Re: [libvirt] [PATCH for v4.6.0 0/2] Fix some random problems

And here's the fix for the viriscsitest on big-endian machine like Daniel suggested. Bjoern -- IBM Systems Linux on Z & Virtualization Development ------------------------------------------------------------------------ IBM Deutschland Research & Development GmbH Schönaicher Str. 220, 71032 Böblingen Phone: +49 7031 16 1819 ------------------------------------------------------------------------ Vorsitzende des Aufsichtsrats: Martina Koederitz Geschäftsführung: Dirk Wittkopp Sitz der Gesellschaft: Böblingen Registergericht: Amtsgericht Stuttgart, HRB 243294

From d59b254294a90c5a9ca0fb6ad29465cd0950bb61 Mon Sep 17 00:00:00 2001 From: Bjoern Walk <bwalk(a)linux.ibm.com&gt; Date: Wed, 1 Aug 2018 14:48:47 +0200 Subject: [PATCH] util: virrandom: make virRandomBits endian-safe Make the generation of random bits in virRandomBits independent of the endianness of the running architecture. This also solves problems with the mocked random byte generation on big-endian machines. Suggested-by: Daniel P. Berrangé <berrange(a)redhat.com&gt; Signed-off-by: Bjoern Walk <bwalk(a)linux.ibm.com&gt; --- src/util/virrandom.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/src/util/virrandom.c b/src/util/virrandom.c index 01cc82a0..a58ee97a 100644 --- a/src/util/virrandom.c +++ b/src/util/virrandom.c @@ -34,6 +34,7 @@ # include <gnutls/crypto.h> #endif +#include "virendian.h" #include "virrandom.h" #include "virthread.h" #include "count-one-bits.h" @@ -60,16 +61,15 @@ VIR_LOG_INIT("util.random"); */ uint64_t virRandomBits(int nbits) { - uint64_t ret = 0; + uint8_t ret[8]; - if (virRandomBytes((unsigned char *) &ret, sizeof(ret)) < 0) { + if (virRandomBytes(ret, sizeof(ret)) < 0) { /* You're already hosed, so this particular non-random value * isn't any worse. */ return 0; } - ret &= (1ULL << nbits) - 1; - return ret; + return virReadBufInt64LE(ret) & ((1ULL << nbits) - 1); }