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 int hfsplus_initxattrs(struct inode *inode,
  33                                 const struct xattr *xattr_array,
  34                                 void *fs_info)
  35 {
  36         const struct xattr *xattr;
  37         char *xattr_name;
  38         int err = 0;
  39
  40         xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1,
  41                 GFP_KERNEL);
  42         if (!xattr_name)
  43                 return -ENOMEM;
  44         for (xattr = xattr_array; xattr->name != NULL; xattr++) {
  45
  46                 if (!strcmp(xattr->name, ""))
  47                         continue;
  48
  49                 strcpy(xattr_name, XATTR_SECURITY_PREFIX);
  50                 strcpy(xattr_name +
  51                         XATTR_SECURITY_PREFIX_LEN, xattr->name);
  52                 memset(xattr_name +
  53                         XATTR_SECURITY_PREFIX_LEN + strlen(xattr->name), 0, 1);
  54
  55                 err = __hfsplus_setxattr(inode, xattr_name,
  56                                         xattr->value, xattr->value_len, 0);
  57                 if (err)
  58                         break;
  59         }
  60         kfree(xattr_name);
  61         return err;
  62 }
  63
  64 int hfsplus_init_security(struct inode *inode, struct inode *dir,
  65                                 const struct qstr *qstr)
  66 {
  67         return security_inode_init_security(inode, dir, qstr,
  68                                         &hfsplus_initxattrs, NULL);
  69 }
  70
  71 int hfsplus_init_inode_security(struct inode *inode,
  72                                                 struct inode *dir,
  73                                                 const struct qstr *qstr)
  74 {
  75         int err;
  76
  77         err = hfsplus_init_posix_acl(inode, dir);
  78         if (!err)
  79                 err = hfsplus_init_security(inode, dir, qstr);
  80         return err;
  81 }
  82
  83 const struct xattr_handler hfsplus_xattr_security_handler = {
  84         .prefix = XATTR_SECURITY_PREFIX,
  85         .get    = hfsplus_security_getxattr,
  86         .set    = hfsplus_security_setxattr,
  87 };