From 78004e9a87f240df03e2f73120d291763c32e0a7 Mon Sep 17 00:00:00 2001 From: Ali Ahmet Memis Date: Fri, 21 Aug 2026 01:45:27 +0000 Subject: openrisc: fix arbitrary kernel memory access via or1k_atomic syscall sys_or1k_atomic() (syscall 244 in the "or1k" ABI) takes two user pointers, v1 and v2, and swaps the words they point to in hand-written assembly. l.lwz r29,0(r4) l.lwz r27,0(r5) l.sw 0(r4),r27 l.sw 0(r5),r29 The pointers are not checked with access_ok(). The four memory accesses also have no exception table entries. A caller passes a kernel address as either pointer, and the syscall reads from and writes to it directly. This gives an unprivileged process a kernel read/write primitive. It overwrites kernel data such as the sys_call_table, gaining code execution in kernel context. Check both pointers before entering the critical section. Add fixups for the four memory accesses so faults on valid but unmapped user addresses return -EFAULT. [shorne@gmail.com: fix comment style] Fixes: 9d02a4283e9c ("OpenRISC: Boot code") Cc: stable@vger.kernel.org Signed-off-by: Ali Ahmet Memis Signed-off-by: Stafford Horne --- drivers/input/rmi4/Makefile | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) create mode 100644 drivers/input/rmi4/Makefile (limited to 'drivers/input/rmi4/Makefile') diff --git a/drivers/input/rmi4/Makefile b/drivers/input/rmi4/Makefile new file mode 100644 index 000000000..35ae29f72 --- /dev/null +++ b/drivers/input/rmi4/Makefile @@ -0,0 +1,22 @@ +# SPDX-License-Identifier: GPL-2.0 +obj-$(CONFIG_RMI4_CORE) += rmi_core.o +rmi_core-y := rmi_bus.o rmi_driver.o rmi_f01.o + +rmi_core-$(CONFIG_RMI4_2D_SENSOR) += rmi_2d_sensor.o + +# Function drivers +rmi_core-$(CONFIG_RMI4_F03) += rmi_f03.o +rmi_core-$(CONFIG_RMI4_F11) += rmi_f11.o +rmi_core-$(CONFIG_RMI4_F12) += rmi_f12.o +rmi_core-$(CONFIG_RMI4_F1A) += rmi_f1a.o +rmi_core-$(CONFIG_RMI4_F21) += rmi_f21.o +rmi_core-$(CONFIG_RMI4_F30) += rmi_f30.o +rmi_core-$(CONFIG_RMI4_F34) += rmi_f34.o rmi_f34v7.o +rmi_core-$(CONFIG_RMI4_F3A) += rmi_f3a.o +rmi_core-$(CONFIG_RMI4_F54) += rmi_f54.o +rmi_core-$(CONFIG_RMI4_F55) += rmi_f55.o + +# Transports +obj-$(CONFIG_RMI4_I2C) += rmi_i2c.o +obj-$(CONFIG_RMI4_SPI) += rmi_spi.o +obj-$(CONFIG_RMI4_SMB) += rmi_smbus.o -- cgit v1.3.1