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/clk/versatile/Kconfig | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) create mode 100644 drivers/clk/versatile/Kconfig (limited to 'drivers/clk/versatile/Kconfig') diff --git a/drivers/clk/versatile/Kconfig b/drivers/clk/versatile/Kconfig new file mode 100644 index 000000000..403f16495 --- /dev/null +++ b/drivers/clk/versatile/Kconfig @@ -0,0 +1,32 @@ +# SPDX-License-Identifier: GPL-2.0-only + +menu "Clock driver for ARM Reference designs" + depends on HAS_IOMEM + depends on ARM || ARM64 || COMPILE_TEST + +config CLK_ICST + bool "Clock driver for ARM Reference designs ICST" + select REGMAP_MMIO + help + Supports clocking on ARM Reference designs: + - Integrator/AP and Integrator/CP + - RealView PB1176, EB, PB11MP and PBX + +config CLK_SP810 + bool "Clock driver for ARM SP810 System Controller" + default y if (ARCH_VEXPRESS && ARM) + help + Supports clock muxing (REFCLK/TIMCLK to TIMERCLKEN0-3) capabilities + of the ARM SP810 System Controller cell. + +config CLK_VEXPRESS_OSC + tristate "Clock driver for Versatile Express OSC clock generators" + depends on VEXPRESS_CONFIG + select REGMAP_MMIO + default y if ARCH_VEXPRESS + help + Simple regmap-based driver driving clock generators on Versatile + Express platforms hidden behind its configuration infrastructure, + commonly known as OSCs. + +endmenu -- cgit v1.3.1