fuse: fix for CVE-2015-3202 Privilege Escalation

fusermount in FUSE before 2.9.3-15 does not properly clear the environment before
invoking (1) mount or (2) umount as root, which allows local users to write
to arbitrary files via a crafted LIBMOUNT_MTAB environment variable that is
used by mount's debugging feature.

References:
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-3202
http://www.openwall.com/lists/oss-security/2015/05/21/9

Signed-off-by: Tudor Florea <tudor.florea@enea.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
Signed-off-by: Armin Kuster <akuster808@gmail.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/meta-filesystems/recipes-support/fuse/fuse_2.9.3.bb b/meta-filesystems/recipes-support/fuse/fuse_2.9.3.bb
index 60fea873b5..2e2f7a1980 100644
--- a/meta-filesystems/recipes-support/fuse/fuse_2.9.3.bb
+++ b/meta-filesystems/recipes-support/fuse/fuse_2.9.3.bb
@@ -13,6 +13,7 @@ LIC_FILES_CHKSUM = "file://COPYING;md5=b234ee4d69f5fce4486a80fdaf4a4263 \
 SRC_URI = "${SOURCEFORGE_MIRROR}/fuse/fuse-${PV}.tar.gz \
            file://gold-unversioned-symbol.patch \
            file://aarch64.patch \
+           file://001-fix_exec_environment_for_mount_and_umount.patch \
 "
 SRC_URI[md5sum] = "33cae22ca50311446400daf8a6255c6a"
 SRC_URI[sha256sum] = "0beb83eaf2c5e50730fc553406ef124d77bc02c64854631bdfc86bfd6437391c"