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libselinux: make threadsafe for discover_class_cache #336

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libselinux: make threadsafe for discover_class_cache #336

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11 changes: 10 additions & 1 deletion libselinux/src/stringrep.c
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Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,8 @@

#define MAXVECTORS 8*sizeof(access_vector_t)

pthread_mutex_t cache_mutex = PTHREAD_MUTEX_INITIALIZER;

struct discover_class_node {
char *name;
security_class_t value;
Expand All @@ -31,19 +33,23 @@ static struct discover_class_node *discover_class_cache = NULL;

static struct discover_class_node * get_class_cache_entry_name(const char *s)
{
__pthread_mutex_lock(&cache_mutex);
struct discover_class_node *node = discover_class_cache;

for (; node != NULL && strcmp(s,node->name) != 0; node = node->next);

__pthread_mutex_unlock(&cache_mutex);
return node;
}

static struct discover_class_node * get_class_cache_entry_value(security_class_t c)
{
__pthread_mutex_lock(&cache_mutex);
struct discover_class_node *node = discover_class_cache;

for (; node != NULL && c != node->value; node = node->next);

__pthread_mutex_unlock(&cache_mutex);
return node;
}

Expand Down Expand Up @@ -140,9 +146,10 @@ static struct discover_class_node * discover_class(const char *s)
}
closedir(dir);

__pthread_mutex_lock(&cache_mutex);
node->next = discover_class_cache;
discover_class_cache = node;

__pthread_mutex_unlock(&cache_mutex);
return node;

err4:
Expand All @@ -160,6 +167,7 @@ static struct discover_class_node * discover_class(const char *s)

void selinux_flush_class_cache(void)
{
__pthread_mutex_lock(&cache_mutex);
struct discover_class_node *cur = discover_class_cache, *prev = NULL;
size_t i;

Expand All @@ -178,6 +186,7 @@ void selinux_flush_class_cache(void)
}

discover_class_cache = NULL;
__pthread_mutex_unlock(&cache_mutex);
}


Expand Down