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Update getentropy() code from OpenBSD

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Includes changes to handle the Linux syscall blocking when there is not
enough entropy during boot, by switching it to non-blocking mode and
falling back to the alternative implementations. Man page URL reference
fixes. Build fixes for Mac OS X.

Fixes: https://bugs.debian.org/898088
This commit is contained in:
Guillem Jover 2018-05-15 00:41:26 +02:00
parent 993828d84e
commit e42381dc51
7 changed files with 36 additions and 22 deletions
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4
src/getentropy_aix.c
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@ -1,4 +1,4 @@
/* $OpenBSD: getentropy_aix.c,v 1.3 2015/08/25 17:26:43 deraadt Exp $ */
/* $OpenBSD: getentropy_aix.c,v 1.5 2016/08/07 03:27:21 tb Exp $ */
/*
* Copyright (c) 2015 Michael Felt <aixtools@gmail.com>
@ -18,7 +18,7 @@
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Emulation of getentropy(2) as documented at:
* http://www.openbsd.org/cgi-bin/man.cgi/OpenBSD-current/man2/getentropy.2
* http://man.openbsd.org/getentropy.2
*/
/*
* -lperfstat is needed for the psuedo entropy data

4
src/getentropy_bsd.c
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@ -1,4 +1,4 @@
/* $OpenBSD: getentropy_freebsd.c,v 1.1 2014/11/03 06:23:30 bcook Exp $ */
/* $OpenBSD: getentropy_freebsd.c,v 1.3 2016/08/07 03:27:21 tb Exp $ */
/*
* Copyright (c) 2014 Pawel Jakub Dawidek <pjd@FreeBSD.org>
@ -17,7 +17,7 @@
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Emulation of getentropy(2) as documented at:
* http://www.openbsd.org/cgi-bin/man.cgi/OpenBSD-current/man2/getentropy.2
* http://man.openbsd.org/getentropy.2
*/
#include <sys/types.h>

2
src/getentropy_hpux.c
View File

@ -17,7 +17,7 @@
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Emulation of getentropy(2) as documented at:
* http://www.openbsd.org/cgi-bin/man.cgi/OpenBSD-current/man2/getentropy.2
* http://man.openbsd.org/getentropy.2
*/
#include <sys/types.h>

4
src/getentropy_hurd.c
View File

@ -17,7 +17,7 @@
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Emulation of getentropy(2) as documented at:
* http://www.openbsd.org/cgi-bin/man.cgi/OpenBSD-current/man2/getentropy.2
* http://man.openbsd.org/getentropy.2
*/
#define _POSIX_C_SOURCE 199309L
@ -110,7 +110,7 @@ getentropy(void *buf, size_t len)
* - Do the best under the circumstances....
*
* This code path exists to bring light to the issue that Hurd
* does not provide a failsafe API for entropy collection.
* still does not provide a failsafe API for entropy collection.
*
* We hope this demonstrates that Hurd should either get a
* sysctl ABI, or consider providing a new failsafe API which

25
src/getentropy_linux.c
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@ -1,4 +1,4 @@
/* $OpenBSD: getentropy_linux.c,v 1.40 2015/08/25 17:26:43 deraadt Exp $ */
/* $OpenBSD: getentropy_linux.c,v 1.45 2018/03/13 22:53:28 bcook Exp $ */
/*
* Copyright (c) 2014 Theo de Raadt <deraadt@openbsd.org>
@ -17,7 +17,7 @@
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Emulation of getentropy(2) as documented at:
* http://www.openbsd.org/cgi-bin/man.cgi/OpenBSD-current/man2/getentropy.2
* http://man.openbsd.org/getentropy.2
*/
#define _POSIX_C_SOURCE 199309L
@ -75,7 +75,7 @@
int getentropy(void *buf, size_t len);
static int gotdata(char *buf, size_t len);
#ifdef SYS_getrandom
#if defined(SYS_getrandom) && defined(GRND_NONBLOCK)
static int getentropy_getrandom(void *buf, size_t len);
#endif
static int getentropy_urandom(void *buf, size_t len);
@ -95,15 +95,18 @@ getentropy(void *buf, size_t len)
return (-1);
}
#ifdef SYS_getrandom
#if defined(SYS_getrandom) && defined(GRND_NONBLOCK)
/*
* Try descriptor-less getrandom()
* Try descriptor-less getrandom(), in non-blocking mode.
*
* The design of Linux getrandom is broken. It has an
* uninitialized phase coupled with blocking behaviour, which
* is unacceptable from within a library at boot time without
* possible recovery. See http://bugs.python.org/issue26839#msg267745
*/
ret = getentropy_getrandom(buf, len);
if (ret != -1)
return (ret);
if (errno != ENOSYS)
return (-1);
#endif
/*
@ -121,7 +124,7 @@ getentropy(void *buf, size_t len)
* Try to use sysctl CTL_KERN, KERN_RANDOM, RANDOM_UUID.
* sysctl is a failsafe API, so it guarantees a result. This
* should work inside a chroot, or when file descriptors are
* exhuasted.
* exhausted.
*
* However this can fail if the Linux kernel removes support
* for sysctl. Starting in 2007, there have been efforts to
@ -157,7 +160,7 @@ getentropy(void *buf, size_t len)
* - Do the best under the circumstances....
*
* This code path exists to bring light to the issue that Linux
* does not provide a failsafe API for entropy collection.
* still does not provide a failsafe API for entropy collection.
*
* We hope this demonstrates that Linux should either retain their
* sysctl ABI, or consider providing a new failsafe API which
@ -191,7 +194,7 @@ gotdata(char *buf, size_t len)
return (0);
}
#ifdef SYS_getrandom
#if defined(SYS_getrandom) && defined(GRND_NONBLOCK)
static int
getentropy_getrandom(void *buf, size_t len)
{
@ -200,7 +203,7 @@ getentropy_getrandom(void *buf, size_t len)
if (len > 256)
return (-1);
do {
ret = syscall(SYS_getrandom, buf, len, 0);
ret = syscall(SYS_getrandom, buf, len, GRND_NONBLOCK);
} while (ret == -1 && errno == EINTR);
if (ret != (int)len)

15
src/getentropy_osx.c
View File

@ -1,4 +1,4 @@
/* $OpenBSD: getentropy_osx.c,v 1.8 2014/07/21 20:19:47 guenther Exp $ */
/* $OpenBSD: getentropy_osx.c,v 1.11 2016/09/03 15:24:09 bcook Exp $ */
/*
* Copyright (c) 2014 Theo de Raadt <deraadt@openbsd.org>
@ -17,9 +17,10 @@
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Emulation of getentropy(2) as documented at:
* http://www.openbsd.org/cgi-bin/man.cgi/OpenBSD-current/man2/getentropy.2
* http://man.openbsd.org/getentropy.2
*/
#include <TargetConditionals.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/ioctl.h>
@ -45,14 +46,18 @@
#include <mach/mach_time.h>
#include <mach/mach_host.h>
#include <mach/host_info.h>
#if TARGET_OS_OSX
#include <sys/socketvar.h>
#include <sys/vmmeter.h>
#endif
#include <netinet/in.h>
#include <netinet/tcp.h>
#if TARGET_OS_OSX
#include <netinet/udp.h>
#include <netinet/ip_var.h>
#include <netinet/tcp_var.h>
#include <netinet/udp_var.h>
#endif
#include <CommonCrypto/CommonDigest.h>
#define SHA512_Update(a, b, c) (CC_SHA512_Update((a), (b), (c)))
#define SHA512_Init(xxx) (CC_SHA512_Init((xxx)))
@ -207,9 +212,11 @@ nodevrandom:
return (-1);
}
#if TARGET_OS_OSX
static int tcpmib[] = { CTL_NET, AF_INET, IPPROTO_TCP, TCPCTL_STATS };
static int udpmib[] = { CTL_NET, AF_INET, IPPROTO_UDP, UDPCTL_STATS };
static int ipmib[] = { CTL_NET, AF_INET, IPPROTO_IP, IPCTL_STATS };
#endif
static int kmib[] = { CTL_KERN, KERN_USRSTACK };
static int hwmib[] = { CTL_HW, HW_USERMEM };
@ -229,9 +236,11 @@ getentropy_fallback(void *buf, size_t len)
pid_t pid;
size_t i, ii, m;
char *p;
#if TARGET_OS_OSX
struct tcpstat tcpstat;
struct udpstat udpstat;
struct ipstat ipstat;
#endif
uint64_t mach_time;
unsigned int idata;
void *addr;
@ -266,6 +275,7 @@ getentropy_fallback(void *buf, size_t len)
HX(sysctl(hwmib, sizeof(hwmib) / sizeof(hwmib[0]),
&idata, &ii, NULL, 0) == -1, idata);
#if TARGET_OS_OSX
ii = sizeof(tcpstat);
HX(sysctl(tcpmib, sizeof(tcpmib) / sizeof(tcpmib[0]),
&tcpstat, &ii, NULL, 0) == -1, tcpstat);
@ -277,6 +287,7 @@ getentropy_fallback(void *buf, size_t len)
ii = sizeof(ipstat);
HX(sysctl(ipmib, sizeof(ipmib) / sizeof(ipmib[0]),
&ipstat, &ii, NULL, 0) == -1, ipstat);
#endif
HX((pid = getpid()) == -1, pid);
HX((pid = getsid(pid)) == -1, pid);

4
src/getentropy_solaris.c
View File

@ -1,4 +1,4 @@
/* $OpenBSD: getentropy_solaris.c,v 1.10 2015/08/25 17:26:43 deraadt Exp $ */
/* $OpenBSD: getentropy_solaris.c,v 1.12 2016/08/07 03:27:21 tb Exp $ */
/*
* Copyright (c) 2014 Theo de Raadt <deraadt@openbsd.org>
@ -17,7 +17,7 @@
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Emulation of getentropy(2) as documented at:
* http://www.openbsd.org/cgi-bin/man.cgi/OpenBSD-current/man2/getentropy.2
* http://man.openbsd.org/getentropy.2
*/
#include <sys/types.h>