From 6668ed271eaefaa63e686bdfbedaeb7b8e492722 Mon Sep 17 00:00:00 2001 From: Kumar Kartikeya Dwivedi Date: Fri, 4 Sep 2026 10:43:19 +0200 Subject: selftests/bpf: Reject graph kptr use after RCU unlock Add a sleepable verifier test that loads a graph-node local kptr in an explicit RCU read-side critical section, then passes its node to bpf_rbtree_remove() after the section ends. Before the verifier fix, the stale NON_OWN_REF flag makes the node look like a live borrowed reference and the program is accepted. After the fix, the pointer is demoted without NON_OWN_REF and the graph kfunc argument is rejected. Also exercise a graph kptr loaded while a spin lock provides implicit RCU protection. The pointer must be invalidated when the lock is released, which guards the required ordering between non-owning-reference invalidation and RCU demotion. Update the existing fault-protected load test state description. The post-unlock pointer no longer carries NON_OWN_REF, but remains readable because the load is rewritten to use BPF_PROBE_MEM. Signed-off-by: Kumar Kartikeya Dwivedi Link: https://lore.kernel.org/r/20260904084325.52250-7-memxor@gmail.com Signed-off-by: Alexei Starovoitov --- fs/btrfs/tests/btrfs-tests.h | 83 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 83 insertions(+) create mode 100644 fs/btrfs/tests/btrfs-tests.h (limited to 'fs/btrfs/tests/btrfs-tests.h') diff --git a/fs/btrfs/tests/btrfs-tests.h b/fs/btrfs/tests/btrfs-tests.h new file mode 100644 index 000000000..cea58fe84 --- /dev/null +++ b/fs/btrfs/tests/btrfs-tests.h @@ -0,0 +1,83 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (C) 2013 Fusion IO. All rights reserved. + */ + +#ifndef BTRFS_TESTS_H +#define BTRFS_TESTS_H + +#include +#include + +#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS + +int btrfs_run_sanity_tests(void); + +#define test_msg(fmt, ...) pr_info("BTRFS: selftest: " fmt "\n", ##__VA_ARGS__) +#define test_err(fmt, ...) pr_err("BTRFS: selftest: %s:%d " fmt "\n", \ + __FILE__, __LINE__, ##__VA_ARGS__) + +#define test_std_err(index) test_err("%s", test_error[index]) + +enum { + TEST_ALLOC_FS_INFO, + TEST_ALLOC_ROOT, + TEST_ALLOC_EXTENT_BUFFER, + TEST_ALLOC_PATH, + TEST_ALLOC_INODE, + TEST_ALLOC_BLOCK_GROUP, + TEST_ALLOC_EXTENT_MAP, + TEST_ALLOC_CHUNK_MAP, + TEST_ALLOC_IO_CONTEXT, + TEST_ALLOC_TRANSACTION, +}; + +extern const char *test_error[]; + +struct btrfs_root; +struct btrfs_trans_handle; +struct btrfs_transaction; + +int btrfs_test_extent_buffer_operations(u32 sectorsize, u32 nodesize); +int btrfs_test_free_space_cache(u32 sectorsize, u32 nodesize); +int btrfs_test_extent_io(u32 sectorsize, u32 nodesize); +int btrfs_test_inodes(u32 sectorsize, u32 nodesize); +int btrfs_test_qgroups(u32 sectorsize, u32 nodesize); +int btrfs_test_free_space_tree(u32 sectorsize, u32 nodesize); +int btrfs_test_raid_stripe_tree(u32 sectorsize, u32 nodesize); +int btrfs_test_extent_map(void); +int btrfs_test_delayed_refs(u32 sectorsize, u32 nodesize); +int btrfs_test_chunk_allocation(u32 sectorsize, u32 nodesize); +struct inode *btrfs_new_test_inode(void); +struct btrfs_fs_info *btrfs_alloc_dummy_fs_info(u32 nodesize, u32 sectorsize); +void btrfs_free_dummy_fs_info(struct btrfs_fs_info *fs_info); +DEFINE_FREE(btrfs_free_dummy_fs_info, struct btrfs_fs_info *, + btrfs_free_dummy_fs_info(_T)) +void btrfs_free_dummy_root(struct btrfs_root *root); +struct btrfs_block_group * +btrfs_alloc_dummy_block_group(struct btrfs_fs_info *fs_info, unsigned long length); +void btrfs_free_dummy_block_group(struct btrfs_block_group *cache); +DEFINE_FREE(btrfs_free_dummy_block_group, struct btrfs_block_group *, + btrfs_free_dummy_block_group(_T)); +void btrfs_init_dummy_trans(struct btrfs_trans_handle *trans, + struct btrfs_fs_info *fs_info); +void btrfs_init_dummy_transaction(struct btrfs_transaction *trans, struct btrfs_fs_info *fs_info); +struct btrfs_device *btrfs_alloc_dummy_device(struct btrfs_fs_info *fs_info); + +#ifdef CONFIG_BLK_DEV_ZONED +int btrfs_test_zoned(void); +#else +static inline int btrfs_test_zoned(void) +{ + return 0; +} +#endif + +#else +static inline int btrfs_run_sanity_tests(void) +{ + return 0; +} +#endif + +#endif -- cgit v1.3.1