Differential D8290 Diff 24551 usr.sbin/bhyve/pci_virtio_rnd.c

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usr.sbin/bhyve/pci_virtio_rnd.c

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	* Randomness is sourced from /dev/random which does not block			* Randomness is sourced from /dev/random which does not block
	* once it has been seeded at bootup.			* once it has been seeded at bootup.
	*/			*/

	#include <sys/cdefs.h>			#include <sys/cdefs.h>
	__FBSDID("$FreeBSD$");			__FBSDID("$FreeBSD$");

	#include <sys/param.h>			#include <sys/param.h>
				#ifndef WITHOUT_CAPSICUM
				#include <sys/capsicum.h>
				#endif
	#include <sys/linker_set.h>			#include <sys/linker_set.h>
	#include <sys/uio.h>			#include <sys/uio.h>

				#include <err.h>
	#include <errno.h>			#include <errno.h>
	#include <fcntl.h>			#include <fcntl.h>
	#include <stdio.h>			#include <stdio.h>
	#include <stdlib.h>			#include <stdlib.h>
	#include <string.h>			#include <string.h>
	#include <unistd.h>			#include <unistd.h>
	#include <assert.h>			#include <assert.h>
	#include <pthread.h>			#include <pthread.h>
				#include <sysexits.h>

	#include "bhyverun.h"			#include "bhyverun.h"
	#include "pci_emul.h"			#include "pci_emul.h"
	#include "virtio.h"			#include "virtio.h"

	#define VTRND_RINGSZ 64			#define VTRND_RINGSZ 64


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	static int			static int
	pci_vtrnd_init(struct vmctx ctx, struct pci_devinst pi, char *opts)			pci_vtrnd_init(struct vmctx ctx, struct pci_devinst pi, char *opts)
	{			{
	struct pci_vtrnd_softc *sc;			struct pci_vtrnd_softc *sc;
	int fd;			int fd;
	int len;			int len;
	uint8_t v;			uint8_t v;
				#ifndef WITHOUT_CAPSICUM
				cap_rights_t rights;
				#endif

	/*			/*
	* Should always be able to open /dev/random.			* Should always be able to open /dev/random.
	*/			*/
	fd = open("/dev/random", O_RDONLY \| O_NONBLOCK);			fd = open("/dev/random", O_RDONLY \| O_NONBLOCK);

	assert(fd >= 0);			assert(fd >= 0);

				#ifndef WITHOUT_CAPSICUM
				cap_rights_init(&rights, CAP_EVENT, CAP_READ);
				grehanUnsubmitted Not Done Inline Actions CAP_EVENT can be removed (no mevent calls). grehan: CAP_EVENT can be removed (no mevent calls).
				if (cap_rights_limit(fd, &rights) == -1 && errno != ENOSYS)
				errx(EX_OSERR, "Unable to apply rights for sandbox");
				#endif

	/*			/*
	* Check that device is seeded and non-blocking.			* Check that device is seeded and non-blocking.
	*/			*/
	len = read(fd, &v, sizeof(v));			len = read(fd, &v, sizeof(v));
	if (len <= 0) {			if (len <= 0) {
	WPRINTF(("vtrnd: /dev/random not ready, read(): %d", len));			WPRINTF(("vtrnd: /dev/random not ready, read(): %d", len));
	return (1);			return (1);
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