08:00
vme_scc.c	[PATCH] tty: switch to ktermios	2006-12-08 08:28:57 -08:00
vr41xx_giu.c	[PATCH] struct path: convert char-drivers	2006-12-08 08:28:44 -08:00
vt_ioctl.c	[PATCH] vt: Make vt_pid a struct pid (making it pid wrap around safe).	2006-10-02 07:57:14 -07:00
vt.c	[PATCH] add return value checking of get_user() in set_vesa_blanking()	2006-12-07 08:39:40 -08:00