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/mfd/tps65912-i2c.c | 63 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 63 insertions(+) create mode 100644 drivers/mfd/tps65912-i2c.c (limited to 'drivers/mfd/tps65912-i2c.c') diff --git a/drivers/mfd/tps65912-i2c.c b/drivers/mfd/tps65912-i2c.c new file mode 100644 index 000000000..138e50497 --- /dev/null +++ b/drivers/mfd/tps65912-i2c.c @@ -0,0 +1,63 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * I2C access driver for TI TPS65912x PMICs + * + * Copyright (C) 2015 Texas Instruments Incorporated - https://www.ti.com/ + * Andrew F. Davis + * + * Based on the TPS65218 driver and the previous TPS65912 driver by + * Margarita Olaya Cabrera + */ + +#include +#include +#include + +#include + +static const struct of_device_id tps65912_i2c_of_match_table[] = { + { .compatible = "ti,tps65912", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, tps65912_i2c_of_match_table); + +static int tps65912_i2c_probe(struct i2c_client *client) +{ + struct tps65912 *tps; + + tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL); + if (!tps) + return -ENOMEM; + + i2c_set_clientdata(client, tps); + tps->dev = &client->dev; + tps->irq = client->irq; + + tps->regmap = devm_regmap_init_i2c(client, &tps65912_regmap_config); + if (IS_ERR(tps->regmap)) { + dev_err(tps->dev, "Failed to initialize register map\n"); + return PTR_ERR(tps->regmap); + } + + return tps65912_device_init(tps); +} + +static const struct i2c_device_id tps65912_i2c_id_table[] = { + { "tps65912" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(i2c, tps65912_i2c_id_table); + +static struct i2c_driver tps65912_i2c_driver = { + .driver = { + .name = "tps65912", + .of_match_table = tps65912_i2c_of_match_table, + }, + .probe = tps65912_i2c_probe, + .id_table = tps65912_i2c_id_table, +}; +module_i2c_driver(tps65912_i2c_driver); + +MODULE_AUTHOR("Andrew F. Davis "); +MODULE_DESCRIPTION("TPS65912x I2C Interface Driver"); +MODULE_LICENSE("GPL v2"); -- cgit v1.3.1