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/admin-guide/abi-stable.rst | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) create mode 100644 Documentation/admin-guide/abi-stable.rst (limited to 'Documentation/admin-guide/abi-stable.rst') diff --git a/Documentation/admin-guide/abi-stable.rst b/Documentation/admin-guide/abi-stable.rst new file mode 100644 index 000000000..528c68401 --- /dev/null +++ b/Documentation/admin-guide/abi-stable.rst @@ -0,0 +1,16 @@ +.. SPDX-License-Identifier: GPL-2.0 + +ABI stable symbols +================== + +Documents the interfaces that the developer has defined to be stable. + +Userspace programs are free to use these interfaces with no +restrictions, and backward compatibility for them will be guaranteed +for at least 2 years. + +Most interfaces (like syscalls) are expected to never change and always +be available. + +.. kernel-abi:: stable + :no-files: -- cgit v1.3.1