@@ -48,6 +48,8 @@ obj-$(CONFIG_COREDUMP) += coredump.o
obj-$(CONFIG_SYSCTL) += drop_caches.o
obj-$(CONFIG_FHANDLE) += fhandle.o
+obj-$(CONFIG_FS_RICHACL) += richacl.o
+richacl-y := richacl_base.o
obj-y += quota/
new file mode 100644
@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2006, 2010 Novell, Inc.
+ * Copyright (C) 2015 Red Hat, Inc.
+ * Written by Andreas Gruenbacher <agruen@kernel.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+
+#include <linux/sched.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/slab.h>
+#include <linux/richacl.h>
+
+MODULE_LICENSE("GPL");
+
+/**
+ * richacl_alloc - allocate a richacl
+ * @count: number of entries
+ */
+struct richacl *
+richacl_alloc(int count, gfp_t gfp)
+{
+ size_t size = sizeof(struct richacl) + count * sizeof(struct richace);
+ struct richacl *acl = kzalloc(size, gfp);
+
+ if (acl) {
+ atomic_set(&acl->a_refcount, 1);
+ acl->a_count = count;
+ }
+ return acl;
+}
+EXPORT_SYMBOL_GPL(richacl_alloc);
+
+/**
+ * richacl_clone - create a copy of a richacl
+ */
+struct richacl *
+richacl_clone(const struct richacl *acl, gfp_t gfp)
+{
+ int count = acl->a_count;
+ size_t size = sizeof(struct richacl) + count * sizeof(struct richace);
+ struct richacl *dup = kmalloc(size, gfp);
+
+ if (dup) {
+ memcpy(dup, acl, size);
+ atomic_set(&dup->a_refcount, 1);
+ }
+ return dup;
+}
+
+/**
+ * richace_copy - copy an acl entry
+ */
+void
+richace_copy(struct richace *to, const struct richace *from)
+{
+ memcpy(to, from, sizeof(struct richace));
+}
new file mode 100644
@@ -0,0 +1,256 @@
+/*
+ * Copyright (C) 2006, 2010 Novell, Inc.
+ * Copyright (C) 2015 Red Hat, Inc.
+ * Written by Andreas Gruenbacher <agruen@kernel.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+
+#ifndef __RICHACL_H
+#define __RICHACL_H
+
+#define RICHACE_OWNER_SPECIAL_ID 0
+#define RICHACE_GROUP_SPECIAL_ID 1
+#define RICHACE_EVERYONE_SPECIAL_ID 2
+
+struct richace {
+ unsigned short e_type;
+ unsigned short e_flags;
+ unsigned int e_mask;
+ union {
+ kuid_t uid;
+ kgid_t gid;
+ unsigned int special;
+ } e_id;
+};
+
+struct richacl {
+ atomic_t a_refcount;
+ unsigned int a_owner_mask;
+ unsigned int a_group_mask;
+ unsigned int a_other_mask;
+ unsigned short a_count;
+ unsigned short a_flags;
+ struct richace a_entries[0];
+};
+
+#define richacl_for_each_entry(_ace, _acl) \
+ for (_ace = (_acl)->a_entries; \
+ _ace != (_acl)->a_entries + (_acl)->a_count; \
+ _ace++)
+
+#define richacl_for_each_entry_reverse(_ace, _acl) \
+ for (_ace = (_acl)->a_entries + (_acl)->a_count - 1; \
+ _ace != (_acl)->a_entries - 1; \
+ _ace--)
+
+/* a_flags values */
+#define RICHACL_WRITE_THROUGH 0x40
+#define RICHACL_MASKED 0x80
+
+#define RICHACL_VALID_FLAGS ( \
+ RICHACL_WRITE_THROUGH | \
+ RICHACL_MASKED)
+
+/* e_type values */
+#define RICHACE_ACCESS_ALLOWED_ACE_TYPE 0x0000
+#define RICHACE_ACCESS_DENIED_ACE_TYPE 0x0001
+
+/* e_flags bitflags */
+#define RICHACE_FILE_INHERIT_ACE 0x0001
+#define RICHACE_DIRECTORY_INHERIT_ACE 0x0002
+#define RICHACE_NO_PROPAGATE_INHERIT_ACE 0x0004
+#define RICHACE_INHERIT_ONLY_ACE 0x0008
+#define RICHACE_IDENTIFIER_GROUP 0x0040
+#define RICHACE_SPECIAL_WHO 0x4000
+
+#define RICHACE_VALID_FLAGS ( \
+ RICHACE_FILE_INHERIT_ACE | \
+ RICHACE_DIRECTORY_INHERIT_ACE | \
+ RICHACE_NO_PROPAGATE_INHERIT_ACE | \
+ RICHACE_INHERIT_ONLY_ACE | \
+ RICHACE_IDENTIFIER_GROUP | \
+ RICHACE_SPECIAL_WHO)
+
+#define RICHACE_INHERITANCE_FLAGS ( \
+ RICHACE_FILE_INHERIT_ACE | \
+ RICHACE_DIRECTORY_INHERIT_ACE | \
+ RICHACE_NO_PROPAGATE_INHERIT_ACE | \
+ RICHACE_INHERIT_ONLY_ACE )
+
+/* e_mask bitflags */
+#define RICHACE_READ_DATA 0x00000001
+#define RICHACE_LIST_DIRECTORY 0x00000001
+#define RICHACE_WRITE_DATA 0x00000002
+#define RICHACE_ADD_FILE 0x00000002
+#define RICHACE_APPEND_DATA 0x00000004
+#define RICHACE_ADD_SUBDIRECTORY 0x00000004
+#define RICHACE_READ_NAMED_ATTRS 0x00000008
+#define RICHACE_WRITE_NAMED_ATTRS 0x00000010
+#define RICHACE_EXECUTE 0x00000020
+#define RICHACE_DELETE_CHILD 0x00000040
+#define RICHACE_READ_ATTRIBUTES 0x00000080
+#define RICHACE_WRITE_ATTRIBUTES 0x00000100
+#define RICHACE_WRITE_RETENTION 0x00000200
+#define RICHACE_WRITE_RETENTION_HOLD 0x00000400
+#define RICHACE_DELETE 0x00010000
+#define RICHACE_READ_ACL 0x00020000
+#define RICHACE_WRITE_ACL 0x00040000
+#define RICHACE_WRITE_OWNER 0x00080000
+#define RICHACE_SYNCHRONIZE 0x00100000
+
+/* Valid RICHACE_* flags for directories and non-directories */
+#define RICHACE_VALID_MASK ( \
+ RICHACE_READ_DATA | RICHACE_LIST_DIRECTORY | \
+ RICHACE_WRITE_DATA | RICHACE_ADD_FILE | \
+ RICHACE_APPEND_DATA | RICHACE_ADD_SUBDIRECTORY | \
+ RICHACE_READ_NAMED_ATTRS | \
+ RICHACE_WRITE_NAMED_ATTRS | \
+ RICHACE_EXECUTE | \
+ RICHACE_DELETE_CHILD | \
+ RICHACE_READ_ATTRIBUTES | \
+ RICHACE_WRITE_ATTRIBUTES | \
+ RICHACE_WRITE_RETENTION | \
+ RICHACE_WRITE_RETENTION_HOLD | \
+ RICHACE_DELETE | \
+ RICHACE_READ_ACL | \
+ RICHACE_WRITE_ACL | \
+ RICHACE_WRITE_OWNER | \
+ RICHACE_SYNCHRONIZE)
+
+/**
+ * richacl_get - grab another reference to a richacl handle
+ */
+static inline struct richacl *
+richacl_get(struct richacl *acl)
+{
+ if (acl)
+ atomic_inc(&acl->a_refcount);
+ return acl;
+}
+
+/**
+ * richacl_put - free a richacl handle
+ */
+static inline void
+richacl_put(struct richacl *acl)
+{
+ if (acl && atomic_dec_and_test(&acl->a_refcount))
+ kfree(acl);
+}
+
+/**
+ * richace_is_owner - check if @ace is an OWNER@ entry
+ */
+static inline bool
+richace_is_owner(const struct richace *ace)
+{
+ return (ace->e_flags & RICHACE_SPECIAL_WHO) &&
+ ace->e_id.special == RICHACE_OWNER_SPECIAL_ID;
+}
+
+/**
+ * richace_is_group - check if @ace is a GROUP@ entry
+ */
+static inline bool
+richace_is_group(const struct richace *ace)
+{
+ return (ace->e_flags & RICHACE_SPECIAL_WHO) &&
+ ace->e_id.special == RICHACE_GROUP_SPECIAL_ID;
+}
+
+/**
+ * richace_is_everyone - check if @ace is an EVERYONE@ entry
+ */
+static inline bool
+richace_is_everyone(const struct richace *ace)
+{
+ return (ace->e_flags & RICHACE_SPECIAL_WHO) &&
+ ace->e_id.special == RICHACE_EVERYONE_SPECIAL_ID;
+}
+
+/**
+ * richace_is_unix_user - check if @ace applies to a specific user
+ */
+static inline bool
+richace_is_unix_user(const struct richace *ace)
+{
+ return !(ace->e_flags & RICHACE_SPECIAL_WHO) &&
+ !(ace->e_flags & RICHACE_IDENTIFIER_GROUP);
+}
+
+/**
+ * richace_is_unix_group - check if @ace applies to a specific group
+ */
+static inline bool
+richace_is_unix_group(const struct richace *ace)
+{
+ return !(ace->e_flags & RICHACE_SPECIAL_WHO) &&
+ (ace->e_flags & RICHACE_IDENTIFIER_GROUP);
+}
+
+/**
+ * richace_is_inherit_only - check if @ace is for inheritance only
+ *
+ * ACEs with the %RICHACE_INHERIT_ONLY_ACE flag set have no effect during
+ * permission checking.
+ */
+static inline bool
+richace_is_inherit_only(const struct richace *ace)
+{
+ return ace->e_flags & RICHACE_INHERIT_ONLY_ACE;
+}
+
+/**
+ * richace_is_inheritable - check if @ace is inheritable
+ */
+static inline bool
+richace_is_inheritable(const struct richace *ace)
+{
+ return ace->e_flags & (RICHACE_FILE_INHERIT_ACE |
+ RICHACE_DIRECTORY_INHERIT_ACE);
+}
+
+/**
+ * richace_is_allow - check if @ace is an %ALLOW type entry
+ */
+static inline bool
+richace_is_allow(const struct richace *ace)
+{
+ return ace->e_type == RICHACE_ACCESS_ALLOWED_ACE_TYPE;
+}
+
+/**
+ * richace_is_deny - check if @ace is a %DENY type entry
+ */
+static inline bool
+richace_is_deny(const struct richace *ace)
+{
+ return ace->e_type == RICHACE_ACCESS_DENIED_ACE_TYPE;
+}
+
+/**
+ * richace_is_same_identifier - are both identifiers the same?
+ */
+static inline bool
+richace_is_same_identifier(const struct richace *a, const struct richace *b)
+{
+ return !((a->e_flags ^ b->e_flags) &
+ (RICHACE_SPECIAL_WHO | RICHACE_IDENTIFIER_GROUP)) &&
+ !memcmp(&a->e_id, &b->e_id, sizeof(a->e_id));
+}
+
+extern struct richacl *richacl_alloc(int, gfp_t);
+extern struct richacl *richacl_clone(const struct richacl *, gfp_t);
+extern void richace_copy(struct richace *, const struct richace *);
+
+
+#endif /* __RICHACL_H */