linux/fs/ext3/xattr_security.c
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   1/*
   2 * linux/fs/ext3/xattr_security.c
   3 * Handler for storing security labels as extended attributes.
   4 */
   5
   6#include <linux/security.h>
   7#include "ext3.h"
   8#include "xattr.h"
   9
  10static size_t
  11ext3_xattr_security_list(struct dentry *dentry, char *list, size_t list_size,
  12                         const char *name, size_t name_len, int type)
  13{
  14        const size_t prefix_len = XATTR_SECURITY_PREFIX_LEN;
  15        const size_t total_len = prefix_len + name_len + 1;
  16
  17
  18        if (list && total_len <= list_size) {
  19                memcpy(list, XATTR_SECURITY_PREFIX, prefix_len);
  20                memcpy(list+prefix_len, name, name_len);
  21                list[prefix_len + name_len] = '\0';
  22        }
  23        return total_len;
  24}
  25
  26static int
  27ext3_xattr_security_get(struct dentry *dentry, const char *name,
  28                void *buffer, size_t size, int type)
  29{
  30        if (strcmp(name, "") == 0)
  31                return -EINVAL;
  32        return ext3_xattr_get(dentry->d_inode, EXT3_XATTR_INDEX_SECURITY,
  33                              name, buffer, size);
  34}
  35
  36static int
  37ext3_xattr_security_set(struct dentry *dentry, const char *name,
  38                const void *value, size_t size, int flags, int type)
  39{
  40        if (strcmp(name, "") == 0)
  41                return -EINVAL;
  42        return ext3_xattr_set(dentry->d_inode, EXT3_XATTR_INDEX_SECURITY,
  43                              name, value, size, flags);
  44}
  45
  46int ext3_initxattrs(struct inode *inode, const struct xattr *xattr_array,
  47                    void *fs_info)
  48{
  49        const struct xattr *xattr;
  50        handle_t *handle = fs_info;
  51        int err = 0;
  52
  53        for (xattr = xattr_array; xattr->name != NULL; xattr++) {
  54                err = ext3_xattr_set_handle(handle, inode,
  55                                            EXT3_XATTR_INDEX_SECURITY,
  56                                            xattr->name, xattr->value,
  57                                            xattr->value_len, 0);
  58                if (err < 0)
  59                        break;
  60        }
  61        return err;
  62}
  63
  64int
  65ext3_init_security(handle_t *handle, struct inode *inode, struct inode *dir,
  66                   const struct qstr *qstr)
  67{
  68        return security_inode_init_security(inode, dir, qstr,
  69                                            &ext3_initxattrs, handle);
  70}
  71
  72const struct xattr_handler ext3_xattr_security_handler = {
  73        .prefix = XATTR_SECURITY_PREFIX,
  74        .list   = ext3_xattr_security_list,
  75        .get    = ext3_xattr_security_get,
  76        .set    = ext3_xattr_security_set,
  77};
  78
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