Re: [PATCH] aliases for the boundry format

Joshua Brindle <method@xxxxxxxxxxxxxxx> · Fri, 13 Feb 2009 11:14:06 -0500

Caleb Case wrote:
The boundry format mapped the primary field to a boolean in the
properties bitmap. This is appropriate for the kernel policy, but in
modular policy the primary field may be an integer that indicates the
primary type that is being aliased. In this case, the primary value cannot
be assumed to be boolean.

This patch creates a new module format that writes out the primary value
as was done before the boundry format.

Signed-off-by: Caleb Case <ccase@xxxxxxxxxx>

I Guess noone else wants to look at this patch. I already acked it before it was 
sent to the list so if noone has objections I'll apply it later today.

We need to be sure this will make it into F11, is that possible?


---
 
 checkpolicy/module_compiler.c              |    2 +-
 checkpolicy/policy_define.c                |   13 +++++++-
 libsepol/include/sepol/policydb/policydb.h |   19 +++++-----
 libsepol/src/policydb.c                    |   50 +++++++++++++++++++++------
 libsepol/src/write.c                       |    5 +++
 5 files changed, 67 insertions(+), 22 deletions(-)

diff --git a/checkpolicy/module_compiler.c b/checkpolicy/module_compiler.c
index 36d20be..d6ebd78 100644
--- a/checkpolicy/module_compiler.c
+++ b/checkpolicy/module_compiler.c
@@ -136,7 +136,7 @@ int declare_symbol(uint32_t symbol_type,
 	}
 	retval = symtab_insert(policydbp, symbol_type, key, datum,
 			       SCOPE_DECL, decl->decl_id, dest_value);
-	if (retval == 1) {
+	if (retval == 1 && dest_value) {
 		symtab_datum_t *s =
 		    (symtab_datum_t *) hashtab_search(policydbp->
 						      symtab[symbol_type].table,
diff --git a/checkpolicy/policy_define.c b/checkpolicy/policy_define.c
index 25b06c1..17b84ce 100644
--- a/checkpolicy/policy_define.c
+++ b/checkpolicy/policy_define.c
@@ -1015,8 +1015,19 @@ static int add_aliases_to_type(type_datum_t * type)
 				yyerror("could not declare alias here");
 				goto cleanup;
 			}
-		case 0:
+		case 0:	 	break;
 		case 1:{
+				/* ret == 1 means the alias was required and therefore already
+				 * has a value. Set it up as an alias with a different primary. */
+				type_datum_destroy(aliasdatum);
+				free(aliasdatum);
+
+				aliasdatum = hashtab_search(policydbp->symtab[SYM_TYPES].table, id);
+				assert(aliasdatum);
+
+				aliasdatum->primary = type->s.value;
+				aliasdatum->flavor = TYPE_ALIAS;
+
 				break;
 			}
 		default:{
diff --git a/libsepol/include/sepol/policydb/policydb.h b/libsepol/include/sepol/policydb/policydb.h
index eede389..0105cf4 100644
--- a/libsepol/include/sepol/policydb/policydb.h
+++ b/libsepol/include/sepol/policydb/policydb.h
@@ -614,17 +614,18 @@ extern int policydb_write(struct policydb *p, struct policy_file *pf);
 #define POLICYDB_VERSION_MAX	POLICYDB_VERSION_BOUNDARY
 
 /* Module versions and specific changes*/
-#define MOD_POLICYDB_VERSION_BASE	   4
-#define MOD_POLICYDB_VERSION_VALIDATETRANS 5
-#define MOD_POLICYDB_VERSION_MLS	   5
-#define MOD_POLICYDB_VERSION_RANGETRANS	   6
-#define MOD_POLICYDB_VERSION_MLS_USERS	   6
-#define MOD_POLICYDB_VERSION_POLCAP	   7
-#define MOD_POLICYDB_VERSION_PERMISSIVE	   8
-#define MOD_POLICYDB_VERSION_BOUNDARY      9
+#define MOD_POLICYDB_VERSION_BASE		4
+#define MOD_POLICYDB_VERSION_VALIDATETRANS	5
+#define MOD_POLICYDB_VERSION_MLS		5
+#define MOD_POLICYDB_VERSION_RANGETRANS 	6
+#define MOD_POLICYDB_VERSION_MLS_USERS		6
+#define MOD_POLICYDB_VERSION_POLCAP		7
+#define MOD_POLICYDB_VERSION_PERMISSIVE		8
+#define MOD_POLICYDB_VERSION_BOUNDARY		9
+#define MOD_POLICYDB_VERSION_BOUNDARY_ALIAS	10
 
 #define MOD_POLICYDB_VERSION_MIN MOD_POLICYDB_VERSION_BASE
-#define MOD_POLICYDB_VERSION_MAX MOD_POLICYDB_VERSION_BOUNDARY
+#define MOD_POLICYDB_VERSION_MAX MOD_POLICYDB_VERSION_BOUNDARY_ALIAS
 
 #define POLICYDB_CONFIG_MLS    1
 
diff --git a/libsepol/src/policydb.c b/libsepol/src/policydb.c
index d623343..85ddefc 100644
--- a/libsepol/src/policydb.c
+++ b/libsepol/src/policydb.c
@@ -153,6 +153,12 @@ static struct policydb_compat_info policydb_compat[] = {
 	 .ocon_num = OCON_NODE6 + 1,
 	},
 	{
+	 .type = POLICY_BASE,
+	 .version = MOD_POLICYDB_VERSION_BOUNDARY_ALIAS,
+	 .sym_num = SYM_NUM,
+	 .ocon_num = OCON_NODE6 + 1,
+	},
+	{
 	 .type = POLICY_MOD,
 	 .version = MOD_POLICYDB_VERSION_BASE,
 	 .sym_num = SYM_NUM,
@@ -188,6 +194,12 @@ static struct policydb_compat_info policydb_compat[] = {
 	 .sym_num = SYM_NUM,
 	 .ocon_num = 0
 	},
+	{
+	 .type = POLICY_MOD,
+	 .version = MOD_POLICYDB_VERSION_BOUNDARY_ALIAS,
+	 .sym_num = SYM_NUM,
+	 .ocon_num = 0
+	},
 };
 
 #if 0
@@ -1942,13 +1954,19 @@ static int type_read(policydb_t * p
 	uint32_t buf[5];
 	size_t len;
 	int rc, to_read;
+	int pos = 0;
 
 	typdatum = calloc(1, sizeof(type_datum_t));
 	if (!typdatum)
 		return -1;
 
-	if (policydb_has_boundary_feature(p))
-		to_read = 4;
+	if (policydb_has_boundary_feature(p)) {
+		if (p->policy_type != POLICY_KERN
+		    && p->policyvers >= MOD_POLICYDB_VERSION_BOUNDARY_ALIAS)
+			to_read = 5;
+		else
+			to_read = 4;
+	}
 	else if (p->policy_type == POLICY_KERN)
 		to_read = 3;
 	else if (p->policyvers >= MOD_POLICYDB_VERSION_PERMISSIVE)
@@ -1960,13 +1978,23 @@ static int type_read(policydb_t * p
 	if (rc < 0)
 		goto bad;
 
-	len = le32_to_cpu(buf[0]);
-	typdatum->s.value = le32_to_cpu(buf[1]);
+	len = le32_to_cpu(buf[pos]);
+	typdatum->s.value = le32_to_cpu(buf[++pos]);
 	if (policydb_has_boundary_feature(p)) {
-		uint32_t properties = le32_to_cpu(buf[2]);
+		uint32_t properties;
+
+		if (p->policy_type != POLICY_KERN
+		    && p->policyvers >= MOD_POLICYDB_VERSION_BOUNDARY_ALIAS) {
+			typdatum->primary = le32_to_cpu(buf[++pos]);
+			properties = le32_to_cpu(buf[++pos]);
+		}
+		else {
+			properties = le32_to_cpu(buf[++pos]);
+
+			if (properties & TYPEDATUM_PROPERTY_PRIMARY)
+				typdatum->primary = 1;
+		}
 
-		if (properties & TYPEDATUM_PROPERTY_PRIMARY)
-			typdatum->primary = 1;
 		if (properties & TYPEDATUM_PROPERTY_ATTRIBUTE)
 			typdatum->flavor = TYPE_ATTRIB;
 		if (properties & TYPEDATUM_PROPERTY_ALIAS
@@ -1976,13 +2004,13 @@ static int type_read(policydb_t * p
 		    && p->policy_type != POLICY_KERN)
 			typdatum->flags |= TYPE_FLAGS_PERMISSIVE;
 
-		typdatum->bounds = le32_to_cpu(buf[3]);
+		typdatum->bounds = le32_to_cpu(buf[++pos]);
 	} else {
-		typdatum->primary = le32_to_cpu(buf[2]);
+		typdatum->primary = le32_to_cpu(buf[++pos]);
 		if (p->policy_type != POLICY_KERN) {
-			typdatum->flavor = le32_to_cpu(buf[3]);
+			typdatum->flavor = le32_to_cpu(buf[++pos]);
 			if (p->policyvers >= MOD_POLICYDB_VERSION_PERMISSIVE)
-				typdatum->flags = le32_to_cpu(buf[4]);
+				typdatum->flags = le32_to_cpu(buf[++pos]);
 		}
 	}
 
diff --git a/libsepol/src/write.c b/libsepol/src/write.c
index bffadcf..66b35ec 100644
--- a/libsepol/src/write.c
+++ b/libsepol/src/write.c
@@ -970,6 +970,11 @@ static int type_write(hashtab_key_t key, hashtab_datum_t datum, void *ptr)
 	if (policydb_has_boundary_feature(p)) {
 		uint32_t properties = 0;
 
+		if (p->policy_type != POLICY_KERN
+		    && p->policyvers >= MOD_POLICYDB_VERSION_BOUNDARY_ALIAS) {
+			buf[items++] = cpu_to_le32(typdatum->primary);
+		}
+
 		if (typdatum->primary)
 			properties |= TYPEDATUM_PROPERTY_PRIMARY;
 

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