Submission Details
Severity:
Incorrect constant number used inside square root function for comparison.
Summary
sqrt function of MathMasters library uses incorrect constant value for comparison, which leads to wrong answer for certain cases.
Vulnerability Details
The vulnerability occurs due to the usage of wrong value for comparison.
At line 77, constant value 16777002 is used instead of 16777215.
Impact
Value of r calculated at line 77 will be incorrect for some test cases and will lead to wrong answer.
Tools Used
Manual Review
Recommendations
Change 16777002 to 16777215 at line 77.
-r := or(r, shl(4, lt(16777002, shr(r, x))))
+r := or(r, shl(4, lt(16777215, shr(r, x))))
Updates
Lead Judging Commences
inallhonesty over 1 year ago
Submission Judgement Published Assigned finding tags:
Sqrt yields incorrect results for certain inputs because 16777002 doesn't represent the maximum value resulting from a right shift
Rewards breakdown
nSLOC
46This contest has a flat reward structure with the following payouts:
100 EXP
20 EXP
2 EXP
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