@@ -210,8 +210,9 @@ static int fanotify_handle_event(struct fsnotify_group *group,
BUILD_BUG_ON(FAN_ACCESS_PERM != FS_ACCESS_PERM);
BUILD_BUG_ON(FAN_ONDIR != FS_ISDIR);
BUILD_BUG_ON(FAN_OPEN_EXEC != FS_OPEN_EXEC);
+ BUILD_BUG_ON(FAN_OPEN_EXEC_PERM != FS_OPEN_EXEC_PERM);
- BUILD_BUG_ON(HWEIGHT32(ALL_FANOTIFY_EVENT_BITS) != 11);
+ BUILD_BUG_ON(HWEIGHT32(ALL_FANOTIFY_EVENT_BITS) != 12);
mask = fanotify_group_event_mask(iter_info, mask, data, data_type);
if (!mask)
@@ -401,7 +401,7 @@ static __init int fsnotify_init(void)
{
int ret;
- BUILD_BUG_ON(HWEIGHT32(ALL_FSNOTIFY_BITS) != 24);
+ BUILD_BUG_ON(HWEIGHT32(ALL_FSNOTIFY_BITS) != 25);
ret = init_srcu_struct(&fsnotify_mark_srcu);
if (ret)
@@ -40,7 +40,8 @@
FAN_CLOSE | FAN_OPEN | FAN_OPEN_EXEC)
/* Events that require a permission response from user */
-#define FANOTIFY_PERM_EVENTS (FAN_OPEN_PERM | FAN_ACCESS_PERM)
+#define FANOTIFY_PERM_EVENTS (FAN_OPEN_PERM | FAN_ACCESS_PERM | \
+ FAN_OPEN_EXEC_PERM)
/* Extra flags that may be reported with event or control handling of events */
#define FANOTIFY_EVENT_FLAGS (FAN_EVENT_ON_CHILD | FAN_ONDIR)
@@ -26,7 +26,7 @@ static inline int fsnotify_parent(const struct path *path, struct dentry *dentry
return __fsnotify_parent(path, dentry, mask);
}
-/* simple call site for access decisions */
+/* Simple call site for access decisions */
static inline int fsnotify_perm(struct file *file, int mask)
{
const struct path *path = &file->f_path;
@@ -38,12 +38,14 @@ static inline int fsnotify_perm(struct file *file, int mask)
return 0;
if (!(mask & (MAY_READ | MAY_OPEN)))
return 0;
- if (mask & MAY_OPEN)
+ if (mask & MAY_OPEN) {
fsnotify_mask = FS_OPEN_PERM;
- else if (mask & MAY_READ)
+
+ if (file->f_flags & __FMODE_EXEC)
+ fsnotify_mask |= FS_OPEN_EXEC_PERM;
+ } else if (mask & MAY_READ) {
fsnotify_mask = FS_ACCESS_PERM;
- else
- BUG();
+ }
ret = fsnotify_parent(path, NULL, fsnotify_mask);
if (ret)
@@ -44,8 +44,9 @@
#define FS_Q_OVERFLOW 0x00004000 /* Event queued overflowed */
#define FS_IN_IGNORED 0x00008000 /* last inotify event here */
-#define FS_OPEN_PERM 0x00010000 /* open event in an permission hook */
+#define FS_OPEN_PERM 0x00010000 /* open event in a permission hook */
#define FS_ACCESS_PERM 0x00020000 /* access event in a permissions hook */
+#define FS_OPEN_EXEC_PERM 0x00040000 /* open/exec event in a permission hook */
#define FS_EXCL_UNLINK 0x04000000 /* do not send events if object is unlinked */
#define FS_ISDIR 0x40000000 /* event occurred against dir */
@@ -64,11 +65,12 @@
FS_CLOSE_WRITE | FS_CLOSE_NOWRITE | FS_OPEN |\
FS_MOVED_FROM | FS_MOVED_TO | FS_CREATE |\
FS_DELETE | FS_OPEN_PERM | FS_ACCESS_PERM | \
- FS_OPEN_EXEC)
+ FS_OPEN_EXEC | FS_OPEN_EXEC_PERM)
#define FS_MOVE (FS_MOVED_FROM | FS_MOVED_TO)
-#define ALL_FSNOTIFY_PERM_EVENTS (FS_OPEN_PERM | FS_ACCESS_PERM)
+#define ALL_FSNOTIFY_PERM_EVENTS (FS_OPEN_PERM | FS_ACCESS_PERM | \
+ FS_OPEN_EXEC_PERM)
/* Events that can be reported to backends */
#define ALL_FSNOTIFY_EVENTS (FS_ACCESS | FS_MODIFY | FS_ATTRIB | \
@@ -77,7 +79,7 @@
FS_DELETE | FS_DELETE_SELF | FS_MOVE_SELF | \
FS_UNMOUNT | FS_Q_OVERFLOW | FS_IN_IGNORED | \
FS_OPEN_PERM | FS_ACCESS_PERM | FS_DN_RENAME | \
- FS_OPEN_EXEC)
+ FS_OPEN_EXEC | FS_OPEN_EXEC_PERM)
/* Extra flags that may be reported with event or control handling of events */
#define ALL_FSNOTIFY_FLAGS (FS_EXCL_UNLINK | FS_ISDIR | FS_IN_ONESHOT | \
@@ -16,6 +16,7 @@
#define FAN_OPEN_PERM 0x00010000 /* File open in perm check */
#define FAN_ACCESS_PERM 0x00020000 /* File accessed in perm check */
+#define FAN_OPEN_EXEC_PERM 0x00040000 /* File open/exec in perm check */
#define FAN_ONDIR 0x40000000 /* event occurred against dir */
A new event mask FAN_OPEN_EXEC_PERM has been defined. This allows users to receive events and grant acccess to files that are intending to be opened for execution. Events of FAN_OPEN_EXEC_PERM type will be generated when a file has been opened by using either execve(), execveat() or uselib() system calls. This acts in the same manner as previous permission event types, meaning that an access response is required from the application to permit any further operations on the file. This feature is implemented within the fsnotify_perm() hook by setting the FAN_OPEN_EXEC_PERM event type if __FMODE_EXEC is set within file->f_flags. Signed-off-by: Matthew Bobrowski <mbobrowski@mbobrowski.org> --- fs/notify/fanotify/fanotify.c | 3 ++- fs/notify/fsnotify.c | 2 +- include/linux/fanotify.h | 3 ++- include/linux/fsnotify.h | 12 +++++++----- include/linux/fsnotify_backend.h | 10 ++++++---- include/uapi/linux/fanotify.h | 1 + 6 files changed, 19 insertions(+), 12 deletions(-)