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do not try to access() /dev/urandom either if getrandom() works

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This commit is contained in:
Tomas Mraz 2017-12-05 11:54:01 +01:00
parent e16cfed1d6
commit ed535bbc52
2 changed files with 41 additions and 1 deletions
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37
libgcrypt-1.8.1-getrandom.patch
View File

@ -1,3 +1,40 @@
diff -up libgcrypt-1.8.1/random/random-csprng.c.getrandom libgcrypt-1.8.1/random/random-csprng.c
--- libgcrypt-1.8.1/random/random-csprng.c.getrandom 2017-08-27 09:05:36.000000000 +0200
+++ libgcrypt-1.8.1/random/random-csprng.c 2017-12-05 11:49:06.609801947 +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-1.8.1/random/rndlinux.c.getrandom libgcrypt-1.8.1/random/rndlinux.c
--- libgcrypt-1.8.1/random/rndlinux.c.getrandom 2017-09-05 14:34:28.003872675 +0200
+++ libgcrypt-1.8.1/random/rndlinux.c 2017-12-04 09:48:38.704845838 +0100

5
libgcrypt.spec
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@ -1,6 +1,6 @@
Name: libgcrypt
Version: 1.8.1
Release: 2%{?dist}
Release: 3%{?dist}
URL: http://www.gnupg.org/
Source0: libgcrypt-%{version}-hobbled.tar.xz
# The original libgcrypt sources now contain potentially patented ECC
@ -195,6 +195,9 @@ exit 0
%license COPYING
%changelog
* Tue Dec 5 2017 Tomáš Mráz <tmraz@redhat.com> 1.8.1-3
- do not try to access() /dev/urandom either if getrandom() works
* Mon Dec 4 2017 Tomáš Mráz <tmraz@redhat.com> 1.8.1-2
- do not try to open /dev/urandom if getrandom() works (#1380866)