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libsepol/cil: Do not call ebitmap_init twice for an ebitmap 

While it does no harm to call ebitmap_init() twice for an ebitmap,
since it is just memsetting the ebitmap to 0, it is poor practice.

In the function cil_type_matches() in cil_find.c, either ebitmap_and()
or ebitmap_set_bit() will be called. The function ebitmap_and() will
call ebitmap_init() on the destination ebitmap, but ebitmap_set_bit()
does not.

Instead of calling ebitmap_init() before the call to cil_type_matches(),
let cil_type_matches() make the call if it is going to call
ebitmap_set_bit(). It can also call ebitmap_destroy() on an error.

Since we are removing the call to ebitmap_init() in cil_self_match_any(),
cleanup some other things in the function (like using the FLAVOR()
macro and using ebitmap_is_empty()).

Signed-off-by: James Carter <jwcart2@gmail.com>
Acked-by: Petr Lautrbach <lautrbach@redhat.com>
This commit is contained in:
James Carter 2023-04-12 10:18:39 -04:00
parent cd575089db
commit 2b3dd2c77d
1 changed files with 31 additions and 29 deletions
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38
libsepol/cil/src/cil_find.c
View File

@ -85,29 +85,34 @@ static int cil_type_matches(ebitmap_t *matches, struct cil_symtab_datum *d1, str
enum cil_flavor f1 = FLAVOR(d1);
enum cil_flavor f2 = FLAVOR(d2);
if (f1 == CIL_TYPEATTRIBUTE && f2 == CIL_TYPEATTRIBUTE) {
struct cil_typeattribute *a1 = (struct cil_typeattribute *)d1;
struct cil_typeattribute *a2 = (struct cil_typeattribute *)d2;
rc = ebitmap_and(matches, a1->types, a2->types);
} else {
ebitmap_init(matches);
if (f1 != CIL_TYPEATTRIBUTE && f2 != CIL_TYPEATTRIBUTE) {
struct cil_type *t1 = (struct cil_type *)d1;
struct cil_type *t2 = (struct cil_type *)d2;
if (t1->value == t2->value) {
ebitmap_set_bit(matches, t1->value, 1);
rc = ebitmap_set_bit(matches, t1->value, 1);
}
} else if (f1 == CIL_TYPEATTRIBUTE && f2 != CIL_TYPEATTRIBUTE) {
struct cil_typeattribute *a = (struct cil_typeattribute *)d1;
struct cil_type *t = (struct cil_type *)d2;
if (ebitmap_get_bit(a->types, t->value)) {
ebitmap_set_bit(matches, t->value, 1);
rc = ebitmap_set_bit(matches, t->value, 1);
}
} else if (f1 != CIL_TYPEATTRIBUTE && f2 == CIL_TYPEATTRIBUTE) {
} else { // f1 != CIL_TYPEATTRIBUTE && f2 == CIL_TYPEATTRIBUTE
struct cil_type *t = (struct cil_type *)d1;
struct cil_typeattribute *a = (struct cil_typeattribute *)d2;
if (ebitmap_get_bit(a->types, t->value)) {
ebitmap_set_bit(matches, t->value, 1);
rc = ebitmap_set_bit(matches, t->value, 1);
}
}
if (rc != SEPOL_OK) {
ebitmap_destroy(matches);
}
} else {
/* Both are attributes */
struct cil_typeattribute *a1 = (struct cil_typeattribute *)d1;
struct cil_typeattribute *a2 = (struct cil_typeattribute *)d2;
rc = ebitmap_and(matches, a1->types, a2->types);
}
return rc;
@ -115,31 +120,28 @@ static int cil_type_matches(ebitmap_t *matches, struct cil_symtab_datum *d1, str
/* s1 is the src type that is matched with a self
* s2, and t2 are the source and type of the other rule
* Assumes there is a match between s1 and s2
*/
static int cil_self_match_any(struct cil_symtab_datum *s1, struct cil_symtab_datum *s2, struct cil_symtab_datum *t2)
{
int rc;
struct cil_tree_node *n1 = NODE(s1);
if (n1->flavor != CIL_TYPEATTRIBUTE) {
if (FLAVOR(s1) != CIL_TYPEATTRIBUTE) {
rc = cil_type_match_any(s1, t2);
} else {
struct cil_typeattribute *a = (struct cil_typeattribute *)s1;
ebitmap_t map;
ebitmap_init(&map);
rc = cil_type_matches(&map, s2, t2);
if (rc < 0) {
ebitmap_destroy(&map);
goto exit;
return rc;
}
if (map.node == NULL) {
rc = CIL_FALSE;
goto exit;
if (ebitmap_is_empty(&map)) {
return CIL_FALSE;
}
rc = ebitmap_match_any(&map, a->types);
ebitmap_destroy(&map);
}
exit:
return rc;
}