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-rw-r--r--fs/notify/fanotify/fanotify.c32
-rw-r--r--fs/notify/fanotify/fanotify_user.c12
-rw-r--r--fs/notify/fdinfo.c1
-rw-r--r--fs/notify/fsnotify.c2
-rw-r--r--include/linux/fanotify.h5
-rw-r--r--include/linux/fsnotify.h61
-rw-r--r--include/linux/fsnotify_backend.h11
-rw-r--r--include/uapi/linux/fanotify.h2
8 files changed, 79 insertions, 47 deletions
diff --git a/fs/notify/fanotify/fanotify.c b/fs/notify/fanotify/fanotify.c
index e08a6647267b..3723f3d18d20 100644
--- a/fs/notify/fanotify/fanotify.c
+++ b/fs/notify/fanotify/fanotify.c
@@ -89,7 +89,13 @@ static int fanotify_get_response(struct fsnotify_group *group,
return ret;
}
-static bool fanotify_should_send_event(struct fsnotify_iter_info *iter_info,
+/*
+ * This function returns a mask for an event that only contains the flags
+ * that have been specifically requested by the user. Flags that may have
+ * been included within the event mask, but have not been explicitly
+ * requested by the user, will not be present in the returned mask.
+ */
+static u32 fanotify_group_event_mask(struct fsnotify_iter_info *iter_info,
u32 event_mask, const void *data,
int data_type)
{
@@ -101,14 +107,14 @@ static bool fanotify_should_send_event(struct fsnotify_iter_info *iter_info,
pr_debug("%s: report_mask=%x mask=%x data=%p data_type=%d\n",
__func__, iter_info->report_mask, event_mask, data, data_type);
- /* if we don't have enough info to send an event to userspace say no */
+ /* If we don't have enough info to send an event to userspace say no */
if (data_type != FSNOTIFY_EVENT_PATH)
- return false;
+ return 0;
- /* sorry, fanotify only gives a damn about files and dirs */
+ /* Sorry, fanotify only gives a damn about files and dirs */
if (!d_is_reg(path->dentry) &&
!d_can_lookup(path->dentry))
- return false;
+ return 0;
fsnotify_foreach_obj_type(type) {
if (!fsnotify_iter_should_report_type(iter_info, type))
@@ -129,13 +135,10 @@ static bool fanotify_should_send_event(struct fsnotify_iter_info *iter_info,
if (d_is_dir(path->dentry) &&
!(marks_mask & FS_ISDIR & ~marks_ignored_mask))
- return false;
-
- if (event_mask & FANOTIFY_OUTGOING_EVENTS &
- marks_mask & ~marks_ignored_mask)
- return true;
+ return 0;
- return false;
+ return event_mask & FANOTIFY_OUTGOING_EVENTS & marks_mask &
+ ~marks_ignored_mask;
}
struct fanotify_event_info *fanotify_alloc_event(struct fsnotify_group *group,
@@ -207,10 +210,13 @@ static int fanotify_handle_event(struct fsnotify_group *group,
BUILD_BUG_ON(FAN_OPEN_PERM != FS_OPEN_PERM);
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) != 10);
+ BUILD_BUG_ON(HWEIGHT32(ALL_FANOTIFY_EVENT_BITS) != 12);
- if (!fanotify_should_send_event(iter_info, mask, data, data_type))
+ mask = fanotify_group_event_mask(iter_info, mask, data, data_type);
+ if (!mask)
return 0;
pr_debug("%s: group=%p inode=%p mask=%x\n", __func__, group, inode,
diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
index e03be5071362..9c870b0d2b56 100644
--- a/fs/notify/fanotify/fanotify_user.c
+++ b/fs/notify/fanotify/fanotify_user.c
@@ -206,7 +206,7 @@ static int process_access_response(struct fsnotify_group *group,
static ssize_t copy_event_to_user(struct fsnotify_group *group,
struct fsnotify_event *event,
- char __user *buf)
+ char __user *buf, size_t count)
{
struct fanotify_event_metadata fanotify_event_metadata;
struct file *f;
@@ -220,6 +220,12 @@ static ssize_t copy_event_to_user(struct fsnotify_group *group,
fd = fanotify_event_metadata.fd;
ret = -EFAULT;
+ /*
+ * Sanity check copy size in case get_one_event() and
+ * fill_event_metadata() event_len sizes ever get out of sync.
+ */
+ if (WARN_ON_ONCE(fanotify_event_metadata.event_len > count))
+ goto out_close_fd;
if (copy_to_user(buf, &fanotify_event_metadata,
fanotify_event_metadata.event_len))
goto out_close_fd;
@@ -295,7 +301,7 @@ static ssize_t fanotify_read(struct file *file, char __user *buf,
continue;
}
- ret = copy_event_to_user(group, kevent, buf);
+ ret = copy_event_to_user(group, kevent, buf, count);
if (unlikely(ret == -EOPENSTALE)) {
/*
* We cannot report events with stale fd so drop it.
@@ -669,7 +675,7 @@ static int fanotify_add_inode_mark(struct fsnotify_group *group,
*/
if ((flags & FAN_MARK_IGNORED_MASK) &&
!(flags & FAN_MARK_IGNORED_SURV_MODIFY) &&
- (atomic_read(&inode->i_writecount) > 0))
+ inode_is_open_for_write(inode))
return 0;
return fanotify_add_mark(group, &inode->i_fsnotify_marks,
diff --git a/fs/notify/fdinfo.c b/fs/notify/fdinfo.c
index 348a184bcdda..1e2bfd26b352 100644
--- a/fs/notify/fdinfo.c
+++ b/fs/notify/fdinfo.c
@@ -15,6 +15,7 @@
#include <linux/exportfs.h>
#include "inotify/inotify.h"
+#include "fdinfo.h"
#include "fsnotify.h"
#if defined(CONFIG_PROC_FS)
diff --git a/fs/notify/fsnotify.c b/fs/notify/fsnotify.c
index d2c34900ae05..ecf09b6243d9 100644
--- a/fs/notify/fsnotify.c
+++ b/fs/notify/fsnotify.c
@@ -401,7 +401,7 @@ static __init int fsnotify_init(void)
{
int ret;
- BUILD_BUG_ON(HWEIGHT32(ALL_FSNOTIFY_BITS) != 23);
+ BUILD_BUG_ON(HWEIGHT32(ALL_FSNOTIFY_BITS) != 25);
ret = init_srcu_struct(&fsnotify_mark_srcu);
if (ret)
diff --git a/include/linux/fanotify.h b/include/linux/fanotify.h
index a5a60691e48b..9e2142795335 100644
--- a/include/linux/fanotify.h
+++ b/include/linux/fanotify.h
@@ -37,10 +37,11 @@
/* Events that user can request to be notified on */
#define FANOTIFY_EVENTS (FAN_ACCESS | FAN_MODIFY | \
- FAN_CLOSE | FAN_OPEN)
+ 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)
diff --git a/include/linux/fsnotify.h b/include/linux/fsnotify.h
index fd1ce10553bf..2ccb08cb5d6a 100644
--- a/include/linux/fsnotify.h
+++ b/include/linux/fsnotify.h
@@ -26,30 +26,46 @@ 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 wrapper to consolidate calls fsnotify_parent()/fsnotify() when
+ * an event is on a path.
+ */
+static inline int fsnotify_path(struct inode *inode, const struct path *path,
+ __u32 mask)
+{
+ int ret = fsnotify_parent(path, NULL, mask);
+
+ if (ret)
+ return ret;
+ return fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
+}
+
+/* Simple call site for access decisions */
static inline int fsnotify_perm(struct file *file, int mask)
{
+ int ret;
const struct path *path = &file->f_path;
struct inode *inode = file_inode(file);
__u32 fsnotify_mask = 0;
- int ret;
if (file->f_mode & FMODE_NONOTIFY)
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)
- fsnotify_mask = FS_ACCESS_PERM;
- else
- BUG();
- ret = fsnotify_parent(path, NULL, fsnotify_mask);
- if (ret)
- return ret;
+ if (file->f_flags & __FMODE_EXEC) {
+ ret = fsnotify_path(inode, path, FS_OPEN_EXEC_PERM);
- return fsnotify(inode, fsnotify_mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
+ if (ret)
+ return ret;
+ }
+ } else if (mask & MAY_READ) {
+ fsnotify_mask = FS_ACCESS_PERM;
+ }
+
+ return fsnotify_path(inode, path, fsnotify_mask);
}
/*
@@ -180,10 +196,8 @@ static inline void fsnotify_access(struct file *file)
if (S_ISDIR(inode->i_mode))
mask |= FS_ISDIR;
- if (!(file->f_mode & FMODE_NONOTIFY)) {
- fsnotify_parent(path, NULL, mask);
- fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
- }
+ if (!(file->f_mode & FMODE_NONOTIFY))
+ fsnotify_path(inode, path, mask);
}
/*
@@ -198,10 +212,8 @@ static inline void fsnotify_modify(struct file *file)
if (S_ISDIR(inode->i_mode))
mask |= FS_ISDIR;
- if (!(file->f_mode & FMODE_NONOTIFY)) {
- fsnotify_parent(path, NULL, mask);
- fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
- }
+ if (!(file->f_mode & FMODE_NONOTIFY))
+ fsnotify_path(inode, path, mask);
}
/*
@@ -215,9 +227,10 @@ static inline void fsnotify_open(struct file *file)
if (S_ISDIR(inode->i_mode))
mask |= FS_ISDIR;
+ if (file->f_flags & __FMODE_EXEC)
+ mask |= FS_OPEN_EXEC;
- fsnotify_parent(path, NULL, mask);
- fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
+ fsnotify_path(inode, path, mask);
}
/*
@@ -233,10 +246,8 @@ static inline void fsnotify_close(struct file *file)
if (S_ISDIR(inode->i_mode))
mask |= FS_ISDIR;
- if (!(file->f_mode & FMODE_NONOTIFY)) {
- fsnotify_parent(path, NULL, mask);
- fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);
- }
+ if (!(file->f_mode & FMODE_NONOTIFY))
+ fsnotify_path(inode, path, mask);
}
/*
diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h
index 135b973e44d1..7639774e7475 100644
--- a/include/linux/fsnotify_backend.h
+++ b/include/linux/fsnotify_backend.h
@@ -38,6 +38,7 @@
#define FS_DELETE 0x00000200 /* Subfile was deleted */
#define FS_DELETE_SELF 0x00000400 /* Self was deleted */
#define FS_MOVE_SELF 0x00000800 /* Self was moved */
+#define FS_OPEN_EXEC 0x00001000 /* File was opened for exec */
#define FS_UNMOUNT 0x00002000 /* inode on umount fs */
#define FS_Q_OVERFLOW 0x00004000 /* Event queued overflowed */
@@ -45,6 +46,7 @@
#define FS_OPEN_PERM 0x00010000 /* open event in an 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 */
@@ -62,11 +64,13 @@
#define FS_EVENTS_POSS_ON_CHILD (FS_ACCESS | FS_MODIFY | FS_ATTRIB |\
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_DELETE | FS_OPEN_PERM | FS_ACCESS_PERM | \
+ 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 | \
@@ -74,7 +78,8 @@
FS_MOVED_FROM | FS_MOVED_TO | FS_CREATE | \
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_PERM | FS_ACCESS_PERM | FS_DN_RENAME | \
+ 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 | \
diff --git a/include/uapi/linux/fanotify.h b/include/uapi/linux/fanotify.h
index b86740d1c50a..909c98fcace2 100644
--- a/include/uapi/linux/fanotify.h
+++ b/include/uapi/linux/fanotify.h
@@ -10,11 +10,13 @@
#define FAN_CLOSE_WRITE 0x00000008 /* Writtable file closed */
#define FAN_CLOSE_NOWRITE 0x00000010 /* Unwrittable file closed */
#define FAN_OPEN 0x00000020 /* File was opened */
+#define FAN_OPEN_EXEC 0x00001000 /* File was opened for exec */
#define FAN_Q_OVERFLOW 0x00004000 /* Event queued overflowed */
#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 */