linux-kernel - Re: [PATCH] um: seed rng using host OS rng

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Date:   Wed, 13 Jul 2022 11:53:03 +0200
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Johannes Berg <johannes@...solutions.net>
Cc:     linux-um@...ts.infradead.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH] um: seed rng using host OS rng

Hi Johannes,

Thanks for the review.

On Wed, Jul 13, 2022 at 09:05:03AM +0200, Johannes Berg wrote:
> On Wed, 2022-07-13 at 01:27 +0200, Jason A. Donenfeld wrote:
> > 
> > +++ b/arch/um/include/shared/os.h
> > @@ -11,6 +11,12 @@
> >  #include <irq_user.h>
> >  #include <longjmp.h>
> >  #include <mm_id.h>
> > +/* This is to get size_t */
> > +#ifndef __UM_HOST__
> > +#include <linux/types.h>
> > +#else
> > +#include <stddef.h>
> > +#endif
> >  
> >  #define CATCH_EINTR(expr) while ((errno = 0, ((expr) < 0)) && (errno == EINTR))
> >  
> > @@ -243,6 +249,7 @@ extern void stack_protections(unsigned long address);
> >  extern int raw(int fd);
> >  extern void setup_machinename(char *machine_out);
> >  extern void setup_hostinfo(char *buf, int len);
> > +extern ssize_t os_getrandom(void *buf, size_t len, unsigned int flags);
> 
> For me, this doesn't compile, and per the man-page on my system, ssize_t
> requires <sys/types.h>, not <stddef.h>?

What you say about types.h strikes me as true from how libc programming
usually works everywhere else. But I actually copy and pasted that
snippet, including the comment, from user.h. So I guess user.h doesn't
break because of something else. Anyway, I'll change it to sys/types.h
and send a v2.

Jason