From 4617721c502b2ddaa4e324e86da4997edf738fa5 Mon Sep 17 00:00:00 2001 From: Steven Rostedt Date: Wed, 2 Sep 2026 09:55:01 -0400 Subject: ftrace: Synchronize the initialization of ftrace_ops There's some internal state that ftrace_ops needs to have set, but since it can be declared outside of the ftrace.c code, it calls ftrace_ops_init() on the ops in every global function. The issue is that if two tasks call it on the same ops at the same time it is possible to have the initialization of one corrupt the initialization of the other call. Create a ops_mutex to use to synchronize every initialization of the ftrace_ops. The mutex is taken within checking the ftrace_ops flag that states it was initializied but the flag is checked again after the mutex has been taken. Checking first outside the mutex allows it to shortcut having to take the mutex. But then the check needs to be done again after the mute is taken in case of races. Cc: stable@vger.kernel.org Link: https://patch.msgid.link/20260902095501.6b59af20@gandalf.local.home Fixes: f04f24fb7e48d ("ftrace, kprobes: Fix a deadlock on ftrace_regex_lock") Reported-by: sashiko-bot@kernel.org Close: https://lore.kernel.org/all/20260829025528.49A831F000E9@smtp.kernel.org/ Signed-off-by: Steven Rostedt --- net/bluetooth/eir.h | 99 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 99 insertions(+) create mode 100644 net/bluetooth/eir.h (limited to 'net/bluetooth/eir.h') diff --git a/net/bluetooth/eir.h b/net/bluetooth/eir.h new file mode 100644 index 000000000..9372db83f --- /dev/null +++ b/net/bluetooth/eir.h @@ -0,0 +1,99 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * BlueZ - Bluetooth protocol stack for Linux + * + * Copyright (C) 2021 Intel Corporation + */ + +#include + +void eir_create(struct hci_dev *hdev, u8 *data); + +u8 eir_create_adv_data(struct hci_dev *hdev, u8 instance, u8 *ptr, u8 size); +u8 eir_create_scan_rsp(struct hci_dev *hdev, u8 instance, u8 *ptr); +u8 eir_create_per_adv_data(struct hci_dev *hdev, u8 instance, u8 *ptr); + +u8 eir_append_local_name(struct hci_dev *hdev, u8 *eir, u8 ad_len); +u8 eir_append_appearance(struct hci_dev *hdev, u8 *ptr, u8 ad_len); +u8 eir_append_service_data(u8 *eir, u16 eir_len, u16 uuid, u8 *data, + u8 data_len); + +static inline u16 eir_precalc_len(u8 data_len) +{ + return sizeof(u8) * 2 + data_len; +} + +static inline u16 eir_append_data(u8 *eir, u16 eir_len, u8 type, + u8 *data, u8 data_len) +{ + eir[eir_len++] = sizeof(type) + data_len; + eir[eir_len++] = type; + memcpy(&eir[eir_len], data, data_len); + eir_len += data_len; + + return eir_len; +} + +static inline u16 eir_append_le16(u8 *eir, u16 eir_len, u8 type, u16 data) +{ + eir[eir_len++] = sizeof(type) + sizeof(data); + eir[eir_len++] = type; + put_unaligned_le16(data, &eir[eir_len]); + eir_len += sizeof(data); + + return eir_len; +} + +static inline u16 eir_skb_put_data(struct sk_buff *skb, u8 type, u8 *data, u8 data_len) +{ + u8 *eir; + u16 eir_len; + + eir_len = eir_precalc_len(data_len); + eir = skb_put(skb, eir_len); + WARN_ON(sizeof(type) + data_len > U8_MAX); + eir[0] = sizeof(type) + data_len; + eir[1] = type; + memcpy(&eir[2], data, data_len); + + return eir_len; +} + +static inline void *eir_get_data(u8 *eir, size_t eir_len, u8 type, + size_t *data_len) +{ + size_t parsed = 0; + + if (eir_len < 2) + return NULL; + + while (parsed < eir_len - 1) { + u8 field_len = eir[0]; + + if (field_len == 0) + break; + + parsed += field_len + 1; + + if (parsed > eir_len) + break; + + if (eir[1] != type) { + eir += field_len + 1; + continue; + } + + /* Zero length data */ + if (field_len == 1) + return NULL; + + if (data_len) + *data_len = field_len - 1; + + return &eir[2]; + } + + return NULL; +} + +void *eir_get_service_data(u8 *eir, size_t eir_len, u16 uuid, size_t *len); -- cgit v1.3.1