The previous commit deferred inode initialization until the current
SELinux state/namespace has been initialized, which fixes some
cases but can still leave some inodes unlabeled. Instead of
deferring initialization, proceed with initialization using the
nearest ancestor namespace that is initialized.
Signed-off-by: Stephen Smalley <stephen.smalley.work@xxxxxxxxx>
---
security/selinux/hooks.c | 47 +++++++++++++++++------------
security/selinux/include/security.h | 6 ++--
2 files changed, 31 insertions(+), 22 deletions(-)
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index dfc422d9c042..5ce0e2afd84f 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -1320,10 +1320,9 @@ static inline u16 socket_type_to_security_class(int family, int type, int protoc
return SECCLASS_SOCKET;
}
-static int selinux_genfs_get_sid(struct dentry *dentry,
- u16 tclass,
- u16 flags,
- u32 *sid)
+static int selinux_genfs_get_sid(struct selinux_state *state,
+ struct dentry *dentry, u16 tclass,
+ u16 flags, u32 *sid)
{
int rc;
struct super_block *sb = dentry->d_sb;
@@ -1346,8 +1345,8 @@ static int selinux_genfs_get_sid(struct dentry *dentry,
path++;
}
}
- rc = security_genfs_sid(current_selinux_state, sb->s_type->name,
- path, tclass, sid);
+ rc = security_genfs_sid(state, sb->s_type->name, path,
+ tclass, sid);
if (rc == -ENOENT) {
/* No match in policy, mark as unlabeled. */
*sid = SECINITSID_UNLABELED;
@@ -1358,7 +1357,9 @@ static int selinux_genfs_get_sid(struct dentry *dentry,
return rc;
}
-static int inode_doinit_use_xattr(struct inode *inode, struct dentry *dentry,
+static int inode_doinit_use_xattr(struct selinux_state *state,
+ struct inode *inode,
+ struct dentry *dentry,
u32 def_sid, u32 *sid)
{
#define INITCONTEXTLEN 255
@@ -1401,8 +1402,8 @@ static int inode_doinit_use_xattr(struct inode *inode, struct dentry *dentry,
return 0;
}
- rc = security_context_to_sid_default(current_selinux_state, context, rc,
- sid, def_sid, GFP_NOFS);
+ rc = security_context_to_sid_default(state, context, rc, sid,
+ def_sid, GFP_NOFS);
if (rc) {
char *dev = inode->i_sb->s_id;
unsigned long ino = inode->i_ino;
@@ -1422,6 +1423,7 @@ static int inode_doinit_use_xattr(struct inode *inode, struct dentry *dentry,
/* The inode's security attributes must be initialized before first use. */
static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry)
{
+ struct selinux_state *state = current_selinux_state;
struct superblock_security_struct *sbsec = NULL;
struct inode_security_struct *isec = selinux_inode(inode);
u32 task_sid, sid = 0;
@@ -1440,8 +1442,7 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent
isec->sclass = inode_mode_to_security_class(inode->i_mode);
sbsec = selinux_superblock(inode->i_sb);
- if (!(sbsec->flags & SE_SBINITIALIZED) ||
- !selinux_initialized(current_selinux_state)) {
+ if (!(sbsec->flags & SE_SBINITIALIZED)) {
/* Defer initialization until selinux_complete_init,
after the initial policy is loaded and the security
server is ready to handle calls. */
@@ -1452,6 +1453,13 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent
goto out_unlock;
}
+ /*
+ * Find an initialized state to use; there must be at least
+ * one or else the sbsec won't have been initialized.
+ */
+ while (!selinux_initialized(state))
+ state = state->parent;
+
sclass = isec->sclass;
task_sid = isec->task_sid;
sid = isec->sid;
@@ -1498,8 +1506,8 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent
goto out_invalid;
}
- rc = inode_doinit_use_xattr(inode, dentry, sbsec->def_sid,
- &sid);
+ rc = inode_doinit_use_xattr(state, inode, dentry,
+ sbsec->def_sid, &sid);
dput(dentry);
if (rc)
goto out;
@@ -1512,8 +1520,8 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent
sid = sbsec->sid;
/* Try to obtain a transition SID. */
- rc = security_transition_sid(current_selinux_state, task_sid, sid,
- sclass, NULL, &sid);
+ rc = security_transition_sid(state, task_sid, sid, sclass,
+ NULL, &sid);
if (rc)
goto out;
break;
@@ -1526,7 +1534,7 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent
if ((sbsec->flags & SE_SBGENFS) &&
(!S_ISLNK(inode->i_mode) ||
- selinux_policycap_genfs_seclabel_symlinks())) {
+ selinux_policycap_genfs_seclabel_symlinks(state))) {
/* We must have a dentry to determine the label on
* procfs inodes */
if (opt_dentry) {
@@ -1553,7 +1561,7 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent
*/
if (!dentry)
goto out_invalid;
- rc = selinux_genfs_get_sid(dentry, sclass,
+ rc = selinux_genfs_get_sid(state, dentry, sclass,
sbsec->flags, &sid);
if (rc) {
dput(dentry);
@@ -1562,8 +1570,9 @@ static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dent
if ((sbsec->flags & SE_SBGENFS_XATTR) &&
(inode->i_opflags & IOP_XATTR)) {
- rc = inode_doinit_use_xattr(inode, dentry,
- sid, &sid);
+ rc = inode_doinit_use_xattr(state, inode,
+ dentry, sid,
+ &sid);
if (rc) {
dput(dentry);
goto out;
diff --git a/security/selinux/include/security.h b/security/selinux/include/security.h
index 4b2ebe31467b..1426302c353d 100644
--- a/security/selinux/include/security.h
+++ b/security/selinux/include/security.h
@@ -245,11 +245,11 @@ static inline bool selinux_policycap_nnp_nosuid_transition(void)
->policycap[POLICYDB_CAP_NNP_NOSUID_TRANSITION]);
}
-static inline bool selinux_policycap_genfs_seclabel_symlinks(void)
+static inline bool
+selinux_policycap_genfs_seclabel_symlinks(struct selinux_state *state)
{
return READ_ONCE(
- current_selinux_state
- ->policycap[POLICYDB_CAP_GENFS_SECLABEL_SYMLINKS]);
+ state->policycap[POLICYDB_CAP_GENFS_SECLABEL_SYMLINKS]);
}
static inline bool selinux_policycap_ioctl_skip_cloexec(void)
--
2.47.1
