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/ubifs/ioctl.c | 230 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 230 insertions(+) create mode 100644 fs/ubifs/ioctl.c (limited to 'fs/ubifs/ioctl.c') diff --git a/fs/ubifs/ioctl.c b/fs/ubifs/ioctl.c new file mode 100644 index 000000000..79536b2e3 --- /dev/null +++ b/fs/ubifs/ioctl.c @@ -0,0 +1,230 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * This file is part of UBIFS. + * + * Copyright (C) 2006-2008 Nokia Corporation. + * Copyright (C) 2006, 2007 University of Szeged, Hungary + * + * Authors: Zoltan Sogor + * Artem Bityutskiy (Битюцкий Артём) + * Adrian Hunter + */ + +/* This file implements EXT2-compatible extended attribute ioctl() calls */ + +#include +#include +#include +#include "ubifs.h" + +/* Need to be kept consistent with checked flags in ioctl2ubifs() */ +#define UBIFS_SETTABLE_IOCTL_FLAGS \ + (FS_COMPR_FL | FS_SYNC_FL | FS_APPEND_FL | \ + FS_IMMUTABLE_FL | FS_DIRSYNC_FL) + +/* Need to be kept consistent with checked flags in ubifs2ioctl() */ +#define UBIFS_GETTABLE_IOCTL_FLAGS \ + (UBIFS_SETTABLE_IOCTL_FLAGS | FS_ENCRYPT_FL) + +/** + * ubifs_set_inode_flags - set VFS inode flags. + * @inode: VFS inode to set flags for + * + * This function propagates flags from UBIFS inode object to VFS inode object. + */ +void ubifs_set_inode_flags(struct inode *inode) +{ + unsigned int flags = ubifs_inode(inode)->flags; + + inode->i_flags &= ~(S_SYNC | S_APPEND | S_IMMUTABLE | S_DIRSYNC | + S_ENCRYPTED); + if (flags & UBIFS_SYNC_FL) + inode->i_flags |= S_SYNC; + if (flags & UBIFS_APPEND_FL) + inode->i_flags |= S_APPEND; + if (flags & UBIFS_IMMUTABLE_FL) + inode->i_flags |= S_IMMUTABLE; + if (flags & UBIFS_DIRSYNC_FL) + inode->i_flags |= S_DIRSYNC; + if (flags & UBIFS_CRYPT_FL) + inode->i_flags |= S_ENCRYPTED; +} + +/* + * ioctl2ubifs - convert ioctl inode flags to UBIFS inode flags. + * @ioctl_flags: flags to convert + * + * This function converts ioctl flags (@FS_COMPR_FL, etc) to UBIFS inode flags + * (@UBIFS_COMPR_FL, etc). + */ +static int ioctl2ubifs(int ioctl_flags) +{ + int ubifs_flags = 0; + + if (ioctl_flags & FS_COMPR_FL) + ubifs_flags |= UBIFS_COMPR_FL; + if (ioctl_flags & FS_SYNC_FL) + ubifs_flags |= UBIFS_SYNC_FL; + if (ioctl_flags & FS_APPEND_FL) + ubifs_flags |= UBIFS_APPEND_FL; + if (ioctl_flags & FS_IMMUTABLE_FL) + ubifs_flags |= UBIFS_IMMUTABLE_FL; + if (ioctl_flags & FS_DIRSYNC_FL) + ubifs_flags |= UBIFS_DIRSYNC_FL; + + return ubifs_flags; +} + +/* + * ubifs2ioctl - convert UBIFS inode flags to ioctl inode flags. + * @ubifs_flags: flags to convert + * + * This function converts UBIFS inode flags (@UBIFS_COMPR_FL, etc) to ioctl + * flags (@FS_COMPR_FL, etc). + */ +static int ubifs2ioctl(int ubifs_flags) +{ + int ioctl_flags = 0; + + if (ubifs_flags & UBIFS_COMPR_FL) + ioctl_flags |= FS_COMPR_FL; + if (ubifs_flags & UBIFS_SYNC_FL) + ioctl_flags |= FS_SYNC_FL; + if (ubifs_flags & UBIFS_APPEND_FL) + ioctl_flags |= FS_APPEND_FL; + if (ubifs_flags & UBIFS_IMMUTABLE_FL) + ioctl_flags |= FS_IMMUTABLE_FL; + if (ubifs_flags & UBIFS_DIRSYNC_FL) + ioctl_flags |= FS_DIRSYNC_FL; + if (ubifs_flags & UBIFS_CRYPT_FL) + ioctl_flags |= FS_ENCRYPT_FL; + + return ioctl_flags; +} + +static int setflags(struct inode *inode, int flags) +{ + int err, release; + struct ubifs_inode *ui = ubifs_inode(inode); + struct ubifs_info *c = inode->i_sb->s_fs_info; + struct ubifs_budget_req req = { .dirtied_ino = 1, + .dirtied_ino_d = ALIGN(ui->data_len, 8) }; + + err = ubifs_budget_space(c, &req); + if (err) + return err; + + mutex_lock(&ui->ui_mutex); + ui->flags &= ~ioctl2ubifs(UBIFS_SETTABLE_IOCTL_FLAGS); + ui->flags |= ioctl2ubifs(flags); + ubifs_set_inode_flags(inode); + inode_set_ctime_current(inode); + release = ui->dirty; + mark_inode_dirty_sync(inode); + mutex_unlock(&ui->ui_mutex); + + if (release) + ubifs_release_budget(c, &req); + if (IS_SYNC(inode)) + err = write_inode_now(inode, 1); + return err; +} + +int ubifs_fileattr_get(struct dentry *dentry, struct file_kattr *fa) +{ + struct inode *inode = d_inode(dentry); + int flags = ubifs2ioctl(ubifs_inode(inode)->flags); + + if (d_is_special(dentry)) + return -ENOTTY; + + dbg_gen("get flags: %#x, i_flags %#x", flags, inode->i_flags); + fileattr_fill_flags(fa, flags); + + return 0; +} + +int ubifs_fileattr_set(struct mnt_idmap *idmap, + struct dentry *dentry, struct file_kattr *fa) +{ + struct inode *inode = d_inode(dentry); + int flags = fa->flags; + + if (d_is_special(dentry)) + return -ENOTTY; + + if (fileattr_has_fsx(fa)) + return -EOPNOTSUPP; + + if (flags & ~UBIFS_GETTABLE_IOCTL_FLAGS) + return -EOPNOTSUPP; + + flags &= UBIFS_SETTABLE_IOCTL_FLAGS; + + if (!S_ISDIR(inode->i_mode)) + flags &= ~FS_DIRSYNC_FL; + + dbg_gen("set flags: %#x, i_flags %#x", flags, inode->i_flags); + return setflags(inode, flags); +} + +long ubifs_ioctl(struct file *file, unsigned int cmd, unsigned long arg) +{ + int err; + struct inode *inode = file_inode(file); + + switch (cmd) { + case FS_IOC_SET_ENCRYPTION_POLICY: { + struct ubifs_info *c = inode->i_sb->s_fs_info; + + err = ubifs_enable_encryption(c); + if (err) + return err; + + return fscrypt_ioctl_set_policy(file, (const void __user *)arg); + } + case FS_IOC_GET_ENCRYPTION_POLICY: + return fscrypt_ioctl_get_policy(file, (void __user *)arg); + + case FS_IOC_GET_ENCRYPTION_POLICY_EX: + return fscrypt_ioctl_get_policy_ex(file, (void __user *)arg); + + case FS_IOC_ADD_ENCRYPTION_KEY: + return fscrypt_ioctl_add_key(file, (void __user *)arg); + + case FS_IOC_REMOVE_ENCRYPTION_KEY: + return fscrypt_ioctl_remove_key(file, (void __user *)arg); + + case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS: + return fscrypt_ioctl_remove_key_all_users(file, + (void __user *)arg); + case FS_IOC_GET_ENCRYPTION_KEY_STATUS: + return fscrypt_ioctl_get_key_status(file, (void __user *)arg); + + case FS_IOC_GET_ENCRYPTION_NONCE: + return fscrypt_ioctl_get_nonce(file, (void __user *)arg); + + default: + return -ENOTTY; + } +} + +#ifdef CONFIG_COMPAT +long ubifs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) +{ + switch (cmd) { + case FS_IOC_SET_ENCRYPTION_POLICY: + case FS_IOC_GET_ENCRYPTION_POLICY: + case FS_IOC_GET_ENCRYPTION_POLICY_EX: + case FS_IOC_ADD_ENCRYPTION_KEY: + case FS_IOC_REMOVE_ENCRYPTION_KEY: + case FS_IOC_REMOVE_ENCRYPTION_KEY_ALL_USERS: + case FS_IOC_GET_ENCRYPTION_KEY_STATUS: + case FS_IOC_GET_ENCRYPTION_NONCE: + break; + default: + return -ENOIOCTLCMD; + } + return ubifs_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); +} +#endif -- cgit v1.3.1