[patch 1/1] selinux: Disable setxattr on mountpoint labeled filesystems

[Stephen Smalley]

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. Please apply, for 2.6.15 if possible.

Signed-off-by: Stephen Smalley <s...@tycho.nsa.gov>
Signed-off-by: James Morris <jmo...@namei.org>

---

security/selinux/hooks.c | 3 +++
1 files changed, 3 insertions(+)

Index: linux-2.6/security/selinux/hooks.c
===================================================================
RCS file: /nfshome/pal/CVS/linux-2.6/security/selinux/hooks.c,v
retrieving revision 1.173
diff -u -p -r1.173 hooks.c
--- linux-2.6/security/selinux/hooks.c 31 Oct 2005 15:36:30 -0000 1.173
+++ linux-2.6/security/selinux/hooks.c 4 Nov 2005 20:55:20 -0000
@@ -1986,6 +1986,9 @@ static int selinux_inode_init_security(s

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)

--
Stephen Smalley
National Security Agency

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