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Diffstat (limited to 'Xext/xselinux_label.c')
-rw-r--r--Xext/xselinux_label.c173
1 files changed, 95 insertions, 78 deletions
diff --git a/Xext/xselinux_label.c b/Xext/xselinux_label.c
index 7ec10ff86..239536cf3 100644
--- a/Xext/xselinux_label.c
+++ b/Xext/xselinux_label.c
@@ -32,21 +32,60 @@ typedef struct {
SELinuxObjectRec sel;
} SELinuxAtomRec;
+/* dynamic array */
+typedef struct {
+ unsigned size;
+ void **array;
+} SELinuxArrayRec;
+
/* labeling handle */
static struct selabel_handle *label_hnd;
/* Array of object classes indexed by resource type */
-static security_class_t *knownTypes;
-static unsigned numKnownTypes;
-
+SELinuxArrayRec arr_types;
/* Array of event SIDs indexed by event type */
-static security_id_t *knownEvents;
-static unsigned numKnownEvents;
-
+SELinuxArrayRec arr_events;
/* Array of property and selection SID structures */
-static SELinuxAtomRec *knownAtoms;
-static unsigned numKnownAtoms;
+SELinuxArrayRec arr_atoms;
+
+/*
+ * Dynamic array helpers
+ */
+static void *
+SELinuxArrayGet(SELinuxArrayRec *rec, unsigned key)
+{
+ return (rec->size > key) ? rec->array[key] : 0;
+}
+
+static int
+SELinuxArraySet(SELinuxArrayRec *rec, unsigned key, void *val)
+{
+ if (key >= rec->size) {
+ /* Need to increase size of array */
+ rec->array = xrealloc(rec->array, (key + 1) * sizeof(val));
+ if (!rec->array)
+ return FALSE;
+ memset(rec->array + rec->size, 0, (key - rec->size + 1) * sizeof(val));
+ rec->size = key + 1;
+ }
+
+ rec->array[key] = val;
+ return TRUE;
+}
+static void
+SELinuxArrayFree(SELinuxArrayRec *rec, int free_elements)
+{
+ if (free_elements) {
+ unsigned i = rec->size;
+ while (i)
+ xfree(rec->array[--i]);
+ }
+
+ xfree(rec->array);
+ rec->size = 0;
+ rec->array = NULL;
+}
/*
* Looks up a name in the selection or property mappings
@@ -87,26 +126,23 @@ SELinuxAtomToSIDLookup(Atom atom, SELinuxObjectRec *obj, int map, int polymap)
int
SELinuxAtomToSID(Atom atom, int prop, SELinuxObjectRec **obj_rtn)
{
+ SELinuxAtomRec *rec;
SELinuxObjectRec *obj;
int rc, map, polymap;
- if (atom >= numKnownAtoms) {
- /* Need to increase size of atoms array */
- unsigned size = sizeof(SELinuxAtomRec);
- knownAtoms = xrealloc(knownAtoms, (atom + 1) * size);
- if (!knownAtoms)
+ rec = SELinuxArrayGet(&arr_atoms, atom);
+ if (!rec) {
+ rec = xcalloc(1, sizeof(SELinuxAtomRec));
+ if (!rec || !SELinuxArraySet(&arr_atoms, atom, rec))
return BadAlloc;
- memset(knownAtoms + numKnownAtoms, 0,
- (atom - numKnownAtoms + 1) * size);
- numKnownAtoms = atom + 1;
}
if (prop) {
- obj = &knownAtoms[atom].prp;
+ obj = &rec->prp;
map = SELABEL_X_PROP;
polymap = SELABEL_X_POLYPROP;
} else {
- obj = &knownAtoms[atom].sel;
+ obj = &rec->sel;
map = SELABEL_X_SELN;
polymap = SELABEL_X_POLYSELN;
}
@@ -218,36 +254,33 @@ SELinuxEventToSID(unsigned type, security_id_t sid_of_window,
SELinuxObjectRec *sid_return)
{
const char *name = LookupEventName(type);
+ security_id_t sid;
security_context_t ctx;
type &= 127;
- if (type >= numKnownEvents) {
- /* Need to increase size of classes array */
- unsigned size = sizeof(security_id_t);
- knownEvents = xrealloc(knownEvents, (type + 1) * size);
- if (!knownEvents)
- return BadAlloc;
- memset(knownEvents + numKnownEvents, 0,
- (type - numKnownEvents + 1) * size);
- numKnownEvents = type + 1;
- }
-
- if (!knownEvents[type]) {
+ sid = SELinuxArrayGet(&arr_events, type);
+ if (!sid) {
/* Look in the mappings of event names to contexts */
if (selabel_lookup_raw(label_hnd, &ctx, name, SELABEL_X_EVENT) < 0) {
ErrorF("SELinux: an event label lookup failed!\n");
return BadValue;
}
/* Get a SID for context */
- if (avc_context_to_sid_raw(ctx, knownEvents + type) < 0) {
+ if (avc_context_to_sid_raw(ctx, &sid) < 0) {
ErrorF("SELinux: a context_to_SID_raw call failed!\n");
+ freecon(ctx);
return BadAlloc;
}
freecon(ctx);
+ /* Cache the SID value */
+ if (!SELinuxArraySet(&arr_events, type, sid)) {
+ sidput(sid);
+ return BadAlloc;
+ }
}
/* Perform a transition to obtain the final SID */
- if (avc_compute_create(sid_of_window, knownEvents[type], SECCLASS_X_EVENT,
+ if (avc_compute_create(sid_of_window, sid, SECCLASS_X_EVENT,
&sid_return->sid) < 0) {
ErrorF("SELinux: a compute_create call failed!\n");
return BadValue;
@@ -282,44 +315,36 @@ SELinuxExtensionToSID(const char *name, security_id_t *sid_rtn)
security_class_t
SELinuxTypeToClass(RESTYPE type)
{
- RESTYPE fulltype = type;
- type &= TypeMask;
-
- if (type >= numKnownTypes) {
- /* Need to increase size of classes array */
- unsigned size = sizeof(security_class_t);
- knownTypes = xrealloc(knownTypes, (type + 1) * size);
- if (!knownTypes)
- return 0;
- memset(knownTypes + numKnownTypes, 0,
- (type - numKnownTypes + 1) * size);
- numKnownTypes = type + 1;
- }
+ void *tmp;
+
+ tmp = SELinuxArrayGet(&arr_types, type & TypeMask);
+ if (!tmp) {
+ unsigned long class = SECCLASS_X_RESOURCE;
+
+ if (type & RC_DRAWABLE)
+ class = SECCLASS_X_DRAWABLE;
+ else if (type == RT_GC)
+ class = SECCLASS_X_GC;
+ else if (type == RT_FONT)
+ class = SECCLASS_X_FONT;
+ else if (type == RT_CURSOR)
+ class = SECCLASS_X_CURSOR;
+ else if (type == RT_COLORMAP)
+ class = SECCLASS_X_COLORMAP;
+ else {
+ /* Need to do a string lookup */
+ const char *str = LookupResourceName(type);
+ if (!strcmp(str, "PICTURE"))
+ class = SECCLASS_X_DRAWABLE;
+ else if (!strcmp(str, "GLYPHSET"))
+ class = SECCLASS_X_FONT;
+ }
- if (!knownTypes[type]) {
- const char *str;
- knownTypes[type] = SECCLASS_X_RESOURCE;
-
- if (fulltype & RC_DRAWABLE)
- knownTypes[type] = SECCLASS_X_DRAWABLE;
- if (fulltype == RT_GC)
- knownTypes[type] = SECCLASS_X_GC;
- if (fulltype == RT_FONT)
- knownTypes[type] = SECCLASS_X_FONT;
- if (fulltype == RT_CURSOR)
- knownTypes[type] = SECCLASS_X_CURSOR;
- if (fulltype == RT_COLORMAP)
- knownTypes[type] = SECCLASS_X_COLORMAP;
-
- /* Need to do a string lookup */
- str = LookupResourceName(fulltype);
- if (!strcmp(str, "PICTURE"))
- knownTypes[type] = SECCLASS_X_DRAWABLE;
- if (!strcmp(str, "GLYPHSET"))
- knownTypes[type] = SECCLASS_X_FONT;
+ tmp = (void *)class;
+ SELinuxArraySet(&arr_types, type & TypeMask, tmp);
}
- return knownTypes[type];
+ return (security_class_t)(unsigned long)tmp;
}
security_context_t
@@ -350,15 +375,7 @@ SELinuxLabelReset(void)
label_hnd = NULL;
/* Free local state */
- xfree(knownAtoms);
- knownAtoms = NULL;
- numKnownAtoms = 0;
-
- xfree(knownEvents);
- knownEvents = NULL;
- numKnownEvents = 0;
-
- xfree(knownTypes);
- knownTypes = NULL;
- numKnownTypes = 0;
+ SELinuxArrayFree(&arr_types, 0);
+ SELinuxArrayFree(&arr_events, 0);
+ SELinuxArrayFree(&arr_atoms, 1);
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-25 12:16:33 +0000