[PATCH] selinux: Fix SBLABEL_MNT for NFS mounts

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Labelling of files in a NFSv4.2 currently fails with ENOTSUPP because
the mount point doesn't have SBLABEL_MNT.

Add specific condition for NFS4 filesystems so it gets correctly
labeled.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@xxxxxxxxxxxxx>
Cc: J. Bruce Fields <bfields@xxxxxxxxxx>

---

Hi,

cannot remotely say that I currently understand how selinux is expected
to work within NFS mounts, but this change allowed me to fully boot AOSP
with its rootfs and ramdisk on a single NFS share.

Thanks,

Tomeu
---
 security/selinux/hooks.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 0c2ac318aa7f..71cd1d8c67c2 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -485,6 +485,7 @@ static int selinux_is_sblabel_mnt(struct super_block *sb)
 		!strcmp(sb->s_type->name, "debugfs") ||
 		!strcmp(sb->s_type->name, "tracefs") ||
 		!strcmp(sb->s_type->name, "rootfs") ||
+		!strcmp(sb->s_type->name, "nfs4") ||
 		(selinux_policycap_cgroupseclabel &&
 		 (!strcmp(sb->s_type->name, "cgroup") ||
 		  !strcmp(sb->s_type->name, "cgroup2")));
-- 
2.9.3

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