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/befs/datastream.h | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) create mode 100644 fs/befs/datastream.h (limited to 'fs/befs/datastream.h') diff --git a/fs/befs/datastream.h b/fs/befs/datastream.h new file mode 100644 index 000000000..39b1d4766 --- /dev/null +++ b/fs/befs/datastream.h @@ -0,0 +1,20 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * datastream.h + * + */ + +struct buffer_head *befs_read_datastream(struct super_block *sb, + const befs_data_stream *ds, + befs_off_t pos, uint *off); + +int befs_fblock2brun(struct super_block *sb, const befs_data_stream *data, + befs_blocknr_t fblock, befs_block_run *run); + +size_t befs_read_lsymlink(struct super_block *sb, const befs_data_stream *data, + void *buff, befs_off_t len); + +befs_blocknr_t befs_count_blocks(struct super_block *sb, + const befs_data_stream *ds); + +extern const befs_inode_addr BAD_IADDR; -- cgit v1.3.1