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/objtool/Build | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) create mode 100644 tools/objtool/Build (limited to 'tools/objtool/Build') diff --git a/tools/objtool/Build b/tools/objtool/Build new file mode 100644 index 000000000..59f948628 --- /dev/null +++ b/tools/objtool/Build @@ -0,0 +1,39 @@ +objtool-y += arch/$(SRCARCH)/ + +objtool-y += weak.o + +objtool-y += check.o +objtool-y += special.o +objtool-y += builtin-check.o +objtool-y += elf.o +objtool-y += klp-symid.o +objtool-y += objtool.o + +objtool-$(BUILD_DISAS) += disas.o +objtool-$(BUILD_DISAS) += trace.o + +objtool-$(BUILD_ORC) += orc_gen.o orc_dump.o +objtool-$(BUILD_KLP) += builtin-klp.o klp-checksum.o klp-diff.o \ + klp-post-link.o klp-sympos.o + +objtool-y += libstring.o +objtool-y += libctype.o +objtool-y += str_error_r.o +objtool-y += librbtree.o +objtool-y += signal.o + +$(OUTPUT)libstring.o: ../lib/string.c FORCE + $(call rule_mkdir) + $(call if_changed_dep,cc_o_c) + +$(OUTPUT)libctype.o: ../lib/ctype.c FORCE + $(call rule_mkdir) + $(call if_changed_dep,cc_o_c) + +$(OUTPUT)str_error_r.o: ../lib/str_error_r.c FORCE + $(call rule_mkdir) + $(call if_changed_dep,cc_o_c) + +$(OUTPUT)librbtree.o: ../lib/rbtree.c FORCE + $(call rule_mkdir) + $(call if_changed_dep,cc_o_c) -- cgit v1.3.1