X-Git-Url: https://git.distorted.org.uk/u/mdw/putty/blobdiff_plain/e3ac3c05a5af7f36eb895f457e3a627d75a1546b..88ea89339783ee587180b645981967f6cb8bcd20:/unix/uxnoise.c

diff --git a/unix/uxnoise.c b/unix/uxnoise.c
index b563f7cb..c42466f6 100644
--- a/unix/uxnoise.c
+++ b/unix/uxnoise.c
@@ -4,6 +4,9 @@
  */
 
 #include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+
 #include <fcntl.h>
 #include <unistd.h>
 #include <sys/time.h>
@@ -32,6 +35,8 @@ static int read_dev_urandom(char *buf, int len)
 	ngot += ret;
     }
 
+    close(fd);
+
     return 1;
 }
 
@@ -47,19 +52,34 @@ void noise_get_heavy(void (*func) (void *, int))
     char buf[512];
     FILE *fp;
     int ret;
+    int got_dev_urandom = 0;
 
-    if (read_dev_urandom(buf, 32))
+    if (read_dev_urandom(buf, 32)) {
+	got_dev_urandom = 1;
 	func(buf, 32);
+    }
 
     fp = popen("ps -axu 2>/dev/null", "r");
-    while ( (ret = fread(buf, 1, sizeof(buf), fp)) > 0)
-	func(buf, ret);
-    pclose(fp);
+    if (fp) {
+	while ( (ret = fread(buf, 1, sizeof(buf), fp)) > 0)
+	    func(buf, ret);
+	pclose(fp);
+    } else if (!got_dev_urandom) {
+	fprintf(stderr, "popen: %s\n"
+		"Unable to access fallback entropy source\n", strerror(errno));
+	exit(1);
+    }
 
     fp = popen("ls -al /tmp 2>/dev/null", "r");
-    while ( (ret = fread(buf, 1, sizeof(buf), fp)) > 0)
-	func(buf, ret);
-    pclose(fp);
+    if (fp) {
+	while ( (ret = fread(buf, 1, sizeof(buf), fp)) > 0)
+	    func(buf, ret);
+	pclose(fp);
+    } else if (!got_dev_urandom) {
+	fprintf(stderr, "popen: %s\n"
+		"Unable to access fallback entropy source\n", strerror(errno));
+	exit(1);
+    }
 
     read_random_seed(func);
     random_save_seed();