[PATCH v2] libselinux: mount selinuxfs noexec and nosuid

[Topi Miettinen <toiwoton@gmail.com>]

Mount selinuxfs with mount flags noexec and nosuid. It's not likely
that this has any effect, but it's visually more pleasing.

Option nodev can't be used because of /sys/fs/selinux/null device,
which is used by Android.

Signed-off-by: Topi Miettinen <toiwoton@gmail.com>
---
 libselinux/src/load_policy.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libselinux/src/load_policy.c b/libselinux/src/load_policy.c
index fa1a3bf1..2aea826f 100644
--- a/libselinux/src/load_policy.c
+++ b/libselinux/src/load_policy.c
@@ -279,7 +279,8 @@ int selinux_init_load_policy(int *enforce)
 	const char *mntpoint = NULL;
 	/* First make sure /sys is mounted */
 	if (mount("sysfs", "/sys", "sysfs", 0, 0) == 0 || errno == EBUSY) {
-		if (mount(SELINUXFS, SELINUXMNT, SELINUXFS, 0, 0) == 0 || errno == EBUSY) {
+		/* MS_NODEV can't be set because of /sys/fs/selinux/null device, used by Android */
+		if (mount(SELINUXFS, SELINUXMNT, SELINUXFS, MS_NOEXEC | MS_NOSUID, 0) == 0 || errno == EBUSY) {
 			mntpoint = SELINUXMNT;
 		} else {
 			/* check old mountpoint */
-- 
2.26.2