libgcrypt/libgcrypt-1.8.4-getrandom.patch

diff -up libgcrypt-1.8.4/random/random.c.getrandom libgcrypt-1.8.4/random/random.c
--- libgcrypt-1.8.4/random/random.c.getrandom	2017-11-23 19:16:58.000000000 +0100
+++ libgcrypt-1.8.4/random/random.c	2018-11-20 15:52:41.738708554 +0100
@@ -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-1.8.4/random/random-csprng.c.getrandom libgcrypt-1.8.4/random/random-csprng.c
--- libgcrypt-1.8.4/random/random-csprng.c.getrandom	2017-11-23 19:16:58.000000000 +0100
+++ libgcrypt-1.8.4/random/random-csprng.c	2018-11-20 15:52:41.738708554 +0100
@@ -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-1.8.4/random/rndlinux.c.getrandom libgcrypt-1.8.4/random/rndlinux.c
--- libgcrypt-1.8.4/random/rndlinux.c.getrandom	2018-11-20 15:52:41.731708393 +0100
+++ libgcrypt-1.8.4/random/rndlinux.c	2018-11-20 16:06:45.431207374 +0100
@@ -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"
@@ -147,12 +148,12 @@ _gcry_rndlinux_gather_random (void (*add
   if (!add)
     {
       /* Special mode to close the descriptors.  */
-      if (fd_random != -1)
+      if (fd_random >= 0)
         {
           close (fd_random);
           fd_random = -1;
         }
-      if (fd_urandom != -1)
+      if (fd_urandom >= 0)
         {
           close (fd_urandom);
           fd_urandom = -1;
@@ -166,12 +167,12 @@ _gcry_rndlinux_gather_random (void (*add
   apid = getpid ();
   if (my_pid != apid)
     {
-      if (fd_random != -1)
+      if (fd_random >= 0)
         {
           close (fd_random);
           fd_random = -1;
         }
-      if (fd_urandom != -1)
+      if (fd_urandom >= 0)
         {
           close (fd_urandom);
           fd_urandom = -1;
@@ -216,6 +217,22 @@ _gcry_rndlinux_gather_random (void (*add
      that we always require the device to be existent but want a more
      graceful behaviour if the rarely needed close operation has been
      used and the device needs to be re-opened later. */
+#if defined(__linux__) && defined(HAVE_SYSCALL) && defined(__NR_getrandom)
+   if (fd_urandom != -2)
+     {
+       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;
+           fd_random = -2;
+         }
+     }
+#endif
   if (level >= GCRY_VERY_STRONG_RANDOM && !only_urandom)
     {
       if (fd_random == -1)
@@ -255,6 +272,7 @@ _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 == -2)
         {
           long ret;
           size_t nbytes;
@@ -270,9 +288,7 @@ _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 pulling from fd.  */
-          else
+          if (1)
             { /* The syscall is supported.  Some sanity checks.  */
               if (ret == -1)
                 log_fatal ("unexpected error from getrandom: %s\n",