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| author | Eric Paris <eparis@redhat.com> | 2009-12-17 21:24:34 -0500 |
|---|---|---|
| committer | Eric Paris <eparis@redhat.com> | 2010-07-28 09:59:01 -0400 |
| commit | c4ec54b40d33f8016fea970a383cc584dd0e6019 (patch) | |
| tree | 8e8865170cf340d1e79dc379f56417588715b2c8 /include/linux/fsnotify.h | |
| parent | d14f1729483fad3a8817fbbcbd017678b7d1ad26 (diff) | |
| download | lwn-c4ec54b40d33f8016fea970a383cc584dd0e6019.tar.gz lwn-c4ec54b40d33f8016fea970a383cc584dd0e6019.zip | |
fsnotify: new fsnotify hooks and events types for access decisions
introduce a new fsnotify hook, fsnotify_perm(), which is called from the
security code. This hook is used to allow fsnotify groups to make access
control decisions about events on the system. We also must change the
generic fsnotify function to return an error code if we intend these hooks
to be in any way useful.
Signed-off-by: Eric Paris <eparis@redhat.com>
Diffstat (limited to 'include/linux/fsnotify.h')
| -rw-r--r-- | include/linux/fsnotify.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/include/linux/fsnotify.h b/include/linux/fsnotify.h index b8cf161f5a6d..64efda9aae62 100644 --- a/include/linux/fsnotify.h +++ b/include/linux/fsnotify.h @@ -34,6 +34,25 @@ static inline void fsnotify_parent(struct path *path, struct dentry *dentry, __u __fsnotify_parent(path, dentry, mask); } +/* simple call site for access decisions */ +static inline int fsnotify_perm(struct file *file, int mask) +{ + struct path *path = &file->f_path; + struct inode *inode = path->dentry->d_inode; + __u32 fsnotify_mask; + + if (file->f_mode & FMODE_NONOTIFY) + return 0; + if (!(mask & (MAY_READ | MAY_OPEN))) + return 0; + if (mask & MAY_READ) + fsnotify_mask = FS_ACCESS_PERM; + if (mask & MAY_OPEN) + fsnotify_mask = FS_OPEN_PERM; + + return fsnotify(inode, fsnotify_mask, path, FSNOTIFY_EVENT_PATH, NULL, 0); +} + /* * fsnotify_d_move - dentry has been moved * Called with dcache_lock and dentry->d_lock held. |