File libgcrypt-1.6.1-fips-cfgrandom.patch of Package libgcrypt.12184
Index: libgcrypt-1.8.0/random/rndlinux.c
===================================================================
--- libgcrypt-1.8.0.orig/random/rndlinux.c 2017-07-21 17:45:39.193291437 +0200
+++ libgcrypt-1.8.0/random/rndlinux.c 2017-07-21 17:48:44.539152641 +0200
@@ -40,7 +40,9 @@
#include "g10lib.h"
#include "rand-internal.h"
-static int open_device (const char *name, int retry);
+#define NAME_OF_CFG_RNGSEED "/etc/gcrypt/rngseed"
+
+static int open_device (const char *name, int retry, int fatal);
static int
@@ -63,7 +65,7 @@ set_cloexec_flag (int fd)
* a fatal error but retries until it is able to reopen the device.
*/
static int
-open_device (const char *name, int retry)
+open_device (const char *name, int retry, int fatal)
{
int fd;
@@ -71,6 +73,8 @@ open_device (const char *name, int retry
_gcry_random_progress ("open_dev_random", 'X', 1, 0);
again:
fd = open (name, O_RDONLY);
+ if (fd == -1 && !fatal)
+ return fd;
if (fd == -1 && retry)
{
struct timeval tv;
@@ -115,6 +119,7 @@ _gcry_rndlinux_gather_random (void (*add
{
static int fd_urandom = -1;
static int fd_random = -1;
+ static int fd_configured = -1;
static int only_urandom = -1;
static unsigned char ever_opened;
int fd;
@@ -150,6 +155,11 @@ _gcry_rndlinux_gather_random (void (*add
close (fd_urandom);
fd_urandom = -1;
}
+ if (fd_configured != -1)
+ {
+ close (fd_configured);
+ fd_configured = -1;
+ }
return 0;
}
@@ -190,11 +200,21 @@ _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 (level == -1)
+ {
+ if (fd_configured == -1)
+ fd_configured = open_device ( NAME_OF_CFG_RNGSEED, 0, 0 );
+ fd = fd_configured;
+ if (fd == -1)
+ return -1;
+ }
+
if (level >= GCRY_VERY_STRONG_RANDOM && !only_urandom)
{
if (fd_random == -1)
{
- fd_random = open_device (NAME_OF_DEV_RANDOM, (ever_opened & 1));
+ fd_random = open_device (NAME_OF_DEV_RANDOM, (ever_opened & 1), 1);
ever_opened |= 1;
}
fd = fd_random;
@@ -203,7 +223,7 @@ _gcry_rndlinux_gather_random (void (*add
{
if (fd_urandom == -1)
{
- fd_urandom = open_device (NAME_OF_DEV_URANDOM, (ever_opened & 2));
+ fd_urandom = open_device (NAME_OF_DEV_URANDOM, (ever_opened & 2), 1);
ever_opened |= 2;
}
fd = fd_urandom;