From 33a154a96e71a34a1bcca9f40da343dbbf7b38b4 Mon Sep 17 00:00:00 2001 From: Alexei Starovoitov Date: Thu, 1 Oct 2026 14:52:55 +0000 Subject: selftests/bpf: Test packet range of pointers sharing an id Add tests where two packet pointers share an id and tightening one pointer's umax from its var_off would put it less than their constant distance from the other's umax: with an index & 0x38 capped at 50, the base pointer keeps umax 50, so the pointer 8 bytes further on must keep umax 58, even though its known bits allow at most 56. These refused a valid program or accepted an out-of-bounds access before the fix: - check the advanced copy, load through the base: valid, was refused; - check the base, load the byte at base + 1 through a copy advanced by 8: was accepted; - check base + 4, load 4 bytes at base + 2 through base + 8: reads two bytes past the checked range, was accepted; - the same as the second with data_meta pointers checked against data: was accepted. These pass with and without the fix and cover nearby paths: - subtract an unknown scalar from a checked pointer and load below it (the range is kept across a new id); - reach a load through two paths whose checks cover 8 and 7 bytes after the loaded pointer; the second path must not be pruned by the first; - spill a copy of a pointer, check the pointer, fill the copy and load one byte past the checked range: the load is refused, and the copy has the range of the check. Signed-off-by: Alexei Starovoitov Link: https://lore.kernel.org/bpf/20261001145255.855630-2-alexei.starovoitov@gmail.com Signed-off-by: Kumar Kartikeya Dwivedi --- rust/uapi/lib.rs | 42 ++++++++++++++++++++++++++++++++++++++++++ rust/uapi/uapi_helper.h | 17 +++++++++++++++++ 2 files changed, 59 insertions(+) create mode 100644 rust/uapi/lib.rs create mode 100644 rust/uapi/uapi_helper.h (limited to 'rust/uapi') diff --git a/rust/uapi/lib.rs b/rust/uapi/lib.rs new file mode 100644 index 000000000..003e6d4f7 --- /dev/null +++ b/rust/uapi/lib.rs @@ -0,0 +1,42 @@ +// SPDX-License-Identifier: GPL-2.0 + +//! UAPI Bindings. +//! +//! Contains the bindings generated by `bindgen` for UAPI interfaces. +//! +//! This crate may be used directly by drivers that need to interact with +//! userspace APIs. + +#![no_std] +#![allow( + clippy::all, + clippy::as_underscore, + clippy::cast_lossless, + clippy::ptr_as_ptr, + clippy::ref_as_ptr, + clippy::undocumented_unsafe_blocks, + dead_code, + missing_docs, + non_camel_case_types, + non_upper_case_globals, + non_snake_case, + improper_ctypes, + unreachable_pub, + unsafe_op_in_unsafe_fn +)] +#![cfg_attr(not(CONFIG_RUSTC_HAS_UNNECESSARY_TRANSMUTES), allow(unknown_lints))] +#![allow(unnecessary_transmutes)] +#![cfg_attr( + CONFIG_RUSTC_HAS_SUSPICIOUS_RUNTIME_SYMBOL_DEFINITIONS, + allow(suspicious_runtime_symbol_definitions) +)] +#![feature(cfi_encoding)] + +// Manual definition of blocklisted types. +type __kernel_size_t = usize; +type __kernel_ssize_t = isize; +type __kernel_ptrdiff_t = isize; + +use pin_init::MaybeZeroable; + +include!(concat!(env!("OBJTREE"), "/rust/uapi/uapi_generated.rs")); diff --git a/rust/uapi/uapi_helper.h b/rust/uapi/uapi_helper.h new file mode 100644 index 000000000..489748ef6 --- /dev/null +++ b/rust/uapi/uapi_helper.h @@ -0,0 +1,17 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Header that contains the headers for which Rust UAPI bindings + * will be automatically generated by `bindgen`. + * + * Sorted alphabetically. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include -- cgit v1.3.1