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/thunderbolt/Makefile | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) create mode 100644 drivers/thunderbolt/Makefile (limited to 'drivers/thunderbolt/Makefile') diff --git a/drivers/thunderbolt/Makefile b/drivers/thunderbolt/Makefile new file mode 100644 index 000000000..beb054c31 --- /dev/null +++ b/drivers/thunderbolt/Makefile @@ -0,0 +1,18 @@ +# SPDX-License-Identifier: GPL-2.0-only +ccflags-y := -I$(src) +obj-${CONFIG_USB4} := thunderbolt.o +thunderbolt-objs := nhi.o ctl.o tb.o switch.o cap.o pci.o path.o tunnel.o eeprom.o +thunderbolt-objs += domain.o dma_port.o icm.o property.o xdomain.o lc.o tmu.o usb4.o +thunderbolt-objs += usb4_port.o nvm.o retimer.o quirks.o clx.o + +thunderbolt-${CONFIG_ACPI} += acpi.o +thunderbolt-$(CONFIG_DEBUG_FS) += debugfs.o +thunderbolt-$(CONFIG_USB4_CONFIGFS) += configfs.o +thunderbolt-${CONFIG_USB4_KUNIT_TEST} += test.o +CFLAGS_test.o += $(DISABLE_STRUCTLEAK_PLUGIN) + +thunderbolt_dma_test-${CONFIG_USB4_DMA_TEST} += dma_test.o +obj-$(CONFIG_USB4_DMA_TEST) += thunderbolt_dma_test.o + +thunderbolt_stream-${CONFIG_USB4_STREAM} += stream.o +obj-$(CONFIG_USB4_STREAM) += thunderbolt_stream.o -- cgit v1.3.1