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-rw-r--r--security/selinux/ss/ebitmap.c127
1 files changed, 49 insertions, 78 deletions
diff --git a/security/selinux/ss/ebitmap.c b/security/selinux/ss/ebitmap.c
index 820313a04d49..842deca9484d 100644
--- a/security/selinux/ss/ebitmap.c
+++ b/security/selinux/ss/ebitmap.c
@@ -89,48 +89,33 @@ int ebitmap_netlbl_export(struct ebitmap *ebmap,
struct netlbl_lsm_secattr_catmap **catmap)
{
struct ebitmap_node *e_iter = ebmap->node;
- struct netlbl_lsm_secattr_catmap *c_iter;
- u32 cmap_idx, cmap_sft;
- int i;
-
- /* NetLabel's NETLBL_CATMAP_MAPTYPE is defined as an array of u64,
- * however, it is not always compatible with an array of unsigned long
- * in ebitmap_node.
- * In addition, you should pay attention the following implementation
- * assumes unsigned long has a width equal with or less than 64-bit.
- */
+ unsigned long e_map;
+ u32 offset;
+ unsigned int iter;
+ int rc;
if (e_iter == NULL) {
*catmap = NULL;
return 0;
}
- 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);
+ if (*catmap != NULL)
+ netlbl_secattr_catmap_free(*catmap);
+ *catmap = NULL;
while (e_iter) {
- for (i = 0; i < EBITMAP_UNIT_NUMS; i++) {
- unsigned int delta, e_startbit, c_endbit;
-
- e_startbit = e_iter->startbit + i * EBITMAP_UNIT_SIZE;
- c_endbit = c_iter->startbit + NETLBL_CATMAP_SIZE;
- if (e_startbit >= c_endbit) {
- c_iter->next
- = netlbl_secattr_catmap_alloc(GFP_ATOMIC);
- if (c_iter->next == NULL)
+ offset = e_iter->startbit;
+ for (iter = 0; iter < EBITMAP_UNIT_NUMS; iter++) {
+ e_map = e_iter->maps[iter];
+ if (e_map != 0) {
+ rc = netlbl_secattr_catmap_setlong(catmap,
+ offset,
+ e_map,
+ GFP_ATOMIC);
+ if (rc != 0)
goto netlbl_export_failure;
- c_iter = c_iter->next;
- c_iter->startbit
- = e_startbit & ~(NETLBL_CATMAP_SIZE - 1);
}
- delta = e_startbit - c_iter->startbit;
- cmap_idx = delta / NETLBL_CATMAP_MAPSIZE;
- cmap_sft = delta % NETLBL_CATMAP_MAPSIZE;
- c_iter->bitmap[cmap_idx]
- |= e_iter->maps[i] << cmap_sft;
+ offset += EBITMAP_UNIT_SIZE;
}
e_iter = e_iter->next;
}
@@ -155,56 +140,42 @@ netlbl_export_failure:
int ebitmap_netlbl_import(struct ebitmap *ebmap,
struct netlbl_lsm_secattr_catmap *catmap)
{
+ int rc;
struct ebitmap_node *e_iter = NULL;
- struct ebitmap_node *emap_prev = NULL;
- struct netlbl_lsm_secattr_catmap *c_iter = catmap;
- u32 c_idx, c_pos, e_idx, e_sft;
-
- /* NetLabel's NETLBL_CATMAP_MAPTYPE is defined as an array of u64,
- * however, it is not always compatible with an array of unsigned long
- * in ebitmap_node.
- * In addition, you should pay attention the following implementation
- * assumes unsigned long has a width equal with or less than 64-bit.
- */
-
- do {
- for (c_idx = 0; c_idx < NETLBL_CATMAP_MAPCNT; c_idx++) {
- unsigned int delta;
- u64 map = c_iter->bitmap[c_idx];
-
- if (!map)
- continue;
+ struct ebitmap_node *e_prev = NULL;
+ u32 offset = 0, idx;
+ unsigned long bitmap;
+
+ for (;;) {
+ rc = netlbl_secattr_catmap_getlong(catmap, &offset, &bitmap);
+ if (rc < 0)
+ goto netlbl_import_failure;
+ if (offset == (u32)-1)
+ return 0;
- c_pos = c_iter->startbit
- + c_idx * NETLBL_CATMAP_MAPSIZE;
- if (!e_iter
- || c_pos >= e_iter->startbit + EBITMAP_SIZE) {
- e_iter = kzalloc(sizeof(*e_iter), GFP_ATOMIC);
- if (!e_iter)
- goto netlbl_import_failure;
- e_iter->startbit
- = c_pos - (c_pos % EBITMAP_SIZE);
- if (emap_prev == NULL)
- ebmap->node = e_iter;
- else
- emap_prev->next = e_iter;
- emap_prev = e_iter;
- }
- delta = c_pos - e_iter->startbit;
- e_idx = delta / EBITMAP_UNIT_SIZE;
- e_sft = delta % EBITMAP_UNIT_SIZE;
- while (map) {
- e_iter->maps[e_idx++] |= map & (-1UL);
- map = EBITMAP_SHIFT_UNIT_SIZE(map);
- }
+ if (e_iter == NULL ||
+ offset >= e_iter->startbit + EBITMAP_SIZE) {
+ e_prev = e_iter;
+ e_iter = kzalloc(sizeof(*e_iter), GFP_ATOMIC);
+ if (e_iter == NULL)
+ goto netlbl_import_failure;
+ e_iter->startbit = offset & ~(EBITMAP_SIZE - 1);
+ if (e_prev == NULL)
+ ebmap->node = e_iter;
+ else
+ e_prev->next = e_iter;
+ ebmap->highbit = e_iter->startbit + EBITMAP_SIZE;
}
- c_iter = c_iter->next;
- } while (c_iter);
- if (e_iter != NULL)
- ebmap->highbit = e_iter->startbit + EBITMAP_SIZE;
- else
- ebitmap_destroy(ebmap);
+ /* offset will always be aligned to an unsigned long */
+ idx = EBITMAP_NODE_INDEX(e_iter, offset);
+ e_iter->maps[idx] = bitmap;
+
+ /* next */
+ offset += EBITMAP_UNIT_SIZE;
+ }
+
+ /* NOTE: we should never reach this return */
return 0;
netlbl_import_failure: