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Smack: Label cgroup files for systemd

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The cgroup filesystem isn't ready for an LSM to
properly use extented attributes. This patch makes
files created in the cgroup filesystem usable by
a system running Smack and systemd.

Targeted for git://git.gitorious.org/smack-next/kernel.git

Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
This commit is contained in:
Casey Schaufler 2014-04-28 15:23:01 -07:00
parent a6834c0b91
commit 36ea735b52
1 changed files with 18 additions and 12 deletions
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30
security/smack/smack_lsm.c
View file

@ -2821,6 +2821,15 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
* of the superblock.
*/
if (opt_dentry->d_parent == opt_dentry) {
if (sbp->s_magic == CGROUP_SUPER_MAGIC) {
/*
* The cgroup filesystem is never mounted,
* so there's no opportunity to set the mount
* options.
*/
sbsp->smk_root = smack_known_star.smk_known;
sbsp->smk_default = smack_known_star.smk_known;
}
isp->smk_inode = sbsp->smk_root;
isp->smk_flags |= SMK_INODE_INSTANT;
goto unlockandout;
@ -2834,16 +2843,20 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
*/
switch (sbp->s_magic) {
case SMACK_MAGIC:
case PIPEFS_MAGIC:
case SOCKFS_MAGIC:
case CGROUP_SUPER_MAGIC:
/*
* Casey says that it's a little embarrassing
* that the smack file system doesn't do
* extended attributes.
*/
final = smack_known_star.smk_known;
break;
case PIPEFS_MAGIC:
/*
*
* Casey says pipes are easy (?)
*
* Socket access is controlled by the socket
* structures associated with the task involved.
*
* Cgroupfs is special
*/
final = smack_known_star.smk_known;
break;
@ -2855,13 +2868,6 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
*/
final = ckp->smk_known;
break;
case SOCKFS_MAGIC:
/*
* Socket access is controlled by the socket
* structures associated with the task involved.
*/
final = smack_known_star.smk_known;
break;
case PROC_SUPER_MAGIC:
/*
* Casey says procfs appears not to care.