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/bcma/Makefile | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) create mode 100644 drivers/bcma/Makefile (limited to 'drivers/bcma/Makefile') diff --git a/drivers/bcma/Makefile b/drivers/bcma/Makefile new file mode 100644 index 000000000..f8c37de35 --- /dev/null +++ b/drivers/bcma/Makefile @@ -0,0 +1,18 @@ +# SPDX-License-Identifier: GPL-2.0 +bcma-y += main.o scan.o core.o sprom.o +bcma-y += driver_chipcommon.o driver_chipcommon_pmu.o +bcma-y += driver_chipcommon_b.o +bcma-$(CONFIG_BCMA_PFLASH) += driver_chipcommon_pflash.o +bcma-$(CONFIG_BCMA_SFLASH) += driver_chipcommon_sflash.o +bcma-$(CONFIG_BCMA_NFLASH) += driver_chipcommon_nflash.o +bcma-$(CONFIG_BCMA_DRIVER_PCI) += driver_pci.o +bcma-$(CONFIG_BCMA_DRIVER_PCI) += driver_pcie2.o +bcma-$(CONFIG_BCMA_DRIVER_PCI_HOSTMODE) += driver_pci_host.o +bcma-$(CONFIG_BCMA_DRIVER_MIPS) += driver_mips.o +bcma-$(CONFIG_BCMA_DRIVER_GMAC_CMN) += driver_gmac_cmn.o +bcma-$(CONFIG_BCMA_DRIVER_GPIO) += driver_gpio.o +bcma-$(CONFIG_BCMA_HOST_PCI) += host_pci.o +bcma-$(CONFIG_BCMA_HOST_SOC) += host_soc.o +obj-$(CONFIG_BCMA) += bcma.o + +ccflags-$(CONFIG_BCMA_DEBUG) := -DDEBUG -- cgit v1.3.1