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/firmware/Makefile | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) create mode 100644 drivers/firmware/Makefile (limited to 'drivers/firmware/Makefile') diff --git a/drivers/firmware/Makefile b/drivers/firmware/Makefile new file mode 100644 index 000000000..4ddec2820 --- /dev/null +++ b/drivers/firmware/Makefile @@ -0,0 +1,40 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Makefile for the linux kernel. +# +obj-$(CONFIG_ARM_SCPI_PROTOCOL) += arm_scpi.o +obj-$(CONFIG_ARM_SDE_INTERFACE) += arm_sdei.o +obj-$(CONFIG_DMI) += dmi_scan.o +obj-$(CONFIG_DMI_SYSFS) += dmi-sysfs.o +obj-$(CONFIG_EDD) += edd.o +obj-$(CONFIG_DMIID) += dmi-id.o +obj-$(CONFIG_INTEL_STRATIX10_SERVICE) += stratix10-svc.o +obj-$(CONFIG_INTEL_STRATIX10_RSU) += stratix10-rsu.o +obj-$(CONFIG_ISCSI_IBFT_FIND) += iscsi_ibft_find.o +obj-$(CONFIG_ISCSI_IBFT) += iscsi_ibft.o +obj-$(CONFIG_FIRMWARE_MEMMAP) += memmap.o +obj-$(CONFIG_MTK_ADSP_IPC) += mtk-adsp-ipc.o +obj-$(CONFIG_RASPBERRYPI_FIRMWARE) += raspberrypi.o +obj-$(CONFIG_FW_CFG_SYSFS) += qemu_fw_cfg.o +obj-$(CONFIG_SYSFB) += sysfb.o +obj-$(CONFIG_SYSFB_SIMPLEFB) += sysfb_simplefb.o +obj-$(CONFIG_TH1520_AON_PROTOCOL) += thead,th1520-aon.o +obj-$(CONFIG_TI_SCI_PROTOCOL) += ti_sci.o +obj-$(CONFIG_TRUSTED_FOUNDATIONS) += trusted_foundations.o +obj-$(CONFIG_TURRIS_MOX_RWTM) += turris-mox-rwtm.o + +obj-y += arm_ffa/ +obj-y += arm_scmi/ +obj-y += broadcom/ +obj-y += cirrus/ +obj-y += meson/ +obj-y += microchip/ +obj-$(CONFIG_GOOGLE_FIRMWARE) += google/ +obj-y += efi/ +obj-y += imx/ +obj-y += psci/ +obj-y += qcom/ +obj-y += samsung/ +obj-y += smccc/ +obj-y += tegra/ +obj-y += xilinx/ -- cgit v1.3.1