Merge tag 'lsm-pr-20240312' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/lsm

Pull lsm updates from Paul Moore:

 - Promote IMA/EVM to a proper LSM

   This is the bulk of the diffstat, and the source of all the changes
   in the VFS code. Prior to the start of the LSM stacking work it was
   important that IMA/EVM were separate from the rest of the LSMs,
   complete with their own hooks, infrastructure, etc. as it was the
   only way to enable IMA/EVM at the same time as a LSM.

   However, now that the bulk of the LSM infrastructure supports
   multiple simultaneous LSMs, we can simplify things greatly by
   bringing IMA/EVM into the LSM infrastructure as proper LSMs. This is
   something I've wanted to see happen for quite some time and Roberto
   was kind enough to put in the work to make it happen.

 - Use the LSM hook default values to simplify the call_int_hook() macro

   Previously the call_int_hook() macro required callers to supply a
   default return value, despite a default value being specified when
   the LSM hook was defined.

   This simplifies the macro by using the defined default return value
   which makes life easier for callers and should also reduce the number
   of return value bugs in the future (we've had a few pop up recently,
   hence this work).

 - Use the KMEM_CACHE() macro instead of kmem_cache_create()

   The guidance appears to be to use the KMEM_CACHE() macro when
   possible and there is no reason why we can't use the macro, so let's
   use it.

 - Fix a number of comment typos in the LSM hook comment blocks

   Not much to say here, we fixed some questionable grammar decisions in
   the LSM hook comment blocks.

* tag 'lsm-pr-20240312' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/lsm: (28 commits)
  cred: Use KMEM_CACHE() instead of kmem_cache_create()
  lsm: use default hook return value in call_int_hook()
  lsm: fix typos in security/security.c comment headers
  integrity: Remove LSM
  ima: Make it independent from 'integrity' LSM
  evm: Make it independent from 'integrity' LSM
  evm: Move to LSM infrastructure
  ima: Move IMA-Appraisal to LSM infrastructure
  ima: Move to LSM infrastructure
  integrity: Move integrity_kernel_module_request() to IMA
  security: Introduce key_post_create_or_update hook
  security: Introduce inode_post_remove_acl hook
  security: Introduce inode_post_set_acl hook
  security: Introduce inode_post_create_tmpfile hook
  security: Introduce path_post_mknod hook
  security: Introduce file_release hook
  security: Introduce file_post_open hook
  security: Introduce inode_post_removexattr hook
  security: Introduce inode_post_setattr hook
  security: Align inode_setattr hook definition with EVM
  ...

Author: torvalds

fs/attr.c

@@ -16,8 +16,6 @@
 #include <linux/fcntl.h>
 #include <linux/filelock.h>
 #include <linux/security.h>
-#include <linux/evm.h>
-#include <linux/ima.h>
 
 #include "internal.h"
 
@@ -502,8 +500,7 @@ int notify_change(struct mnt_idmap *idmap, struct dentry *dentry,
 
 	if (!error) {
 		fsnotify_change(dentry, ia_valid);
-		ima_inode_post_setattr(idmap, dentry);
-		evm_inode_post_setattr(dentry, ia_valid);
+		security_inode_post_setattr(idmap, dentry, ia_valid);
 	}
 
 	return error;

fs/file_table.c

@@ -26,7 +26,6 @@
 #include <linux/percpu_counter.h>
 #include <linux/percpu.h>
 #include <linux/task_work.h>
-#include <linux/ima.h>
 #include <linux/swap.h>
 #include <linux/kmemleak.h>
 
@@ -414,7 +413,7 @@ static void __fput(struct file *file)
 	eventpoll_release(file);
 	locks_remove_file(file);
 
-	ima_file_free(file);
+	security_file_release(file);
 	if (unlikely(file->f_flags & FASYNC)) {
 		if (file->f_op->fasync)
 			file->f_op->fasync(-1, file, 0);

fs/namei.c

@@ -27,7 +27,6 @@
 #include <linux/fsnotify.h>
 #include <linux/personality.h>
 #include <linux/security.h>
-#include <linux/ima.h>
 #include <linux/syscalls.h>
 #include <linux/mount.h>
 #include <linux/audit.h>
@@ -3642,7 +3641,7 @@ static int do_open(struct nameidata *nd,
 	if (!error && !(file->f_mode & FMODE_OPENED))
 		error = vfs_open(&nd->path, file);
 	if (!error)
-		error = ima_file_check(file, op->acc_mode);
+		error = security_file_post_open(file, op->acc_mode);
 	if (!error && do_truncate)
 		error = handle_truncate(idmap, file);
 	if (unlikely(error > 0)) {
@@ -3705,7 +3704,7 @@ static int vfs_tmpfile(struct mnt_idmap *idmap,
 		inode->i_state |= I_LINKABLE;
 		spin_unlock(&inode->i_lock);
 	}
-	ima_post_create_tmpfile(idmap, inode);
+	security_inode_post_create_tmpfile(idmap, inode);
 	return 0;
 }
 
@@ -4051,8 +4050,6 @@ static int do_mknodat(int dfd, struct filename *name, umode_t mode,
 		case 0: case S_IFREG:
 			error = vfs_create(idmap, path.dentry->d_inode,
 					   dentry, mode, true);
-			if (!error)
-				ima_post_path_mknod(idmap, dentry);
 			break;
 		case S_IFCHR: case S_IFBLK:
 			error = vfs_mknod(idmap, path.dentry->d_inode,
@@ -4063,6 +4060,11 @@ static int do_mknodat(int dfd, struct filename *name, umode_t mode,
 					  dentry, mode, 0);
 			break;
 	}
+
+	if (error)
+		goto out2;
+
+	security_path_post_mknod(idmap, dentry);
 out2:
 	done_path_create(&path, dentry);
 	if (retry_estale(error, lookup_flags)) {

fs/nfsd/vfs.c

@@ -25,7 +25,6 @@
 #include <linux/posix_acl_xattr.h>
 #include <linux/xattr.h>
 #include <linux/jhash.h>
-#include <linux/ima.h>
 #include <linux/pagemap.h>
 #include <linux/slab.h>
 #include <linux/uaccess.h>
@@ -895,7 +894,7 @@ __nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type,
 		goto out;
 	}
 
-	host_err = ima_file_check(file, may_flags);
+	host_err = security_file_post_open(file, may_flags);
 	if (host_err) {
 		fput(file);
 		goto out;

fs/open.c

@@ -29,7 +29,6 @@
 #include <linux/audit.h>
 #include <linux/falloc.h>
 #include <linux/fs_struct.h>
-#include <linux/ima.h>
 #include <linux/dnotify.h>
 #include <linux/compat.h>
 #include <linux/mnt_idmapping.h>

fs/posix_acl.c

@@ -26,7 +26,6 @@
 #include <linux/mnt_idmapping.h>
 #include <linux/iversion.h>
 #include <linux/security.h>
-#include <linux/evm.h>
 #include <linux/fsnotify.h>
 #include <linux/filelock.h>
 
@@ -1137,7 +1136,7 @@ int vfs_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
 		error = -EIO;
 	if (!error) {
 		fsnotify_xattr(dentry);
-		evm_inode_post_set_acl(dentry, acl_name, kacl);
+		security_inode_post_set_acl(dentry, acl_name, kacl);
 	}
 
 out_inode_unlock:
@@ -1245,7 +1244,7 @@ int vfs_remove_acl(struct mnt_idmap *idmap, struct dentry *dentry,
 		error = -EIO;
 	if (!error) {
 		fsnotify_xattr(dentry);
-		evm_inode_post_remove_acl(idmap, dentry, acl_name);
+		security_inode_post_remove_acl(idmap, dentry, acl_name);
 	}
 
 out_inode_unlock:

fs/xattr.c

@@ -16,7 +16,6 @@
 #include <linux/mount.h>
 #include <linux/namei.h>
 #include <linux/security.h>
-#include <linux/evm.h>
 #include <linux/syscalls.h>
 #include <linux/export.h>
 #include <linux/fsnotify.h>
@@ -552,11 +551,11 @@ __vfs_removexattr_locked(struct mnt_idmap *idmap,
 		goto out;
 
 	error = __vfs_removexattr(idmap, dentry, name);
+	if (error)
+		return error;
 
-	if (!error) {
-		fsnotify_xattr(dentry);
-		evm_inode_post_removexattr(dentry, name);
-	}
+	fsnotify_xattr(dentry);
+	security_inode_post_removexattr(dentry, name);
 
 out:
 	return error;

include/linux/evm.h

@@ -12,52 +12,12 @@
 #include <linux/integrity.h>
 #include <linux/xattr.h>
 
-struct integrity_iint_cache;
-
 #ifdef CONFIG_EVM
 extern int evm_set_key(void *key, size_t keylen);
 extern enum integrity_status evm_verifyxattr(struct dentry *dentry,
 					     const char *xattr_name,
 					     void *xattr_value,
-					     size_t xattr_value_len,
-					     struct integrity_iint_cache *iint);
-extern int evm_inode_setattr(struct mnt_idmap *idmap,
-			     struct dentry *dentry, struct iattr *attr);
-extern void evm_inode_post_setattr(struct dentry *dentry, int ia_valid);
-extern int evm_inode_setxattr(struct mnt_idmap *idmap,
-			      struct dentry *dentry, const char *name,
-			      const void *value, size_t size);
-extern void evm_inode_post_setxattr(struct dentry *dentry,
-				    const char *xattr_name,
-				    const void *xattr_value,
-				    size_t xattr_value_len);
-extern int evm_inode_copy_up_xattr(const char *name);
-extern int evm_inode_removexattr(struct mnt_idmap *idmap,
-				 struct dentry *dentry, const char *xattr_name);
-extern void evm_inode_post_removexattr(struct dentry *dentry,
-				       const char *xattr_name);
-static inline void evm_inode_post_remove_acl(struct mnt_idmap *idmap,
-					     struct dentry *dentry,
-					     const char *acl_name)
-{
-	evm_inode_post_removexattr(dentry, acl_name);
-}
-extern int evm_inode_set_acl(struct mnt_idmap *idmap,
-			     struct dentry *dentry, const char *acl_name,
-			     struct posix_acl *kacl);
-static inline int evm_inode_remove_acl(struct mnt_idmap *idmap,
-				       struct dentry *dentry,
-				       const char *acl_name)
-{
-	return evm_inode_set_acl(idmap, dentry, acl_name, NULL);
-}
-static inline void evm_inode_post_set_acl(struct dentry *dentry,
-					  const char *acl_name,
-					  struct posix_acl *kacl)
-{
-	return evm_inode_post_setxattr(dentry, acl_name, NULL, 0);
-}
-
+					     size_t xattr_value_len);
 int evm_inode_init_security(struct inode *inode, struct inode *dir,
 			    const struct qstr *qstr, struct xattr *xattrs,
 			    int *xattr_count);
@@ -85,85 +45,12 @@ static inline int evm_set_key(void *key, size_t keylen)
 static inline enum integrity_status evm_verifyxattr(struct dentry *dentry,
 						    const char *xattr_name,
 						    void *xattr_value,
-						    size_t xattr_value_len,
-					struct integrity_iint_cache *iint)
+						    size_t xattr_value_len)
 {
 	return INTEGRITY_UNKNOWN;
 }
 #endif
 
-static inline int evm_inode_setattr(struct mnt_idmap *idmap,
-				    struct dentry *dentry, struct iattr *attr)
-{
-	return 0;
-}
-
-static inline void evm_inode_post_setattr(struct dentry *dentry, int ia_valid)
-{
-	return;
-}
-
-static inline int evm_inode_setxattr(struct mnt_idmap *idmap,
-				     struct dentry *dentry, const char *name,
-				     const void *value, size_t size)
-{
-	return 0;
-}
-
-static inline void evm_inode_post_setxattr(struct dentry *dentry,
-					   const char *xattr_name,
-					   const void *xattr_value,
-					   size_t xattr_value_len)
-{
-	return;
-}
-
-static inline int  evm_inode_copy_up_xattr(const char *name)
-{
-	return 0;
-}
-
-static inline int evm_inode_removexattr(struct mnt_idmap *idmap,
-					struct dentry *dentry,
-					const char *xattr_name)
-{
-	return 0;
-}
-
-static inline void evm_inode_post_removexattr(struct dentry *dentry,
-					      const char *xattr_name)
-{
-	return;
-}
-
-static inline void evm_inode_post_remove_acl(struct mnt_idmap *idmap,
-					     struct dentry *dentry,
-					     const char *acl_name)
-{
-	return;
-}
-
-static inline int evm_inode_set_acl(struct mnt_idmap *idmap,
-				    struct dentry *dentry, const char *acl_name,
-				    struct posix_acl *kacl)
-{
-	return 0;
-}
-
-static inline int evm_inode_remove_acl(struct mnt_idmap *idmap,
-				       struct dentry *dentry,
-				       const char *acl_name)
-{
-	return 0;
-}
-
-static inline void evm_inode_post_set_acl(struct dentry *dentry,
-					  const char *acl_name,
-					  struct posix_acl *kacl)
-{
-	return;
-}
-
 static inline int evm_inode_init_security(struct inode *inode, struct inode *dir,
 					  const struct qstr *qstr,
 					  struct xattr *xattrs,