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/acpi/sbshc.h | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) create mode 100644 drivers/acpi/sbshc.h (limited to 'drivers/acpi/sbshc.h') diff --git a/drivers/acpi/sbshc.h b/drivers/acpi/sbshc.h new file mode 100644 index 000000000..695c390e2 --- /dev/null +++ b/drivers/acpi/sbshc.h @@ -0,0 +1,32 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +struct acpi_smb_hc; +enum acpi_smb_protocol { + SMBUS_WRITE_QUICK = 2, + SMBUS_READ_QUICK = 3, + SMBUS_SEND_BYTE = 4, + SMBUS_RECEIVE_BYTE = 5, + SMBUS_WRITE_BYTE = 6, + SMBUS_READ_BYTE = 7, + SMBUS_WRITE_WORD = 8, + SMBUS_READ_WORD = 9, + SMBUS_WRITE_BLOCK = 0xa, + SMBUS_READ_BLOCK = 0xb, + SMBUS_PROCESS_CALL = 0xc, + SMBUS_BLOCK_PROCESS_CALL = 0xd, +}; + +enum acpi_sbs_device_addr { + ACPI_SBS_CHARGER = 0x9, + ACPI_SBS_MANAGER = 0xa, + ACPI_SBS_BATTERY = 0xb, +}; + +typedef void (*smbus_alarm_callback)(void *context); + +extern int acpi_smbus_read(struct acpi_smb_hc *hc, u8 protocol, u8 address, + u8 command, u8 *data); +extern int acpi_smbus_write(struct acpi_smb_hc *hc, u8 protocol, u8 slave_address, + u8 command, u8 *data, u8 length); +extern int acpi_smbus_register_callback(struct acpi_smb_hc *hc, + smbus_alarm_callback callback, void *context); +extern int acpi_smbus_unregister_callback(struct acpi_smb_hc *hc); -- cgit v1.3.1