ARM: 9485/1: mm: acquire mmap write lock around show_pte() for user faultsgrafted

When CONFIG_DEBUG_USER=y, and cmdline "user_debug=31" is set,
a user fault may trigger show_pte() without any lock.
If another thread in the same process concurrently calls munmap(),
the page table pages may be freed while show_pte() is still traversing
them, causing a use-after-free in show_pte().

If CONFIG_ARM_LPAE=y, this may cause a kernel panic if the pages table
of PMD are freed when show_pte() is running.

Acquire mmap_write_lock() around show_pte() for user faults to fix the
contention.

For user faults, additionally restrict that show_pte() is called only
when the addr is a user-space address (addr < TASK_SIZE). This is because
the lock of tsk->mm only protects the virtual memory of user address space,
furthermore, dumping the page tables of a kernel-space address for user
faults is unnecessary and may have security implications.

Keep everything unchanged for kernel faults, because the kernel is
already in the "oops" state, acquiring a lock may risk a deadlock.

Co-developed-by: Qi Xi <xiqi2@huawei.com>

Fixes: 6d021b724481 ("ARM: dump pgd, pmd and pte states on unhandled data abort faults")
Link: https://lore.kernel.org/20260716014022.2823-1-xieyuanbin1@huawei.com
Acked-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
Reviewed-by: Linus Walleij <linusw@kernel.org>
Signed-off-by: Qi Xi <xiqi2@huawei.com>
Signed-off-by: Xie Yuanbin <xieyuanbin1@huawei.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

1 files changed, 73 insertions, 0 deletions

diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
new file mode 100644
index 000000000..60bb7baf8
--- /dev/null
+++ b/drivers/input/keyboard/Makefile
@@ -0,0 +1,73 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the input core drivers.
+#
+
+# Each configuration option enables a list of files.
+
+obj-$(CONFIG_KEYBOARD_ADC)		+= adc-keys.o
+obj-$(CONFIG_KEYBOARD_ADP5520)		+= adp5520-keys.o
+obj-$(CONFIG_KEYBOARD_ADP5585)		+= adp5585-keys.o
+obj-$(CONFIG_KEYBOARD_ADP5588)		+= adp5588-keys.o
+obj-$(CONFIG_KEYBOARD_AMIGA)		+= amikbd.o
+obj-$(CONFIG_KEYBOARD_APPLESPI)		+= applespi.o
+obj-$(CONFIG_KEYBOARD_ATARI)		+= atakbd.o
+obj-$(CONFIG_KEYBOARD_ATKBD)		+= atkbd.o
+obj-$(CONFIG_KEYBOARD_BCM)		+= bcm-keypad.o
+obj-$(CONFIG_KEYBOARD_CAP11XX)		+= cap11xx.o
+obj-$(CONFIG_KEYBOARD_CHARLIEPLEX)	+= charlieplex_keypad.o
+obj-$(CONFIG_KEYBOARD_CLPS711X)		+= clps711x-keypad.o
+obj-$(CONFIG_KEYBOARD_CROS_EC)		+= cros_ec_keyb.o
+obj-$(CONFIG_KEYBOARD_CYPRESS_SF)	+= cypress-sf.o
+obj-$(CONFIG_KEYBOARD_DLINK_DIR685)	+= dlink-dir685-touchkeys.o
+obj-$(CONFIG_KEYBOARD_EP93XX)		+= ep93xx_keypad.o
+obj-$(CONFIG_KEYBOARD_GOLDFISH_EVENTS)	+= goldfish_events.o
+obj-$(CONFIG_KEYBOARD_GPIO)		+= gpio_keys.o
+obj-$(CONFIG_KEYBOARD_GPIO_POLLED)	+= gpio_keys_polled.o
+obj-$(CONFIG_KEYBOARD_TCA8418)		+= tca8418_keypad.o
+obj-$(CONFIG_KEYBOARD_HIL)		+= hil_kbd.o
+obj-$(CONFIG_KEYBOARD_HIL_OLD)		+= hilkbd.o
+obj-$(CONFIG_KEYBOARD_IPAQ_MICRO)	+= ipaq-micro-keys.o
+obj-$(CONFIG_KEYBOARD_IQS62X)		+= iqs62x-keys.o
+obj-$(CONFIG_KEYBOARD_IMX)		+= imx_keypad.o
+obj-$(CONFIG_KEYBOARD_IMX_SC_KEY)	+= imx_sc_key.o
+obj-$(CONFIG_KEYBOARD_IMX_BBM_SCMI)	+= imx-sm-bbm-key.o
+obj-$(CONFIG_KEYBOARD_HP6XX)		+= jornada680_kbd.o
+obj-$(CONFIG_KEYBOARD_HP7XX)		+= jornada720_kbd.o
+obj-$(CONFIG_KEYBOARD_LKKBD)		+= lkkbd.o
+obj-$(CONFIG_KEYBOARD_LM8323)		+= lm8323.o
+obj-$(CONFIG_KEYBOARD_LM8333)		+= lm8333.o
+obj-$(CONFIG_KEYBOARD_LOCOMO)		+= locomokbd.o
+obj-$(CONFIG_KEYBOARD_LPC32XX)		+= lpc32xx-keys.o
+obj-$(CONFIG_KEYBOARD_MAPLE)		+= maple_keyb.o
+obj-$(CONFIG_KEYBOARD_MATRIX)		+= matrix_keypad.o
+obj-$(CONFIG_KEYBOARD_MAX7359)		+= max7359_keypad.o
+obj-$(CONFIG_KEYBOARD_MAX7360)		+= max7360-keypad.o
+obj-$(CONFIG_KEYBOARD_MPR121)		+= mpr121_touchkey.o
+obj-$(CONFIG_KEYBOARD_MT6779)		+= mt6779-keypad.o
+obj-$(CONFIG_KEYBOARD_MTK_PMIC) 	+= mtk-pmic-keys.o
+obj-$(CONFIG_KEYBOARD_NEWTON)		+= newtonkbd.o
+obj-$(CONFIG_KEYBOARD_NSPIRE)		+= nspire-keypad.o
+obj-$(CONFIG_KEYBOARD_OMAP)		+= omap-keypad.o
+obj-$(CONFIG_KEYBOARD_OMAP4)		+= omap4-keypad.o
+obj-$(CONFIG_KEYBOARD_OPENCORES)	+= opencores-kbd.o
+obj-$(CONFIG_KEYBOARD_PINEPHONE)	+= pinephone-keyboard.o
+obj-$(CONFIG_KEYBOARD_PMIC8XXX)		+= pmic8xxx-keypad.o
+obj-$(CONFIG_KEYBOARD_PXA27x)		+= pxa27x_keypad.o
+obj-$(CONFIG_KEYBOARD_QT1050)           += qt1050.o
+obj-$(CONFIG_KEYBOARD_QT1070)           += qt1070.o
+obj-$(CONFIG_KEYBOARD_QT2160)		+= qt2160.o
+obj-$(CONFIG_KEYBOARD_SAMSUNG)		+= samsung-keypad.o
+obj-$(CONFIG_KEYBOARD_SH_KEYSC)		+= sh_keysc.o
+obj-$(CONFIG_KEYBOARD_SNVS_PWRKEY)	+= snvs_pwrkey.o
+obj-$(CONFIG_KEYBOARD_SPEAR)		+= spear-keyboard.o
+obj-$(CONFIG_KEYBOARD_STMPE)		+= stmpe-keypad.o
+obj-$(CONFIG_KEYBOARD_STOWAWAY)		+= stowaway.o
+obj-$(CONFIG_KEYBOARD_ST_KEYSCAN)	+= st-keyscan.o
+obj-$(CONFIG_KEYBOARD_SUN4I_LRADC)	+= sun4i-lradc-keys.o
+obj-$(CONFIG_KEYBOARD_SUNKBD)		+= sunkbd.o
+obj-$(CONFIG_KEYBOARD_TC3589X)		+= tc3589x-keypad.o
+obj-$(CONFIG_KEYBOARD_TEGRA)		+= tegra-kbc.o
+obj-$(CONFIG_KEYBOARD_TM2_TOUCHKEY)	+= tm2-touchkey.o
+obj-$(CONFIG_KEYBOARD_TWL4030)		+= twl4030_keypad.o
+obj-$(CONFIG_KEYBOARD_XTKBD)		+= xtkbd.o