@@ -327,6 +327,8 @@ static void cachefiles_commit_object(struct cachefiles_object *object,
static void cachefiles_clean_up_object(struct cachefiles_object *object,
struct cachefiles_cache *cache)
{
+ struct file *file;
+
if (test_bit(FSCACHE_COOKIE_RETIRED, &object->cookie->flags)) {
if (!test_bit(CACHEFILES_OBJECT_USING_TMPFILE, &object->flags)) {
cachefiles_see_object(object, cachefiles_obj_see_clean_delete);
@@ -342,10 +344,14 @@ static void cachefiles_clean_up_object(struct cachefiles_object *object,
}
cachefiles_unmark_inode_in_use(object, object->file);
- if (object->file) {
- fput(object->file);
- object->file = NULL;
- }
+
+ spin_lock(&object->lock);
+ file = object->file;
+ object->file = NULL;
+ spin_unlock(&object->lock);
+
+ if (file)
+ fput(file);
}
/*
@@ -60,20 +60,26 @@ static ssize_t cachefiles_ondemand_fd_write_iter(struct kiocb *kiocb,
{
struct cachefiles_object *object = kiocb->ki_filp->private_data;
struct cachefiles_cache *cache = object->volume->cache;
- struct file *file = object->file;
+ struct file *file;
size_t len = iter->count, aligned_len = len;
loff_t pos = kiocb->ki_pos;
const struct cred *saved_cred;
int ret;
- if (!file)
+ spin_lock(&object->lock);
+ file = object->file;
+ if (!file) {
+ spin_unlock(&object->lock);
return -ENOBUFS;
+ }
+ get_file(file);
+ spin_unlock(&object->lock);
cachefiles_begin_secure(cache, &saved_cred);
ret = __cachefiles_prepare_write(object, file, &pos, &aligned_len, len, true);
cachefiles_end_secure(cache, saved_cred);
if (ret < 0)
- return ret;
+ goto out;
trace_cachefiles_ondemand_fd_write(object, file_inode(file), pos, len);
ret = __cachefiles_write(object, file, pos, iter, NULL, NULL);
@@ -82,6 +88,8 @@ static ssize_t cachefiles_ondemand_fd_write_iter(struct kiocb *kiocb,
kiocb->ki_pos += ret;
}
+out:
+ fput(file);
return ret;
}
@@ -89,12 +97,22 @@ static loff_t cachefiles_ondemand_fd_llseek(struct file *filp, loff_t pos,
int whence)
{
struct cachefiles_object *object = filp->private_data;
- struct file *file = object->file;
+ struct file *file;
+ loff_t ret;
- if (!file)
+ spin_lock(&object->lock);
+ file = object->file;
+ if (!file) {
+ spin_unlock(&object->lock);
return -ENOBUFS;
+ }
+ get_file(file);
+ spin_unlock(&object->lock);
- return vfs_llseek(file, pos, whence);
+ ret = vfs_llseek(file, pos, whence);
+ fput(file);
+
+ return ret;
}
static long cachefiles_ondemand_fd_ioctl(struct file *filp, unsigned int ioctl,
At present, the object->file has the NULL pointer dereference problem in ondemand-mode. The root cause is that the allocated fd and object->file lifetime are inconsistent, and the user-space invocation to anon_fd uses object->file. Following is the process that triggers the issue: [write fd] [umount] cachefiles_ondemand_fd_write_iter fscache_cookie_state_machine cachefiles_withdraw_cookie if (!file) return -ENOBUFS cachefiles_clean_up_object cachefiles_unmark_inode_in_use fput(object->file) object->file = NULL // file NULL pointer dereference! __cachefiles_write(..., file, ...) Fix this issue by add an additional reference count to the object->file before write/llseek, and decrement after it finished. Fixes: c8383054506c ("cachefiles: notify the user daemon when looking up cookie") Signed-off-by: Zizhi Wo <wozizhi@huawei.com> --- fs/cachefiles/interface.c | 14 ++++++++++---- fs/cachefiles/ondemand.c | 30 ++++++++++++++++++++++++------ 2 files changed, 34 insertions(+), 10 deletions(-)