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/net/pse-pd/Kconfig | 55 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) create mode 100644 drivers/net/pse-pd/Kconfig (limited to 'drivers/net/pse-pd/Kconfig') diff --git a/drivers/net/pse-pd/Kconfig b/drivers/net/pse-pd/Kconfig new file mode 100644 index 000000000..7ef29657e --- /dev/null +++ b/drivers/net/pse-pd/Kconfig @@ -0,0 +1,55 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +# Ethernet Power Sourcing Equipment drivers +# + +menuconfig PSE_CONTROLLER + bool "Ethernet Power Sourcing Equipment Support" + depends on REGULATOR + help + Generic Power Sourcing Equipment Controller support. + + If unsure, say no. + +if PSE_CONTROLLER + +config PSE_REGULATOR + tristate "Regulator based PSE controller" + help + This module provides support for simple regulator based Ethernet Power + Sourcing Equipment without automatic classification support. For + example for basic implementation of PoDL (802.3bu) specification. + +config PSE_PD692X0 + tristate "PD692X0 PSE controller" + depends on I2C + select FW_LOADER + select FW_UPLOAD + help + This module provides support for PD692x0 regulator based Ethernet + Power Sourcing Equipment. + + To compile this driver as a module, choose M here: the + module will be called pd692x0. + +config PSE_SI3474 + tristate "Si3474 PSE controller" + depends on I2C + help + This module provides support for Si3474 regulator based Ethernet + Power Sourcing Equipment. + Only 4-pair PSE configurations are supported. + + To compile this driver as a module, choose M here: the + module will be called si3474. + +config PSE_TPS23881 + tristate "TPS23881 PSE controller" + depends on I2C + help + This module provides support for TPS23881 regulator based Ethernet + Power Sourcing Equipment. + + To compile this driver as a module, choose M here: the + module will be called tps23881. +endif -- cgit v1.3.1