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![]() Add a copy_to_user() call to the ACCESS_USERSPACE test prior to attempting direct dereferencing of the user address to ensure the page is present. Otherwise, a fault occurs on arm kernels even prior to the introduction of CONFIG_CPU_SW_DOMAIN_PAN, and there is no difference in behavior for CONFIG_CPU_SW_DOMAIN_PAN=n vs CONFIG_CPU_SW_DOMAIN_PAN=y. Before this change, for any value of CONFIG_CPU_SW_DOMAIN_PAN: lkdtm: Performing direct entry ACCESS_USERSPACE lkdtm: attempting bad read at b6fe8000 Unable to handle kernel paging request at virtual address b6fe8000 After this change, for CONFIG_CPU_SW_DOMAIN_PAN=n: lkdtm: Performing direct entry ACCESS_USERSPACE lkdtm: attempting bad read at b6efc000 lkdtm: attempting bad write at b6efc000 After this change, for CONFIG_CPU_SW_DOMAIN_PAN=y: lkdtm: Performing direct entry ACCESS_USERSPACE lkdtm: attempting bad read at b6f7d000 Unhandled fault: page domain fault (0x01b) at 0xb6f7d000 ... Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov> Acked-by: Kees Cook <keescook@chromium.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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altera-stapl | ||
c2port | ||
cb710 | ||
cxl | ||
echo | ||
eeprom | ||
genwqe | ||
ibmasm | ||
lis3lv02d | ||
mei | ||
mic | ||
sgi-gru | ||
sgi-xp | ||
ti-st | ||
vmw_vmci | ||
ad525x_dpot-i2c.c | ||
ad525x_dpot-spi.c | ||
ad525x_dpot.c | ||
ad525x_dpot.h | ||
apds990x.c | ||
apds9802als.c | ||
arm-charlcd.c | ||
atmel-ssc.c | ||
atmel_tclib.c | ||
bh1770glc.c | ||
bh1780gli.c | ||
bmp085-i2c.c | ||
bmp085-spi.c | ||
bmp085.c | ||
bmp085.h | ||
cs5535-mfgpt.c | ||
ds1682.c | ||
dummy-irq.c | ||
enclosure.c | ||
fsa9480.c | ||
hmc6352.c | ||
hpilo.c | ||
hpilo.h | ||
ics932s401.c | ||
ioc4.c | ||
isl29003.c | ||
isl29020.c | ||
Kconfig | ||
kgdbts.c | ||
lattice-ecp3-config.c | ||
lkdtm.c | ||
Makefile | ||
pch_phub.c | ||
phantom.c | ||
pti.c | ||
qcom-coincell.c | ||
spear13xx_pcie_gadget.c | ||
sram.c | ||
ti_dac7512.c | ||
tifm_7xx1.c | ||
tifm_core.c | ||
tsl2550.c | ||
vexpress-syscfg.c | ||
vmw_balloon.c |