From 2b97956af60810cd382b86b9ce9aea421b889861 Mon Sep 17 00:00:00 2001 From: Nuoqi Gui Date: Fri, 4 Sep 2026 12:41:55 +0200 Subject: selftests/bpf: Test rhtab kptr cancellation semantics Resizable hash-map updates and deletions must not perform full special-field destruction in their caller context. In particular, a referenced kptr must remain attached to the allocation until the memory allocator destructor can release it safely. Add separate coverage for both affected paths. The update test stores a task kptr, replaces the ordinary value bytes with BPF_EXIST, and verifies that the kptr survived. The delete test removes an element and exchanges its kptr through the still-valid map-value pointer before the allocation is reclaimed. Both cases observe a NULL kptr when rhtab uses bpf_obj_free_fields(). They recover and release the reference after rhtab switches to cancellation semantics. Signed-off-by: Nuoqi Gui [ kkd: Split update and delete coverage and rewrote the commit log ] Signed-off-by: Kumar Kartikeya Dwivedi Link: https://lore.kernel.org/r/20260904104203.345917-5-memxor@gmail.com Signed-off-by: Alexei Starovoitov --- tools/lib/api/Build | 9 +++++++++ 1 file changed, 9 insertions(+) create mode 100644 tools/lib/api/Build (limited to 'tools/lib/api/Build') diff --git a/tools/lib/api/Build b/tools/lib/api/Build new file mode 100644 index 000000000..6e2373db5 --- /dev/null +++ b/tools/lib/api/Build @@ -0,0 +1,9 @@ +libapi-y += fd/ +libapi-y += fs/ +libapi-y += cpu.o +libapi-y += debug.o +libapi-y += str_error_r.o + +$(OUTPUT)str_error_r.o: ../str_error_r.c FORCE + $(call rule_mkdir) + $(call if_changed_dep,cc_o_c) -- cgit v1.3.1