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/soc/Kconfig | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) create mode 100644 drivers/soc/Kconfig (limited to 'drivers/soc/Kconfig') diff --git a/drivers/soc/Kconfig b/drivers/soc/Kconfig new file mode 100644 index 000000000..a2d65adff --- /dev/null +++ b/drivers/soc/Kconfig @@ -0,0 +1,35 @@ +# SPDX-License-Identifier: GPL-2.0-only +menu "SOC (System On Chip) specific Drivers" + +source "drivers/soc/amlogic/Kconfig" +source "drivers/soc/apple/Kconfig" +source "drivers/soc/aspeed/Kconfig" +source "drivers/soc/atmel/Kconfig" +source "drivers/soc/bcm/Kconfig" +source "drivers/soc/canaan/Kconfig" +source "drivers/soc/cirrus/Kconfig" +source "drivers/soc/fsl/Kconfig" +source "drivers/soc/fujitsu/Kconfig" +source "drivers/soc/hisilicon/Kconfig" +source "drivers/soc/imx/Kconfig" +source "drivers/soc/ixp4xx/Kconfig" +source "drivers/soc/litex/Kconfig" +source "drivers/soc/loongson/Kconfig" +source "drivers/soc/mediatek/Kconfig" +source "drivers/soc/microchip/Kconfig" +source "drivers/soc/nuvoton/Kconfig" +source "drivers/soc/pxa/Kconfig" +source "drivers/soc/qcom/Kconfig" +source "drivers/soc/renesas/Kconfig" +source "drivers/soc/rockchip/Kconfig" +source "drivers/soc/samsung/Kconfig" +source "drivers/soc/sophgo/Kconfig" +source "drivers/soc/sunxi/Kconfig" +source "drivers/soc/tegra/Kconfig" +source "drivers/soc/ti/Kconfig" +source "drivers/soc/ux500/Kconfig" +source "drivers/soc/versatile/Kconfig" +source "drivers/soc/vt8500/Kconfig" +source "drivers/soc/xilinx/Kconfig" + +endmenu -- cgit v1.3.1