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Diffstat (limited to 'security/selinux/hooks.c')
-rw-r--r--security/selinux/hooks.c164
1 files changed, 129 insertions, 35 deletions
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 644b17ec9e63..ddd097790d47 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -484,6 +484,55 @@ static int selinux_is_sblabel_mnt(struct super_block *sb)
}
}
+static int sb_check_xattr_support(struct super_block *sb)
+{
+ struct superblock_security_struct *sbsec = sb->s_security;
+ struct dentry *root = sb->s_root;
+ struct inode *root_inode = d_backing_inode(root);
+ u32 sid;
+ int rc;
+
+ /*
+ * Make sure that the xattr handler exists and that no
+ * error other than -ENODATA is returned by getxattr on
+ * the root directory. -ENODATA is ok, as this may be
+ * the first boot of the SELinux kernel before we have
+ * assigned xattr values to the filesystem.
+ */
+ if (!(root_inode->i_opflags & IOP_XATTR)) {
+ pr_warn("SELinux: (dev %s, type %s) has no xattr support\n",
+ sb->s_id, sb->s_type->name);
+ goto fallback;
+ }
+
+ rc = __vfs_getxattr(root, root_inode, XATTR_NAME_SELINUX, NULL, 0);
+ if (rc < 0 && rc != -ENODATA) {
+ if (rc == -EOPNOTSUPP) {
+ pr_warn("SELinux: (dev %s, type %s) has no security xattr handler\n",
+ sb->s_id, sb->s_type->name);
+ goto fallback;
+ } else {
+ pr_warn("SELinux: (dev %s, type %s) getxattr errno %d\n",
+ sb->s_id, sb->s_type->name, -rc);
+ return rc;
+ }
+ }
+ return 0;
+
+fallback:
+ /* No xattr support - try to fallback to genfs if possible. */
+ rc = security_genfs_sid(&selinux_state, sb->s_type->name, "/",
+ SECCLASS_DIR, &sid);
+ if (rc)
+ return -EOPNOTSUPP;
+
+ pr_warn("SELinux: (dev %s, type %s) falling back to genfs\n",
+ sb->s_id, sb->s_type->name);
+ sbsec->behavior = SECURITY_FS_USE_GENFS;
+ sbsec->sid = sid;
+ return 0;
+}
+
static int sb_finish_set_opts(struct super_block *sb)
{
struct superblock_security_struct *sbsec = sb->s_security;
@@ -492,30 +541,9 @@ static int sb_finish_set_opts(struct super_block *sb)
int rc = 0;
if (sbsec->behavior == SECURITY_FS_USE_XATTR) {
- /* Make sure that the xattr handler exists and that no
- error other than -ENODATA is returned by getxattr on
- the root directory. -ENODATA is ok, as this may be
- the first boot of the SELinux kernel before we have
- assigned xattr values to the filesystem. */
- if (!(root_inode->i_opflags & IOP_XATTR)) {
- pr_warn("SELinux: (dev %s, type %s) has no "
- "xattr support\n", sb->s_id, sb->s_type->name);
- rc = -EOPNOTSUPP;
- goto out;
- }
-
- rc = __vfs_getxattr(root, root_inode, XATTR_NAME_SELINUX, NULL, 0);
- if (rc < 0 && rc != -ENODATA) {
- if (rc == -EOPNOTSUPP)
- pr_warn("SELinux: (dev %s, type "
- "%s) has no security xattr handler\n",
- sb->s_id, sb->s_type->name);
- else
- pr_warn("SELinux: (dev %s, type "
- "%s) getxattr errno %d\n", sb->s_id,
- sb->s_type->name, -rc);
- goto out;
- }
+ rc = sb_check_xattr_support(sb);
+ if (rc)
+ return rc;
}
sbsec->flags |= SE_SBINITIALIZED;
@@ -554,7 +582,6 @@ static int sb_finish_set_opts(struct super_block *sb)
spin_lock(&sbsec->isec_lock);
}
spin_unlock(&sbsec->isec_lock);
-out:
return rc;
}
@@ -1120,7 +1147,8 @@ static inline u16 inode_mode_to_security_class(umode_t mode)
static inline int default_protocol_stream(int protocol)
{
- return (protocol == IPPROTO_IP || protocol == IPPROTO_TCP);
+ return (protocol == IPPROTO_IP || protocol == IPPROTO_TCP ||
+ protocol == IPPROTO_MPTCP);
}
static inline int default_protocol_dgram(int protocol)
@@ -2934,6 +2962,62 @@ static int selinux_inode_init_security(struct inode *inode, struct inode *dir,
return 0;
}
+static int selinux_inode_init_security_anon(struct inode *inode,
+ const struct qstr *name,
+ const struct inode *context_inode)
+{
+ const struct task_security_struct *tsec = selinux_cred(current_cred());
+ struct common_audit_data ad;
+ struct inode_security_struct *isec;
+ int rc;
+
+ if (unlikely(!selinux_initialized(&selinux_state)))
+ return 0;
+
+ isec = selinux_inode(inode);
+
+ /*
+ * We only get here once per ephemeral inode. The inode has
+ * been initialized via inode_alloc_security but is otherwise
+ * untouched.
+ */
+
+ if (context_inode) {
+ struct inode_security_struct *context_isec =
+ selinux_inode(context_inode);
+ if (context_isec->initialized != LABEL_INITIALIZED) {
+ pr_err("SELinux: context_inode is not initialized");
+ return -EACCES;
+ }
+
+ isec->sclass = context_isec->sclass;
+ isec->sid = context_isec->sid;
+ } else {
+ isec->sclass = SECCLASS_ANON_INODE;
+ rc = security_transition_sid(
+ &selinux_state, tsec->sid, tsec->sid,
+ isec->sclass, name, &isec->sid);
+ if (rc)
+ return rc;
+ }
+
+ isec->initialized = LABEL_INITIALIZED;
+ /*
+ * Now that we've initialized security, check whether we're
+ * allowed to actually create this type of anonymous inode.
+ */
+
+ ad.type = LSM_AUDIT_DATA_INODE;
+ ad.u.inode = inode;
+
+ return avc_has_perm(&selinux_state,
+ tsec->sid,
+ isec->sid,
+ isec->sclass,
+ FILE__CREATE,
+ &ad);
+}
+
static int selinux_inode_create(struct inode *dir, struct dentry *dentry, umode_t mode)
{
return may_create(dir, dentry, SECCLASS_FILE);
@@ -3119,7 +3203,8 @@ static bool has_cap_mac_admin(bool audit)
return true;
}
-static int selinux_inode_setxattr(struct dentry *dentry, const char *name,
+static int selinux_inode_setxattr(struct user_namespace *mnt_userns,
+ struct dentry *dentry, const char *name,
const void *value, size_t size, int flags)
{
struct inode *inode = d_backing_inode(dentry);
@@ -3140,13 +3225,13 @@ static int selinux_inode_setxattr(struct dentry *dentry, const char *name,
}
if (!selinux_initialized(&selinux_state))
- return (inode_owner_or_capable(inode) ? 0 : -EPERM);
+ return (inode_owner_or_capable(mnt_userns, inode) ? 0 : -EPERM);
sbsec = inode->i_sb->s_security;
if (!(sbsec->flags & SBLABEL_MNT))
return -EOPNOTSUPP;
- if (!inode_owner_or_capable(inode))
+ if (!inode_owner_or_capable(mnt_userns, inode))
return -EPERM;
ad.type = LSM_AUDIT_DATA_DENTRY;
@@ -3267,10 +3352,11 @@ static int selinux_inode_listxattr(struct dentry *dentry)
return dentry_has_perm(cred, dentry, FILE__GETATTR);
}
-static int selinux_inode_removexattr(struct dentry *dentry, const char *name)
+static int selinux_inode_removexattr(struct user_namespace *mnt_userns,
+ struct dentry *dentry, const char *name)
{
if (strcmp(name, XATTR_NAME_SELINUX)) {
- int rc = cap_inode_removexattr(dentry, name);
+ int rc = cap_inode_removexattr(mnt_userns, dentry, name);
if (rc)
return rc;
@@ -3336,7 +3422,9 @@ static int selinux_path_notify(const struct path *path, u64 mask,
*
* Permission check is handled by selinux_inode_getxattr hook.
*/
-static int selinux_inode_getsecurity(struct inode *inode, const char *name, void **buffer, bool alloc)
+static int selinux_inode_getsecurity(struct user_namespace *mnt_userns,
+ struct inode *inode, const char *name,
+ void **buffer, bool alloc)
{
u32 size;
int error;
@@ -3413,6 +3501,10 @@ static int selinux_inode_setsecurity(struct inode *inode, const char *name,
static int selinux_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size)
{
const int len = sizeof(XATTR_NAME_SELINUX);
+
+ if (!selinux_initialized(&selinux_state))
+ return 0;
+
if (buffer && len <= buffer_size)
memcpy(buffer, XATTR_NAME_SELINUX, len);
return len;
@@ -6526,14 +6618,15 @@ static int selinux_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen
*/
static int selinux_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
{
- return __vfs_setxattr_noperm(dentry, XATTR_NAME_SELINUX, ctx, ctxlen, 0);
+ return __vfs_setxattr_noperm(&init_user_ns, dentry, XATTR_NAME_SELINUX,
+ ctx, ctxlen, 0);
}
static int selinux_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
{
int len = 0;
- len = selinux_inode_getsecurity(inode, XATTR_SELINUX_SUFFIX,
- ctx, true);
+ len = selinux_inode_getsecurity(&init_user_ns, inode,
+ XATTR_SELINUX_SUFFIX, ctx, true);
if (len < 0)
return len;
*ctxlen = len;
@@ -7000,6 +7093,7 @@ static struct security_hook_list selinux_hooks[] __lsm_ro_after_init = {
LSM_HOOK_INIT(inode_free_security, selinux_inode_free_security),
LSM_HOOK_INIT(inode_init_security, selinux_inode_init_security),
+ LSM_HOOK_INIT(inode_init_security_anon, selinux_inode_init_security_anon),
LSM_HOOK_INIT(inode_create, selinux_inode_create),
LSM_HOOK_INIT(inode_link, selinux_inode_link),
LSM_HOOK_INIT(inode_unlink, selinux_inode_unlink),
generated by cgit v1.2.3 (git 2.46.0) at 2025-07-01 20:06:19 +0000