+++ /dev/null
-From d46fe169d6c766a600e6037e8fa87ac94d0f8bd8 Mon Sep 17 00:00:00 2001
-From: Sasha Levin <sashal@kernel.org>
-Date: Thu, 22 Apr 2021 17:41:16 +0200
-Subject: fs,security: Add sb_delete hook
-MIME-Version: 1.0
-Content-Type: text/plain; charset=UTF-8
-Content-Transfer-Encoding: 8bit
-
-From: Mickaël Salaün <mic@linux.microsoft.com>
-
-[ Upstream commit 83e804f0bfee2247b1c0aa64845c81a38562da7a ]
-
-The sb_delete security hook is called when shutting down a superblock,
-which may be useful to release kernel objects tied to the superblock's
-lifetime (e.g. inodes).
-
-This new hook is needed by Landlock to release (ephemerally) tagged
-struct inodes. This comes from the unprivileged nature of Landlock
-described in the next commit.
-
-Cc: Al Viro <viro@zeniv.linux.org.uk>
-Cc: James Morris <jmorris@namei.org>
-Signed-off-by: Mickaël Salaün <mic@linux.microsoft.com>
-Reviewed-by: Jann Horn <jannh@google.com>
-Acked-by: Serge Hallyn <serge@hallyn.com>
-Reviewed-by: Kees Cook <keescook@chromium.org>
-Link: https://lore.kernel.org/r/20210422154123.13086-7-mic@digikod.net
-Signed-off-by: James Morris <jamorris@linux.microsoft.com>
-Stable-dep-of: d7e7b9af104c ("fscrypt: stop using keyrings subsystem for fscrypt_master_key")
-Signed-off-by: Sasha Levin <sashal@kernel.org>
----
- fs/super.c | 1 +
- include/linux/lsm_hook_defs.h | 1 +
- include/linux/lsm_hooks.h | 3 +++
- include/linux/security.h | 4 ++++
- security/security.c | 5 +++++
- 5 files changed, 14 insertions(+)
-
-diff --git a/fs/super.c b/fs/super.c
-index bae3fe80f852..705be5d0600e 100644
---- a/fs/super.c
-+++ b/fs/super.c
-@@ -454,6 +454,7 @@ void generic_shutdown_super(struct super_block *sb)
- evict_inodes(sb);
- /* only nonzero refcount inodes can have marks */
- fsnotify_sb_delete(sb);
-+ security_sb_delete(sb);
-
- if (sb->s_dio_done_wq) {
- destroy_workqueue(sb->s_dio_done_wq);
-diff --git a/include/linux/lsm_hook_defs.h b/include/linux/lsm_hook_defs.h
-index d13631a5e908..d74ffcdc7be6 100644
---- a/include/linux/lsm_hook_defs.h
-+++ b/include/linux/lsm_hook_defs.h
-@@ -59,6 +59,7 @@ LSM_HOOK(int, 0, fs_context_dup, struct fs_context *fc,
- LSM_HOOK(int, -ENOPARAM, fs_context_parse_param, struct fs_context *fc,
- struct fs_parameter *param)
- LSM_HOOK(int, 0, sb_alloc_security, struct super_block *sb)
-+LSM_HOOK(void, LSM_RET_VOID, sb_delete, struct super_block *sb)
- LSM_HOOK(void, LSM_RET_VOID, sb_free_security, struct super_block *sb)
- LSM_HOOK(void, LSM_RET_VOID, sb_free_mnt_opts, void *mnt_opts)
- LSM_HOOK(int, 0, sb_eat_lsm_opts, char *orig, void **mnt_opts)
-diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
-index 64cdf4d7bfb3..73abbdd94c13 100644
---- a/include/linux/lsm_hooks.h
-+++ b/include/linux/lsm_hooks.h
-@@ -108,6 +108,9 @@
- * allocated.
- * @sb contains the super_block structure to be modified.
- * Return 0 if operation was successful.
-+ * @sb_delete:
-+ * Release objects tied to a superblock (e.g. inodes).
-+ * @sb contains the super_block structure being released.
- * @sb_free_security:
- * Deallocate and clear the sb->s_security field.
- * @sb contains the super_block structure to be modified.
-diff --git a/include/linux/security.h b/include/linux/security.h
-index e9b4b5410614..f37087d76913 100644
---- a/include/linux/security.h
-+++ b/include/linux/security.h
-@@ -290,6 +290,7 @@ void security_bprm_committed_creds(struct linux_binprm *bprm);
- int security_fs_context_dup(struct fs_context *fc, struct fs_context *src_fc);
- int security_fs_context_parse_param(struct fs_context *fc, struct fs_parameter *param);
- int security_sb_alloc(struct super_block *sb);
-+void security_sb_delete(struct super_block *sb);
- void security_sb_free(struct super_block *sb);
- void security_free_mnt_opts(void **mnt_opts);
- int security_sb_eat_lsm_opts(char *options, void **mnt_opts);
-@@ -622,6 +623,9 @@ static inline int security_sb_alloc(struct super_block *sb)
- return 0;
- }
-
-+static inline void security_sb_delete(struct super_block *sb)
-+{ }
-+
- static inline void security_sb_free(struct super_block *sb)
- { }
-
-diff --git a/security/security.c b/security/security.c
-index 8ea826ea6167..771ec21a6e0b 100644
---- a/security/security.c
-+++ b/security/security.c
-@@ -885,6 +885,11 @@ int security_sb_alloc(struct super_block *sb)
- return call_int_hook(sb_alloc_security, 0, sb);
- }
-
-+void security_sb_delete(struct super_block *sb)
-+{
-+ call_void_hook(sb_delete, sb);
-+}
-+
- void security_sb_free(struct super_block *sb)
- {
- call_void_hook(sb_free_security, sb);
---
-2.35.1
-