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/pinctrl/sunplus/Kconfig | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) create mode 100644 drivers/pinctrl/sunplus/Kconfig (limited to 'drivers/pinctrl/sunplus/Kconfig') diff --git a/drivers/pinctrl/sunplus/Kconfig b/drivers/pinctrl/sunplus/Kconfig new file mode 100644 index 000000000..69f82590f --- /dev/null +++ b/drivers/pinctrl/sunplus/Kconfig @@ -0,0 +1,21 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Sunplus Pin control driver configuration +# + +config PINCTRL_SPPCTL + tristate "Sunplus SP7021 PinMux and GPIO driver" + depends on SOC_SP7021 + depends on OF && HAS_IOMEM + select GENERIC_PINCTRL_GROUPS + select GENERIC_PINMUX_FUNCTIONS + select GENERIC_PINCONF + select PINCONF + select PINMUX + select GPIOLIB + help + Say Y here to support Sunplus SP7021 pinmux controller. + This driver requires the pinctrl framework. + GPIO is provided by the same driver. + To compile this driver as a module, choose M here. + The module will be called sppinctrl. -- cgit v1.3.1