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-rw-r--r--fs/notify/fanotify/fanotify.c19
-rw-r--r--fs/notify/fanotify/fanotify.h3
-rw-r--r--fs/notify/fanotify/fanotify_user.c2
3 files changed, 17 insertions, 7 deletions
diff --git a/fs/notify/fanotify/fanotify.c b/fs/notify/fanotify/fanotify.c
index 6702a6a0bbb5..928f2a5eedb7 100644
--- a/fs/notify/fanotify/fanotify.c
+++ b/fs/notify/fanotify/fanotify.c
@@ -139,23 +139,32 @@ static bool fanotify_should_send_event(struct fsnotify_mark *inode_mark,
return false;
}
-struct fanotify_event_info *fanotify_alloc_event(struct inode *inode, u32 mask,
+struct fanotify_event_info *fanotify_alloc_event(struct fsnotify_group *group,
+ struct inode *inode, u32 mask,
const struct path *path)
{
struct fanotify_event_info *event;
+ gfp_t gfp = GFP_KERNEL;
+
+ /*
+ * For queues with unlimited length lost events are not expected and
+ * can possibly have security implications. Avoid losing events when
+ * memory is short.
+ */
+ if (group->max_events == UINT_MAX)
+ gfp |= __GFP_NOFAIL;
if (fanotify_is_perm_event(mask)) {
struct fanotify_perm_event_info *pevent;
- pevent = kmem_cache_alloc(fanotify_perm_event_cachep,
- GFP_KERNEL);
+ pevent = kmem_cache_alloc(fanotify_perm_event_cachep, gfp);
if (!pevent)
return NULL;
event = &pevent->fae;
pevent->response = 0;
goto init;
}
- event = kmem_cache_alloc(fanotify_event_cachep, GFP_KERNEL);
+ event = kmem_cache_alloc(fanotify_event_cachep, gfp);
if (!event)
return NULL;
init: __maybe_unused
@@ -210,7 +219,7 @@ static int fanotify_handle_event(struct fsnotify_group *group,
return 0;
}
- event = fanotify_alloc_event(inode, mask, data);
+ event = fanotify_alloc_event(group, inode, mask, data);
ret = -ENOMEM;
if (unlikely(!event))
goto finish;
diff --git a/fs/notify/fanotify/fanotify.h b/fs/notify/fanotify/fanotify.h
index 256d9d1ddea9..8609ba06f474 100644
--- a/fs/notify/fanotify/fanotify.h
+++ b/fs/notify/fanotify/fanotify.h
@@ -52,5 +52,6 @@ static inline struct fanotify_event_info *FANOTIFY_E(struct fsnotify_event *fse)
return container_of(fse, struct fanotify_event_info, fse);
}
-struct fanotify_event_info *fanotify_alloc_event(struct inode *inode, u32 mask,
+struct fanotify_event_info *fanotify_alloc_event(struct fsnotify_group *group,
+ struct inode *inode, u32 mask,
const struct path *path);
diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
index c07eb3d655ea..72e367822efb 100644
--- a/fs/notify/fanotify/fanotify_user.c
+++ b/fs/notify/fanotify/fanotify_user.c
@@ -757,7 +757,7 @@ SYSCALL_DEFINE2(fanotify_init, unsigned int, flags, unsigned int, event_f_flags)
group->fanotify_data.user = user;
atomic_inc(&user->fanotify_listeners);
- oevent = fanotify_alloc_event(NULL, FS_Q_OVERFLOW, NULL);
+ oevent = fanotify_alloc_event(group, NULL, FS_Q_OVERFLOW, NULL);
if (unlikely(!oevent)) {
fd = -ENOMEM;
goto out_destroy_group;