From: Sam Huffman <40582525+samh-sifive@users.noreply.github.com>
Date: Fri, 8 Mar 2019 21:26:31 +0000 (-0800)
Subject: fusermount: drop privileges for chdir()
X-Git-Tag: fuse-3.4.2~6
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=774eb66fc1eb006b601f3890958f02e7b90575ad;p=qemu-gpiodev%2Flibfuse.git

fusermount: drop privileges for chdir()

cd to mountpoint's parent directory using unprivileged rather than
privileged access. This is to ensure that unmount works on mountpoints
where root may not have privileged access.

Fixes: #376
---

diff --git a/util/fusermount.c b/util/fusermount.c
index e6ac792..3f13e42 100644
--- a/util/fusermount.c
+++ b/util/fusermount.c
@@ -428,7 +428,9 @@ static int unmount_fuse_locked(const char *mnt, int quiet, int lazy)
 		return -1;
 	}
 
+	drop_privs();
 	res = chdir_to_parent(copy, &last);
+	restore_privs();
 	if (res == -1)
 		goto out;