os_unix: Seed random() for os_random()

While the users of os_random() do not really need strong pseudo random
numebrs, there is no significant harm in seeding random() with data from
os_get_random(), i.e., /dev/urandom, to get different sequence of not so
strong pseudo random values from os_random() for each time the process
is started.

Signed-off-by: Jouni Malinen <j@w1.fi>

src/utils/os_unix.c

@@ -337,6 +337,8 @@ char * os_rel2abs_path(const char *rel_path)
 
 int os_program_init(void)
 {
+	unsigned int seed;
+
 #ifdef ANDROID
 	/*
 	 * We ignore errors here since errors are normal if we
@@ -365,6 +367,9 @@ int os_program_init(void)
 	capset(&header, &cap);
 #endif /* ANDROID */
 
+	os_get_random((unsigned char *) &seed, sizeof(seed));
+	srandom(seed);
+
 	return 0;
 }