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From: Andreas Gruenbacher <agruenba@redhat.com>
To: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Andreas Gruenbacher <agruenba@redhat.com>,
	Christoph Hellwig <hch@infradead.org>,
	"Theodore Ts'o" <tytso@mit.edu>,
	Andreas Dilger <adilger.kernel@dilger.ca>,
	"J. Bruce Fields" <bfields@fieldses.org>,
	Jeff Layton <jlayton@poochiereds.net>,
	Trond Myklebust <trond.myklebust@primarydata.com>,
	Anna Schumaker <anna.schumaker@netapp.com>,
	Dave Chinner <david@fromorbit.com>,
	linux-ext4@vger.kernel.org, xfs@oss.sgi.com,
	linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	linux-nfs@vger.kernel.org, linux-cifs@vger.kernel.org,
	linux-api@vger.kernel.org
Subject: [PATCH v21 18/22] richacl: xattr mapping functions
Date: Tue, 10 May 2016 00:02:51 +0200	[thread overview]
Message-ID: <1462831375-23017-19-git-send-email-agruenba@redhat.com> (raw)
In-Reply-To: <1462831375-23017-1-git-send-email-agruenba@redhat.com>

Map between "system.richacl" xattrs and the in-kernel representation.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
---
 fs/Makefile                        |   2 +-
 fs/richacl_xattr.c                 | 161 +++++++++++++++++++++++++++++++++++++
 include/linux/richacl_xattr.h      |  29 +++++++
 include/uapi/linux/Kbuild          |   1 +
 include/uapi/linux/richacl_xattr.h |  44 ++++++++++
 include/uapi/linux/xattr.h         |   2 +
 6 files changed, 238 insertions(+), 1 deletion(-)
 create mode 100644 fs/richacl_xattr.c
 create mode 100644 include/linux/richacl_xattr.h
 create mode 100644 include/uapi/linux/richacl_xattr.h

diff --git a/fs/Makefile b/fs/Makefile
index 2b3e6f1..262fd67 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -49,7 +49,7 @@ obj-$(CONFIG_COREDUMP)		+= coredump.o
 obj-$(CONFIG_SYSCTL)		+= drop_caches.o
 
 obj-$(CONFIG_FHANDLE)		+= fhandle.o
-obj-$(CONFIG_FS_RICHACL)	+= richacl.o
+obj-$(CONFIG_FS_RICHACL)	+= richacl.o richacl_xattr.o
 
 obj-y				+= quota/
 
diff --git a/fs/richacl_xattr.c b/fs/richacl_xattr.c
new file mode 100644
index 0000000..dc1ad36
--- /dev/null
+++ b/fs/richacl_xattr.c
@@ -0,0 +1,161 @@
+/*
+ * Copyright (C) 2006, 2010  Novell, Inc.
+ * Copyright (C) 2015  Red Hat, Inc.
+ * Written by Andreas Gruenbacher <agruenba@redhat.com>
+ *
+ * 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/fs.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/richacl_xattr.h>
+
+/**
+ * richacl_from_xattr  -  convert a richacl xattr into the in-memory representation
+ */
+struct richacl *
+richacl_from_xattr(struct user_namespace *user_ns,
+		   const void *value, size_t size, int invalid_error)
+{
+	const struct richacl_xattr *xattr_acl = value;
+	const struct richace_xattr *xattr_ace = (void *)(xattr_acl + 1);
+	struct richacl *acl;
+	struct richace *ace;
+	int count;
+
+	if (size < sizeof(*xattr_acl) ||
+	    xattr_acl->a_version != RICHACL_XATTR_VERSION ||
+	    (xattr_acl->a_flags & ~RICHACL_VALID_FLAGS))
+		goto invalid;
+	size -= sizeof(*xattr_acl);
+	count = le16_to_cpu(xattr_acl->a_count);
+	if (count > RICHACL_XATTR_MAX_COUNT)
+		goto invalid;
+	if (size != count * sizeof(*xattr_ace))
+		goto invalid;
+
+	acl = richacl_alloc(count, GFP_NOFS);
+	if (!acl)
+		return ERR_PTR(-ENOMEM);
+
+	acl->a_flags = xattr_acl->a_flags;
+	acl->a_owner_mask = le32_to_cpu(xattr_acl->a_owner_mask);
+	if (acl->a_owner_mask & ~RICHACE_VALID_MASK)
+		goto put_invalid;
+	acl->a_group_mask = le32_to_cpu(xattr_acl->a_group_mask);
+	if (acl->a_group_mask & ~RICHACE_VALID_MASK)
+		goto put_invalid;
+	acl->a_other_mask = le32_to_cpu(xattr_acl->a_other_mask);
+	if (acl->a_other_mask & ~RICHACE_VALID_MASK)
+		goto put_invalid;
+
+	richacl_for_each_entry(ace, acl) {
+		ace->e_type  = le16_to_cpu(xattr_ace->e_type);
+		ace->e_flags = le16_to_cpu(xattr_ace->e_flags);
+		ace->e_mask  = le32_to_cpu(xattr_ace->e_mask);
+
+		if (ace->e_flags & ~RICHACE_VALID_FLAGS)
+			goto put_invalid;
+		if (ace->e_flags & RICHACE_SPECIAL_WHO) {
+			ace->e_id.special = le32_to_cpu(xattr_ace->e_id);
+			if (ace->e_id.special > RICHACE_EVERYONE_SPECIAL_ID)
+				goto put_invalid;
+		} else if (ace->e_flags & RICHACE_IDENTIFIER_GROUP) {
+			u32 id = le32_to_cpu(xattr_ace->e_id);
+
+			ace->e_id.gid = make_kgid(user_ns, id);
+			if (!gid_valid(ace->e_id.gid))
+				goto put_invalid;
+		} else {
+			u32 id = le32_to_cpu(xattr_ace->e_id);
+
+			ace->e_id.uid = make_kuid(user_ns, id);
+			if (!uid_valid(ace->e_id.uid))
+				goto put_invalid;
+		}
+		if (ace->e_type > RICHACE_ACCESS_DENIED_ACE_TYPE ||
+		    (ace->e_mask & ~RICHACE_VALID_MASK))
+			goto put_invalid;
+
+		xattr_ace++;
+	}
+
+	return acl;
+
+put_invalid:
+	richacl_put(acl);
+invalid:
+	return ERR_PTR(invalid_error);
+}
+EXPORT_SYMBOL_GPL(richacl_from_xattr);
+
+/**
+ * richacl_xattr_size  -  compute the size of the xattr representation of @acl
+ */
+size_t
+richacl_xattr_size(const struct richacl *acl)
+{
+	size_t size = sizeof(struct richacl_xattr);
+
+	size += sizeof(struct richace_xattr) * acl->a_count;
+	return size;
+}
+EXPORT_SYMBOL_GPL(richacl_xattr_size);
+
+/**
+ * richacl_to_xattr  -  convert @acl into its xattr representation
+ * @acl:	the richacl to convert
+ * @buffer:	buffer for the result
+ * @size:	size of @buffer
+ */
+int
+richacl_to_xattr(struct user_namespace *user_ns,
+		 const struct richacl *acl, void *buffer, size_t size)
+{
+	struct richacl_xattr *xattr_acl = buffer;
+	struct richace_xattr *xattr_ace;
+	const struct richace *ace;
+	size_t real_size;
+
+	real_size = richacl_xattr_size(acl);
+	if (!buffer)
+		return real_size;
+	if (real_size > size)
+		return -ERANGE;
+
+	xattr_acl->a_version = RICHACL_XATTR_VERSION;
+	xattr_acl->a_flags = acl->a_flags;
+	xattr_acl->a_count = cpu_to_le16(acl->a_count);
+
+	xattr_acl->a_owner_mask = cpu_to_le32(acl->a_owner_mask);
+	xattr_acl->a_group_mask = cpu_to_le32(acl->a_group_mask);
+	xattr_acl->a_other_mask = cpu_to_le32(acl->a_other_mask);
+
+	xattr_ace = (void *)(xattr_acl + 1);
+	richacl_for_each_entry(ace, acl) {
+		xattr_ace->e_type = cpu_to_le16(ace->e_type);
+		xattr_ace->e_flags = cpu_to_le16(ace->e_flags);
+		xattr_ace->e_mask = cpu_to_le32(ace->e_mask);
+		if (ace->e_flags & RICHACE_SPECIAL_WHO)
+			xattr_ace->e_id = cpu_to_le32(ace->e_id.special);
+		else if (ace->e_flags & RICHACE_IDENTIFIER_GROUP)
+			xattr_ace->e_id =
+				cpu_to_le32(from_kgid(user_ns, ace->e_id.gid));
+		else
+			xattr_ace->e_id =
+				cpu_to_le32(from_kuid(user_ns, ace->e_id.uid));
+		xattr_ace++;
+	}
+	return real_size;
+}
+EXPORT_SYMBOL_GPL(richacl_to_xattr);
diff --git a/include/linux/richacl_xattr.h b/include/linux/richacl_xattr.h
new file mode 100644
index 0000000..0efa14b
--- /dev/null
+++ b/include/linux/richacl_xattr.h
@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2006, 2010  Novell, Inc.
+ * Copyright (C) 2015  Red Hat, Inc.
+ * Written by Andreas Gruenbacher <agruenba@redhat.com>
+ *
+ * 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_XATTR_H
+#define __RICHACL_XATTR_H
+
+#include <uapi/linux/richacl_xattr.h>
+#include <linux/richacl.h>
+
+extern struct richacl *richacl_from_xattr(struct user_namespace *, const void *,
+					  size_t, int);
+extern size_t richacl_xattr_size(const struct richacl *);
+extern int richacl_to_xattr(struct user_namespace *, const struct richacl *,
+			    void *, size_t);
+
+#endif /* __RICHACL_XATTR_H */
diff --git a/include/uapi/linux/Kbuild b/include/uapi/linux/Kbuild
index ae5bac3a..134d9e1 100644
--- a/include/uapi/linux/Kbuild
+++ b/include/uapi/linux/Kbuild
@@ -354,6 +354,7 @@ header-y += reiserfs_fs.h
 header-y += reiserfs_xattr.h
 header-y += resource.h
 header-y += richacl.h
+header-y += richacl_xattr.h
 header-y += rfkill.h
 header-y += rio_mport_cdev.h
 header-y += romfs_fs.h
diff --git a/include/uapi/linux/richacl_xattr.h b/include/uapi/linux/richacl_xattr.h
new file mode 100644
index 0000000..20da204
--- /dev/null
+++ b/include/uapi/linux/richacl_xattr.h
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2006, 2010  Novell, Inc.
+ * Copyright (C) 2015  Red Hat, Inc.
+ * Written by Andreas Gruenbacher <agruenba@redhat.com>
+ *
+ * This file is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This file 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
+ * Lesser General Public License for more details.
+ */
+
+#ifndef __UAPI_RICHACL_XATTR_H
+#define __UAPI_RICHACL_XATTR_H
+
+#include <linux/types.h>
+#include <linux/limits.h>
+
+struct richace_xattr {
+	__le16	e_type;
+	__le16	e_flags;
+	__le32	e_mask;
+	__le32	e_id;
+};
+
+struct richacl_xattr {
+	__u8	a_version;
+	__u8	a_flags;
+	__le16	a_count;
+	__le32	a_owner_mask;
+	__le32	a_group_mask;
+	__le32	a_other_mask;
+};
+
+#define RICHACL_XATTR_VERSION 0
+#define RICHACL_XATTR_MAX_COUNT \
+	((XATTR_SIZE_MAX - sizeof(struct richacl_xattr)) / \
+	 sizeof(struct richace_xattr))
+
+#endif  /* __UAPI_RICHACL_XATTR_H */
diff --git a/include/uapi/linux/xattr.h b/include/uapi/linux/xattr.h
index 1590c49..1996903 100644
--- a/include/uapi/linux/xattr.h
+++ b/include/uapi/linux/xattr.h
@@ -73,5 +73,7 @@
 #define XATTR_POSIX_ACL_DEFAULT  "posix_acl_default"
 #define XATTR_NAME_POSIX_ACL_DEFAULT XATTR_SYSTEM_PREFIX XATTR_POSIX_ACL_DEFAULT
 
+#define XATTR_RICHACL "richacl"
+#define XATTR_NAME_RICHACL XATTR_SYSTEM_PREFIX XATTR_RICHACL
 
 #endif /* _UAPI_LINUX_XATTR_H */
-- 
2.5.5

  parent reply	other threads:[~2016-05-09 22:05 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-05-09 22:02 [PATCH v21 00/22] Richacls Andreas Gruenbacher
2016-05-09 22:02 ` [PATCH v21 01/22] vfs: Add IS_ACL() and IS_RICHACL() tests Andreas Gruenbacher
2016-05-09 22:02 ` [PATCH v21 02/22] vfs: Add MAY_CREATE_FILE and MAY_CREATE_DIR permission flags Andreas Gruenbacher
2016-05-09 22:02 ` [PATCH v21 03/22] vfs: Add MAY_DELETE_SELF and MAY_DELETE_CHILD " Andreas Gruenbacher
2016-05-09 22:02 ` [PATCH v21 04/22] vfs: Make the inode passed to inode_change_ok non-const Andreas Gruenbacher
2016-05-09 22:02 ` [PATCH v21 05/22] vfs: Add permission flags for setting file attributes Andreas Gruenbacher
2016-05-09 22:02 ` [PATCH v21 06/22] richacl: In-memory representation and helper functions Andreas Gruenbacher
2016-05-09 22:02 ` [PATCH v21 07/22] richacl: Permission mapping functions Andreas Gruenbacher
2016-05-09 22:02 ` [PATCH v21 08/22] richacl: Compute maximum file masks from an acl Andreas Gruenbacher
2016-05-09 22:02 ` [PATCH v21 09/22] richacl: Permission check algorithm Andreas Gruenbacher
2016-05-09 22:02 ` [PATCH v21 10/22] posix_acl: Improve xattr fixup code Andreas Gruenbacher
2016-05-09 22:02 ` [PATCH v21 11/22] vfs: Cache base_acl objects in inodes Andreas Gruenbacher
2016-05-09 22:02 ` [PATCH v21 12/22] vfs: Add get_richacl and set_richacl inode operations Andreas Gruenbacher
2016-05-09 22:02 ` [PATCH v21 13/22] vfs: Cache richacl in struct inode Andreas Gruenbacher
2016-05-09 22:02 ` [PATCH v21 14/22] richacl: Update the file masks in chmod() Andreas Gruenbacher
2016-05-09 22:02 ` [PATCH v21 15/22] richacl: Check if an acl is equivalent to a file mode Andreas Gruenbacher
2016-05-09 22:02 ` [PATCH v21 16/22] richacl: Create-time inheritance Andreas Gruenbacher
2016-05-09 22:02 ` [PATCH v21 17/22] richacl: Automatic Inheritance Andreas Gruenbacher
2016-05-09 22:02 ` Andreas Gruenbacher [this message]
2016-05-09 22:02 ` [PATCH v21 19/22] richacl: Add richacl xattr handler Andreas Gruenbacher
2016-05-09 22:02 ` [PATCH v21 20/22] vfs: Add richacl permission checking Andreas Gruenbacher
2016-05-09 22:02 ` [PATCH v21 21/22] ext4: Add richacl support Andreas Gruenbacher
2016-05-09 22:02 ` [PATCH v21 22/22] ext4: Add richacl feature flag Andreas Gruenbacher
2016-05-10  4:18 ` [PATCH v21 00/22] Richacls Volker Lendecke
2016-05-10  8:11   ` Jeremy Allison
2016-05-10  8:20     ` Volker Lendecke
2016-05-10 15:55     ` Frank Filz

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