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/clk/mediatek/clk-mt6765-vcodec.c | 57 ++++++++++++++++++++++++++++++++ 1 file changed, 57 insertions(+) create mode 100644 drivers/clk/mediatek/clk-mt6765-vcodec.c (limited to 'drivers/clk/mediatek/clk-mt6765-vcodec.c') diff --git a/drivers/clk/mediatek/clk-mt6765-vcodec.c b/drivers/clk/mediatek/clk-mt6765-vcodec.c new file mode 100644 index 000000000..f309d1090 --- /dev/null +++ b/drivers/clk/mediatek/clk-mt6765-vcodec.c @@ -0,0 +1,57 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2018 MediaTek Inc. + * Author: Owen Chen + */ + +#include +#include + +#include "clk-mtk.h" +#include "clk-gate.h" + +#include + +static const struct mtk_gate_regs venc_cg_regs = { + .set_ofs = 0x4, + .clr_ofs = 0x8, + .sta_ofs = 0x0, +}; + +#define GATE_VENC(_id, _name, _parent, _shift) \ + GATE_MTK(_id, _name, _parent, &venc_cg_regs, _shift, &mtk_clk_gate_ops_setclr_inv) + +static const struct mtk_gate venc_clks[] = { + GATE_VENC(CLK_VENC_SET0_LARB, "venc_set0_larb", "mm_ck", 0), + GATE_VENC(CLK_VENC_SET1_VENC, "venc_set1_venc", "mm_ck", 4), + GATE_VENC(CLK_VENC_SET2_JPGENC, "jpgenc", "mm_ck", 8), + GATE_VENC(CLK_VENC_SET3_VDEC, "venc_set3_vdec", "mm_ck", 12), +}; + +static const struct mtk_clk_desc venc_desc = { + .clks = venc_clks, + .num_clks = ARRAY_SIZE(venc_clks), +}; + +static const struct of_device_id of_match_clk_mt6765_vcodec[] = { + { + .compatible = "mediatek,mt6765-vcodecsys", + .data = &venc_desc, + }, { + /* sentinel */ + } +}; +MODULE_DEVICE_TABLE(of, of_match_clk_mt6765_vcodec); + +static struct platform_driver clk_mt6765_vcodec_drv = { + .probe = mtk_clk_simple_probe, + .remove = mtk_clk_simple_remove, + .driver = { + .name = "clk-mt6765-vcodec", + .of_match_table = of_match_clk_mt6765_vcodec, + }, +}; +module_platform_driver(clk_mt6765_vcodec_drv); + +MODULE_DESCRIPTION("MediaTek MT6765 Video Codec clocks driver"); +MODULE_LICENSE("GPL"); -- cgit v1.3.1