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 --- sound/spi/Kconfig | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) create mode 100644 sound/spi/Kconfig (limited to 'sound/spi/Kconfig') diff --git a/sound/spi/Kconfig b/sound/spi/Kconfig new file mode 100644 index 000000000..f407c37c3 --- /dev/null +++ b/sound/spi/Kconfig @@ -0,0 +1,39 @@ +# SPDX-License-Identifier: GPL-2.0-only +#SPI drivers + +menuconfig SND_SPI + bool "SPI sound devices" + depends on SPI + default y + help + Support for sound devices connected via the SPI bus. + +if SND_SPI + +config SND_AT73C213 + tristate "Atmel AT73C213 DAC driver" + depends on ATMEL_SSC + select SND_PCM + help + Say Y here if you want to use the Atmel AT73C213 external DAC. This + DAC can be found on Atmel development boards. + + This driver requires the Atmel SSC driver for sound sink, a + peripheral found on most AT91 microprocessors. + + To compile this driver as a module, choose M here: the module will be + called snd-at73c213. + +config SND_AT73C213_TARGET_BITRATE + int "Target bitrate for AT73C213" + depends on SND_AT73C213 + default "48000" + range 8000 50000 + help + Sets the target bitrate for the bitrate calculator in the driver. + Limited by hardware to be between 8000 Hz and 50000 Hz. + + Set to 48000 Hz by default. + +endif # SND_SPI + -- cgit v1.3.1