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 --- fs/afs/Makefile | 46 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) create mode 100644 fs/afs/Makefile (limited to 'fs/afs/Makefile') diff --git a/fs/afs/Makefile b/fs/afs/Makefile new file mode 100644 index 000000000..0d8f1982d --- /dev/null +++ b/fs/afs/Makefile @@ -0,0 +1,46 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Makefile for Red Hat Linux AFS client. +# + +kafs-y := \ + addr_list.o \ + addr_prefs.o \ + callback.o \ + cell.o \ + cm_security.o \ + cmservice.o \ + dir.o \ + dir_edit.o \ + dir_search.o \ + dir_silly.o \ + dynroot.o \ + file.o \ + flock.o \ + fsclient.o \ + fs_operation.o \ + fs_probe.o \ + inode.o \ + main.o \ + misc.o \ + mntpt.o \ + rotate.o \ + rxrpc.o \ + security.o \ + server.o \ + server_list.o \ + super.o \ + symlink.o \ + validation.o \ + vlclient.o \ + vl_alias.o \ + vl_list.o \ + vl_probe.o \ + vl_rotate.o \ + volume.o \ + write.o \ + xattr.o \ + yfsclient.o + +kafs-$(CONFIG_PROC_FS) += proc.o +obj-$(CONFIG_AFS_FS) := kafs.o -- cgit v1.3.1