From: Andreas Gruenbacher <agruenba@redhat.com>
To: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: "J. Bruce Fields" <bfields@fieldses.org>,
linux-nfs@vger.kernel.org, "Theodore Ts'o" <tytso@mit.edu>,
linux-cifs@vger.kernel.org, linux-api@vger.kernel.org,
Trond Myklebust <trond.myklebust@primarydata.com>,
linux-kernel@vger.kernel.org, xfs@oss.sgi.com,
Christoph Hellwig <hch@infradead.org>,
Andreas Dilger <adilger.kernel@dilger.ca>,
linux-fsdevel@vger.kernel.org,
Jeff Layton <jlayton@poochiereds.net>,
linux-ext4@vger.kernel.org,
Anna Schumaker <anna.schumaker@netapp.com>
Subject: [PATCH v18 18/22] richacl: xattr mapping functions
Date: Mon, 29 Feb 2016 09:17:23 +0100 [thread overview]
Message-ID: <1456733847-17982-19-git-send-email-agruenba@redhat.com> (raw)
In-Reply-To: <1456733847-17982-1-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 | 162 +++++++++++++++++++++++++++++++++++++
fs/xattr.c | 29 +++++--
include/linux/richacl_xattr.h | 29 +++++++
include/uapi/linux/Kbuild | 1 +
include/uapi/linux/richacl_xattr.h | 44 ++++++++++
include/uapi/linux/xattr.h | 2 +
7 files changed, 262 insertions(+), 7 deletions(-)
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 d5b45ca..2d6d224 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -49,7 +49,7 @@ obj-$(CONFIG_SYSCTL) += drop_caches.o
obj-$(CONFIG_FHANDLE) += fhandle.o
obj-$(CONFIG_FS_RICHACL) += richacl.o
-richacl-y := richacl_base.o richacl_inode.o
+richacl-y := richacl_base.o richacl_inode.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..a273139
--- /dev/null
+++ b/fs/richacl_xattr.c
@@ -0,0 +1,162 @@
+/*
+ * 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>
+
+MODULE_LICENSE("GPL");
+
+/**
+ * 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)
+{
+ 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))
+ return ERR_PTR(-EINVAL);
+ size -= sizeof(*xattr_acl);
+ count = le16_to_cpu(xattr_acl->a_count);
+ if (count > RICHACL_XATTR_MAX_COUNT)
+ return ERR_PTR(-EINVAL);
+ if (size != count * sizeof(*xattr_ace))
+ return ERR_PTR(-EINVAL);
+
+ 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 fail_einval;
+ acl->a_group_mask = le32_to_cpu(xattr_acl->a_group_mask);
+ if (acl->a_group_mask & ~RICHACE_VALID_MASK)
+ goto fail_einval;
+ acl->a_other_mask = le32_to_cpu(xattr_acl->a_other_mask);
+ if (acl->a_other_mask & ~RICHACE_VALID_MASK)
+ goto fail_einval;
+
+ 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 fail_einval;
+ 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 fail_einval;
+ } 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 fail_einval;
+ } 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 fail_einval;
+ }
+ if (ace->e_type > RICHACE_ACCESS_DENIED_ACE_TYPE ||
+ (ace->e_mask & ~RICHACE_VALID_MASK))
+ goto fail_einval;
+
+ xattr_ace++;
+ }
+
+ return acl;
+
+fail_einval:
+ richacl_put(acl);
+ return ERR_PTR(-EINVAL);
+}
+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/fs/xattr.c b/fs/xattr.c
index 07d0e47..d29e067 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -295,6 +295,16 @@ out:
}
EXPORT_SYMBOL_GPL(vfs_removexattr);
+static void
+fix_xattr_from_user(const char *kname, void *kvalue, size_t size)
+{
+ if (strncmp(kname, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
+ return;
+ kname += XATTR_SYSTEM_PREFIX_LEN;
+ if (!strcmp(kname, XATTR_POSIX_ACL_ACCESS) ||
+ !strcmp(kname, XATTR_POSIX_ACL_DEFAULT))
+ posix_acl_fix_xattr_from_user(kvalue, size);
+}
/*
* Extended attribute SET operations
@@ -329,9 +339,7 @@ setxattr(struct dentry *d, const char __user *name, const void __user *value,
error = -EFAULT;
goto out;
}
- if ((strcmp(kname, XATTR_NAME_POSIX_ACL_ACCESS) == 0) ||
- (strcmp(kname, XATTR_NAME_POSIX_ACL_DEFAULT) == 0))
- posix_acl_fix_xattr_from_user(kvalue, size);
+ fix_xattr_from_user(kname, kvalue, size);
}
error = vfs_setxattr(d, kname, kvalue, size, flags);
@@ -396,6 +404,17 @@ SYSCALL_DEFINE5(fsetxattr, int, fd, const char __user *, name,
return error;
}
+static void
+fix_xattr_to_user(const char *kname, void *kvalue, size_t size)
+{
+ if (strncmp(kname, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
+ return;
+ kname += XATTR_SYSTEM_PREFIX_LEN;
+ if (!strcmp(kname, XATTR_POSIX_ACL_ACCESS) ||
+ !strcmp(kname, XATTR_POSIX_ACL_DEFAULT))
+ posix_acl_fix_xattr_to_user(kvalue, size);
+}
+
/*
* Extended attribute GET operations
*/
@@ -426,9 +445,7 @@ getxattr(struct dentry *d, const char __user *name, void __user *value,
error = vfs_getxattr(d, kname, kvalue, size);
if (error > 0) {
- if ((strcmp(kname, XATTR_NAME_POSIX_ACL_ACCESS) == 0) ||
- (strcmp(kname, XATTR_NAME_POSIX_ACL_DEFAULT) == 0))
- posix_acl_fix_xattr_to_user(kvalue, size);
+ fix_xattr_to_user(kname, kvalue, size);
if (size && copy_to_user(value, kvalue, error))
error = -EFAULT;
} else if (error == -ERANGE && size >= XATTR_SIZE_MAX) {
diff --git a/include/linux/richacl_xattr.h b/include/linux/richacl_xattr.h
new file mode 100644
index 0000000..ab67af2
--- /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);
+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 6e05dc8..14b8a06 100644
--- a/include/uapi/linux/Kbuild
+++ b/include/uapi/linux/Kbuild
@@ -352,6 +352,7 @@ 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 += romfs_fs.h
header-y += rose.h
diff --git a/include/uapi/linux/richacl_xattr.h b/include/uapi/linux/richacl_xattr.h
new file mode 100644
index 0000000..5178ca6
--- /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 {
+ unsigned char a_version;
+ unsigned char 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 */
--
2.4.3
next prev parent reply other threads:[~2016-02-29 8:18 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-29 8:17 [PATCH v18 00/22] Richacls (Core and Ext4) Andreas Gruenbacher
2016-02-29 8:17 ` [PATCH v18 01/22] vfs: Add IS_ACL() and IS_RICHACL() tests Andreas Gruenbacher
2016-02-29 8:17 ` [PATCH v18 02/22] vfs: Add MAY_CREATE_FILE and MAY_CREATE_DIR permission flags Andreas Gruenbacher
2016-02-29 8:17 ` [PATCH v18 03/22] vfs: Add MAY_DELETE_SELF and MAY_DELETE_CHILD " Andreas Gruenbacher
2016-02-29 8:17 ` [PATCH v18 04/22] vfs: Make the inode passed to inode_change_ok non-const Andreas Gruenbacher
2016-02-29 8:17 ` [PATCH v18 05/22] vfs: Add permission flags for setting file attributes Andreas Gruenbacher
2016-02-29 8:17 ` [PATCH v18 06/22] richacl: In-memory representation and helper functions Andreas Gruenbacher
2016-02-29 8:17 ` [PATCH v18 07/22] richacl: Permission mapping functions Andreas Gruenbacher
2016-02-29 8:17 ` [PATCH v18 08/22] richacl: Compute maximum file masks from an acl Andreas Gruenbacher
2016-02-29 8:17 ` [PATCH v18 09/22] richacl: Permission check algorithm Andreas Gruenbacher
2016-03-11 14:09 ` Christoph Hellwig
2016-02-29 8:17 ` [PATCH v18 10/22] posix_acl: Unexport acl_by_type and make it static Andreas Gruenbacher
2016-03-11 14:03 ` Christoph Hellwig
2016-02-29 8:17 ` [PATCH v18 11/22] vfs: Cache base_acl objects in inodes Andreas Gruenbacher
2016-03-11 14:07 ` Christoph Hellwig
2016-03-11 16:24 ` Andreas Gruenbacher
2016-03-15 7:12 ` Christoph Hellwig
2016-03-16 22:31 ` Andreas Gruenbacher
2016-02-29 8:17 ` [PATCH v18 12/22] vfs: Add get_richacl and set_richacl inode operations Andreas Gruenbacher
2016-02-29 8:17 ` [PATCH v18 13/22] vfs: Cache richacl in struct inode Andreas Gruenbacher
2016-02-29 8:17 ` [PATCH v18 14/22] richacl: Update the file masks in chmod() Andreas Gruenbacher
2016-02-29 8:17 ` [PATCH v18 15/22] richacl: Check if an acl is equivalent to a file mode Andreas Gruenbacher
2016-02-29 8:17 ` [PATCH v18 16/22] richacl: Create-time inheritance Andreas Gruenbacher
2016-02-29 8:17 ` [PATCH v18 17/22] richacl: Automatic Inheritance Andreas Gruenbacher
2016-02-29 8:17 ` Andreas Gruenbacher [this message]
2016-03-11 14:17 ` [PATCH v18 18/22] richacl: xattr mapping functions Christoph Hellwig
2016-03-11 17:03 ` Andreas Gruenbacher
2016-02-29 8:17 ` [PATCH v18 19/22] richacl: Add richacl xattr handler Andreas Gruenbacher
2016-03-11 14:17 ` Christoph Hellwig
2016-03-11 14:19 ` J. Bruce Fields
2016-03-15 7:10 ` Christoph Hellwig
2016-03-15 21:05 ` J. Bruce Fields
2016-03-21 16:09 ` Christoph Hellwig
2016-02-29 8:17 ` [PATCH v18 20/22] vfs: Add richacl permission checking Andreas Gruenbacher
2016-02-29 8:17 ` [PATCH v18 21/22] ext4: Add richacl support Andreas Gruenbacher
2016-03-11 14:27 ` Christoph Hellwig
2016-03-13 23:08 ` Andreas Gruenbacher
2016-03-15 7:17 ` Christoph Hellwig
2016-03-16 22:38 ` Andreas Gruenbacher
2016-03-13 23:49 ` Andreas Gruenbacher
2016-03-14 13:02 ` Andreas Gruenbacher
2016-03-15 7:18 ` Christoph Hellwig
2016-02-29 8:17 ` [PATCH v18 22/22] ext4: Add richacl feature flag Andreas Gruenbacher
2016-03-11 14:01 ` [PATCH v18 00/22] Richacls (Core and Ext4) Christoph Hellwig
2016-03-11 14:07 ` J. Bruce Fields
2016-03-12 21:12 ` Simo
2016-03-15 7:09 ` Christoph Hellwig
2016-03-11 16:11 ` Andreas Gruenbacher
2016-03-11 20:05 ` Steve French
2016-03-11 23:02 ` Jeremy Allison
2016-03-13 23:02 ` Andreas Gruenbacher
2016-03-14 3:54 ` Jeremy Allison
2016-03-15 7:14 ` Christoph Hellwig
2016-03-16 3:40 ` Steve French
2016-03-15 7:11 ` Christoph Hellwig
2016-03-15 15:45 ` Jeremy Allison
2016-03-15 20:17 ` Volker Lendecke
2016-03-16 3:28 ` Steve French
2016-03-21 18:20 ` Michael Adam
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