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Implement getrandom(2) and getentropy(3)

Browse source 
The general idea here is to provide userspace programs with well-defined
sources of entropy, in a fashion that doesn't require opening a new file
descriptor (ulimits) or accessing paths (/dev/urandom may be restricted
by chroot or capsicum).

getrandom(2) is the more general API, and comes from the Linux world.
Since our urandom and random devices are identical, the GRND_RANDOM flag
is ignored.

getentropy(3) is added as a compatibility shim for the OpenBSD API.

truss(1) support is included.

Tests for both system calls are provided.  Coverage is believed to be at
least as comprehensive as LTP getrandom(2) test coverage.  Additionally,
instructions for running the LTP tests directly against FreeBSD are provided
in the "Test Plan" section of the Differential revision linked below.  (They
pass, of course.)

PR:		194204
Reported by:	David CARLIER <david.carlier AT hardenedbsd.org>
Discussed with:	cperciva, delphij, jhb, markj
Relnotes:	maybe
Differential Revision:	https://reviews.freebsd.org/D14500
This commit is contained in:
Conrad Meyer 2018-03-21 01:15:45 +00:00
parent 672756aa9f
commit e9ac27430c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=331279
18 changed files with 617 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

1
include/unistd.h
View file

@ -506,6 +506,7 @@ int execvP(const char *, const char *, char * const *);
int feature_present(const char *);
char *fflagstostr(u_long);
int getdomainname(char *, int);
int getentropy(void *, size_t);
int getgrouplist(const char *, gid_t, gid_t *, int *);
int getloginclass(char *, size_t);
mode_t getmode(const void *, mode_t);

2
lib/libc/gen/Makefile.inc
View file

@ -57,6 +57,7 @@ SRCS+= __getosreldate.c \
getcap.c \
getcwd.c \
getdomainname.c \
getentropy.c \
getgrent.c \
getgrouplist.c \
gethostname.c \
@ -220,6 +221,7 @@ MAN+= alarm.3 \
getcwd.3 \
getdiskbyname.3 \
getdomainname.3 \
getentropy.3 \
getfsent.3 \
getgrent.3 \
getgrouplist.3 \

1
lib/libc/gen/Symbol.map
View file

@ -408,6 +408,7 @@ FBSD_1.5 {
fts_set;
fts_set_clientptr;
ftw;
getentropy;
getmntinfo;
glob;
globfree;

86
lib/libc/gen/getentropy.3 Normal file
View file

@ -0,0 +1,86 @@
.\" $OpenBSD: getentropy.2,v 1.8 2015/01/31 00:20:12 schwarze Exp $
.\"
.\" Copyright (c) 2018 Conrad Meyer <cem@FreeBSD.org>
.\" Copyright (c) 2014 Theo de Raadt
.\"
.\" Permission to use, copy, modify, and distribute this software for any
.\" purpose with or without fee is hereby granted, provided that the above
.\" copyright notice and this permission notice appear in all copies.
.\"
.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.\"
.\" $FreeBSD$
.\"
.Dd February 24, 2018
.Dt GETENTROPY 3
.Os
.Sh NAME
.Nm getentropy
.Nd get entropy
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In unistd.h
.Ft int
.Fn getentropy "void *buf" "size_t buflen"
.Sh DESCRIPTION
.Fn getentropy
fills a buffer with high-quality random data.
.Pp
The maximum
.Fa buflen
permitted is 256 bytes.
.Pp
If it does not produce an error,
.Fn getentropy
always provides the requested number of bytes of random data.
.Pp
Similar to reading from
.Pa /dev/urandom
just after boot,
.Fn getentropy
may block until the system has collected enough entropy to seed the CSPRNG.
.Sh IMPLEMENTATION NOTES
The
.Fn getentropy
function is implemented using
.Xr getrandom 2 .
.Sh RETURN VALUES
.Rv -std
.Sh ERRORS
.Fn getentropy
will succeed unless:
.Bl -tag -width Er
.It Bq Er EFAULT
The
.Fa buf
parameter points to an
invalid address.
.It Bq Er EIO
Too many bytes requested, or some other fatal error occurred.
.El
.Sh SEE ALSO
.Xr arc4random 3 ,
.Xr getrandom 2 ,
.Xr random 4
.Sh STANDARDS
.Fn getentropy
is non-standard.
It is present on
.Ox
and Linux.
.Sh HISTORY
The
.Fn getentropy
function appeared in
.Ox 5.6 .
The
.Fx
libc compatibility shim first appeared in
.Fx 12.0 .

70
lib/libc/gen/getentropy.c Normal file
View file

@ -0,0 +1,70 @@
/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2018 Conrad Meyer <cem@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/random.h>
#include <errno.h>
#include <stdlib.h>
#include "libc_private.h"
int
getentropy(void *buf, size_t buflen)
{
ssize_t rd;
if (buflen > 256) {
errno = EIO;
return (-1);
}
while (buflen > 0) {
rd = getrandom(buf, buflen, 0);
if (rd == -1) {
if (errno == EINTR)
continue;
else if (errno == ENOSYS)
abort();
else
return (-1);
}
/* This cannot happen. */
if (rd == 0)
abort();
buf = (char *)buf + rd;
buflen -= rd;
}
return (0);
}

1
lib/libc/sys/Makefile.inc
View file

@ -197,6 +197,7 @@ MAN+= abort2.2 \
getpgrp.2 \
getpid.2 \
getpriority.2 \
getrandom.2 \
getrlimit.2 \
getrusage.2 \
getsid.2 \

3
lib/libc/sys/Symbol.map
View file

@ -392,6 +392,7 @@ FBSD_1.5 {
getdents;
getdirentries;
getfsstat;
getrandom;
kevent;
lstat;
mknod;
@ -627,6 +628,8 @@ FBSDprivate_1.0 {
__sys_getppid;
_getpriority;
__sys_getpriority;
_getrandom;
__sys_getrandom;
_getresgid;
__sys_getresgid;
_getresuid;

121
lib/libc/sys/getrandom.2 Normal file
View file

@ -0,0 +1,121 @@
.\" Copyright (c) 2018 Conrad Meyer <cem@FreeBSD.org>
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" $FreeBSD$
.\"
.Dd February 24, 2018
.Dt GETRANDOM 2
.Os
.Sh NAME
.Nm getrandom
.Nd get random data
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In sys/random.h
.Ft ssize_t
.Fn getrandom "void *buf" "size_t buflen" "unsigned int flags"
.Sh DESCRIPTION
.Fn getrandom
fills
.Fa buf
with up to
.Fa buflen
bytes of random data.
.Pp
The
.Fa flags
argument may include zero or more of the following:
.Bl -tag -width _GRND_NONBLOCK_
.It Ql GRND_NONBLOCK
Return
.Er EAGAIN
instead of blocking, if the
.Xr random 4
device has not yet been seeded.
By default,
.Fn getrandom
will block until the device is seeded.
.It Ql GRND_RANDOM
This flag does nothing on
.Fx .
.Pa /dev/random
and
.Pa /dev/urandom
are identical.
.El
.Pp
If the
.Xr random 4
device has been seeded, reads of up to 256 bytes will always return as many
bytes as requested and will not be interrupted by signals.
.Pp
.Sh RETURN VALUES
Upon successful completion, the number of bytes which were actually read is
returned.
For requests larger than 256 bytes, this can be fewer bytes than were
requested.
Otherwise, -1 is returned and the global variable
.Va errno
is set to indicate the error.
.Sh ERRORS
The
.Fn getrandom
operation returns the following errors:
.Bl -tag -width Er
.It Bq Er EAGAIN
The
.Ql GRND_NONBLOCK
flag was set and the
.Xr random 4
device was not yet seeded.
.It Bq Er EFAULT
The
.Fa buf
parameter points to an invalid address.
.It Bq Er EINTR
The sleep was interrupted by a signal.
.It Bq Er EINVAL
An invalid
.Fa flags
was specified.
.It Bq Er EINVAL
The requested
.Fa buflen
was larger than
.Dv IOSIZE_MAX .
.El
.Sh SEE ALSO
.Xr arc4random 3 ,
.Xr getentropy 3 ,
.Xr random 4
.Sh STANDARDS
.Fn getentropy
is non-standard.
It is present in Linux.
.Sh HISTORY
The
.Fn getrandom
system call first appeared in
.Fx 12.0 .

3
lib/libc/tests/gen/Makefile
View file

@ -10,6 +10,7 @@ ATF_TESTS_C+= fmtmsg_test
ATF_TESTS_C+= fnmatch2_test
ATF_TESTS_C+= fpclassify2_test
ATF_TESTS_C+= ftw_test
ATF_TESTS_C+= getentropy_test
ATF_TESTS_C+= getmntinfo_test
ATF_TESTS_C+= glob2_test
ATF_TESTS_C+= makecontext_test
@ -61,6 +62,8 @@ NETBSD_ATF_TESTS_C+= vis_test
.include "../Makefile.netbsd-tests"
CFLAGS.getentropy_test+= -I${SRCTOP}/include
LIBADD.getentropy_test+= c
LIBADD.humanize_number_test+= util
LIBADD.fpclassify_test+=m

84
lib/libc/tests/gen/getentropy_test.c Normal file
View file

@ -0,0 +1,84 @@
/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2018 Conrad Meyer <cem@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <errno.h>
#include <unistd.h>
#include <atf-c.h>
ATF_TC_WITHOUT_HEAD(getentropy_count);
ATF_TC_BODY(getentropy_count, tc)
{
char buf[2];
int ret;
/* getentropy(2) does not modify buf past the requested length */
buf[1] = 0x7C;
ret = getentropy(buf, 1);
ATF_REQUIRE_EQ(ret, 0);
ATF_REQUIRE_EQ(buf[1], 0x7C);
}
ATF_TC_WITHOUT_HEAD(getentropy_fault);
ATF_TC_BODY(getentropy_fault, tc)
{
int ret;
ret = getentropy(NULL, 1);
ATF_REQUIRE_EQ(ret, -1);
ATF_REQUIRE_EQ(errno, EFAULT);
}
ATF_TC_WITHOUT_HEAD(getentropy_sizes);
ATF_TC_BODY(getentropy_sizes, tc)
{
char buf[512];
ATF_REQUIRE_EQ(getentropy(buf, sizeof(buf)), -1);
ATF_REQUIRE_EQ(errno, EIO);
ATF_REQUIRE_EQ(getentropy(buf, 257), -1);
ATF_REQUIRE_EQ(errno, EIO);
/* Smaller sizes always succeed: */
ATF_REQUIRE_EQ(getentropy(buf, 256), 0);
ATF_REQUIRE_EQ(getentropy(buf, 128), 0);
ATF_REQUIRE_EQ(getentropy(buf, 0), 0);
}
ATF_TP_ADD_TCS(tp)
{
ATF_TP_ADD_TC(tp, getentropy_count);
ATF_TP_ADD_TC(tp, getentropy_fault);
ATF_TP_ADD_TC(tp, getentropy_sizes);
return (atf_no_error());
}

2
sys/compat/freebsd32/syscalls.master
View file

@ -1116,5 +1116,7 @@
cpuwhich_t which, uint32_t id1, uint32_t id2, \
size_t domainsetsize, domainset_t *mask, \
int policy); }
563 AUE_NULL NOPROTO { int getrandom(void *buf, size_t buflen, \
unsigned int flags); }
; vim: syntax=off

1
sys/conf/files
View file

@ -3895,6 +3895,7 @@ kern/subr_vmem.c standard
kern/subr_witness.c optional witness
kern/sys_capability.c standard
kern/sys_generic.c standard
kern/sys_getrandom.c standard
kern/sys_pipe.c standard
kern/sys_procdesc.c standard
kern/sys_process.c standard

97
sys/kern/sys_getrandom.c Normal file
View file

@ -0,0 +1,97 @@
/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2018 Conrad Meyer <cem@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_compat.h"
#include <sys/param.h>
#include <sys/errno.h>
#include <sys/proc.h>
#include <sys/random.h>
#include <sys/sysproto.h>
#include <sys/systm.h>
#include <sys/uio.h>
#define GRND_VALIDFLAGS (GRND_NONBLOCK | GRND_RANDOM)
/*
* random_read_uio(9) returns EWOULDBLOCK if a nonblocking request would block,
* but the Linux API name is EAGAIN. On FreeBSD, they have the same numeric
* value for now.
*/
CTASSERT(EWOULDBLOCK == EAGAIN);
static int
kern_getrandom(struct thread *td, void *user_buf, size_t buflen,
unsigned int flags)
{
struct uio auio;
struct iovec aiov;
int error;
if ((flags & ~GRND_VALIDFLAGS) != 0)
return (EINVAL);
if (buflen > IOSIZE_MAX)
return (EINVAL);
if (buflen == 0) {
td->td_retval[0] = 0;
return (0);
}
aiov.iov_base = user_buf;
aiov.iov_len = buflen;
auio.uio_iov = &aiov;
auio.uio_iovcnt = 1;
auio.uio_offset = 0;
auio.uio_resid = buflen;
auio.uio_segflg = UIO_USERSPACE;
auio.uio_rw = UIO_READ;
auio.uio_td = td;
error = read_random_uio(&auio, (flags & GRND_NONBLOCK) != 0);
if (error == 0)
td->td_retval[0] = buflen - auio.uio_resid;
return (error);
}
#ifndef _SYS_SYSPROTO_H_
struct getrandom_args {
void *buf;
size_t buflen;
unsigned int flags;
};
#endif
int
sys_getrandom(struct thread *td, struct getrandom_args *uap)
{
return (kern_getrandom(td, uap->buf, uap->buflen, uap->flags));
}

2
sys/kern/syscalls.master
View file

@ -1021,6 +1021,8 @@
cpuwhich_t which, id_t id, \
size_t domainsetsize, domainset_t *mask, \
int policy); }
563 AUE_NULL STD { int getrandom(void *buf, size_t buflen, \
unsigned int flags); }
; Please copy any additions and changes to the following compatability tables:
; sys/compat/freebsd32/syscalls.master

8
sys/sys/random.h
View file

@ -31,10 +31,10 @@
#ifndef _SYS_RANDOM_H_
#define _SYS_RANDOM_H_
#ifdef _KERNEL
#include <sys/types.h>
#ifdef _KERNEL
#if !defined(KLD_MODULE)
#if defined(RANDOM_LOADABLE) && defined(RANDOM_YARROW)
#error "Cannot define both RANDOM_LOADABLE and RANDOM_YARROW"
@ -127,4 +127,8 @@ void random_harvest_deregister_source(enum random_entropy_source);
#endif /* _KERNEL */
#define GRND_NONBLOCK 0x1
#define GRND_RANDOM 0x2
ssize_t getrandom(void *buf, size_t buflen, unsigned int flags);
#endif /* _SYS_RANDOM_H_ */

5
tests/sys/kern/Makefile
View file

@ -11,6 +11,7 @@ ATF_TESTS_C+= ptrace_test
TEST_METADATA.ptrace_test+= timeout="15"
ATF_TESTS_C+= reaper
PLAIN_TESTS_C+= subr_unit_test
ATF_TESTS_C+= sys_getrandom
ATF_TESTS_C+= unix_seqpacket_test
ATF_TESTS_C+= unix_passfd_test
TEST_METADATA.unix_seqpacket_test+= timeout="15"
@ -21,6 +22,10 @@ ATF_TESTS_SH+= coredump_phnum_test
BINDIR= ${TESTSDIR}
PROGS+= coredump_phnum_helper
CFLAGS.sys_getrandom+= -I${SRCTOP}/sys/contrib/zstd/lib
LIBADD.sys_getrandom+= zstd
LIBADD.sys_getrandom+= c
LIBADD.sys_getrandom+= pthread
LIBADD.ptrace_test+= pthread
LIBADD.unix_seqpacket_test+= pthread

130
tests/sys/kern/sys_getrandom.c Normal file
View file

@ -0,0 +1,130 @@
/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2018 Conrad Meyer <cem@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/random.h>
#include <errno.h>
#include <atf-c.h>
#include <zstd.h>
const static unsigned valid_flags[] = { 0, GRND_NONBLOCK, GRND_RANDOM,
GRND_NONBLOCK | GRND_RANDOM };
ATF_TC_WITHOUT_HEAD(getrandom_randomness);
ATF_TC_BODY(getrandom_randomness, tc)
{
char randomb[4096], compressed[5000];
ssize_t ret;
size_t i, j, c;
unsigned mode;
for (i = 0; i < nitems(valid_flags); i++) {
mode = valid_flags[i];
/* Get new random data, filling randomb. */
memset(randomb, 0, sizeof(randomb));
for (j = 0; j < sizeof(randomb);) {
ret = getrandom(&randomb[j], sizeof(randomb) - j, mode);
if (ret < 0 && (mode & GRND_NONBLOCK) != 0 &&
errno == EAGAIN)
continue;
ATF_REQUIRE_MSG(ret >= 0, "other error: %d", errno);
ATF_REQUIRE_MSG(ret > 0, "bogus zero return");
j += (size_t)ret;
}
/* Perform compressibility test */
c = ZSTD_compress(compressed, sizeof(compressed), randomb,
sizeof(randomb), ZSTD_maxCLevel());
ATF_REQUIRE_MSG(!ZSTD_isError(c), "zstd compress: %s",
ZSTD_getErrorName(c));
/*
* If the output is very compressible, it's probably not random
*/
ATF_REQUIRE_MSG(c > (sizeof(randomb) * 4 / 5),
"purportedly random data was compressible: %zu/%zu or %f%%",
c, sizeof(randomb), (double)c / (double)sizeof(randomb));
}
}
ATF_TC_WITHOUT_HEAD(getrandom_fault);
ATF_TC_BODY(getrandom_fault, tc)
{
ssize_t ret;
ret = getrandom(NULL, 1, 0);
ATF_REQUIRE_EQ(ret, -1);
ATF_REQUIRE_EQ(errno, EFAULT);
}
ATF_TC_WITHOUT_HEAD(getrandom_count);
ATF_TC_BODY(getrandom_count, tc)
{
char buf[4096], reference[4096];
ssize_t ret;
/* getrandom(2) does not modify buf past the requested length */
_Static_assert(sizeof(reference) == sizeof(buf), "must match");
memset(reference, 0x7C, sizeof(reference));
memset(buf, 0x7C, sizeof(buf));
ret = getrandom(buf, 1, 0);
ATF_REQUIRE_EQ(ret, 1);
ATF_REQUIRE_EQ(memcmp(&buf[1], reference, sizeof(reference) - 1), 0);
memset(buf, 0x7C, sizeof(buf));
ATF_REQUIRE_EQ(getrandom(buf, 15, 0), 15);
ATF_REQUIRE_EQ(memcmp(&buf[15], reference, sizeof(reference) - 15), 0);
memset(buf, 0x7C, sizeof(buf));
ATF_REQUIRE_EQ(getrandom(buf, 255, 0), 255);
ATF_REQUIRE_EQ(memcmp(&buf[255], reference, sizeof(reference) - 255), 0);
memset(buf, 0x7C, sizeof(buf));
ATF_REQUIRE_EQ(getrandom(buf, 4095, 0), 4095);
ATF_REQUIRE_EQ(memcmp(&buf[4095], reference, sizeof(reference) - 4095), 0);
}
ATF_TP_ADD_TCS(tp)
{
ATF_TP_ADD_TC(tp, getrandom_count);
ATF_TP_ADD_TC(tp, getrandom_fault);
ATF_TP_ADD_TC(tp, getrandom_randomness);
return (atf_no_error());
}

2
usr.bin/truss/syscalls.c
View file

@ -259,6 +259,8 @@ static struct syscall decoded_syscalls[] = {
.args = { { Int, 0 } } },
{ .name = "getpriority", .ret_type = 1, .nargs = 2,
.args = { { Priowhich, 0 }, { Int, 1 } } },
{ .name = "getrandom", .ret_type = 1, .nargs = 3,
.args = { { BinString | OUT, 0 }, { Sizet, 1 }, { UInt, 2 } } },
{ .name = "getrlimit", .ret_type = 1, .nargs = 2,
.args = { { Resource, 0 }, { Rlimit | OUT, 1 } } },
{ .name = "getrusage", .ret_type = 1, .nargs = 2,