diff -up libgcrypt-1.8.3/random/random.c.getrandom libgcrypt-1.8.3/random/random.c
--- libgcrypt-1.8.3/random/random.c.getrandom 2017-11-23 19:16:58.000000000 +0100
+++ libgcrypt-1.8.3/random/random.c 2018-07-10 15:38:34.303855808 +0200
@@ -110,8 +110,8 @@ _gcry_random_read_conf (void)
unsigned int result = 0;
fp = fopen (fname, "r");
- if (!fp)
- return result;
+ if (!fp) /* We make only_urandom the default. */
+ return RANDOM_CONF_ONLY_URANDOM;
for (;;)
{
diff -up libgcrypt-1.8.3/random/random-csprng.c.getrandom libgcrypt-1.8.3/random/random-csprng.c
--- libgcrypt-1.8.3/random/random-csprng.c.getrandom 2017-11-23 19:16:58.000000000 +0100
+++ libgcrypt-1.8.3/random/random-csprng.c 2018-06-14 16:31:04.731179208 +0200
@@ -55,6 +55,10 @@
#ifdef __MINGW32__
#include <process.h>
#endif
+#if defined(__linux__) && defined(HAVE_SYSCALL)
+# include <sys/syscall.h>
+# include <linux/random.h>
+#endif
#include "g10lib.h"
#include "random.h"
#include "rand-internal.h"
@@ -1116,6 +1120,22 @@ getfnc_gather_random (void))(void (*)(co
enum random_origins, size_t, int);
#if USE_RNDLINUX
+#if defined(__linux__) && defined(HAVE_SYSCALL) && defined(__NR_getrandom)
+ long ret;
+ char buffer[1];
+
+ _gcry_pre_syscall ();
+ ret = syscall (__NR_getrandom,
+ (void*)buffer, (size_t)1, (unsigned int)GRND_NONBLOCK);
+ _gcry_post_syscall ();
+ if (ret != -1 || errno != ENOSYS)
+ {
+ fnc = _gcry_rndlinux_gather_random;
+ return fnc;
+ }
+ else
+ /* The syscall is not supported - fallback to /dev/urandom. */
+#endif
if ( !access (NAME_OF_DEV_RANDOM, R_OK)
&& !access (NAME_OF_DEV_URANDOM, R_OK))
{
diff -up libgcrypt-1.8.3/random/rndlinux.c.getrandom libgcrypt-1.8.3/random/rndlinux.c
--- libgcrypt-1.8.3/random/rndlinux.c.getrandom 2018-06-14 16:31:04.722178971 +0200
+++ libgcrypt-1.8.3/random/rndlinux.c 2018-07-10 15:55:03.301075155 +0200
@@ -35,6 +35,7 @@
#include <poll.h>
#if defined(__linux__) && defined(HAVE_SYSCALL)
# include <sys/syscall.h>
+# include <linux/random.h>
#endif
#include "types.h"
@@ -204,6 +205,18 @@ _gcry_rndlinux_gather_random (void (*add
{
if (fd_urandom == -1)
{
+#if defined(__linux__) && defined(HAVE_SYSCALL) && defined(__NR_getrandom)
+ long ret;
+
+ _gcry_pre_syscall ();
+ ret = syscall (__NR_getrandom,
+ (void*)buffer, (size_t)1, (unsigned int)GRND_NONBLOCK);
+ _gcry_post_syscall ();
+ if (ret > -1 || errno == EAGAIN || errno == EINTR)
+ fd_urandom = -2;
+ else
+ /* The syscall is not supported - fallback to /dev/urandom. */
+#endif
fd_urandom = open_device (NAME_OF_DEV_URANDOM, (ever_opened & 2));
ever_opened |= 2;
}
@@ -230,7 +243,7 @@ _gcry_rndlinux_gather_random (void (*add
* syscall and not a new device and thus we are not able to use
* select(2) to have a timeout. */
#if defined(__linux__) && defined(HAVE_SYSCALL) && defined(__NR_getrandom)
- if (fd == fd_urandom)
+ if (fd == -2)
{
long ret;
size_t nbytes;
@@ -246,9 +259,7 @@ _gcry_rndlinux_gather_random (void (*add
_gcry_post_syscall ();
}
while (ret == -1 && errno == EINTR);
- if (ret == -1 && errno == ENOSYS)
- ; /* The syscall is not supported - fallback to /dev/urandom. */
- else
+ if (1)
{ /* The syscall is supported. Some sanity checks. */
if (ret == -1)
log_fatal ("unexpected error from getrandom: %s\n",