[PATCH RFC -next 02/12] LSM: pass struct path to the inode_setsecctx hook

[Cai Xinchen <caixinchen1@huawei.com>]

The inode_setsecctx hook and its security_inode_setsecctx() caller
in fs/nfsd operate on a dentry even though both have a struct path
available.  The SELinux and Smack implementations write the label
through __vfs_setxattr_locked(), whose idmap argument they hardcode
to &nop_mnt_idmap.

Switch the hook to take a const struct path so that the upcoming
conversion of the xattr helpers to struct path can be reflected
directly in the implementations.  For now the implementations keep
passing &nop_mnt_idmap together with path->dentry to
__vfs_setxattr_locked(), preserving the current behavior; they will
be switched to pass the path itself once the xattr helpers take one.

Assisted-by: opencode: glm-5.3
Signed-off-by: Cai Xinchen <caixinchen1@huawei.com>
---
 fs/nfsd/vfs.c                 | 2 +-
 include/linux/lsm_hook_defs.h | 2 +-
 include/linux/security.h      | 4 ++--
 security/security.c           | 6 +++---
 security/selinux/hooks.c      | 6 +++---
 security/smack/smack_lsm.c    | 6 +++---
 6 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index ed8e04cc794e..922337083fe9 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -625,7 +625,7 @@ nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp,
 			break;
 	}
 	if (attr->na_seclabel && attr->na_seclabel->len)
-		attr->na_labelerr = security_inode_setsecctx(dentry,
+		attr->na_labelerr = security_inode_setsecctx(&path,
 			attr->na_seclabel->data, attr->na_seclabel->len);
 	if (IS_ENABLED(CONFIG_FS_POSIX_ACL) && attr->na_dpacl) {
 		if (!S_ISDIR(inode->i_mode))
diff --git a/include/linux/lsm_hook_defs.h b/include/linux/lsm_hook_defs.h
index f4939137e66b..b22f7928523e 100644
--- a/include/linux/lsm_hook_defs.h
+++ b/include/linux/lsm_hook_defs.h
@@ -314,7 +314,7 @@ LSM_HOOK(int, 0, secctx_to_secid, const char *secdata, u32 seclen, u32 *secid)
 LSM_HOOK(void, LSM_RET_VOID, release_secctx, struct lsm_context *cp)
 LSM_HOOK(void, LSM_RET_VOID, inode_invalidate_secctx, struct inode *inode)
 LSM_HOOK(int, 0, inode_notifysecctx, struct inode *inode, void *ctx, u32 ctxlen)
-LSM_HOOK(int, 0, inode_setsecctx, struct dentry *dentry, void *ctx, u32 ctxlen)
+LSM_HOOK(int, 0, inode_setsecctx, const struct path *path, void *ctx, u32 ctxlen)
 LSM_HOOK(int, -EOPNOTSUPP, inode_getsecctx, struct inode *inode,
 	 struct lsm_context *cp)
 
diff --git a/include/linux/security.h b/include/linux/security.h
index e3c8b4479a0a..6ac9fb634017 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -589,7 +589,7 @@ int security_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid);
 void security_release_secctx(struct lsm_context *cp);
 void security_inode_invalidate_secctx(struct inode *inode);
 int security_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen);
-int security_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen);
+int security_inode_setsecctx(const struct path *path, void *ctx, u32 ctxlen);
 int security_inode_getsecctx(struct inode *inode, struct lsm_context *cp);
 int security_locked_down(enum lockdown_reason what);
 int lsm_fill_user_ctx(struct lsm_ctx __user *uctx, u32 *uctx_len,
@@ -1637,7 +1637,7 @@ static inline int security_inode_notifysecctx(struct inode *inode, void *ctx, u3
 {
 	return -EOPNOTSUPP;
 }
-static inline int security_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
+static inline int security_inode_setsecctx(const struct path *path, void *ctx, u32 ctxlen)
 {
 	return -EOPNOTSUPP;
 }
diff --git a/security/security.c b/security/security.c
index bf0ec31f1047..de3ed5c18802 100644
--- a/security/security.c
+++ b/security/security.c
@@ -4134,7 +4134,7 @@ EXPORT_SYMBOL(security_inode_notifysecctx);
 
 /**
  * security_inode_setsecctx() - Change the security label of an inode
- * @dentry: inode
+ * @path: inode
  * @ctx: secctx
  * @ctxlen: length of secctx
  *
@@ -4148,9 +4148,9 @@ EXPORT_SYMBOL(security_inode_notifysecctx);
  *
  * Return: Returns 0 on success, error on failure.
  */
-int security_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
+int security_inode_setsecctx(const struct path *path, void *ctx, u32 ctxlen)
 {
-	return call_int_hook(inode_setsecctx, dentry, ctx, ctxlen);
+	return call_int_hook(inode_setsecctx, path, ctx, ctxlen);
 }
 EXPORT_SYMBOL(security_inode_setsecctx);
 
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index f2394cf6646e..8af024fe4fb5 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -7166,10 +7166,10 @@ static int selinux_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen
 /*
  *	called with inode->i_mutex locked
  */
-static int selinux_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
+static int selinux_inode_setsecctx(const struct path *path, void *ctx, u32 ctxlen)
 {
-	return __vfs_setxattr_locked(&nop_mnt_idmap, dentry, XATTR_NAME_SELINUX,
-				     ctx, ctxlen, 0, NULL);
+	return __vfs_setxattr_locked(&nop_mnt_idmap, path->dentry,
+				     XATTR_NAME_SELINUX, ctx, ctxlen, 0, NULL);
 }
 
 static int selinux_inode_getsecctx(struct inode *inode, struct lsm_context *cp)
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 4439821a5e57..d9e9f4a52567 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -4978,10 +4978,10 @@ static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
 				       ctxlen, 0);
 }
 
-static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
+static int smack_inode_setsecctx(const struct path *path, void *ctx, u32 ctxlen)
 {
-	return __vfs_setxattr_locked(&nop_mnt_idmap, dentry, XATTR_NAME_SMACK,
-				     ctx, ctxlen, 0, NULL);
+	return __vfs_setxattr_locked(&nop_mnt_idmap, path->dentry,
+				     XATTR_NAME_SMACK, ctx, ctxlen, 0, NULL);
 }
 
 static int smack_inode_getsecctx(struct inode *inode, struct lsm_context *cp)
-- 
2.18.0.huawei.25