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smack: introduce a special case for tmpfs in smack_d_instantiate()

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Files created with __shmem_file_stup() appear to have somewhat fake
dentries which make them look like root directories and not get
the label the current process or ("*") star meant for tmpfs files.

Signed-off-by: Łukasz Stelmach <l.stelmach@samsung.com>
This commit is contained in:
Łukasz Stelmach 2014-12-16 16:53:08 +01:00 committed by Casey Schaufler
parent 68390ccf8b
commit 1d8c2326a4
1 changed files with 14 additions and 2 deletions
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16
security/smack/smack_lsm.c
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@ -3036,7 +3036,8 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
* of the superblock. * of the superblock.
*/ */
if (opt_dentry->d_parent == opt_dentry) { if (opt_dentry->d_parent == opt_dentry) {
if (sbp->s_magic == CGROUP_SUPER_MAGIC) { switch (sbp->s_magic) {
case CGROUP_SUPER_MAGIC:
/* /*
* The cgroup filesystem is never mounted, * The cgroup filesystem is never mounted,
* so there's no opportunity to set the mount * so there's no opportunity to set the mount
@ -3044,8 +3045,19 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
*/ */
sbsp->smk_root = &smack_known_star; sbsp->smk_root = &smack_known_star;
sbsp->smk_default = &smack_known_star; sbsp->smk_default = &smack_known_star;
isp->smk_inode = sbsp->smk_root;
break;
case TMPFS_MAGIC:
/*
* What about shmem/tmpfs anonymous files with dentry
* obtained from d_alloc_pseudo()?
*/
isp->smk_inode = smk_of_current();
break;
default:
isp->smk_inode = sbsp->smk_root;
break;
} }
isp->smk_inode = sbsp->smk_root;
isp->smk_flags |= SMK_INODE_INSTANT; isp->smk_flags |= SMK_INODE_INSTANT;
goto unlockandout; goto unlockandout;
} }