libgcrypt/libgcrypt-1.8.4-getrandom.patch

Index: libgcrypt-1.9.1/random/random-csprng.c
===================================================================
--- libgcrypt-1.9.1.orig/random/random-csprng.c
+++ libgcrypt-1.9.1/random/random-csprng.c
@@ -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"
@@ -1202,6 +1206,22 @@ 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))
     {
Index: libgcrypt-1.9.1/random/random.c
===================================================================
--- libgcrypt-1.9.1.orig/random/random.c
+++ libgcrypt-1.9.1/random/random.c
@@ -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 (;;)
     {
Index: libgcrypt-1.9.1/random/rndlinux.c
===================================================================
--- libgcrypt-1.9.1.orig/random/rndlinux.c
+++ libgcrypt-1.9.1/random/rndlinux.c
@@ -39,6 +39,7 @@ extern int getentropy (void *buf, size_t
 #if defined(__linux__) || !defined(HAVE_GETENTROPY)
 #ifdef HAVE_SYSCALL
 # include <sys/syscall.h>
+# include <linux/random.h>
 # ifdef __NR_getrandom
 # define getentropy(buf,buflen) syscall (__NR_getrandom, buf, buflen, 0)
 # endif
@@ -155,12 +156,12 @@ _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;
@@ -176,12 +177,12 @@ _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;
@@ -230,6 +231,17 @@ _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;
         }
@@ -272,9 +284,7 @@ _gcry_rndlinux_gather_random (void (*add
               _gcry_post_syscall ();
             }
           while (ret == -1 && errno == EINTR);
-          if (ret == -1 && errno == ENOSYS)
-            ; /* getentropy is not supported - fallback to pulling from fd.  */
-          else
+          if (1)
             { /* getentropy is supported.  Some sanity checks.  */
               if (ret == -1)
                 log_fatal ("unexpected error from getentropy: %s\n",