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/dma/stm32/Kconfig | 47 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) create mode 100644 drivers/dma/stm32/Kconfig (limited to 'drivers/dma/stm32/Kconfig') diff --git a/drivers/dma/stm32/Kconfig b/drivers/dma/stm32/Kconfig new file mode 100644 index 000000000..4d8d80631 --- /dev/null +++ b/drivers/dma/stm32/Kconfig @@ -0,0 +1,47 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +# STM32 DMA controllers drivers +# +if ARCH_STM32 || COMPILE_TEST + +config STM32_DMA + bool "STMicroelectronics STM32 DMA support" + select DMA_ENGINE + select DMA_VIRTUAL_CHANNELS + help + Enable support for the on-chip DMA controller on STMicroelectronics + STM32 platforms. + If you have a board based on STM32 SoC with such DMA controller + and want to use DMA say Y here. + +config STM32_DMAMUX + bool "STMicroelectronics STM32 DMA multiplexer support" + depends on STM32_DMA + help + Enable support for the on-chip DMA multiplexer on STMicroelectronics + STM32 platforms. + If you have a board based on STM32 SoC with such DMA multiplexer + and want to use DMAMUX say Y here. + +config STM32_MDMA + bool "STMicroelectronics STM32 master DMA support" + depends on OF + select DMA_ENGINE + select DMA_VIRTUAL_CHANNELS + help + Enable support for the on-chip MDMA controller on STMicroelectronics + STM32 platforms. + If you have a board based on STM32 SoC with such DMA controller + and want to use MDMA say Y here. + +config STM32_DMA3 + tristate "STMicroelectronics STM32 DMA3 support" + select DMA_ENGINE + select DMA_VIRTUAL_CHANNELS + help + Enable support for the on-chip DMA3 controller on STMicroelectronics + STM32 platforms. + If you have a board based on STM32 SoC with such DMA3 controller + and want to use DMA3, say Y here. + +endif -- cgit v1.3.1