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/ext4/Makefile | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) create mode 100644 fs/ext4/Makefile (limited to 'fs/ext4/Makefile') diff --git a/fs/ext4/Makefile b/fs/ext4/Makefile new file mode 100644 index 000000000..3f9fc0eb8 --- /dev/null +++ b/fs/ext4/Makefile @@ -0,0 +1,21 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# Makefile for the linux ext4-filesystem routines. +# + +obj-$(CONFIG_EXT4_FS) += ext4.o + +ext4-y := balloc.o bitmap.o block_validity.o dir.o ext4_jbd2.o extents.o \ + extents_status.o file.o fsmap.o fsync.o hash.o ialloc.o \ + indirect.o inline.o inode.o ioctl.o mballoc.o migrate.o \ + mmp.o move_extent.o namei.o page-io.o readpage.o resize.o \ + super.o symlink.o sysfs.o xattr.o xattr_hurd.o xattr_trusted.o \ + xattr_user.o fast_commit.o orphan.o + +ext4-$(CONFIG_EXT4_FS_POSIX_ACL) += acl.o +ext4-$(CONFIG_EXT4_FS_SECURITY) += xattr_security.o +ext4-test-objs += inode-test.o mballoc-test.o \ + extents-test.o hash-test.o +obj-$(CONFIG_EXT4_KUNIT_TESTS) += ext4-test.o +ext4-$(CONFIG_FS_VERITY) += verity.o +ext4-$(CONFIG_FS_ENCRYPTION) += crypto.o -- cgit v1.3.1