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/ceph/auth_x.h | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 54 insertions(+) create mode 100644 net/ceph/auth_x.h (limited to 'net/ceph/auth_x.h') diff --git a/net/ceph/auth_x.h b/net/ceph/auth_x.h new file mode 100644 index 000000000..c03735f96 --- /dev/null +++ b/net/ceph/auth_x.h @@ -0,0 +1,54 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _FS_CEPH_AUTH_X_H +#define _FS_CEPH_AUTH_X_H + +#include + +#include + +#include "crypto.h" +#include "auth_x_protocol.h" + +/* + * Handle ticket for a single service. + */ +struct ceph_x_ticket_handler { + struct rb_node node; + unsigned int service; + + struct ceph_crypto_key session_key; + bool have_key; + + u64 secret_id; + struct ceph_buffer *ticket_blob; + + time64_t renew_after, expires; +}; + +#define CEPHX_AU_ENC_BUF_LEN 128 /* big enough for encrypted blob */ + +struct ceph_x_authorizer { + struct ceph_authorizer base; + struct ceph_crypto_key session_key; + struct ceph_buffer *buf; + unsigned int service; + u64 nonce; + u64 secret_id; + char enc_buf[CEPHX_AU_ENC_BUF_LEN] __aligned(8); +}; + +struct ceph_x_info { + struct ceph_crypto_key secret; + + bool starting; + u64 server_challenge; + + unsigned int have_keys; + struct rb_root ticket_handlers; + + struct ceph_x_authorizer auth_authorizer; +}; + +int ceph_x_init(struct ceph_auth_client *ac); + +#endif -- cgit v1.3.1