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 --- arch/m68k/fpsp040/README | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) create mode 100644 arch/m68k/fpsp040/README (limited to 'arch/m68k/fpsp040/README') diff --git a/arch/m68k/fpsp040/README b/arch/m68k/fpsp040/README new file mode 100644 index 000000000..f57494460 --- /dev/null +++ b/arch/m68k/fpsp040/README @@ -0,0 +1,30 @@ + +MOTOROLA MICROPROCESSOR & MEMORY TECHNOLOGY GROUP +M68000 Hi-Performance Microprocessor Division +M68040 Software Package + +M68040 Software Package Copyright (c) 1993, 1994 Motorola Inc. +All rights reserved. + +THE SOFTWARE is provided on an "AS IS" basis and without warranty. +To the maximum extent permitted by applicable law, +MOTOROLA DISCLAIMS ALL WARRANTIES WHETHER EXPRESS OR IMPLIED, +INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A +PARTICULAR PURPOSE and any warranty against infringement with +regard to the SOFTWARE (INCLUDING ANY MODIFIED VERSIONS THEREOF) +and any accompanying written materials. + +To the maximum extent permitted by applicable law, +IN NO EVENT SHALL MOTOROLA BE LIABLE FOR ANY DAMAGES WHATSOEVER +(INCLUDING WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS +PROFITS, BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, OR +OTHER PECUNIARY LOSS) ARISING OF THE USE OR INABILITY TO USE THE +SOFTWARE. Motorola assumes no responsibility for the maintenance +and support of the SOFTWARE. + +You are hereby granted a copyright license to use, modify, and +distribute the SOFTWARE so long as this entire notice is retained +without alteration in any modified and/or redistributed versions, +and that such modified versions are clearly identified as such. +No licenses are granted by implication, estoppel or otherwise +under any patents or trademarks of Motorola, Inc. -- cgit v1.3.1