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/interconnect/Kconfig | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) create mode 100644 drivers/interconnect/Kconfig (limited to 'drivers/interconnect/Kconfig') diff --git a/drivers/interconnect/Kconfig b/drivers/interconnect/Kconfig new file mode 100644 index 000000000..882dcb0b4 --- /dev/null +++ b/drivers/interconnect/Kconfig @@ -0,0 +1,39 @@ +# SPDX-License-Identifier: GPL-2.0-only +menuconfig INTERCONNECT + bool "On-Chip Interconnect management support" + help + Support for management of the on-chip interconnects. + + This framework is designed to provide a generic interface for + managing the interconnects in a SoC. + + If unsure, say no. + +if INTERCONNECT + +source "drivers/interconnect/imx/Kconfig" +source "drivers/interconnect/mediatek/Kconfig" +source "drivers/interconnect/qcom/Kconfig" +source "drivers/interconnect/samsung/Kconfig" + +config INTERCONNECT_CLK + tristate + depends on COMMON_CLK + help + Support for wrapping clocks into the interconnect nodes. + +config INTERCONNECT_KUNIT_TEST + tristate "KUnit tests for Interconnect framework" + depends on KUNIT + default KUNIT_ALL_TESTS + help + This builds the KUnit test suite for the generic system interconnect + framework. + + The tests cover the core functionality of the interconnect subsystem, + including provider/consumer APIs, topology management, and bandwidth + aggregation logic. + + If unsure, say N. + +endif -- cgit v1.3.1