1 files changed, 14 insertions, 1 deletions

diff --git a/src/lib/libcrypto/rand/randfile.c b/src/lib/libcrypto/rand/randfile.c
index 4a994bf73b..c3a0c12c58 100644
--- a/src/lib/libcrypto/rand/randfile.c
+++ b/src/lib/libcrypto/rand/randfile.c
@@ -142,7 +142,20 @@ int RAND_write_file(const char *file)
         int i,ret=0,err=0;
         FILE *out = NULL;
         int n;
-        
+        struct stat sb;
+
+        i=stat(file,&sb);
+        if (i != -1) { 
+          if (sb.st_mode & (S_IFBLK | S_IFCHR)) {
+            /* this file is a device. we don't write back to it. 
+             * we "succeed" on the assumption this is some sort 
+             * of random device. Otherwise attempting to write to 
+             * and chmod the device causes problems.
+             */
+            return(1); 
+          }
+        }
+
 #if defined(O_CREAT) && defined(O_EXCL) && !defined(WIN32)
         /* For some reason Win32 can't write to files created this way */