From 25a74f3ba8efb394e9a30d6de37566bf03fd3de8 Mon Sep 17 00:00:00 2001
From: Stephen Smalley <sds@tycho.nsa.gov>
Date: Tue, 8 Nov 2005 21:34:33 -0800
Subject: [PATCH] [PATCH] selinux: disable setxattr on mountpoint labeled
filesystems
This patch disables the setting of SELinux xattrs on files created in
filesystems labeled via mountpoint labeling (mounted with the context=
option). selinux_inode_setxattr already prevents explicit setxattr from
userspace on such filesystems, so this provides consistent behavior for
file creation.
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: James Morris <jmorris@namei.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
security/selinux/hooks.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 45c41490d521e2..fc774436a264d0 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -1986,6 +1986,9 @@ static int selinux_inode_init_security(struct inode *inode, struct inode *dir,
inode_security_set_sid(inode, newsid);
+ if (sbsec->behavior == SECURITY_FS_USE_MNTPOINT)
+ return -EOPNOTSUPP;
+
if (name) {
namep = kstrdup(XATTR_SELINUX_SUFFIX, GFP_KERNEL);
if (!namep)
--
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