linux/fs/hfsplus/xattr_security.c
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   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * linux/fs/hfsplus/xattr_trusted.c
   4 *
   5 * Vyacheslav Dubeyko <slava@dubeyko.com>
   6 *
   7 * Handler for storing security labels as extended attributes.
   8 */
   9
  10#include <linux/security.h>
  11#include <linux/nls.h>
  12
  13#include "hfsplus_fs.h"
  14#include "xattr.h"
  15
  16static int hfsplus_security_getxattr(const struct xattr_handler *handler,
  17                                     struct dentry *unused, struct inode *inode,
  18                                     const char *name, void *buffer, size_t size)
  19{
  20        return hfsplus_getxattr(inode, name, buffer, size,
  21                                XATTR_SECURITY_PREFIX,
  22                                XATTR_SECURITY_PREFIX_LEN);
  23}
  24
  25static int hfsplus_security_setxattr(const struct xattr_handler *handler,
  26                                     struct user_namespace *mnt_userns,
  27                                     struct dentry *unused, struct inode *inode,
  28                                     const char *name, const void *buffer,
  29                                     size_t size, int flags)
  30{
  31        return hfsplus_setxattr(inode, name, buffer, size, flags,
  32                                XATTR_SECURITY_PREFIX,
  33                                XATTR_SECURITY_PREFIX_LEN);
  34}
  35
  36static int hfsplus_initxattrs(struct inode *inode,
  37                                const struct xattr *xattr_array,
  38                                void *fs_info)
  39{
  40        const struct xattr *xattr;
  41        char *xattr_name;
  42        int err = 0;
  43
  44        xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1,
  45                GFP_KERNEL);
  46        if (!xattr_name)
  47                return -ENOMEM;
  48        for (xattr = xattr_array; xattr->name != NULL; xattr++) {
  49
  50                if (!strcmp(xattr->name, ""))
  51                        continue;
  52
  53                strcpy(xattr_name, XATTR_SECURITY_PREFIX);
  54                strcpy(xattr_name +
  55                        XATTR_SECURITY_PREFIX_LEN, xattr->name);
  56                memset(xattr_name +
  57                        XATTR_SECURITY_PREFIX_LEN + strlen(xattr->name), 0, 1);
  58
  59                err = __hfsplus_setxattr(inode, xattr_name,
  60                                        xattr->value, xattr->value_len, 0);
  61                if (err)
  62                        break;
  63        }
  64        kfree(xattr_name);
  65        return err;
  66}
  67
  68int hfsplus_init_security(struct inode *inode, struct inode *dir,
  69                                const struct qstr *qstr)
  70{
  71        return security_inode_init_security(inode, dir, qstr,
  72                                        &hfsplus_initxattrs, NULL);
  73}
  74
  75const struct xattr_handler hfsplus_xattr_security_handler = {
  76        .prefix = XATTR_SECURITY_PREFIX,
  77        .get    = hfsplus_security_getxattr,
  78        .set    = hfsplus_security_setxattr,
  79};
  80