From: Theodore Ts'o Subject: Re: [PATCH, RFC] random: introduce getrandom(2) system call Date: Thu, 17 Jul 2014 16:54:17 -0400 Message-ID: <20140717205417.GT1491@thunk.org> References: <1405588695-12014-1-git-send-email-tytso@mit.edu> <20140717194812.GC24196@lenny.home.zabbo.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-crypto-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, beck-7YlrpqBBQ3VAfugRpC6u6w@public.gmane.org To: Zach Brown Return-path: Content-Disposition: inline In-Reply-To: <20140717194812.GC24196-fypN+1c5dIyjpB87vu3CluTW4wlIGRCZ@public.gmane.org> Sender: linux-api-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-crypto.vger.kernel.org On Thu, Jul 17, 2014 at 12:48:12PM -0700, Zach Brown wrote: > > > + return urandom_read(NULL, buf, count, NULL); > > I wonder if we want to refactor the entry points a bit more instead of > directly calling the device read functions. get_random_bytes() and > urandom_read() both have their own uninitialied use warning message and > tracing. Does the syscall want its own little extraction function as > well? I'm not sure what warning you are worried about? urandom_read() never uses file or ppos, so passing in NULL works just fine as near as I can tell. I could refactor the entropy point, but it probably wouldn't add any extra bloat, since the compiler would hopefully compile it away, but adding the extra static function would seem to make things less readable at least in my opinion. - Ted