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 --- samples/livepatch/Makefile | 8 ++++++++ 1 file changed, 8 insertions(+) create mode 100644 samples/livepatch/Makefile (limited to 'samples/livepatch/Makefile') diff --git a/samples/livepatch/Makefile b/samples/livepatch/Makefile new file mode 100644 index 000000000..9f853eeb6 --- /dev/null +++ b/samples/livepatch/Makefile @@ -0,0 +1,8 @@ +# SPDX-License-Identifier: GPL-2.0-only +obj-$(CONFIG_SAMPLE_LIVEPATCH) += livepatch-sample.o +obj-$(CONFIG_SAMPLE_LIVEPATCH) += livepatch-shadow-mod.o +obj-$(CONFIG_SAMPLE_LIVEPATCH) += livepatch-shadow-fix1.o +obj-$(CONFIG_SAMPLE_LIVEPATCH) += livepatch-shadow-fix2.o +obj-$(CONFIG_SAMPLE_LIVEPATCH) += livepatch-callbacks-demo.o +obj-$(CONFIG_SAMPLE_LIVEPATCH) += livepatch-callbacks-mod.o +obj-$(CONFIG_SAMPLE_LIVEPATCH) += livepatch-callbacks-busymod.o -- cgit v1.3.1