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/rxrpc/Makefile | 49 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 net/rxrpc/Makefile (limited to 'net/rxrpc/Makefile') diff --git a/net/rxrpc/Makefile b/net/rxrpc/Makefile new file mode 100644 index 000000000..f994f9f30 --- /dev/null +++ b/net/rxrpc/Makefile @@ -0,0 +1,49 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Makefile for Linux kernel RxRPC +# + +obj-$(CONFIG_AF_RXRPC) += rxrpc.o + +rxrpc-y := \ + af_rxrpc.o \ + call_accept.o \ + call_event.o \ + call_object.o \ + call_state.o \ + conn_client.o \ + conn_event.o \ + conn_object.o \ + conn_service.o \ + input.o \ + input_rack.o \ + insecure.o \ + io_thread.o \ + key.o \ + local_event.o \ + local_object.o \ + misc.o \ + net_ns.o \ + oob.o \ + output.o \ + peer_event.o \ + peer_object.o \ + recvmsg.o \ + rtt.o \ + security.o \ + sendmsg.o \ + server_key.o \ + skbuff.o \ + txbuf.o \ + utils.o + +rxrpc-$(CONFIG_PROC_FS) += proc.o +rxrpc-$(CONFIG_RXKAD) += rxkad.o fcrypt.o +rxrpc-$(CONFIG_SYSCTL) += sysctl.o +rxrpc-$(CONFIG_RXGK) += \ + rxgk.o \ + rxgk_app.o \ + rxgk_kdf.o + +obj-$(CONFIG_RXPERF) += rxperf.o +obj-$(CONFIG_KUNIT) += tests/ -- cgit v1.3.1