1 files changed, 340 insertions, 90 deletions

diff --git a/security/selinux/ss/ebitmap.c b/security/selinux/ss/ebitmap.c
index 47024a6e184..820313a04d4 100644
--- a/security/selinux/ss/ebitmap.c
+++ b/security/selinux/ss/ebitmap.c
@@ -3,12 +3,27 @@
  *
  * Author : Stephen Smalley, <sds@epoch.ncsc.mil>
  */
+/*
+ * Updated: Hewlett-Packard <paul@paul-moore.com>
+ *
+ *      Added support to import/export the NetLabel category bitmap
+ *
+ * (c) Copyright Hewlett-Packard Development Company, L.P., 2006
+ */
+/*
+ * Updated: KaiGai Kohei <kaigai@ak.jp.nec.com>
+ *      Applied standard bit operations to improve bitmap scanning.
+ */
+
 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/errno.h>
+#include <net/netlabel.h>
 #include "ebitmap.h"
 #include "policydb.h"
 
+#define BITS_PER_U64	(sizeof(u64) * 8)
+
 int ebitmap_cmp(struct ebitmap *e1, struct ebitmap *e2)
 {
 	struct ebitmap_node *n1, *n2;
@@ -20,7 +35,7 @@ int ebitmap_cmp(struct ebitmap *e1, struct ebitmap *e2)
 	n2 = e2->node;
 	while (n1 && n2 &&
 	       (n1->startbit == n2->startbit) &&
-	       (n1->map == n2->map)) {
+	       !memcmp(n1->maps, n2->maps, EBITMAP_SIZE / 8)) {
 		n1 = n1->next;
 		n2 = n2->next;
 	}
@@ -45,7 +60,7 @@ int ebitmap_cpy(struct ebitmap *dst, struct ebitmap *src)
 			return -ENOMEM;
 		}
 		new->startbit = n->startbit;
-		new->map = n->map;
+		memcpy(new->maps, n->maps, EBITMAP_SIZE / 8);
 		new->next = NULL;
 		if (prev)
 			prev->next = new;
@@ -59,22 +74,180 @@ int ebitmap_cpy(struct ebitmap *dst, struct ebitmap *src)
 	return 0;
 }
 
-int ebitmap_contains(struct ebitmap *e1, struct ebitmap *e2)
+#ifdef CONFIG_NETLABEL
+/**
+ * ebitmap_netlbl_export - Export an ebitmap into a NetLabel category bitmap
+ * @ebmap: the ebitmap to export
+ * @catmap: the NetLabel category bitmap
+ *
+ * Description:
+ * Export a SELinux extensibile bitmap into a NetLabel category bitmap.
+ * Returns zero on success, negative values on error.
+ *
+ */
+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.
+	 */
+
+	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);
+
+	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)
+					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;
+		}
+		e_iter = e_iter->next;
+	}
+
+	return 0;
+
+netlbl_export_failure:
+	netlbl_secattr_catmap_free(*catmap);
+	return -ENOMEM;
+}
+
+/**
+ * ebitmap_netlbl_import - Import a NetLabel category bitmap into an ebitmap
+ * @ebmap: the ebitmap to import
+ * @catmap: the NetLabel category bitmap
+ *
+ * Description:
+ * Import a NetLabel category bitmap into a SELinux extensibile bitmap.
+ * Returns zero on success, negative values on error.
+ *
+ */
+int ebitmap_netlbl_import(struct ebitmap *ebmap,
+			  struct netlbl_lsm_secattr_catmap *catmap)
+{
+	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;
+
+			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);
+			}
+		}
+		c_iter = c_iter->next;
+	} while (c_iter);
+	if (e_iter != NULL)
+		ebmap->highbit = e_iter->startbit + EBITMAP_SIZE;
+	else
+		ebitmap_destroy(ebmap);
+
+	return 0;
+
+netlbl_import_failure:
+	ebitmap_destroy(ebmap);
+	return -ENOMEM;
+}
+#endif /* CONFIG_NETLABEL */
+
+/*
+ * Check to see if all the bits set in e2 are also set in e1. Optionally,
+ * if last_e2bit is non-zero, the highest set bit in e2 cannot exceed
+ * last_e2bit.
+ */
+int ebitmap_contains(struct ebitmap *e1, struct ebitmap *e2, u32 last_e2bit)
 {
 	struct ebitmap_node *n1, *n2;
+	int i;
 
 	if (e1->highbit < e2->highbit)
 		return 0;
 
 	n1 = e1->node;
 	n2 = e2->node;
+
 	while (n1 && n2 && (n1->startbit <= n2->startbit)) {
 		if (n1->startbit < n2->startbit) {
 			n1 = n1->next;
 			continue;
 		}
-		if ((n1->map & n2->map) != n2->map)
-			return 0;
+		for (i = EBITMAP_UNIT_NUMS - 1; (i >= 0) && !n2->maps[i]; )
+			i--;	/* Skip trailing NULL map entries */
+		if (last_e2bit && (i >= 0)) {
+			u32 lastsetbit = n2->startbit + i * EBITMAP_UNIT_SIZE +
+					 __fls(n2->maps[i]);
+			if (lastsetbit > last_e2bit)
+				return 0;
+		}
+
+		while (i >= 0) {
+			if ((n1->maps[i] & n2->maps[i]) != n2->maps[i])
+				return 0;
+			i--;
+		}
 
 		n1 = n1->next;
 		n2 = n2->next;
@@ -95,12 +268,8 @@ int ebitmap_get_bit(struct ebitmap *e, unsigned long bit)
 
 	n = e->node;
 	while (n && (n->startbit <= bit)) {
-		if ((n->startbit + MAPSIZE) > bit) {
-			if (n->map & (MAPBIT << (bit - n->startbit)))
-				return 1;
-			else
-				return 0;
-		}
+		if ((n->startbit + EBITMAP_SIZE) > bit)
+			return ebitmap_node_get_bit(n, bit);
 		n = n->next;
 	}
 
@@ -114,31 +283,35 @@ int ebitmap_set_bit(struct ebitmap *e, unsigned long bit, int value)
 	prev = NULL;
 	n = e->node;
 	while (n && n->startbit <= bit) {
-		if ((n->startbit + MAPSIZE) > bit) {
+		if ((n->startbit + EBITMAP_SIZE) > bit) {
 			if (value) {
-				n->map |= (MAPBIT << (bit - n->startbit));
+				ebitmap_node_set_bit(n, bit);
 			} else {
-				n->map &= ~(MAPBIT << (bit - n->startbit));
-				if (!n->map) {
-					/* drop this node from the bitmap */
-
-					if (!n->next) {
-						/*
-						 * this was the highest map
-						 * within the bitmap
-						 */
-						if (prev)
-							e->highbit = prev->startbit + MAPSIZE;
-						else
-							e->highbit = 0;
-					}
+				unsigned int s;
+
+				ebitmap_node_clr_bit(n, bit);
+
+				s = find_first_bit(n->maps, EBITMAP_SIZE);
+				if (s < EBITMAP_SIZE)
+					return 0;
+
+				/* drop this node from the bitmap */
+				if (!n->next) {
+					/*
+					 * this was the highest map
+					 * within the bitmap
+					 */
 					if (prev)
-						prev->next = n->next;
+						e->highbit = prev->startbit
+							     + EBITMAP_SIZE;
 					else
-						e->node = n->next;
-
-					kfree(n);
+						e->highbit = 0;
 				}
+				if (prev)
+					prev->next = n->next;
+				else
+					e->node = n->next;
+				kfree(n);
 			}
 			return 0;
 		}
@@ -153,12 +326,12 @@ int ebitmap_set_bit(struct ebitmap *e, unsigned long bit, int value)
 	if (!new)
 		return -ENOMEM;
 
-	new->startbit = bit & ~(MAPSIZE - 1);
-	new->map = (MAPBIT << (bit - new->startbit));
+	new->startbit = bit - (bit % EBITMAP_SIZE);
+	ebitmap_node_set_bit(new, bit);
 
 	if (!n)
 		/* this node will be the highest map within the bitmap */
-		e->highbit = new->startbit + MAPSIZE;
+		e->highbit = new->startbit + EBITMAP_SIZE;
 
 	if (prev) {
 		new->next = prev->next;
@@ -192,11 +365,11 @@ void ebitmap_destroy(struct ebitmap *e)
 
 int ebitmap_read(struct ebitmap *e, void *fp)
 {
-	int rc;
-	struct ebitmap_node *n, *l;
+	struct ebitmap_node *n = NULL;
+	u32 mapunit, count, startbit, index;
+	u64 map;
 	__le32 buf[3];
-	u32 mapsize, count, i;
-	__le64 map;
+	int rc, i;
 
 	ebitmap_init(e);
 
@@ -204,88 +377,165 @@ int ebitmap_read(struct ebitmap *e, void *fp)
 	if (rc < 0)
 		goto out;
 
-	mapsize = le32_to_cpu(buf[0]);
+	mapunit = le32_to_cpu(buf[0]);
 	e->highbit = le32_to_cpu(buf[1]);
 	count = le32_to_cpu(buf[2]);
 
-	if (mapsize != MAPSIZE) {
-		printk(KERN_ERR "security: ebitmap: map size %u does not "
-		       "match my size %Zd (high bit was %d)\n", mapsize,
-		       MAPSIZE, e->highbit);
+	if (mapunit != BITS_PER_U64) {
+		printk(KERN_ERR "SELinux: ebitmap: map size %u does not "
+		       "match my size %Zd (high bit was %d)\n",
+		       mapunit, BITS_PER_U64, e->highbit);
 		goto bad;
 	}
+
+	/* round up e->highbit */
+	e->highbit += EBITMAP_SIZE - 1;
+	e->highbit -= (e->highbit % EBITMAP_SIZE);
+
 	if (!e->highbit) {
 		e->node = NULL;
 		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);
-		goto bad;
-	}
-	l = NULL;
+
 	for (i = 0; i < count; i++) {
-		rc = next_entry(buf, fp, sizeof(u32));
+		rc = next_entry(&startbit, fp, sizeof(u32));
 		if (rc < 0) {
-			printk(KERN_ERR "security: ebitmap: truncated map\n");
+			printk(KERN_ERR "SELinux: ebitmap: truncated map\n");
 			goto bad;
 		}
-		n = kzalloc(sizeof(*n), GFP_KERNEL);
-		if (!n) {
-			printk(KERN_ERR "security: ebitmap: out of memory\n");
-			rc = -ENOMEM;
+		startbit = le32_to_cpu(startbit);
+
+		if (startbit & (mapunit - 1)) {
+			printk(KERN_ERR "SELinux: ebitmap start bit (%d) is "
+			       "not a multiple of the map unit size (%u)\n",
+			       startbit, mapunit);
 			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 (startbit > e->highbit - mapunit) {
+			printk(KERN_ERR "SELinux: ebitmap start bit (%d) is "
+			       "beyond the end of the bitmap (%u)\n",
+			       startbit, (e->highbit - mapunit));
+			goto bad;
 		}
-		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;
+
+		if (!n || startbit >= n->startbit + EBITMAP_SIZE) {
+			struct ebitmap_node *tmp;
+			tmp = kzalloc(sizeof(*tmp), GFP_KERNEL);
+			if (!tmp) {
+				printk(KERN_ERR
+				       "SELinux: ebitmap: out of memory\n");
+				rc = -ENOMEM;
+				goto bad;
+			}
+			/* round down */
+			tmp->startbit = startbit - (startbit % EBITMAP_SIZE);
+			if (n)
+				n->next = tmp;
+			else
+				e->node = tmp;
+			n = tmp;
+		} else if (startbit <= n->startbit) {
+			printk(KERN_ERR "SELinux: ebitmap: start bit %d"
+			       " comes after start bit %d\n",
+			       startbit, n->startbit);
+			goto bad;
 		}
+
 		rc = next_entry(&map, fp, sizeof(u64));
 		if (rc < 0) {
-			printk(KERN_ERR "security: ebitmap: truncated map\n");
-			goto bad_free;
+			printk(KERN_ERR "SELinux: ebitmap: truncated map\n");
+			goto bad;
 		}
-		n->map = le64_to_cpu(map);
+		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;
+		index = (startbit - n->startbit) / EBITMAP_UNIT_SIZE;
+		while (map) {
+			n->maps[index++] = map & (-1UL);
+			map = EBITMAP_SHIFT_UNIT_SIZE(map);
 		}
-		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;
 }
+
+int ebitmap_write(struct ebitmap *e, void *fp)
+{
+	struct ebitmap_node *n;
+	u32 count;
+	__le32 buf[3];
+	u64 map;
+	int bit, last_bit, last_startbit, rc;
+
+	buf[0] = cpu_to_le32(BITS_PER_U64);
+
+	count = 0;
+	last_bit = 0;
+	last_startbit = -1;
+	ebitmap_for_each_positive_bit(e, n, bit) {
+		if (rounddown(bit, (int)BITS_PER_U64) > last_startbit) {
+			count++;
+			last_startbit = rounddown(bit, BITS_PER_U64);
+		}
+		last_bit = roundup(bit + 1, BITS_PER_U64);
+	}
+	buf[1] = cpu_to_le32(last_bit);
+	buf[2] = cpu_to_le32(count);
+
+	rc = put_entry(buf, sizeof(u32), 3, fp);
+	if (rc)
+		return rc;
+
+	map = 0;
+	last_startbit = INT_MIN;
+	ebitmap_for_each_positive_bit(e, n, bit) {
+		if (rounddown(bit, (int)BITS_PER_U64) > last_startbit) {
+			__le64 buf64[1];
+
+			/* this is the very first bit */
+			if (!map) {
+				last_startbit = rounddown(bit, BITS_PER_U64);
+				map = (u64)1 << (bit - last_startbit);
+				continue;
+			}
+
+			/* write the last node */
+			buf[0] = cpu_to_le32(last_startbit);
+			rc = put_entry(buf, sizeof(u32), 1, fp);
+			if (rc)
+				return rc;
+
+			buf64[0] = cpu_to_le64(map);
+			rc = put_entry(buf64, sizeof(u64), 1, fp);
+			if (rc)
+				return rc;
+
+			/* set up for the next node */
+			map = 0;
+			last_startbit = rounddown(bit, BITS_PER_U64);
+		}
+		map |= (u64)1 << (bit - last_startbit);
+	}
+	/* write the last node */
+	if (map) {
+		__le64 buf64[1];
+
+		/* write the last node */
+		buf[0] = cpu_to_le32(last_startbit);
+		rc = put_entry(buf, sizeof(u32), 1, fp);
+		if (rc)
+			return rc;
+
+		buf64[0] = cpu_to_le64(map);
+		rc = put_entry(buf64, sizeof(u64), 1, fp);
+		if (rc)
+			return rc;
+	}
+	return 0;
+}