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inotify: Add flag IN_MASK_CREATE for inotify_add_watch()
The flag IN_MASK_CREATE is introduced as a flag for inotiy_add_watch() which prevents inotify from modifying any existing watches when invoked. If the pathname specified in the call has a watched inode associated with it and IN_MASK_CREATE is specified, fail with an errno of EEXIST. Use of IN_MASK_CREATE with IN_MASK_ADD is reserved for future use and will return EINVAL. RATIONALE In the current implementation, there is no way to prevent inotify_add_watch() from modifying existing watch descriptors. Even if the caller keeps a record of all watch descriptors collected, this is only sufficient to detect that an existing watch descriptor may have been modified. The assumption that a particular path will map to the same inode over multiple calls to inotify_add_watch() cannot be made as files can be renamed or deleted. It is also not possible to assume that two distinct paths do no map to the same inode, due to hard-links or a dereferenced symbolic link. Further uses of inotify_add_watch() to revert the change may cause other watch descriptors to be modified or created, merely compunding the problem. There is currently no system call such as inotify_modify_watch() to explicity modify a watch descriptor, which would be able to revert unwanted changes. Thus the caller cannot guarantee to be able to revert any changes to existing watch decriptors. Additionally the caller cannot assume that the events that are associated with a watch descriptor are within the set requested, as any future calls to inotify_add_watch() may unintentionally modify a watch descriptor's mask. Thus it cannot currently be guaranteed that a watch descriptor will only generate events which have been requested. The program must filter events which come through its watch descriptor to within its expected range. Reviewed-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Henry Wilson <henry.wilson@acentic.com> Signed-off-by: Jan Kara <jack@suse.cz>
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@ -510,6 +510,7 @@ static int inotify_update_existing_watch(struct fsnotify_group *group,
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__u32 old_mask, new_mask;
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__u32 mask;
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int add = (arg & IN_MASK_ADD);
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int create = (arg & IN_MASK_CREATE);
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int ret;
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mask = inotify_arg_to_mask(arg);
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@ -517,6 +518,8 @@ static int inotify_update_existing_watch(struct fsnotify_group *group,
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fsn_mark = fsnotify_find_mark(&inode->i_fsnotify_marks, group);
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if (!fsn_mark)
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return -ENOENT;
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else if (create)
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return -EEXIST;
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i_mark = container_of(fsn_mark, struct inotify_inode_mark, fsn_mark);
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@ -718,6 +721,10 @@ SYSCALL_DEFINE3(inotify_add_watch, int, fd, const char __user *, pathname,
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if (unlikely(!f.file))
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return -EBADF;
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/* IN_MASK_ADD and IN_MASK_CREATE don't make sense together */
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if (unlikely((mask & IN_MASK_ADD) && (mask & IN_MASK_CREATE)))
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return -EINVAL;
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/* verify that this is indeed an inotify instance */
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if (unlikely(f.file->f_op != &inotify_fops)) {
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ret = -EINVAL;
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@ -806,7 +813,7 @@ static int __init inotify_user_setup(void)
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BUILD_BUG_ON(IN_ISDIR != FS_ISDIR);
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BUILD_BUG_ON(IN_ONESHOT != FS_IN_ONESHOT);
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BUG_ON(hweight32(ALL_INOTIFY_BITS) != 21);
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BUG_ON(hweight32(ALL_INOTIFY_BITS) != 22);
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inotify_inode_mark_cachep = KMEM_CACHE(inotify_inode_mark, SLAB_PANIC);
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@ -18,6 +18,6 @@ extern struct ctl_table inotify_table[]; /* for sysctl */
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IN_DELETE_SELF | IN_MOVE_SELF | IN_UNMOUNT | \
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IN_Q_OVERFLOW | IN_IGNORED | IN_ONLYDIR | \
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IN_DONT_FOLLOW | IN_EXCL_UNLINK | IN_MASK_ADD | \
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IN_ISDIR | IN_ONESHOT)
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IN_MASK_CREATE | IN_ISDIR | IN_ONESHOT)
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#endif /* _LINUX_INOTIFY_H */
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@ -53,6 +53,7 @@ struct inotify_event {
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#define IN_ONLYDIR 0x01000000 /* only watch the path if it is a directory */
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#define IN_DONT_FOLLOW 0x02000000 /* don't follow a sym link */
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#define IN_EXCL_UNLINK 0x04000000 /* exclude events on unlinked objects */
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#define IN_MASK_CREATE 0x10000000 /* only create watches */
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#define IN_MASK_ADD 0x20000000 /* add to the mask of an already existing watch */
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#define IN_ISDIR 0x40000000 /* event occurred against dir */
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#define IN_ONESHOT 0x80000000 /* only send event once */
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