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/helpers/mutex.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) create mode 100644 rust/helpers/mutex.c (limited to 'rust/helpers/mutex.c') diff --git a/rust/helpers/mutex.c b/rust/helpers/mutex.c new file mode 100644 index 000000000..1b07d6e64 --- /dev/null +++ b/rust/helpers/mutex.c @@ -0,0 +1,30 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include + +__rust_helper void rust_helper_mutex_lock(struct mutex *lock) +{ + mutex_lock(lock); +} + +__rust_helper int rust_helper_mutex_trylock(struct mutex *lock) +{ + return mutex_trylock(lock); +} + +__rust_helper void rust_helper___mutex_init(struct mutex *mutex, + const char *name, + struct lock_class_key *key) +{ + __mutex_init(mutex, name, key); +} + +__rust_helper void rust_helper_mutex_assert_is_held(struct mutex *mutex) +{ + lockdep_assert_held(mutex); +} + +__rust_helper void rust_helper_mutex_destroy(struct mutex *lock) +{ + mutex_destroy(lock); +} -- cgit v1.3.1