Git-Mirrors/monero
1
0
Fork 0
mirror of https://github.com/monero-project/monero.git synced 2024-10-01 11:49:47 -04:00
Code Issues Packages Projects Releases Wiki Activity

ringct: make rctSigBase serialization follow strict aliasing rule

Browse Source 
Accessing an object of type `char` thru an lvalue of type `crypto::hash8` is undefined behavior.
https://developers.redhat.com/blog/2020/06/03/the-joys-and-perils-of-aliasing-in-c-and-c-part-2
This commit is contained in:
jeffro256 2023-10-23 16:28:02 -05:00
parent 2656cdf505
commit eae62a07e0
No known key found for this signature in database
GPG Key ID: 6F79797A6E392442
1 changed files with 9 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
src/ringct/rctTypes.h
View File

@ -362,11 +362,17 @@ namespace rct {
{
if (type == RCTTypeBulletproof2 || type == RCTTypeCLSAG || type == RCTTypeBulletproofPlus)
{
// Since RCTTypeBulletproof2 enote types, we don't serialize the blinding factor, and only serialize the
// first 8 bytes of ecdhInfo[i].amount
ar.begin_object();
if (!typename Archive<W>::is_saving())
crypto::hash8 trunc_amount; // placeholder variable needed to maintain "strict aliasing"
if (!typename Archive<W>::is_saving()) // loading
memset(ecdhInfo[i].amount.bytes, 0, sizeof(ecdhInfo[i].amount.bytes));
crypto::hash8 &amount = (crypto::hash8&)ecdhInfo[i].amount;
FIELD(amount);
else // saving
memcpy(trunc_amount.data, ecdhInfo[i].amount.bytes, sizeof(trunc_amount));
FIELD(trunc_amount);
if (!typename Archive<W>::is_saving()) // loading
memcpy(ecdhInfo[i].amount.bytes, trunc_amount.data, sizeof(trunc_amount));
ar.end_object();
}
else