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 --- drivers/md/dm-vdo/status-codes.h | 86 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 86 insertions(+) create mode 100644 drivers/md/dm-vdo/status-codes.h (limited to 'drivers/md/dm-vdo/status-codes.h') diff --git a/drivers/md/dm-vdo/status-codes.h b/drivers/md/dm-vdo/status-codes.h new file mode 100644 index 000000000..426dc8e2c --- /dev/null +++ b/drivers/md/dm-vdo/status-codes.h @@ -0,0 +1,86 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright 2023 Red Hat + */ + +#ifndef VDO_STATUS_CODES_H +#define VDO_STATUS_CODES_H + +#include "errors.h" + +enum { + UDS_ERRORS_BLOCK_SIZE = UDS_ERROR_CODE_BLOCK_END - UDS_ERROR_CODE_BASE, + VDO_ERRORS_BLOCK_START = UDS_ERROR_CODE_BLOCK_END, + VDO_ERRORS_BLOCK_END = VDO_ERRORS_BLOCK_START + UDS_ERRORS_BLOCK_SIZE, +}; + +/* VDO-specific status codes. */ +enum vdo_status_codes { + /* base of all VDO errors */ + VDO_STATUS_CODE_BASE = VDO_ERRORS_BLOCK_START, + /* we haven't written this yet */ + VDO_NOT_IMPLEMENTED = VDO_STATUS_CODE_BASE, + /* input out of range */ + VDO_OUT_OF_RANGE, + /* an invalid reference count would result */ + VDO_REF_COUNT_INVALID, + /* a free block could not be allocated */ + VDO_NO_SPACE, + /* improper or missing configuration option */ + VDO_BAD_CONFIGURATION, + /* prior operation still in progress */ + VDO_COMPONENT_BUSY, + /* page contents incorrect or corrupt data */ + VDO_BAD_PAGE, + /* unsupported version of some component */ + VDO_UNSUPPORTED_VERSION, + /* component id mismatch in decoder */ + VDO_INCORRECT_COMPONENT, + /* parameters have conflicting values */ + VDO_PARAMETER_MISMATCH, + /* no partition exists with a given id */ + VDO_UNKNOWN_PARTITION, + /* a partition already exists with a given id */ + VDO_PARTITION_EXISTS, + /* physical block growth of too few blocks */ + VDO_INCREMENT_TOO_SMALL, + /* incorrect checksum */ + VDO_CHECKSUM_MISMATCH, + /* a lock is held incorrectly */ + VDO_LOCK_ERROR, + /* the VDO is in read-only mode */ + VDO_READ_ONLY, + /* the VDO is shutting down */ + VDO_SHUTTING_DOWN, + /* the recovery journal has corrupt entries or corrupt metadata */ + VDO_CORRUPT_JOURNAL, + /* exceeds maximum number of slabs supported */ + VDO_TOO_MANY_SLABS, + /* a compressed block fragment is invalid */ + VDO_INVALID_FRAGMENT, + /* action is unsupported while rebuilding */ + VDO_RETRY_AFTER_REBUILD, + /* a block map entry is invalid */ + VDO_BAD_MAPPING, + /* bio_add_page failed */ + VDO_BIO_CREATION_FAILED, + /* bad magic number */ + VDO_BAD_MAGIC, + /* bad nonce */ + VDO_BAD_NONCE, + /* sequence number overflow */ + VDO_JOURNAL_OVERFLOW, + /* the VDO is not in a state to perform an admin operation */ + VDO_INVALID_ADMIN_STATE, + /* one more than last error code */ + VDO_STATUS_CODE_LAST, + VDO_STATUS_CODE_BLOCK_END = VDO_ERRORS_BLOCK_END +}; + +extern const struct error_info vdo_status_list[]; + +int vdo_register_status_codes(void); + +int vdo_status_to_errno(int error); + +#endif /* VDO_STATUS_CODES_H */ -- cgit v1.3.1