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/udf/udfend.h | 78 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 78 insertions(+) create mode 100644 fs/udf/udfend.h (limited to 'fs/udf/udfend.h') diff --git a/fs/udf/udfend.h b/fs/udf/udfend.h new file mode 100644 index 000000000..a4363ac2c --- /dev/null +++ b/fs/udf/udfend.h @@ -0,0 +1,78 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __UDF_ENDIAN_H +#define __UDF_ENDIAN_H + +#include +#include + +static inline struct kernel_lb_addr lelb_to_cpu(struct lb_addr in) +{ + struct kernel_lb_addr out; + + out.logicalBlockNum = le32_to_cpu(in.logicalBlockNum); + out.partitionReferenceNum = le16_to_cpu(in.partitionReferenceNum); + + return out; +} + +static inline struct lb_addr cpu_to_lelb(struct kernel_lb_addr in) +{ + struct lb_addr out; + + out.logicalBlockNum = cpu_to_le32(in.logicalBlockNum); + out.partitionReferenceNum = cpu_to_le16(in.partitionReferenceNum); + + return out; +} + +static inline struct short_ad lesa_to_cpu(struct short_ad in) +{ + struct short_ad out; + + out.extLength = le32_to_cpu(in.extLength); + out.extPosition = le32_to_cpu(in.extPosition); + + return out; +} + +static inline struct short_ad cpu_to_lesa(struct short_ad in) +{ + struct short_ad out; + + out.extLength = cpu_to_le32(in.extLength); + out.extPosition = cpu_to_le32(in.extPosition); + + return out; +} + +static inline struct kernel_long_ad lela_to_cpu(struct long_ad in) +{ + struct kernel_long_ad out; + + out.extLength = le32_to_cpu(in.extLength); + out.extLocation = lelb_to_cpu(in.extLocation); + + return out; +} + +static inline struct long_ad cpu_to_lela(struct kernel_long_ad in) +{ + struct long_ad out; + + out.extLength = cpu_to_le32(in.extLength); + out.extLocation = cpu_to_lelb(in.extLocation); + + return out; +} + +static inline struct kernel_extent_ad leea_to_cpu(struct extent_ad in) +{ + struct kernel_extent_ad out; + + out.extLength = le32_to_cpu(in.extLength); + out.extLocation = le32_to_cpu(in.extLocation); + + return out; +} + +#endif /* __UDF_ENDIAN_H */ -- cgit v1.3.1