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/rds/Makefile | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) create mode 100644 net/rds/Makefile (limited to 'net/rds/Makefile') diff --git a/net/rds/Makefile b/net/rds/Makefile new file mode 100644 index 000000000..3af1ca1d9 --- /dev/null +++ b/net/rds/Makefile @@ -0,0 +1,22 @@ +# SPDX-License-Identifier: GPL-2.0 +obj-$(CONFIG_RDS) += rds.o +rds-y := af_rds.o bind.o cong.o connection.o info.o message.o \ + recv.o send.o stats.o sysctl.o threads.o transport.o \ + loop.o page.o rdma.o + +obj-$(CONFIG_RDS_RDMA) += rds_rdma.o +rds_rdma-y := rdma_transport.o \ + ib.o ib_cm.o ib_recv.o ib_ring.o ib_send.o ib_stats.o \ + ib_sysctl.o ib_rdma.o ib_frmr.o + + +obj-$(CONFIG_RDS_TCP) += rds_tcp.o +rds_tcp-y := tcp.o tcp_connect.o tcp_listen.o tcp_recv.o \ + tcp_send.o tcp_stats.o + +ccflags-$(CONFIG_RDS_DEBUG) := -DRDS_DEBUG + +# for GCOV coverage profiling +ifdef CONFIG_GCOV_PROFILE_RDS +GCOV_PROFILE := y +endif -- cgit v1.3.1