Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/security/selinux/ss/mls.c b/security/selinux/ss/mls.c
index 39475fb..5e05f5b 100644
--- a/security/selinux/ss/mls.c
+++ b/security/selinux/ss/mls.c
@@ -218,9 +218,7 @@
/*
* Set the MLS fields in the security context structure
* `context' based on the string representation in
- * the string `*scontext'. Update `*scontext' to
- * point to the end of the string representation of
- * the MLS fields.
+ * the string `scontext'.
*
* This function modifies the string in place, inserting
* NULL characters to terminate the MLS fields.
@@ -235,21 +233,24 @@
*/
int mls_context_to_sid(struct policydb *pol,
char oldc,
- char **scontext,
+ char *scontext,
struct context *context,
struct sidtab *s,
u32 def_sid)
{
-
- char delim;
- char *scontextp, *p, *rngptr;
+ char *sensitivity, *cur_cat, *next_cat, *rngptr;
struct level_datum *levdatum;
struct cat_datum *catdatum, *rngdatum;
- int l, rc = -EINVAL;
+ int l, rc, i;
+ char *rangep[2];
if (!pol->mls_enabled) {
- if (def_sid != SECSID_NULL && oldc)
- *scontext += strlen(*scontext) + 1;
+ /*
+ * With no MLS, only return -EINVAL if there is a MLS field
+ * and it did not come from an xattr.
+ */
+ if (oldc && def_sid == SECSID_NULL)
+ return -EINVAL;
return 0;
}
@@ -261,113 +262,94 @@
struct context *defcon;
if (def_sid == SECSID_NULL)
- goto out;
+ return -EINVAL;
defcon = sidtab_search(s, def_sid);
if (!defcon)
- goto out;
+ return -EINVAL;
- rc = mls_context_cpy(context, defcon);
- goto out;
+ return mls_context_cpy(context, defcon);
}
- /* Extract low sensitivity. */
- scontextp = p = *scontext;
- while (*p && *p != ':' && *p != '-')
- p++;
+ /*
+ * If we're dealing with a range, figure out where the two parts
+ * of the range begin.
+ */
+ rangep[0] = scontext;
+ rangep[1] = strchr(scontext, '-');
+ if (rangep[1]) {
+ rangep[1][0] = '\0';
+ rangep[1]++;
+ }
- delim = *p;
- if (delim != '\0')
- *p++ = '\0';
-
+ /* For each part of the range: */
for (l = 0; l < 2; l++) {
- levdatum = hashtab_search(pol->p_levels.table, scontextp);
- if (!levdatum) {
- rc = -EINVAL;
- goto out;
- }
+ /* Split sensitivity and category set. */
+ sensitivity = rangep[l];
+ if (sensitivity == NULL)
+ break;
+ next_cat = strchr(sensitivity, ':');
+ if (next_cat)
+ *(next_cat++) = '\0';
+ /* Parse sensitivity. */
+ levdatum = hashtab_search(pol->p_levels.table, sensitivity);
+ if (!levdatum)
+ return -EINVAL;
context->range.level[l].sens = levdatum->level->sens;
- if (delim == ':') {
- /* Extract category set. */
- while (1) {
- scontextp = p;
- while (*p && *p != ',' && *p != '-')
- p++;
- delim = *p;
- if (delim != '\0')
- *p++ = '\0';
+ /* Extract category set. */
+ while (next_cat != NULL) {
+ cur_cat = next_cat;
+ next_cat = strchr(next_cat, ',');
+ if (next_cat != NULL)
+ *(next_cat++) = '\0';
- /* Separate into range if exists */
- rngptr = strchr(scontextp, '.');
- if (rngptr != NULL) {
- /* Remove '.' */
- *rngptr++ = '\0';
- }
+ /* Separate into range if exists */
+ rngptr = strchr(cur_cat, '.');
+ if (rngptr != NULL) {
+ /* Remove '.' */
+ *rngptr++ = '\0';
+ }
- catdatum = hashtab_search(pol->p_cats.table,
- scontextp);
- if (!catdatum) {
- rc = -EINVAL;
- goto out;
- }
+ catdatum = hashtab_search(pol->p_cats.table, cur_cat);
+ if (!catdatum)
+ return -EINVAL;
- rc = ebitmap_set_bit(&context->range.level[l].cat,
- catdatum->value - 1, 1);
+ rc = ebitmap_set_bit(&context->range.level[l].cat,
+ catdatum->value - 1, 1);
+ if (rc)
+ return rc;
+
+ /* If range, set all categories in range */
+ if (rngptr == NULL)
+ continue;
+
+ rngdatum = hashtab_search(pol->p_cats.table, rngptr);
+ if (!rngdatum)
+ return -EINVAL;
+
+ if (catdatum->value >= rngdatum->value)
+ return -EINVAL;
+
+ for (i = catdatum->value; i < rngdatum->value; i++) {
+ rc = ebitmap_set_bit(&context->range.level[l].cat, i, 1);
if (rc)
- goto out;
-
- /* If range, set all categories in range */
- if (rngptr) {
- int i;
-
- rngdatum = hashtab_search(pol->p_cats.table, rngptr);
- if (!rngdatum) {
- rc = -EINVAL;
- goto out;
- }
-
- if (catdatum->value >= rngdatum->value) {
- rc = -EINVAL;
- goto out;
- }
-
- for (i = catdatum->value; i < rngdatum->value; i++) {
- rc = ebitmap_set_bit(&context->range.level[l].cat, i, 1);
- if (rc)
- goto out;
- }
- }
-
- if (delim != ',')
- break;
+ return rc;
}
}
- if (delim == '-') {
- /* Extract high sensitivity. */
- scontextp = p;
- while (*p && *p != ':')
- p++;
-
- delim = *p;
- if (delim != '\0')
- *p++ = '\0';
- } else
- break;
}
- if (l == 0) {
+ /* If we didn't see a '-', the range start is also the range end. */
+ if (rangep[1] == NULL) {
context->range.level[1].sens = context->range.level[0].sens;
rc = ebitmap_cpy(&context->range.level[1].cat,
&context->range.level[0].cat);
if (rc)
- goto out;
+ return rc;
}
- *scontext = ++p;
- rc = 0;
-out:
- return rc;
+
+ return 0;
}
/*
@@ -379,21 +361,19 @@
int mls_from_string(struct policydb *p, char *str, struct context *context,
gfp_t gfp_mask)
{
- char *tmpstr, *freestr;
+ char *tmpstr;
int rc;
if (!p->mls_enabled)
return -EINVAL;
- /* we need freestr because mls_context_to_sid will change
- the value of tmpstr */
- tmpstr = freestr = kstrdup(str, gfp_mask);
+ tmpstr = kstrdup(str, gfp_mask);
if (!tmpstr) {
rc = -ENOMEM;
} else {
- rc = mls_context_to_sid(p, ':', &tmpstr, context,
+ rc = mls_context_to_sid(p, ':', tmpstr, context,
NULL, SECSID_NULL);
- kfree(freestr);
+ kfree(tmpstr);
}
return rc;
@@ -460,16 +440,17 @@
/*
* Convert the MLS fields in the security context
- * structure `c' from the values specified in the
- * policy `oldp' to the values specified in the policy `newp'.
+ * structure `oldc' from the values specified in the
+ * policy `oldp' to the values specified in the policy `newp',
+ * storing the resulting context in `newc'.
*/
int mls_convert_context(struct policydb *oldp,
struct policydb *newp,
- struct context *c)
+ struct context *oldc,
+ struct context *newc)
{
struct level_datum *levdatum;
struct cat_datum *catdatum;
- struct ebitmap bitmap;
struct ebitmap_node *node;
int l, i;
@@ -479,28 +460,25 @@
for (l = 0; l < 2; l++) {
levdatum = hashtab_search(newp->p_levels.table,
sym_name(oldp, SYM_LEVELS,
- c->range.level[l].sens - 1));
+ oldc->range.level[l].sens - 1));
if (!levdatum)
return -EINVAL;
- c->range.level[l].sens = levdatum->level->sens;
+ newc->range.level[l].sens = levdatum->level->sens;
- ebitmap_init(&bitmap);
- ebitmap_for_each_positive_bit(&c->range.level[l].cat, node, i) {
+ ebitmap_for_each_positive_bit(&oldc->range.level[l].cat,
+ node, i) {
int rc;
catdatum = hashtab_search(newp->p_cats.table,
sym_name(oldp, SYM_CATS, i));
if (!catdatum)
return -EINVAL;
- rc = ebitmap_set_bit(&bitmap, catdatum->value - 1, 1);
+ rc = ebitmap_set_bit(&newc->range.level[l].cat,
+ catdatum->value - 1, 1);
if (rc)
return rc;
-
- cond_resched();
}
- ebitmap_destroy(&c->range.level[l].cat);
- c->range.level[l].cat = bitmap;
}
return 0;