Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse

Pull fuse updates from Miklos Szeredi:
 "This fixes a regression (spotted by the Sandstorm.io folks) in the pid
  namespace handling introduced in 4.12.

  There's also a fix for honoring sync/dsync flags for pwritev2()"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse:
  fuse: getattr cleanup
  fuse: honor iocb sync flags on write
  fuse: allow server to run in different pid_ns

1 files changed, 7 insertions, 6 deletions

diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index c16d00e53264..13c65dd2d37d 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -1222,9 +1222,6 @@ static ssize_t fuse_dev_do_read(struct fuse_dev *fud, struct file *file,
 	struct fuse_in *in;
 	unsigned reqsize;
 
-	if (task_active_pid_ns(current) != fc->pid_ns)
-		return -EIO;
-
  restart:
 	spin_lock(&fiq->waitq.lock);
 	err = -EAGAIN;
@@ -1262,6 +1259,13 @@ static ssize_t fuse_dev_do_read(struct fuse_dev *fud, struct file *file,
 
 	in = &req->in;
 	reqsize = in->h.len;
+
+	if (task_active_pid_ns(current) != fc->pid_ns) {
+		rcu_read_lock();
+		in->h.pid = pid_vnr(find_pid_ns(in->h.pid, fc->pid_ns));
+		rcu_read_unlock();
+	}
+
 	/* If request is too large, reply with an error and restart the read */
 	if (nbytes < reqsize) {
 		req->out.h.error = -EIO;
@@ -1823,9 +1827,6 @@ static ssize_t fuse_dev_do_write(struct fuse_dev *fud,
 	struct fuse_req *req;
 	struct fuse_out_header oh;
 
-	if (task_active_pid_ns(current) != fc->pid_ns)
-		return -EIO;
-
 	if (nbytes < sizeof(struct fuse_out_header))
 		return -EINVAL;