From a5f7a5bb3b7f28ba7e4fa246775b29a0e5537255 Mon Sep 17 00:00:00 2001 From: Jinke Han Date: Tue, 8 Sep 2026 15:37:42 +0800 Subject: x86/kprobes: Fix crash when probing CS CALL instructions When using eBPF to probe CS CALL instructions within a function, a crash can be triggered. The eBPF tool probes offset 257 of the __hrtimer_run_queues() function: <__hrtimer_run_queues+249>: nopl 0x0(%rax,%rax,1) <__hrtimer_run_queues+254>: mov %r14,%rdi <__hrtimer_run_queues+257>: cs call <__x86_indirect_thunk_r12> <__hrtimer_run_queues+263>: mov %eax,%r12d <__hrtimer_run_queues+266>: xchg %ax,%ax <__hrtimer_run_queues+268>: mov %r13,%rdi Which triggers this crash: BUG: unable to handle page fault for address: 00000000000f41c9 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 0 P4D 0 Oops: 0002 [#1] SMP NOPTI CPU: 1 PID: 0 Comm: swapper/1 Kdump: loaded Tainted: P RIP: 0010:__hrtimer_run_queues+0x106/0x230 Note that __hrtimer_run_queues+0x106 is __hrtimer_run_queues+262, which is at the 6th byte of the above CS CALL instruction. Since the CS CALL instruction occupies 6 bytes, the exception occurred in the middle of that call instruction. The root cause is that when using eBPF tools to probe in the middle of a function, a kprobe with INT3 is used as the underlying implementation. During single-step emulation of the original CALL instruction, int3_emulate_call() assumes that the probed CALL instruction is 5 bytes long. However, the actual CS-prefixed CALL instruction occupies 6 bytes, so it constructs an incorrect exception return address. When the CPU returns from the kprobe handler, the next instruction to be executed is at the address of the last byte of that CS CALL instruction. Coincidentally, starting from that address, the CPU fetches and decodes a completely different instruction, which ultimately triggers a kernel crash. Fix the issue by using the actual instruction length obtained from the instruction decoder when constructing the exception return address, rather than relying on the hardcoded CALL_INSN_SIZE macro. [ mingo: Refined the changelog ] Fixes: 6256e668b7af ("x86/kprobes: Use int3 instead of debug trap for single-step") Suggested-by: Masami Hiramatsu (Google) Signed-off-by: Jinke Han Signed-off-by: Ingo Molnar Reviewed-by: Masami Hiramatsu (Google) Acked-by: Yafang Shao Acked-by: Borislav Petkov Cc: Peter Zijlstra Link: https://patch.msgid.link/20260908073742.GA10517@didi-ThinkCentre-M920t-N000 --- drivers/bluetooth/btqca.h | 205 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 205 insertions(+) create mode 100644 drivers/bluetooth/btqca.h (limited to 'drivers/bluetooth/btqca.h') diff --git a/drivers/bluetooth/btqca.h b/drivers/bluetooth/btqca.h new file mode 100644 index 000000000..8f3c1b1c7 --- /dev/null +++ b/drivers/bluetooth/btqca.h @@ -0,0 +1,205 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Bluetooth supports for Qualcomm Atheros ROME chips + * + * Copyright (c) 2015 The Linux Foundation. All rights reserved. + */ + +#define EDL_PATCH_CMD_OPCODE 0xFC00 +#define EDL_NVM_ACCESS_OPCODE 0xFC0B +#define EDL_WRITE_BD_ADDR_OPCODE 0xFC14 +#define EDL_PATCH_CMD_LEN 1 +#define EDL_PATCH_VER_REQ_CMD 0x19 +#define EDL_PATCH_TLV_REQ_CMD 0x1E +#define EDL_GET_BUILD_INFO_CMD 0x20 +#define EDL_GET_BID_REQ_CMD 0x23 +#define EDL_NVM_ACCESS_SET_REQ_CMD 0x01 +#define EDL_PATCH_CONFIG_CMD 0x28 +#define MAX_SIZE_PER_TLV_SEGMENT 243 +#define QCA_PRE_SHUTDOWN_CMD 0xFC08 +#define QCA_DISABLE_LOGGING 0xFC17 + +#define EDL_CMD_REQ_RES_EVT 0x00 +#define EDL_PATCH_VER_RES_EVT 0x19 +#define EDL_APP_VER_RES_EVT 0x02 +#define EDL_TVL_DNLD_RES_EVT 0x04 +#define EDL_CMD_EXE_STATUS_EVT 0x00 +#define EDL_SET_BAUDRATE_RSP_EVT 0x92 +#define EDL_NVM_ACCESS_CODE_EVT 0x0B +#define EDL_PATCH_CONFIG_RES_EVT 0x00 +#define QCA_DISABLE_LOGGING_SUB_OP 0x14 + +#define EDL_TAG_ID_BD_ADDR 2 +#define EDL_TAG_ID_HCI 17 +#define EDL_TAG_ID_DEEP_SLEEP 27 + +#define QCA_WCN3990_POWERON_PULSE 0xFC +#define QCA_WCN3990_POWEROFF_PULSE 0xC0 + +#define QCA_HCI_CC_OPCODE 0xFC00 +#define QCA_HCI_CC_SUCCESS 0x00 + +#define QCA_WCN3991_SOC_ID 0x40014320 + +#define QCA_WCN3950_SOC_ID_T 0x40074130 +#define QCA_WCN3950_SOC_ID_S 0x40075130 + +/* QCA chipset version can be decided by patch and SoC + * version, combination with upper 2 bytes from SoC + * and lower 2 bytes from patch will be used. + */ +#define get_soc_ver(soc_id, rom_ver) \ + ((le32_to_cpu(soc_id) << 16) | (le16_to_cpu(rom_ver))) + +#define QCA_HSP_GF_SOC_ID 0x1200 +#define QCA_HSP_GF_SOC_MASK 0x0000ff00 + +enum qca_baudrate { + QCA_BAUDRATE_115200 = 0, + QCA_BAUDRATE_57600, + QCA_BAUDRATE_38400, + QCA_BAUDRATE_19200, + QCA_BAUDRATE_9600, + QCA_BAUDRATE_230400, + QCA_BAUDRATE_250000, + QCA_BAUDRATE_460800, + QCA_BAUDRATE_500000, + QCA_BAUDRATE_720000, + QCA_BAUDRATE_921600, + QCA_BAUDRATE_1000000, + QCA_BAUDRATE_1250000, + QCA_BAUDRATE_2000000, + QCA_BAUDRATE_3000000, + QCA_BAUDRATE_4000000, + QCA_BAUDRATE_1600000, + QCA_BAUDRATE_3200000, + QCA_BAUDRATE_3500000, + QCA_BAUDRATE_AUTO = 0xFE, + QCA_BAUDRATE_RESERVED +}; + +enum qca_tlv_dnld_mode { + QCA_SKIP_EVT_NONE, + QCA_SKIP_EVT_VSE, + QCA_SKIP_EVT_CC, + QCA_SKIP_EVT_VSE_CC +}; + +enum qca_tlv_type { + TLV_TYPE_PATCH = 1, + TLV_TYPE_NVM, + ELF_TYPE_PATCH, +}; + +struct qca_fw_config { + u8 type; + char fwname[64]; + uint8_t user_baud_rate; + enum qca_tlv_dnld_mode dnld_mode; + enum qca_tlv_dnld_mode dnld_type; + bdaddr_t bdaddr; +}; + +struct edl_event_hdr { + __u8 cresp; + __u8 rtype; + __u8 data[]; +} __packed; + +struct qca_btsoc_version { + __le32 product_id; + __le16 patch_ver; + __le16 rom_ver; + __le32 soc_id; +} __packed; + +struct tlv_seg_resp { + __u8 result; +} __packed; + +struct tlv_type_patch { + __le32 total_size; + __le32 data_length; + __u8 format_version; + __u8 signature; + __u8 download_mode; + __u8 reserved1; + __le16 product_id; + __le16 rom_build; + __le16 patch_version; + __le16 reserved2; + __le32 entry; +} __packed; + +struct tlv_type_nvm { + __le16 tag_id; + __le16 tag_len; + __le32 reserve1; + __le32 reserve2; + __u8 data[]; +} __packed; + +struct tlv_type_hdr { + __le32 type_len; + __u8 data[]; +} __packed; + +enum qca_btsoc_type { + QCA_INVALID = -1, + QCA_AR3002, + QCA_ROME, + QCA_WCN3950, + QCA_WCN3988, + QCA_WCN3990, + QCA_WCN3998, + QCA_WCN3991, + QCA_QCA2066, + QCA_QCA6390, + QCA_WCN6750, + QCA_WCN6855, + QCA_WCN7850, +}; + +#if IS_ENABLED(CONFIG_BT_QCA) + +int qca_set_bdaddr_rome(struct hci_dev *hdev, const bdaddr_t *bdaddr); +int qca_uart_setup(struct hci_dev *hdev, uint8_t baudrate, + enum qca_btsoc_type soc_type, struct qca_btsoc_version ver, + const char *firmware_name, const char *rampatch_name); +int qca_read_soc_version(struct hci_dev *hdev, struct qca_btsoc_version *ver, + enum qca_btsoc_type); +int qca_set_bdaddr(struct hci_dev *hdev, const bdaddr_t *bdaddr); +int qca_send_pre_shutdown_cmd(struct hci_dev *hdev); +#else + +static inline int qca_set_bdaddr_rome(struct hci_dev *hdev, const bdaddr_t *bdaddr) +{ + return -EOPNOTSUPP; +} + +static inline int qca_uart_setup(struct hci_dev *hdev, uint8_t baudrate, + enum qca_btsoc_type soc_type, + struct qca_btsoc_version ver, + const char *firmware_name, + const char *rampatch_name) +{ + return -EOPNOTSUPP; +} + +static inline int qca_read_soc_version(struct hci_dev *hdev, + struct qca_btsoc_version *ver, + enum qca_btsoc_type) +{ + return -EOPNOTSUPP; +} + +static inline int qca_set_bdaddr(struct hci_dev *hdev, const bdaddr_t *bdaddr) +{ + return -EOPNOTSUPP; +} + +static inline int qca_send_pre_shutdown_cmd(struct hci_dev *hdev) +{ + return -EOPNOTSUPP; +} +#endif -- cgit v1.3.1