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/mtd/hyperbus/Kconfig | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) create mode 100644 drivers/mtd/hyperbus/Kconfig (limited to 'drivers/mtd/hyperbus/Kconfig') diff --git a/drivers/mtd/hyperbus/Kconfig b/drivers/mtd/hyperbus/Kconfig new file mode 100644 index 000000000..30ffc4c16 --- /dev/null +++ b/drivers/mtd/hyperbus/Kconfig @@ -0,0 +1,32 @@ +menuconfig MTD_HYPERBUS + tristate "HyperBus support" + depends on HAS_IOMEM + select MTD_CFI + select MTD_MAP_BANK_WIDTH_2 + select MTD_CFI_AMDSTD + select MTD_COMPLEX_MAPPINGS + help + This is the framework for the HyperBus which can be used by + the HyperBus Controller driver to communicate with + HyperFlash. See Cypress HyperBus specification for more + details + +if MTD_HYPERBUS + +config HBMC_AM654 + tristate "HyperBus controller driver for AM65x SoC" + depends on ARCH_K3 || COMPILE_TEST + select MULTIPLEXER + imply MUX_MMIO + help + This is the driver for HyperBus controller on TI's AM65x and + other SoCs + +config RPCIF_HYPERBUS + tristate "Renesas RPC-IF HyperBus driver" + depends on RENESAS_RPCIF + depends on MTD_CFI_BE_BYTE_SWAP + help + This option includes Renesas RPC-IF HyperBus support. + +endif # MTD_HYPERBUS -- cgit v1.3.1