[PATCH] um: seed rng using host OS rng

[Johannes Berg]

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>?

johannes