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 --- tools/lib/thermal/libthermal.map | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) create mode 100644 tools/lib/thermal/libthermal.map (limited to 'tools/lib/thermal/libthermal.map') diff --git a/tools/lib/thermal/libthermal.map b/tools/lib/thermal/libthermal.map new file mode 100644 index 000000000..1d3d0c04e --- /dev/null +++ b/tools/lib/thermal/libthermal.map @@ -0,0 +1,33 @@ +LIBTHERMAL_0.0.1 { + global: + for_each_thermal_zone; + for_each_thermal_trip; + for_each_thermal_cdev; + for_each_thermal_threshold; + thermal_zone_find_by_name; + thermal_zone_find_by_id; + thermal_zone_discover; + thermal_init; + thermal_exit; + thermal_events_exit; + thermal_events_init; + thermal_events_handle; + thermal_events_fd; + thermal_cmd_exit; + thermal_cmd_init; + thermal_cmd_get_tz; + thermal_cmd_get_cdev; + thermal_cmd_get_trip; + thermal_cmd_get_governor; + thermal_cmd_get_temp; + thermal_cmd_threshold_get; + thermal_cmd_threshold_add; + thermal_cmd_threshold_delete; + thermal_cmd_threshold_flush; + thermal_sampling_exit; + thermal_sampling_init; + thermal_sampling_handle; + thermal_sampling_fd; +local: + *; +}; -- cgit v1.3.1