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Put bounds on the number of CPUID leaves explored

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This commit is contained in:
Pieter Wuille 2019-11-20 10:54:08 -08:00
parent ba2c5fe147
commit f93fc61c65
1 changed files with 3 additions and 3 deletions
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6
src/randomenv.cpp
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@ -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);
}
}