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3b1dbfa14f
linux/drivers/misc
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Aneesh Kumar K.V 3b1dbfa14f cxl: Fix DAR check & use REGION_ID instead of opencoding 
The current code will set _PAGE_USER to the access flags for any
fault address, because the ~ operation will be true for all address we
take a fault on. But setting _PAGE_USER also means that the fault will
be handled only if the page table have _PAGE_USER set. Hence there is
no security hole with the current code.

Now if it is an user space access, then the change in this patch really
don't have an impact because we have (!ctx->kernel) set true
and we take the if condition true.

Now kernel context created fault on an address in the kernel range
will result in a fault loop because we will not insert the
hash pte due to access and pte permission mismatch. This patch fix
the above issue.

Fixes: f204e0b8ce ("cxl: Driver code for powernv PCIe based cards for userspace access")
Reviewed-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Acked-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2016-04-26 21:06:36 +10:00
..
altera-stapl drivers/misc/altera-stapl/altera.c: remove extraneous KERN_INFO prefix 2015-06-25 17:00:38 -07:00
c2port misc: c2port: use kobj_to_dev() 2016-02-07 23:01:45 -08:00
cb710
cxl cxl: Fix DAR check & use REGION_ID instead of opencoding 2016-04-26 21:06:36 +10:00
echo
eeprom misc: at24: replace memory_accessor with nvmem_device_read 2016-03-01 16:55:48 -08:00
genwqe GenWQE: use kobj_to_dev() 2016-02-08 14:57:30 -08:00
ibmasm mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros 2016-04-04 10:41:08 -07:00
lis3lv02d misc: apds990x, bh1770glc, lis3lv02d: use to_i2c_client 2016-02-07 23:01:45 -08:00
mei mei: me: add broxton pci device ids 2016-03-01 16:53:32 -08:00
mic Merge branch 'mm-pkeys-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-03-20 19:08:56 -07:00
sgi-gru mm/gup: Switch all callers of get_user_pages() to not pass tsk/mm 2016-02-16 10:11:12 +01:00
sgi-xp mm: rename alloc_pages_exact_node() to __alloc_pages_node() 2015-09-08 15:35:28 -07:00
ti-st misc: st_core: remove unreachable code 2016-02-07 23:01:45 -08:00
vmw_vmci mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros 2016-04-04 10:41:08 -07:00
ad525x_dpot-i2c.c misc: ad525x_dpot: Remove unnecessary MODULE_ALIAS() 2015-09-20 19:33:29 -07:00
ad525x_dpot-spi.c spi: Drop owner assignment from spi_drivers 2015-10-28 10:30:17 +09:00
ad525x_dpot.c misc: ad525x_dpot: Fix the enabling of the "otpXen" attributes 2016-03-01 16:55:13 -08:00
ad525x_dpot.h
apds990x.c misc: apds990x, bh1770glc, lis3lv02d: use to_i2c_client 2016-02-07 23:01:45 -08:00
apds9802als.c
arm-charlcd.c drivers/misc: make arm-charlcd.c explicitly non-modular 2016-02-07 23:01:45 -08:00
atmel_tclib.c misc: atmel_tclib: get and use slow clock 2015-10-06 12:33:14 +02:00
atmel-ssc.c ASoC: atmel_ssc_dai: distinguish the different SSC 2016-03-02 23:43:11 +09:00
bh1770glc.c misc: apds990x, bh1770glc, lis3lv02d: use to_i2c_client 2016-02-07 23:01:45 -08:00
bh1780gli.c misc: bh1780: Add module aliases 2015-03-16 21:10:28 +01:00
bmp085-i2c.c misc: Drop owner assignment from i2c_driver 2015-08-10 08:37:35 +02:00
bmp085-spi.c spi: Drop owner assignment from spi_drivers 2015-10-28 10:30:17 +09:00
bmp085.c
bmp085.h
cs5535-mfgpt.c
ds1682.c misc: ds1682: clean up ds1682_eeprom_read() and ds1682_eeprom_write() 2015-08-05 13:53:39 -07:00
dummy-irq.c
enclosure.c enclosure: fix WARN_ON removing an adapter in multi-path devices 2015-03-31 08:53:36 +03:00
fsa9480.c
hmc6352.c
hpilo.c misc: hpilo: Change e-mail address from hp.com to hpe.com 2015-10-04 12:42:33 +01:00
hpilo.h
ics932s401.c
ioc4.c misc: ioc4: simplify wave period measurement in clock_calibrate 2015-01-12 05:04:11 -08:00
isl29003.c misc: Drop owner assignment from i2c_driver 2015-08-10 08:37:35 +02:00
isl29020.c
Kconfig Merge char-misc-next into staging-next 2016-02-22 14:46:24 -08:00
kgdbts.c drivers/misc: make kgdbts.c slightly more explicitly non-modular 2015-09-20 19:32:35 -07:00
lattice-ecp3-config.c spi: Drop owner assignment from spi_drivers 2015-10-28 10:30:17 +09:00
lkdtm.c Char/Misc patches for 4.6-rc1 2016-03-17 13:47:50 -07:00
Makefile misc: Move panel driver out of staging 2016-02-03 14:14:22 -08:00
panel.c misc: panel, convert struct to bitmap 2016-02-11 19:24:23 -08:00
pch_phub.c pch_phub: return -ENODATA if ROM can't be mapped 2016-03-05 12:19:39 -08:00
phantom.c
pti.c
qcom-coincell.c ARM: qcom: Add coincell charger driver 2015-07-29 13:37:18 -07:00
spear13xx_pcie_gadget.c spear13xx_pcie_gadget: use per-attribute show and store methods 2015-10-13 22:17:40 -07:00
sram.c misc: sram: add optional ioremap without write combining 2016-03-14 12:19:45 -04:00
ti_dac7512.c spi: Drop owner assignment from spi_drivers 2015-10-28 10:30:17 +09:00
tifm_7xx1.c misc: tifm: match return type of wait_for_completion_timeout 2015-03-25 11:36:38 +01:00
tifm_core.c
tsl2550.c misc: Drop owner assignment from i2c_driver 2015-08-10 08:37:35 +02:00
vexpress-syscfg.c ARM: vexpress: Remove non-DT code 2014-11-28 16:08:16 +01:00
vmw_balloon.c mm, page_alloc: rename __GFP_WAIT to __GFP_RECLAIM 2015-11-06 17:50:42 -08:00