From 506ada89629ec7059b96ecfb0dc7d33ece0103ca Mon Sep 17 00:00:00 2001 From: Eduard Zingerman Date: Fri, 4 Sep 2026 17:05:56 -0700 Subject: bpf: mark a NULL kfunc argument precise check_kfunc_arg() allows bpf_register_is_null() for nullable arguments w/o marking the underlying scalar register precise. Hence a checkpoint created on such a path would prune against arbitrary scalar value. Fixes: 3bda08b63670 ("bpf: Allow NULL buffers in bpf_dynptr_slice(_rw)") Signed-off-by: Eduard Zingerman Link: https://lore.kernel.org/r/20260904-register-is-null-precise-fixes-v1-5-0f5a360ff15d@gmail.com Signed-off-by: Alexei Starovoitov --- Documentation/driver-api/auxiliary_bus.rst | 49 ++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 Documentation/driver-api/auxiliary_bus.rst (limited to 'Documentation/driver-api/auxiliary_bus.rst') diff --git a/Documentation/driver-api/auxiliary_bus.rst b/Documentation/driver-api/auxiliary_bus.rst new file mode 100644 index 000000000..b236de773 --- /dev/null +++ b/Documentation/driver-api/auxiliary_bus.rst @@ -0,0 +1,49 @@ +.. SPDX-License-Identifier: GPL-2.0-only + +.. _auxiliary_bus: + +============= +Auxiliary Bus +============= + +.. kernel-doc:: drivers/base/auxiliary.c + :doc: PURPOSE + +When Should the Auxiliary Bus Be Used +===================================== + +.. kernel-doc:: drivers/base/auxiliary.c + :doc: USAGE + + +Auxiliary Device Creation +========================= + +.. kernel-doc:: include/linux/auxiliary_bus.h + :identifiers: auxiliary_device + +.. kernel-doc:: drivers/base/auxiliary.c + :identifiers: auxiliary_device_init __auxiliary_device_add + +Auxiliary Device Memory Model and Lifespan +------------------------------------------ + +.. kernel-doc:: include/linux/auxiliary_bus.h + :doc: DEVICE_LIFESPAN + + +Auxiliary Drivers +================= + +.. kernel-doc:: include/linux/auxiliary_bus.h + :identifiers: auxiliary_driver module_auxiliary_driver + +.. kernel-doc:: drivers/base/auxiliary.c + :identifiers: __auxiliary_driver_register auxiliary_driver_unregister + +Example Usage +============= + +.. kernel-doc:: drivers/base/auxiliary.c + :doc: EXAMPLE + -- cgit v1.3.1