Stephen Smalley <sds@xxxxxxxxxxxxx> wrote:
> > Fair point. What does SBLABEL_MNT mean precisely? It seems to indicate one
> > of an odd mix of behaviours. I presume it means that we *have* to calculate a
> > label and can't get one from the underlying fs if it is not set.
>
> It means the filesystem supports per-file labeling and you can use
> setxattr(..."security.selinux") and setfscreatecon() for files on it.
> You can see whether it is set on a filesystem by looking for the
> seclabel option in cat /proc/mounts. If it is not set, then we ignore
> tsec->create_sid. It is arguable as to whether it is correct to always
> call security_transition_sid() there either, but that's another topic.
Okay, so how about the attached?
David
---
static int selinux_determine_inode_label(const struct inode *dir,
const struct qstr *name,
const char *caller,
u16 tclass,
u32 *_new_isid)
{
const struct superblock_security_struct *sbsec = dir->i_sb->s_security;
const struct inode_security_struct *dsec = dir->i_security;
const struct task_security_struct *tsec = current_security();
if ((sbsec->flags & SE_SBINITIALIZED) &&
(sbsec->behavior == SECURITY_FS_USE_MNTPOINT)) {
*_new_isid = sbsec->mntpoint_sid;
} else if ((sbsec->flags & SBLABEL_MNT) &&
tsec->create_sid) {
*_new_isid = tsec->create_sid;
} else {
return security_transition_sid(tsec->sid, dsec->sid, tclass,
name, _new_isid);
}
return 0;
}
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