fs/hfsplus/xattr_security.c

   1 /*
   2  * linux/fs/hfsplus/xattr_trusted.c
   3  *
   4  * Vyacheslav Dubeyko <slava@dubeyko.com>
   5  *
   6  * Handler for storing security labels as extended attributes.
   7  */
   8
   9 #include <linux/security.h>
  10 #include <linux/nls.h>
  11
  12 #include "hfsplus_fs.h"
  13 #include "xattr.h"
  14 #include "acl.h"
  15
  16 static int hfsplus_security_getxattr(struct dentry *dentry, const char *name,
  17                                         void *buffer, size_t size, int type)
  18 {
  19         return hfsplus_getxattr(dentry, name, buffer, size,
  20                                 XATTR_SECURITY_PREFIX,
  21                                 XATTR_SECURITY_PREFIX_LEN);
  22 }
  23
  24 static int hfsplus_security_setxattr(struct dentry *dentry, const char *name,
  25                 const void *buffer, size_t size, int flags, int type)
  26 {
  27         return hfsplus_setxattr(dentry, name, buffer, size, flags,
  28                                 XATTR_SECURITY_PREFIX,
  29                                 XATTR_SECURITY_PREFIX_LEN);
  30 }
  31
  32 static size_t hfsplus_security_listxattr(struct dentry *dentry, char *list,
  33                 size_t list_size, const char *name, size_t name_len, int type)
  34 {
  35         /*
  36          * This method is not used.
  37          * It is used hfsplus_listxattr() instead of generic_listxattr().
  38          */
  39         return -EOPNOTSUPP;
  40 }
  41
  42 static int hfsplus_initxattrs(struct inode *inode,
  43                                 const struct xattr *xattr_array,
  44                                 void *fs_info)
  45 {
  46         const struct xattr *xattr;
  47         char *xattr_name;
  48         int err = 0;
  49
  50         xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1,
  51                 GFP_KERNEL);
  52         if (!xattr_name)
  53                 return -ENOMEM;
  54         for (xattr = xattr_array; xattr->name != NULL; xattr++) {
  55
  56                 if (!strcmp(xattr->name, ""))
  57                         continue;
  58
  59                 strcpy(xattr_name, XATTR_SECURITY_PREFIX);
  60                 strcpy(xattr_name +
  61                         XATTR_SECURITY_PREFIX_LEN, xattr->name);
  62                 memset(xattr_name +
  63                         XATTR_SECURITY_PREFIX_LEN + strlen(xattr->name), 0, 1);
  64
  65                 err = __hfsplus_setxattr(inode, xattr_name,
  66                                         xattr->value, xattr->value_len, 0);
  67                 if (err)
  68                         break;
  69         }
  70         kfree(xattr_name);
  71         return err;
  72 }
  73
  74 int hfsplus_init_security(struct inode *inode, struct inode *dir,
  75                                 const struct qstr *qstr)
  76 {
  77         return security_inode_init_security(inode, dir, qstr,
  78                                         &hfsplus_initxattrs, NULL);
  79 }
  80
  81 int hfsplus_init_inode_security(struct inode *inode,
  82                                                 struct inode *dir,
  83                                                 const struct qstr *qstr)
  84 {
  85         int err;
  86
  87         err = hfsplus_init_posix_acl(inode, dir);
  88         if (!err)
  89                 err = hfsplus_init_security(inode, dir, qstr);
  90         return err;
  91 }
  92
  93 const struct xattr_handler hfsplus_xattr_security_handler = {
  94         .prefix = XATTR_SECURITY_PREFIX,
  95         .list   = hfsplus_security_listxattr,
  96         .get    = hfsplus_security_getxattr,
  97         .set    = hfsplus_security_setxattr,
  98 };