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 --- drivers/media/test-drivers/Kconfig | 40 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) create mode 100644 drivers/media/test-drivers/Kconfig (limited to 'drivers/media/test-drivers/Kconfig') diff --git a/drivers/media/test-drivers/Kconfig b/drivers/media/test-drivers/Kconfig new file mode 100644 index 000000000..5a5379524 --- /dev/null +++ b/drivers/media/test-drivers/Kconfig @@ -0,0 +1,40 @@ +# SPDX-License-Identifier: GPL-2.0-only + +menuconfig V4L_TEST_DRIVERS + bool "V4L test drivers" + depends on VIDEO_DEV + +if V4L_TEST_DRIVERS + +config VIDEO_VIM2M + tristate "Virtual Memory-to-Memory Driver" + depends on VIDEO_DEV + select VIDEOBUF2_VMALLOC + select V4L2_MEM2MEM_DEV + select MEDIA_CONTROLLER + help + This is a virtual test device for the memory-to-memory driver + framework. + +source "drivers/media/test-drivers/vicodec/Kconfig" +source "drivers/media/test-drivers/vimc/Kconfig" +source "drivers/media/test-drivers/vivid/Kconfig" +source "drivers/media/test-drivers/visl/Kconfig" + +endif #V4L_TEST_DRIVERS + +menuconfig DVB_TEST_DRIVERS + bool "DVB test drivers" + depends on DVB_CORE && MEDIA_SUPPORT && I2C + help + Enables DVB test drivers. + + This enables the DVB test drivers. They are meant as an aid for + DVB device driver writers and developers working on userspace + media applications. + +if DVB_TEST_DRIVERS + +source "drivers/media/test-drivers/vidtv/Kconfig" + +endif #DVB_TEST_DRIVERS -- cgit v1.3.1