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 --- include/uapi/asm-generic/ucontext.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) create mode 100644 include/uapi/asm-generic/ucontext.h (limited to 'include/uapi/asm-generic/ucontext.h') diff --git a/include/uapi/asm-generic/ucontext.h b/include/uapi/asm-generic/ucontext.h new file mode 100644 index 000000000..351868a72 --- /dev/null +++ b/include/uapi/asm-generic/ucontext.h @@ -0,0 +1,13 @@ +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ +#ifndef __ASM_GENERIC_UCONTEXT_H +#define __ASM_GENERIC_UCONTEXT_H + +struct ucontext { + unsigned long uc_flags; + struct ucontext *uc_link; + stack_t uc_stack; + struct sigcontext uc_mcontext; + sigset_t uc_sigmask; /* mask last for extensibility */ +}; + +#endif /* __ASM_GENERIC_UCONTEXT_H */ -- cgit v1.3.1