kernel/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(const struct xattr_handler *handler,
  17                                      struct dentry *dentry, const char *name,
  18                                      void *buffer, size_t size)
  19 {
  20         return hfsplus_getxattr(dentry, name, buffer, size,
  21                                 XATTR_SECURITY_PREFIX,
  22                                 XATTR_SECURITY_PREFIX_LEN);
  23 }
  24
  25 static int hfsplus_security_setxattr(const struct xattr_handler *handler,
  26                                      struct dentry *dentry, const char *name,
  27                                      const void *buffer, size_t size, int flags)
  28 {
  29         return hfsplus_setxattr(dentry, name, buffer, size, flags,
  30                                 XATTR_SECURITY_PREFIX,
  31                                 XATTR_SECURITY_PREFIX_LEN);
  32 }
  33
  34 static int hfsplus_initxattrs(struct inode *inode,
  35                                 const struct xattr *xattr_array,
  36                                 void *fs_info)
  37 {
  38         const struct xattr *xattr;
  39         char *xattr_name;
  40         int err = 0;
  41
  42         xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1,
  43                 GFP_KERNEL);
  44         if (!xattr_name)
  45                 return -ENOMEM;
  46         for (xattr = xattr_array; xattr->name != NULL; xattr++) {
  47
  48                 if (!strcmp(xattr->name, ""))
  49                         continue;
  50
  51                 strcpy(xattr_name, XATTR_SECURITY_PREFIX);
  52                 strcpy(xattr_name +
  53                         XATTR_SECURITY_PREFIX_LEN, xattr->name);
  54                 memset(xattr_name +
  55                         XATTR_SECURITY_PREFIX_LEN + strlen(xattr->name), 0, 1);
  56
  57                 err = __hfsplus_setxattr(inode, xattr_name,
  58                                         xattr->value, xattr->value_len, 0);
  59                 if (err)
  60                         break;
  61         }
  62         kfree(xattr_name);
  63         return err;
  64 }
  65
  66 int hfsplus_init_security(struct inode *inode, struct inode *dir,
  67                                 const struct qstr *qstr)
  68 {
  69         return security_inode_init_security(inode, dir, qstr,
  70                                         &hfsplus_initxattrs, NULL);
  71 }
  72
  73 int hfsplus_init_inode_security(struct inode *inode,
  74                                                 struct inode *dir,
  75                                                 const struct qstr *qstr)
  76 {
  77         int err;
  78
  79         err = hfsplus_init_posix_acl(inode, dir);
  80         if (!err)
  81                 err = hfsplus_init_security(inode, dir, qstr);
  82         return err;
  83 }
  84
  85 const struct xattr_handler hfsplus_xattr_security_handler = {
  86         .prefix = XATTR_SECURITY_PREFIX,
  87         .get    = hfsplus_security_getxattr,
  88         .set    = hfsplus_security_setxattr,
  89 };