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os: Don't require an on-stack buffer 

This allows urandom requests of even 100k bytes to succeed on a fresh
VM session on a Metro M4 express.
This commit is contained in:
Jeff Epler 2020-01-08 09:43:13 -06:00
parent 5baaac55ce
commit 6735283d8f
1 changed files with 4 additions and 3 deletions
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7
shared-bindings/os/__init__.c
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@ -33,6 +33,7 @@
#include "lib/oofatfs/diskio.h"
#include "py/mpstate.h"
#include "py/obj.h"
#include "py/objstr.h"
#include "py/runtime.h"
#include "shared-bindings/os/__init__.h"
@ -195,11 +196,11 @@ MP_DEFINE_CONST_FUN_OBJ_0(os_sync_obj, os_sync);
//|
STATIC mp_obj_t os_urandom(mp_obj_t size_in) {
mp_int_t size = mp_obj_get_int(size_in);
uint8_t tmp[size];
if (!common_hal_os_urandom(tmp, size)) {
mp_obj_str_t *result = MP_OBJ_TO_PTR(mp_obj_new_bytes_of_zeros(size));
if (!common_hal_os_urandom((uint8_t*) result->data, size)) {
mp_raise_NotImplementedError(translate("No hardware random available"));
}
return mp_obj_new_bytes(tmp, size);
return result;
}
MP_DEFINE_CONST_FUN_OBJ_1(os_urandom_obj, os_urandom);