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 --- net/vmw_vsock/Makefile | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) create mode 100644 net/vmw_vsock/Makefile (limited to 'net/vmw_vsock/Makefile') diff --git a/net/vmw_vsock/Makefile b/net/vmw_vsock/Makefile new file mode 100644 index 000000000..5da74c4a9 --- /dev/null +++ b/net/vmw_vsock/Makefile @@ -0,0 +1,22 @@ +# SPDX-License-Identifier: GPL-2.0 +obj-$(CONFIG_VSOCKETS) += vsock.o +obj-$(CONFIG_VSOCKETS_DIAG) += vsock_diag.o +obj-$(CONFIG_VMWARE_VMCI_VSOCKETS) += vmw_vsock_vmci_transport.o +obj-$(CONFIG_VIRTIO_VSOCKETS) += vmw_vsock_virtio_transport.o +obj-$(CONFIG_VIRTIO_VSOCKETS_COMMON) += vmw_vsock_virtio_transport_common.o +obj-$(CONFIG_HYPERV_VSOCKETS) += hv_sock.o +obj-$(CONFIG_VSOCKETS_LOOPBACK) += vsock_loopback.o + +vsock-y += af_vsock.o af_vsock_tap.o vsock_addr.o +vsock-$(CONFIG_BPF_SYSCALL) += vsock_bpf.o + +vsock_diag-y += diag.o + +vmw_vsock_vmci_transport-y += vmci_transport.o vmci_transport_notify.o \ + vmci_transport_notify_qstate.o + +vmw_vsock_virtio_transport-y += virtio_transport.o + +vmw_vsock_virtio_transport_common-y += virtio_transport_common.o + +hv_sock-y += hyperv_transport.o -- cgit v1.3.1