2005-04-17 00:20:36 +02:00
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/*
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* Implementation of the extensible bitmap type.
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*
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* Author : Stephen Smalley, <sds@epoch.ncsc.mil>
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*/
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2006-08-05 08:17:57 +02:00
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/*
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* Updated: Hewlett-Packard <paul.moore@hp.com>
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*
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2006-11-29 19:18:18 +01:00
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* Added support to import/export the NetLabel category bitmap
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2006-08-05 08:17:57 +02:00
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*
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* (c) Copyright Hewlett-Packard Development Company, L.P., 2006
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*/
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2005-04-17 00:20:36 +02:00
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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2006-11-29 19:18:18 +01:00
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#include <net/netlabel.h>
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2005-04-17 00:20:36 +02:00
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#include "ebitmap.h"
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#include "policydb.h"
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int ebitmap_cmp(struct ebitmap *e1, struct ebitmap *e2)
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{
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struct ebitmap_node *n1, *n2;
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if (e1->highbit != e2->highbit)
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return 0;
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n1 = e1->node;
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n2 = e2->node;
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while (n1 && n2 &&
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(n1->startbit == n2->startbit) &&
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(n1->map == n2->map)) {
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n1 = n1->next;
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n2 = n2->next;
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}
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if (n1 || n2)
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return 0;
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return 1;
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}
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int ebitmap_cpy(struct ebitmap *dst, struct ebitmap *src)
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{
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struct ebitmap_node *n, *new, *prev;
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ebitmap_init(dst);
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n = src->node;
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prev = NULL;
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while (n) {
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2005-10-30 23:59:21 +01:00
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new = kzalloc(sizeof(*new), GFP_ATOMIC);
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2005-04-17 00:20:36 +02:00
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if (!new) {
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ebitmap_destroy(dst);
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return -ENOMEM;
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}
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new->startbit = n->startbit;
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new->map = n->map;
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new->next = NULL;
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if (prev)
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prev->next = new;
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else
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dst->node = new;
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prev = new;
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n = n->next;
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}
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dst->highbit = src->highbit;
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return 0;
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}
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2006-11-29 19:18:18 +01:00
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#ifdef CONFIG_NETLABEL
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2006-08-05 08:17:57 +02:00
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/**
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2006-11-29 19:18:18 +01:00
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* ebitmap_netlbl_export - Export an ebitmap into a NetLabel category bitmap
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* @ebmap: the ebitmap to export
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* @catmap: the NetLabel category bitmap
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2006-08-05 08:17:57 +02:00
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*
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* Description:
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2006-11-29 19:18:18 +01:00
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* Export a SELinux extensibile bitmap into a NetLabel category bitmap.
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* Returns zero on success, negative values on error.
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2006-08-05 08:17:57 +02:00
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*
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*/
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2006-11-29 19:18:18 +01:00
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int ebitmap_netlbl_export(struct ebitmap *ebmap,
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struct netlbl_lsm_secattr_catmap **catmap)
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2006-08-05 08:17:57 +02:00
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{
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2006-11-29 19:18:18 +01:00
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struct ebitmap_node *e_iter = ebmap->node;
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struct netlbl_lsm_secattr_catmap *c_iter;
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u32 cmap_idx;
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/* This function is a much simpler because SELinux's MAPTYPE happens
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* to be the same as NetLabel's NETLBL_CATMAP_MAPTYPE, if MAPTYPE is
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* changed from a u64 this function will most likely need to be changed
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* as well. It's not ideal but I think the tradeoff in terms of
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* neatness and speed is worth it. */
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if (e_iter == NULL) {
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*catmap = NULL;
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2006-10-12 01:10:48 +02:00
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return 0;
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}
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2006-11-29 19:18:18 +01:00
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c_iter = netlbl_secattr_catmap_alloc(GFP_ATOMIC);
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if (c_iter == NULL)
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2006-08-05 08:17:57 +02:00
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return -ENOMEM;
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2006-11-29 19:18:18 +01:00
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*catmap = c_iter;
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c_iter->startbit = e_iter->startbit & ~(NETLBL_CATMAP_SIZE - 1);
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while (e_iter != NULL) {
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if (e_iter->startbit >=
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(c_iter->startbit + NETLBL_CATMAP_SIZE)) {
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c_iter->next = netlbl_secattr_catmap_alloc(GFP_ATOMIC);
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if (c_iter->next == NULL)
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goto netlbl_export_failure;
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c_iter = c_iter->next;
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c_iter->startbit = e_iter->startbit &
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~(NETLBL_CATMAP_SIZE - 1);
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}
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cmap_idx = (e_iter->startbit - c_iter->startbit) /
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NETLBL_CATMAP_MAPSIZE;
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c_iter->bitmap[cmap_idx] = e_iter->map;
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e_iter = e_iter->next;
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}
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2006-08-05 08:17:57 +02:00
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return 0;
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2006-11-29 19:18:18 +01:00
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netlbl_export_failure:
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netlbl_secattr_catmap_free(*catmap);
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return -ENOMEM;
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2006-08-05 08:17:57 +02:00
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}
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/**
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2006-11-29 19:18:18 +01:00
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* ebitmap_netlbl_import - Import a NetLabel category bitmap into an ebitmap
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* @ebmap: the ebitmap to export
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* @catmap: the NetLabel category bitmap
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2006-08-05 08:17:57 +02:00
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*
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* Description:
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2006-11-29 19:18:18 +01:00
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* Import a NetLabel category bitmap into a SELinux extensibile bitmap.
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* Returns zero on success, negative values on error.
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2006-08-05 08:17:57 +02:00
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*
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*/
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2006-11-29 19:18:18 +01:00
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int ebitmap_netlbl_import(struct ebitmap *ebmap,
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struct netlbl_lsm_secattr_catmap *catmap)
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2006-08-05 08:17:57 +02:00
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{
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2006-11-29 19:18:18 +01:00
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struct ebitmap_node *e_iter = NULL;
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struct ebitmap_node *emap_prev = NULL;
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struct netlbl_lsm_secattr_catmap *c_iter = catmap;
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u32 c_idx;
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2006-08-05 08:17:57 +02:00
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2006-11-29 19:18:18 +01:00
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/* This function is a much simpler because SELinux's MAPTYPE happens
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* to be the same as NetLabel's NETLBL_CATMAP_MAPTYPE, if MAPTYPE is
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* changed from a u64 this function will most likely need to be changed
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|
* as well. It's not ideal but I think the tradeoff in terms of
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|
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* neatness and speed is worth it. */
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2006-08-05 08:17:57 +02:00
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2006-11-29 19:18:18 +01:00
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do {
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for (c_idx = 0; c_idx < NETLBL_CATMAP_MAPCNT; c_idx++) {
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if (c_iter->bitmap[c_idx] == 0)
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continue;
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2006-08-05 08:17:57 +02:00
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2006-11-29 19:18:18 +01:00
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e_iter = kzalloc(sizeof(*e_iter), GFP_ATOMIC);
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if (e_iter == NULL)
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goto netlbl_import_failure;
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if (emap_prev == NULL)
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ebmap->node = e_iter;
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else
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emap_prev->next = e_iter;
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emap_prev = e_iter;
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e_iter->startbit = c_iter->startbit +
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NETLBL_CATMAP_MAPSIZE * c_idx;
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e_iter->map = c_iter->bitmap[c_idx];
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}
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c_iter = c_iter->next;
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} while (c_iter != NULL);
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if (e_iter != NULL)
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ebmap->highbit = e_iter->startbit + MAPSIZE;
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2006-08-05 08:17:57 +02:00
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else
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2006-11-29 19:18:18 +01:00
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ebitmap_destroy(ebmap);
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2006-08-05 08:17:57 +02:00
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return 0;
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2006-11-29 19:18:18 +01:00
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netlbl_import_failure:
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ebitmap_destroy(ebmap);
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return -ENOMEM;
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2006-08-05 08:17:57 +02:00
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}
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2006-11-29 19:18:18 +01:00
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#endif /* CONFIG_NETLABEL */
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2006-08-05 08:17:57 +02:00
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2005-04-17 00:20:36 +02:00
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int ebitmap_contains(struct ebitmap *e1, struct ebitmap *e2)
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{
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struct ebitmap_node *n1, *n2;
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if (e1->highbit < e2->highbit)
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return 0;
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n1 = e1->node;
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n2 = e2->node;
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while (n1 && n2 && (n1->startbit <= n2->startbit)) {
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if (n1->startbit < n2->startbit) {
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n1 = n1->next;
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continue;
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}
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if ((n1->map & n2->map) != n2->map)
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return 0;
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n1 = n1->next;
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n2 = n2->next;
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}
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if (n2)
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return 0;
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return 1;
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}
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int ebitmap_get_bit(struct ebitmap *e, unsigned long bit)
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{
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struct ebitmap_node *n;
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if (e->highbit < bit)
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return 0;
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n = e->node;
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while (n && (n->startbit <= bit)) {
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if ((n->startbit + MAPSIZE) > bit) {
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if (n->map & (MAPBIT << (bit - n->startbit)))
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return 1;
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else
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return 0;
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}
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n = n->next;
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}
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return 0;
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}
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int ebitmap_set_bit(struct ebitmap *e, unsigned long bit, int value)
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{
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struct ebitmap_node *n, *prev, *new;
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prev = NULL;
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n = e->node;
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while (n && n->startbit <= bit) {
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if ((n->startbit + MAPSIZE) > bit) {
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if (value) {
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n->map |= (MAPBIT << (bit - n->startbit));
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} else {
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n->map &= ~(MAPBIT << (bit - n->startbit));
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if (!n->map) {
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/* drop this node from the bitmap */
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if (!n->next) {
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/*
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* this was the highest map
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* within the bitmap
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*/
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if (prev)
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e->highbit = prev->startbit + MAPSIZE;
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else
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e->highbit = 0;
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}
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if (prev)
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prev->next = n->next;
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else
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e->node = n->next;
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kfree(n);
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}
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}
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return 0;
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|
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}
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prev = n;
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n = n->next;
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}
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if (!value)
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return 0;
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|
2005-10-30 23:59:21 +01:00
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|
new = kzalloc(sizeof(*new), GFP_ATOMIC);
|
2005-04-17 00:20:36 +02:00
|
|
|
if (!new)
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|
return -ENOMEM;
|
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|
|
|
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|
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new->startbit = bit & ~(MAPSIZE - 1);
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|
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new->map = (MAPBIT << (bit - new->startbit));
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|
|
|
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|
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if (!n)
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|
|
/* this node will be the highest map within the bitmap */
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|
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e->highbit = new->startbit + MAPSIZE;
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|
|
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|
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if (prev) {
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|
|
new->next = prev->next;
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|
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prev->next = new;
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|
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} else {
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|
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new->next = e->node;
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|
|
e->node = new;
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|
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}
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|
return 0;
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|
|
}
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|
|
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|
void ebitmap_destroy(struct ebitmap *e)
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|
|
{
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struct ebitmap_node *n, *temp;
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|
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|
if (!e)
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return;
|
|
|
|
|
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n = e->node;
|
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|
|
while (n) {
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|
|
temp = n;
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|
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n = n->next;
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|
|
kfree(temp);
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|
|
}
|
|
|
|
|
|
|
|
e->highbit = 0;
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|
|
e->node = NULL;
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|
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return;
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|
|
|
}
|
|
|
|
|
|
|
|
int ebitmap_read(struct ebitmap *e, void *fp)
|
|
|
|
{
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|
|
|
int rc;
|
|
|
|
struct ebitmap_node *n, *l;
|
2005-09-04 00:55:17 +02:00
|
|
|
__le32 buf[3];
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|
|
u32 mapsize, count, i;
|
|
|
|
__le64 map;
|
2005-04-17 00:20:36 +02:00
|
|
|
|
|
|
|
ebitmap_init(e);
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|
|
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rc = next_entry(buf, fp, sizeof buf);
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|
|
if (rc < 0)
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|
|
goto out;
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|
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|
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|
|
mapsize = le32_to_cpu(buf[0]);
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|
|
e->highbit = le32_to_cpu(buf[1]);
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|
|
count = le32_to_cpu(buf[2]);
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|
|
|
|
|
|
if (mapsize != MAPSIZE) {
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|
|
printk(KERN_ERR "security: ebitmap: map size %u does not "
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|
|
|
"match my size %Zd (high bit was %d)\n", mapsize,
|
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|
|
MAPSIZE, e->highbit);
|
|
|
|
goto bad;
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|
|
|
}
|
|
|
|
if (!e->highbit) {
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|
|
e->node = NULL;
|
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|
|
goto ok;
|
|
|
|
}
|
|
|
|
if (e->highbit & (MAPSIZE - 1)) {
|
|
|
|
printk(KERN_ERR "security: ebitmap: high bit (%d) is not a "
|
|
|
|
"multiple of the map size (%Zd)\n", e->highbit, MAPSIZE);
|
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|
|
goto bad;
|
|
|
|
}
|
|
|
|
l = NULL;
|
|
|
|
for (i = 0; i < count; i++) {
|
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|
|
rc = next_entry(buf, fp, sizeof(u32));
|
|
|
|
if (rc < 0) {
|
|
|
|
printk(KERN_ERR "security: ebitmap: truncated map\n");
|
|
|
|
goto bad;
|
|
|
|
}
|
2005-10-30 23:59:21 +01:00
|
|
|
n = kzalloc(sizeof(*n), GFP_KERNEL);
|
2005-04-17 00:20:36 +02:00
|
|
|
if (!n) {
|
|
|
|
printk(KERN_ERR "security: ebitmap: out of memory\n");
|
|
|
|
rc = -ENOMEM;
|
|
|
|
goto bad;
|
|
|
|
}
|
|
|
|
|
|
|
|
n->startbit = le32_to_cpu(buf[0]);
|
|
|
|
|
|
|
|
if (n->startbit & (MAPSIZE - 1)) {
|
|
|
|
printk(KERN_ERR "security: ebitmap start bit (%d) is "
|
|
|
|
"not a multiple of the map size (%Zd)\n",
|
|
|
|
n->startbit, MAPSIZE);
|
|
|
|
goto bad_free;
|
|
|
|
}
|
|
|
|
if (n->startbit > (e->highbit - MAPSIZE)) {
|
|
|
|
printk(KERN_ERR "security: ebitmap start bit (%d) is "
|
|
|
|
"beyond the end of the bitmap (%Zd)\n",
|
|
|
|
n->startbit, (e->highbit - MAPSIZE));
|
|
|
|
goto bad_free;
|
|
|
|
}
|
|
|
|
rc = next_entry(&map, fp, sizeof(u64));
|
|
|
|
if (rc < 0) {
|
|
|
|
printk(KERN_ERR "security: ebitmap: truncated map\n");
|
|
|
|
goto bad_free;
|
|
|
|
}
|
|
|
|
n->map = le64_to_cpu(map);
|
|
|
|
|
|
|
|
if (!n->map) {
|
|
|
|
printk(KERN_ERR "security: ebitmap: null map in "
|
|
|
|
"ebitmap (startbit %d)\n", n->startbit);
|
|
|
|
goto bad_free;
|
|
|
|
}
|
|
|
|
if (l) {
|
|
|
|
if (n->startbit <= l->startbit) {
|
|
|
|
printk(KERN_ERR "security: ebitmap: start "
|
|
|
|
"bit %d comes after start bit %d\n",
|
|
|
|
n->startbit, l->startbit);
|
|
|
|
goto bad_free;
|
|
|
|
}
|
|
|
|
l->next = n;
|
|
|
|
} else
|
|
|
|
e->node = n;
|
|
|
|
|
|
|
|
l = n;
|
|
|
|
}
|
|
|
|
|
|
|
|
ok:
|
|
|
|
rc = 0;
|
|
|
|
out:
|
|
|
|
return rc;
|
|
|
|
bad_free:
|
|
|
|
kfree(n);
|
|
|
|
bad:
|
|
|
|
if (!rc)
|
|
|
|
rc = -EINVAL;
|
|
|
|
ebitmap_destroy(e);
|
|
|
|
goto out;
|
|
|
|
}
|