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