On 12/16/2014 7:53 AM, Łukasz Stelmach wrote:
> 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 <[email protected]>
Applied to git://git.gitorious.org/smack-next/kernel.git#smack-for-3.20
> ---
> security/smack/smack_lsm.c | 16 ++++++++++++++--
> 1 file changed, 14 insertions(+), 2 deletions(-)
>
> diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
> index e8bed86..b774029 100644
> --- a/security/smack/smack_lsm.c
> +++ b/security/smack/smack_lsm.c
> @@ -3036,18 +3036,30 @@ static void smack_d_instantiate(struct dentry
> *opt_dentry, struct inode *inode)
> * If that is the case use the root value out
> * of the superblock.
> */
> 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,
> * so there's no opportunity to set the mount
> * options.
> */
> sbsp->smk_root = &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;
> goto unlockandout;
> }
>
--
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