// SPDX-License-Identifier: GPL-2.0
/*
 * linux/fs/hfsplus/xattr_trusted.c
 *
 * Vyacheslav Dubeyko <slava@dubeyko.com>
 *
 * Handler for storing security labels as extended attributes.
 */

#include <linux/security.h>
#include <linux/nls.h>

#include "hfsplus_fs.h"
#include "xattr.h"

static int hfsplus_security_getxattr(const struct xattr_handler *handler,
                                     struct dentry *unused, struct inode *inode,
                                     const char *name, void *buffer, size_t size)
{
        return hfsplus_getxattr(inode, name, buffer, size,
                                XATTR_SECURITY_PREFIX,
                                XATTR_SECURITY_PREFIX_LEN);
}

static int hfsplus_security_setxattr(const struct xattr_handler *handler,
                                     struct mnt_idmap *idmap,
                                     struct dentry *unused, struct inode *inode,
                                     const char *name, const void *buffer,
                                     size_t size, int flags)
{
        return hfsplus_setxattr(inode, name, buffer, size, flags,
                                XATTR_SECURITY_PREFIX,
                                XATTR_SECURITY_PREFIX_LEN);
}

static int hfsplus_initxattrs(struct inode *inode,
                                const struct xattr *xattr_array,
                                void *fs_info)
{
        const struct xattr *xattr;
        char *xattr_name;
        int err = 0;

        xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1,
                GFP_KERNEL);
        if (!xattr_name)
                return -ENOMEM;
        for (xattr = xattr_array; xattr->name != NULL; xattr++) {

                if (!strcmp(xattr->name, ""))
                        continue;

                strcpy(xattr_name, XATTR_SECURITY_PREFIX);
                strcpy(xattr_name +
                        XATTR_SECURITY_PREFIX_LEN, xattr->name);
                memset(xattr_name +
                        XATTR_SECURITY_PREFIX_LEN + strlen(xattr->name), 0, 1);

                err = __hfsplus_setxattr(inode, xattr_name,
                                        xattr->value, xattr->value_len, 0);
                if (err)
                        break;
        }
        kfree(xattr_name);
        return err;
}

int hfsplus_init_security(struct inode *inode, struct inode *dir,
                                const struct qstr *qstr)
{
        return security_inode_init_security(inode, dir, qstr,
                                        &hfsplus_initxattrs, NULL);
}

const struct xattr_handler hfsplus_xattr_security_handler = {
        .prefix = XATTR_SECURITY_PREFIX,
        .get    = hfsplus_security_getxattr,
        .set    = hfsplus_security_setxattr,
};