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 --- Documentation/driver-api/target.rst | 52 +++++++++++++++++++++++++++++++++++++ 1 file changed, 52 insertions(+) create mode 100644 Documentation/driver-api/target.rst (limited to 'Documentation/driver-api/target.rst') diff --git a/Documentation/driver-api/target.rst b/Documentation/driver-api/target.rst new file mode 100644 index 000000000..c70ca2517 --- /dev/null +++ b/Documentation/driver-api/target.rst @@ -0,0 +1,52 @@ +================================= +target and iSCSI Interfaces Guide +================================= + +Introduction and Overview +========================= + +TBD + +Target core device interfaces +============================= + +This section is blank because no kerneldoc comments have been added to +drivers/target/target_core_device.c. + +Target core transport interfaces +================================ + +.. kernel-doc:: drivers/target/target_core_transport.c + :export: + +Target-supported userspace I/O +============================== + +.. kernel-doc:: drivers/target/target_core_user.c + :doc: Userspace I/O + +.. kernel-doc:: include/uapi/linux/target_core_user.h + :doc: Ring Design + +iSCSI helper functions +====================== + +.. kernel-doc:: drivers/scsi/libiscsi.c + :export: + + +iSCSI boot information +====================== + +.. kernel-doc:: drivers/scsi/iscsi_boot_sysfs.c + :export: + +iSCSI TCP interfaces +==================== + +.. kernel-doc:: drivers/scsi/iscsi_tcp.c + :internal: + +.. kernel-doc:: drivers/scsi/libiscsi_tcp.c + :export: + -- cgit v1.3.1