Bug #70742 [Nab]: random_bytes() fails when the SYSTEMROOT env var is empty

Edit report at https://bugs.php.net/bug.php?id=70742&edit=1 ID: 70742 Updated by: ab@php.net Reported by: nicolas dot grekas+php at gmail dot com Summary: random_bytes() fails when the SYSTEMROOT env var is empty Status: Not a bug Type: Bug Package: mcrypt related Operating System: Windows PHP Version: 7.0.0RC5 Block user comment: N Private report: N New Comment: OK, I didn't think about it from this POV, but yes -proc_open() actually doesn't merge env. Btw. it'll be much easier in 7.1, getenv() without arguments will deliver the whole env vars (Ferenc already merged it). Thanks. Previous Comments: ------------------------------------------------------------------------ [2015-10-20 13:09:01] nicolas dot grekas+php at gmail dot com "Not a bug" is fine by me, I mostly wanted to get feedback on this behaviour and document it somewhere. This can happen more frequently by using proc_open(): when one sets the $env argument, it's easy to miss some important vars there. ------------------------------------------------------------------------ [2015-10-20 11:16:03] ab@php.net Thanks for the report. Why would you want to manipulate this env variable? Doing so, you'll probably break not only this but many other things. In this particular case, since the default crypto service provider is used, the corresponding DLL will fail to load. Consequently CryptAcquireContext() will fail. This is expected behavior. Thanks. ------------------------------------------------------------------------ [2015-10-19 14:56:06] nicolas dot grekas+php at gmail dot com Description: ------------ On Windows, both random_bytes and mcrypt_create_iv fail when the SYSTEMROOT env var is not set. Test script: --------------- <?php putenv('SYSTEMROOT='); echo strlen(random_bytes(1)); Expected result: ---------------- 1 Actual result: -------------- PHP Warning: mcrypt_create_iv(): Could not gather sufficient random data ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=70742&edit=1