From 0162392a28b75ccb6c3b26c26f2a83b5973a2d92 Mon Sep 17 00:00:00 2001
From: Sebastian Lackner
Date: Wed, 29 Nov 2017 12:54:34 +0100
Subject: fusefrontend: Use Fchmodat to implement Chmod

---
 internal/fusefrontend/fs.go | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

(limited to 'internal/fusefrontend')

diff --git a/internal/fusefrontend/fs.go b/internal/fusefrontend/fs.go
index 002b4e1..c4035fa 100644
--- a/internal/fusefrontend/fs.go
+++ b/internal/fusefrontend/fs.go
@@ -239,13 +239,14 @@ func (fs *FS) Chmod(path string, mode uint32, context *fuse.Context) (code fuse.
 	if fs.isFiltered(path) {
 		return fuse.EPERM
 	}
-	cPath, err := fs.getBackingPath(path)
+	dirfd, cName, err := fs.openBackingPath(path)
 	if err != nil {
 		return fuse.ToStatus(err)
 	}
+	defer dirfd.Close()
 	// os.Chmod goes through the "syscallMode" translation function that messes
-	// up the suid and sgid bits. So use syscall.Chmod directly.
-	err = syscall.Chmod(cPath, mode)
+	// up the suid and sgid bits. So use a syscall directly.
+	err = syscallcompat.Fchmodat(int(dirfd.Fd()), cName, mode, unix.AT_SYMLINK_NOFOLLOW)
 	return fuse.ToStatus(err)
 }
 
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