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/sh/Kconfig | 58 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 58 insertions(+) create mode 100644 drivers/dma/sh/Kconfig (limited to 'drivers/dma/sh/Kconfig') diff --git a/drivers/dma/sh/Kconfig b/drivers/dma/sh/Kconfig new file mode 100644 index 000000000..a16c7e83b --- /dev/null +++ b/drivers/dma/sh/Kconfig @@ -0,0 +1,58 @@ +# SPDX-License-Identifier: GPL-2.0 +# +# DMA engine configuration for sh +# + +config RENESAS_DMA + bool + select DMA_ENGINE + +# +# DMA Engine Helpers +# + +config SH_DMAE_BASE + bool "Renesas SuperH DMA Engine support" + depends on SUPERH || COMPILE_TEST + depends on !SUPERH || SH_DMA + depends on !SH_DMA_API + default SUPERH || SH_DMA + select RENESAS_DMA + help + Enable support for the Renesas SuperH DMA controllers. + +# +# DMA Controllers +# + +config SH_DMAE + tristate "Renesas SuperH DMAC support" + depends on SH_DMAE_BASE + help + Enable support for the Renesas SuperH DMA controllers. + +config RCAR_DMAC + tristate "Renesas R-Car Gen{2,3} and RZ/G{1,2} DMA Controller" + depends on ARCH_RENESAS || COMPILE_TEST + select RENESAS_DMA + help + This driver supports the general purpose DMA controller found in the + Renesas R-Car Gen{2,3} and RZ/G{1,2} SoCs. + +config RENESAS_USB_DMAC + tristate "Renesas USB-DMA Controller" + depends on ARCH_RENESAS || COMPILE_TEST + select RENESAS_DMA + select DMA_VIRTUAL_CHANNELS + help + This driver supports the USB-DMA controller found in the Renesas + SoCs. + +config RZ_DMAC + tristate "Renesas RZ DMA Controller" + depends on ARCH_RENESAS || COMPILE_TEST + select RENESAS_DMA + select DMA_VIRTUAL_CHANNELS + help + This driver supports the general purpose DMA controller typically + found in the Renesas RZ SoC variants. -- cgit v1.3.1