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/sunrpc/Makefile | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) create mode 100644 net/sunrpc/Makefile (limited to 'net/sunrpc/Makefile') diff --git a/net/sunrpc/Makefile b/net/sunrpc/Makefile new file mode 100644 index 000000000..96727df3a --- /dev/null +++ b/net/sunrpc/Makefile @@ -0,0 +1,21 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Makefile for Linux kernel SUN RPC +# + + +obj-$(CONFIG_SUNRPC) += sunrpc.o +obj-$(CONFIG_SUNRPC_GSS) += auth_gss/ +obj-$(CONFIG_SUNRPC_XPRT_RDMA) += xprtrdma/ + +sunrpc-y := clnt.o xprt.o socklib.o xprtsock.o sched.o \ + auth.o auth_null.o auth_tls.o auth_unix.o \ + svc.o svcsock.o svcauth.o svcauth_unix.o \ + addr.o rpcb_clnt.o timer.o xdr.o \ + sunrpc_syms.o cache.o rpc_pipe.o sysfs.o \ + svc_xprt.o \ + xprtmultipath.o netlink.o +sunrpc-$(CONFIG_SUNRPC_DEBUG) += debugfs.o +sunrpc-$(CONFIG_SUNRPC_BACKCHANNEL) += backchannel_rqst.o +sunrpc-$(CONFIG_PROC_FS) += stats.o +sunrpc-$(CONFIG_SYSCTL) += sysctl.o -- cgit v1.3.1