From 11d11ff47a952f09a85be5ed85c83ee19f8a74d2 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=C5=81ukasz=20Stelmach?= Date: Tue, 16 Dec 2014 16:53:08 +0100 Subject: [PATCH 47/54] smack: introduce a special case for tmpfs in smack_d_instantiate() MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 --- 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 2ec6cdb..bc43227 100644 --- a/security/smack/smack_lsm.c +++ b/security/smack/smack_lsm.c @@ -3037,7 +3037,8 @@ 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) { + switch (sbp->s_magic) { + case CGROUP_SUPER_MAGIC: /* * The cgroup filesystem is never mounted, * so there's no opportunity to set the mount @@ -3045,8 +3046,19 @@ static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode) */ 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; } -- 2.1.4