From f93fc61c65d605eae2d3e2c98bdd30ae587fcdab Mon Sep 17 00:00:00 2001 From: Pieter Wuille Date: Wed, 20 Nov 2019 10:54:08 -0800 Subject: [PATCH] Put bounds on the number of CPUID leaves explored --- src/randomenv.cpp | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/src/randomenv.cpp b/src/randomenv.cpp index 79f7bc93b..6992c720f 100644 --- a/src/randomenv.cpp +++ b/src/randomenv.cpp @@ -197,9 +197,9 @@ void AddAllCPUID(CSHA512& hasher) // Iterate over all standard leaves AddCPUID(hasher, 0, 0, ax, bx, cx, dx); // Returns max leaf in ax uint32_t max = ax; - for (uint32_t leaf = 1; leaf <= max; ++leaf) { + for (uint32_t leaf = 1; leaf <= max && leaf <= 0xFF; ++leaf) { uint32_t maxsub = 0; - for (uint32_t subleaf = 0;; ++subleaf) { + for (uint32_t subleaf = 0; subleaf <= 0xFF; ++subleaf) { AddCPUID(hasher, leaf, subleaf, ax, bx, cx, dx); // Iterate subleafs for leaf values 4, 7, 11, 13 if (leaf == 4) { @@ -220,7 +220,7 @@ void AddAllCPUID(CSHA512& hasher) // Iterate over all extended leaves AddCPUID(hasher, 0x80000000, 0, ax, bx, cx, dx); // Returns max extended leaf in ax uint32_t ext_max = ax; - for (uint32_t leaf = 0x80000001; leaf <= ext_max; ++leaf) { + for (uint32_t leaf = 0x80000001; leaf <= ext_max && leaf <= 0x800000FF; ++leaf) { AddCPUID(hasher, leaf, 0, ax, bx, cx, dx); } }