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 --- fs/btrfs/ioctl.h | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 fs/btrfs/ioctl.h (limited to 'fs/btrfs/ioctl.h') diff --git a/fs/btrfs/ioctl.h b/fs/btrfs/ioctl.h new file mode 100644 index 000000000..ccf6bed9c --- /dev/null +++ b/fs/btrfs/ioctl.h @@ -0,0 +1,29 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#ifndef BTRFS_IOCTL_H +#define BTRFS_IOCTL_H + +#include + +struct file; +struct dentry; +struct mnt_idmap; +struct file_kattr; +struct io_uring_cmd; +struct btrfs_inode; +struct btrfs_fs_info; +struct btrfs_ioctl_balance_args; + +long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg); +long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg); +int btrfs_fileattr_get(struct dentry *dentry, struct file_kattr *fa); +int btrfs_fileattr_set(struct mnt_idmap *idmap, + struct dentry *dentry, struct file_kattr *fa); +int btrfs_ioctl_get_supported_features(void __user *arg); +void btrfs_sync_inode_flags_to_i_flags(struct btrfs_inode *inode); +void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info, + struct btrfs_ioctl_balance_args *bargs); +int btrfs_uring_cmd(struct io_uring_cmd *cmd, unsigned int issue_flags); +void btrfs_uring_read_extent_endio(void *ctx, int err); + +#endif -- cgit v1.3.1