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/ipack/Kconfig | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) create mode 100644 drivers/ipack/Kconfig (limited to 'drivers/ipack/Kconfig') diff --git a/drivers/ipack/Kconfig b/drivers/ipack/Kconfig new file mode 100644 index 000000000..fb30091de --- /dev/null +++ b/drivers/ipack/Kconfig @@ -0,0 +1,25 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +# IPACK configuration. +# + +menuconfig IPACK_BUS + tristate "IndustryPack bus support" + depends on HAS_IOMEM + help + This option provides support for the IndustryPack framework. There + are IndustryPack carrier boards, which interface another bus (such as + PCI) to an IndustryPack bus, and IndustryPack modules, that are + hosted on these buses. While IndustryPack modules can provide a + large variety of functionality, they are most often found in + industrial control applications. + + Say N if unsure. + +if IPACK_BUS + +source "drivers/ipack/carriers/Kconfig" + +source "drivers/ipack/devices/Kconfig" + +endif # IPACK -- cgit v1.3.1