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-rw-r--r--security/selinux/ss/ebitmap.c198
1 files changed, 89 insertions, 109 deletions
diff --git a/security/selinux/ss/ebitmap.c b/security/selinux/ss/ebitmap.c
index d539346ab3a2..ce492a6b38ed 100644
--- a/security/selinux/ss/ebitmap.c
+++ b/security/selinux/ss/ebitmap.c
@@ -6,7 +6,7 @@
/*
* Updated: Hewlett-Packard <paul.moore@hp.com>
*
- * Added ebitmap_export() and ebitmap_import()
+ * Added support to import/export the NetLabel category bitmap
*
* (c) Copyright Hewlett-Packard Development Company, L.P., 2006
*/
@@ -14,6 +14,7 @@
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/errno.h>
+#include <net/netlabel.h>
#include "ebitmap.h"
#include "policydb.h"
@@ -67,141 +68,120 @@ int ebitmap_cpy(struct ebitmap *dst, struct ebitmap *src)
return 0;
}
+#ifdef CONFIG_NETLABEL
/**
- * ebitmap_export - Export an ebitmap to a unsigned char bitmap string
- * @src: the ebitmap to export
- * @dst: the resulting bitmap string
- * @dst_len: length of dst in bytes
+ * ebitmap_netlbl_export - Export an ebitmap into a NetLabel category bitmap
+ * @ebmap: the ebitmap to export
+ * @catmap: the NetLabel category bitmap
*
* Description:
- * Allocate a buffer at least src->highbit bits long and export the extensible
- * bitmap into the buffer. The bitmap string will be in little endian format,
- * i.e. LSB first. The value returned in dst_len may not the true size of the
- * buffer as the length of the buffer is rounded up to a multiple of MAPTYPE.
- * The caller must free the buffer when finished. Returns zero on success,
- * negative values on failure.
+ * Export a SELinux extensibile bitmap into a NetLabel category bitmap.
+ * Returns zero on success, negative values on error.
*
*/
-int ebitmap_export(const struct ebitmap *src,
- unsigned char **dst,
- size_t *dst_len)
+int ebitmap_netlbl_export(struct ebitmap *ebmap,
+ struct netlbl_lsm_secattr_catmap **catmap)
{
- size_t bitmap_len;
- unsigned char *bitmap;
- struct ebitmap_node *iter_node;
- MAPTYPE node_val;
- size_t bitmap_byte;
- unsigned char bitmask;
-
- if (src->highbit == 0) {
- *dst = NULL;
- *dst_len = 0;
+ struct ebitmap_node *e_iter = ebmap->node;
+ struct netlbl_lsm_secattr_catmap *c_iter;
+ u32 cmap_idx;
+
+ /* This function is a much simpler because SELinux's MAPTYPE happens
+ * to be the same as NetLabel's NETLBL_CATMAP_MAPTYPE, if MAPTYPE is
+ * changed from a u64 this function will most likely need to be changed
+ * as well. It's not ideal but I think the tradeoff in terms of
+ * neatness and speed is worth it. */
+
+ if (e_iter == NULL) {
+ *catmap = NULL;
return 0;
}
- bitmap_len = src->highbit / 8;
- if (src->highbit % 7)
- bitmap_len += 1;
-
- bitmap = kzalloc((bitmap_len & ~(sizeof(MAPTYPE) - 1)) +
- sizeof(MAPTYPE),
- GFP_ATOMIC);
- if (bitmap == NULL)
+ c_iter = netlbl_secattr_catmap_alloc(GFP_ATOMIC);
+ if (c_iter == NULL)
return -ENOMEM;
+ *catmap = c_iter;
+ c_iter->startbit = e_iter->startbit & ~(NETLBL_CATMAP_SIZE - 1);
+
+ while (e_iter != NULL) {
+ if (e_iter->startbit >=
+ (c_iter->startbit + NETLBL_CATMAP_SIZE)) {
+ c_iter->next = netlbl_secattr_catmap_alloc(GFP_ATOMIC);
+ if (c_iter->next == NULL)
+ goto netlbl_export_failure;
+ c_iter = c_iter->next;
+ c_iter->startbit = e_iter->startbit &
+ ~(NETLBL_CATMAP_SIZE - 1);
+ }
+ cmap_idx = (e_iter->startbit - c_iter->startbit) /
+ NETLBL_CATMAP_MAPSIZE;
+ c_iter->bitmap[cmap_idx] = e_iter->map;
+ e_iter = e_iter->next;
+ }
- iter_node = src->node;
- do {
- bitmap_byte = iter_node->startbit / 8;
- bitmask = 0x80;
- node_val = iter_node->map;
- do {
- if (bitmask == 0) {
- bitmap_byte++;
- bitmask = 0x80;
- }
- if (node_val & (MAPTYPE)0x01)
- bitmap[bitmap_byte] |= bitmask;
- node_val >>= 1;
- bitmask >>= 1;
- } while (node_val > 0);
- iter_node = iter_node->next;
- } while (iter_node);
-
- *dst = bitmap;
- *dst_len = bitmap_len;
return 0;
+
+netlbl_export_failure:
+ netlbl_secattr_catmap_free(*catmap);
+ return -ENOMEM;
}
/**
- * ebitmap_import - Import an unsigned char bitmap string into an ebitmap
- * @src: the bitmap string
- * @src_len: the bitmap length in bytes
- * @dst: the empty ebitmap
+ * ebitmap_netlbl_import - Import a NetLabel category bitmap into an ebitmap
+ * @ebmap: the ebitmap to export
+ * @catmap: the NetLabel category bitmap
*
* Description:
- * This function takes a little endian bitmap string in src and imports it into
- * the ebitmap pointed to by dst. Returns zero on success, negative values on
- * failure.
+ * Import a NetLabel category bitmap into a SELinux extensibile bitmap.
+ * Returns zero on success, negative values on error.
*
*/
-int ebitmap_import(const unsigned char *src,
- size_t src_len,
- struct ebitmap *dst)
+int ebitmap_netlbl_import(struct ebitmap *ebmap,
+ struct netlbl_lsm_secattr_catmap *catmap)
{
- size_t src_off = 0;
- size_t node_limit;
- struct ebitmap_node *node_new;
- struct ebitmap_node *node_last = NULL;
- u32 i_byte;
- u32 i_bit;
- unsigned char src_byte;
-
- while (src_off < src_len) {
- if (src_len - src_off >= sizeof(MAPTYPE)) {
- if (*(MAPTYPE *)&src[src_off] == 0) {
- src_off += sizeof(MAPTYPE);
- continue;
- }
- node_limit = sizeof(MAPTYPE);
- } else {
- for (src_byte = 0, i_byte = src_off;
- i_byte < src_len && src_byte == 0;
- i_byte++)
- src_byte |= src[i_byte];
- if (src_byte == 0)
- break;
- node_limit = src_len - src_off;
- }
+ struct ebitmap_node *e_iter = NULL;
+ struct ebitmap_node *emap_prev = NULL;
+ struct netlbl_lsm_secattr_catmap *c_iter = catmap;
+ u32 c_idx;
- node_new = kzalloc(sizeof(*node_new), GFP_ATOMIC);
- if (unlikely(node_new == NULL)) {
- ebitmap_destroy(dst);
- return -ENOMEM;
- }
- node_new->startbit = src_off * 8;
- for (i_byte = 0; i_byte < node_limit; i_byte++) {
- src_byte = src[src_off++];
- for (i_bit = i_byte * 8; src_byte != 0; i_bit++) {
- if (src_byte & 0x80)
- node_new->map |= MAPBIT << i_bit;
- src_byte <<= 1;
- }
- }
+ /* This function is a much simpler because SELinux's MAPTYPE happens
+ * to be the same as NetLabel's NETLBL_CATMAP_MAPTYPE, if MAPTYPE is
+ * changed from a u64 this function will most likely need to be changed
+ * as well. It's not ideal but I think the tradeoff in terms of
+ * neatness and speed is worth it. */
- if (node_last != NULL)
- node_last->next = node_new;
- else
- dst->node = node_new;
- node_last = node_new;
- }
+ do {
+ for (c_idx = 0; c_idx < NETLBL_CATMAP_MAPCNT; c_idx++) {
+ if (c_iter->bitmap[c_idx] == 0)
+ continue;
+
+ e_iter = kzalloc(sizeof(*e_iter), GFP_ATOMIC);
+ if (e_iter == NULL)
+ goto netlbl_import_failure;
+ if (emap_prev == NULL)
+ ebmap->node = e_iter;
+ else
+ emap_prev->next = e_iter;
+ emap_prev = e_iter;
- if (likely(node_last != NULL))
- dst->highbit = node_last->startbit + MAPSIZE;
+ e_iter->startbit = c_iter->startbit +
+ NETLBL_CATMAP_MAPSIZE * c_idx;
+ e_iter->map = c_iter->bitmap[c_idx];
+ }
+ c_iter = c_iter->next;
+ } while (c_iter != NULL);
+ if (e_iter != NULL)
+ ebmap->highbit = e_iter->startbit + MAPSIZE;
else
- ebitmap_init(dst);
+ ebitmap_destroy(ebmap);
return 0;
+
+netlbl_import_failure:
+ ebitmap_destroy(ebmap);
+ return -ENOMEM;
}
+#endif /* CONFIG_NETLABEL */
int ebitmap_contains(struct ebitmap *e1, struct ebitmap *e2)
{

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