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Merge "Revert "Update getentropy_linux.c from upstream.""

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Josh Gao 2016-09-02 08:41:15 +00:00 committed by Gerrit Code Review
commit 9f798246ba
1 changed files with 46 additions and 29 deletions
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75
libc/bionic/getentropy_linux.c
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@ -1,4 +1,4 @@
/* $OpenBSD: getentropy_linux.c,v 1.42 2016/04/19 20:20:24 tj Exp $ */
/* $OpenBSD: getentropy_linux.c,v 1.28 2014/07/20 03:24:10 deraadt 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://man.openbsd.org/getentropy.2
* http://www.openbsd.org/cgi-bin/man.cgi/OpenBSD-current/man2/getentropy.2
*/
#define _POSIX_C_SOURCE 199309L
@ -27,8 +27,8 @@
#include <sys/ioctl.h>
#include <sys/resource.h>
#include <sys/syscall.h>
#ifdef SYS__sysctl
#include <linux/sysctl.h>
#ifdef HAVE_SYS_SYSCTL_H
#include <sys/sysctl.h>
#endif
#include <sys/statvfs.h>
#include <sys/socket.h>
@ -51,8 +51,8 @@
#include <openssl/sha.h>
#endif
#include <linux/types.h>
#include <linux/random.h>
#include <linux/sysctl.h>
#ifdef HAVE_GETAUXVAL
#include <sys/auxv.h>
#endif
@ -76,7 +76,9 @@
int getentropy(void *buf, size_t len);
static int gotdata(char *buf, size_t len);
#ifdef SYS__getrandom
static int getentropy_getrandom(void *buf, size_t len);
#endif
static int getentropy_urandom(void *buf, size_t len);
#ifdef SYS__sysctl
static int getentropy_sysctl(void *buf, size_t len);
@ -93,17 +95,17 @@ getentropy(void *buf, size_t len)
if (len > 256) {
errno = EIO;
return (-1);
return -1;
}
#ifdef SYS__getrandom
/*
* Try descriptor-less getrandom()
*/
ret = getentropy_getrandom(buf, len);
if (ret != -1)
return (ret);
if (errno != ENOSYS)
return (-1);
#endif
/*
* Try to get entropy with /dev/urandom
@ -120,7 +122,7 @@ 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
* exhausted.
* exhuasted.
*
* However this can fail if the Linux kernel removes support
* for sysctl. Starting in 2007, there have been efforts to
@ -188,26 +190,39 @@ gotdata(char *buf, size_t len)
for (i = 0; i < len; ++i)
any_set |= buf[i];
if (any_set == 0)
return (-1);
return (0);
return -1;
return 0;
}
#ifdef SYS__getrandom
static int
getentropy_getrandom(void *buf, size_t len)
{
int pre_errno = errno;
int ret;
#if 0
/* Hand-definitions until the API becomes commonplace */
#ifndef SYS__getrandom
#ifdef __LP64__
#define SYS__getrandom 317
#else
#define SYS__getrandom 354
#endif
#endif
struct __getrandom_args args = {
.buf = buf;
.len = len;
.flags = 0;
};
if (len > 256)
return (-1);
do {
ret = syscall(SYS_getrandom, buf, len, 0);
} while (ret == -1 && errno == EINTR);
if ((size_t)ret != len)
return (-1);
errno = pre_errno;
return (0);
ret = syscall(SYS__getrandom, &args);
if (ret == len)
return (0);
#endif
return -1;
}
#endif
static int
getentropy_urandom(void *buf, size_t len)
@ -260,11 +275,11 @@ start:
close(fd);
if (gotdata(buf, len) == 0) {
errno = save_errno;
return (0); /* satisfied */
return 0; /* satisfied */
}
nodevrandom:
errno = EIO;
return (-1);
return -1;
}
#ifdef SYS__sysctl
@ -282,7 +297,7 @@ getentropy_sysctl(void *buf, size_t len)
struct __sysctl_args args = {
.name = mib,
.nlen = 3,
.oldval = (char *)buf + i,
.oldval = (char*) buf + i,
.oldlenp = &chunk,
};
if (syscall(SYS__sysctl, &args) != 0)
@ -295,12 +310,13 @@ getentropy_sysctl(void *buf, size_t len)
}
sysctlfailed:
errno = EIO;
return (-1);
return -1;
}
#endif /* SYS__sysctl */
#ifdef HAVE_OPENSSL
static const int cl[] = {
static int cl[] = {
CLOCK_REALTIME,
#ifdef CLOCK_MONOTONIC
CLOCK_MONOTONIC,
@ -331,7 +347,7 @@ getentropy_phdr(struct dl_phdr_info *info, size_t size, void *data)
SHA512_CTX *ctx = data;
SHA512_Update(ctx, &info->dlpi_addr, sizeof (info->dlpi_addr));
return (0);
return 0;
}
static int
@ -540,9 +556,10 @@ getentropy_fallback(void *buf, size_t len)
memset(results, 0, sizeof results);
if (gotdata(buf, len) == 0) {
errno = save_errno;
return (0); /* satisfied */
return 0; /* satisfied */
}
errno = EIO;
return (-1);
return -1;
}
#endif /* HAVE_OPENSSL */