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/pinctrl/mediatek/pinctrl-rt2880.c | 61 +++++++++++++++++++++++++++++++ 1 file changed, 61 insertions(+) create mode 100644 drivers/pinctrl/mediatek/pinctrl-rt2880.c (limited to 'drivers/pinctrl/mediatek/pinctrl-rt2880.c') diff --git a/drivers/pinctrl/mediatek/pinctrl-rt2880.c b/drivers/pinctrl/mediatek/pinctrl-rt2880.c new file mode 100644 index 000000000..e0366721a --- /dev/null +++ b/drivers/pinctrl/mediatek/pinctrl-rt2880.c @@ -0,0 +1,61 @@ +// SPDX-License-Identifier: GPL-2.0-only + +#include +#include +#include +#include +#include "pinctrl-mtmips.h" + +#define RT2880_GPIO_MODE_I2C BIT(0) +#define RT2880_GPIO_MODE_UART0 BIT(1) +#define RT2880_GPIO_MODE_SPI BIT(2) +#define RT2880_GPIO_MODE_UART1 BIT(3) +#define RT2880_GPIO_MODE_JTAG BIT(4) +#define RT2880_GPIO_MODE_MDIO BIT(5) +#define RT2880_GPIO_MODE_SDRAM BIT(6) +#define RT2880_GPIO_MODE_PCI BIT(7) + +static struct mtmips_pmx_func i2c_grp[] = { FUNC("i2c", 0, 1, 2) }; +static struct mtmips_pmx_func spi_grp[] = { FUNC("spi", 0, 3, 4) }; +static struct mtmips_pmx_func uartlite_grp[] = { FUNC("uartlite", 0, 7, 8) }; +static struct mtmips_pmx_func jtag_grp[] = { FUNC("jtag", 0, 17, 5) }; +static struct mtmips_pmx_func mdio_grp[] = { FUNC("mdio", 0, 22, 2) }; +static struct mtmips_pmx_func sdram_grp[] = { FUNC("sdram", 0, 24, 16) }; +static struct mtmips_pmx_func pci_grp[] = { FUNC("pci", 0, 40, 32) }; + +static struct mtmips_pmx_group rt2880_pinmux_data_act[] = { + GRP("i2c", i2c_grp, 1, RT2880_GPIO_MODE_I2C), + GRP("spi", spi_grp, 1, RT2880_GPIO_MODE_SPI), + GRP("uartlite", uartlite_grp, 1, RT2880_GPIO_MODE_UART0), + GRP("jtag", jtag_grp, 1, RT2880_GPIO_MODE_JTAG), + GRP("mdio", mdio_grp, 1, RT2880_GPIO_MODE_MDIO), + GRP("sdram", sdram_grp, 1, RT2880_GPIO_MODE_SDRAM), + GRP("pci", pci_grp, 1, RT2880_GPIO_MODE_PCI), + { 0 } +}; + +static int rt2880_pinctrl_probe(struct platform_device *pdev) +{ + return mtmips_pinctrl_init(pdev, rt2880_pinmux_data_act); +} + +static const struct of_device_id rt2880_pinctrl_match[] = { + { .compatible = "ralink,rt2880-pinctrl" }, + { .compatible = "ralink,rt2880-pinmux" }, + {} +}; +MODULE_DEVICE_TABLE(of, rt2880_pinctrl_match); + +static struct platform_driver rt2880_pinctrl_driver = { + .probe = rt2880_pinctrl_probe, + .driver = { + .name = "rt2880-pinctrl", + .of_match_table = rt2880_pinctrl_match, + }, +}; + +static int __init rt2880_pinctrl_init(void) +{ + return platform_driver_register(&rt2880_pinctrl_driver); +} +core_initcall_sync(rt2880_pinctrl_init); -- cgit v1.3.1