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-mt6397.c | 61 +++++++++++++++++++++++++++++++ 1 file changed, 61 insertions(+) create mode 100644 drivers/pinctrl/mediatek/pinctrl-mt6397.c (limited to 'drivers/pinctrl/mediatek/pinctrl-mt6397.c') diff --git a/drivers/pinctrl/mediatek/pinctrl-mt6397.c b/drivers/pinctrl/mediatek/pinctrl-mt6397.c new file mode 100644 index 000000000..03d0f65d7 --- /dev/null +++ b/drivers/pinctrl/mediatek/pinctrl-mt6397.c @@ -0,0 +1,61 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2015 MediaTek Inc. + * Author: Hongzhou.Yang + */ + +#include +#include +#include +#include +#include +#include + +#include "pinctrl-mtk-common.h" +#include "pinctrl-mtk-mt6397.h" + +#define MT6397_PIN_REG_BASE 0xc000 + +static const struct mtk_pinctrl_devdata mt6397_pinctrl_data = { + .pins = mtk_pins_mt6397, + .npins = ARRAY_SIZE(mtk_pins_mt6397), + .dir_offset = (MT6397_PIN_REG_BASE + 0x000), + .ies_offset = MTK_PINCTRL_NOT_SUPPORT, + .smt_offset = MTK_PINCTRL_NOT_SUPPORT, + .pullen_offset = (MT6397_PIN_REG_BASE + 0x020), + .pullsel_offset = (MT6397_PIN_REG_BASE + 0x040), + .dout_offset = (MT6397_PIN_REG_BASE + 0x080), + .din_offset = (MT6397_PIN_REG_BASE + 0x0a0), + .pinmux_offset = (MT6397_PIN_REG_BASE + 0x0c0), + .type1_start = 41, + .type1_end = 41, + .port_shf = 3, + .port_mask = 0x3, + .port_align = 2, + .mode_mask = 0xf, + .mode_per_reg = 5, + .mode_shf = 4, +}; + +static int mt6397_pinctrl_probe(struct platform_device *pdev) +{ + struct mt6397_chip *mt6397; + + mt6397 = dev_get_drvdata(pdev->dev.parent); + return mtk_pctrl_init(pdev, &mt6397_pinctrl_data, mt6397->regmap); +} + +static const struct of_device_id mt6397_pctrl_match[] = { + { .compatible = "mediatek,mt6397-pinctrl", }, + { } +}; + +static struct platform_driver mtk_pinctrl_driver = { + .probe = mt6397_pinctrl_probe, + .driver = { + .name = "mediatek-mt6397-pinctrl", + .of_match_table = mt6397_pctrl_match, + }, +}; + +builtin_platform_driver(mtk_pinctrl_driver); -- cgit v1.3.1